Prof Steve Johnson

Contact Details


Tel: +27 (0) 33 260 5148

Fax: +27 (0) 33 260 5105

e-mail: johnsonsd@ukzn.ac.za

 
 



Teaching

Biol 304 (Evolution and Systematics)
Biol 325 (Behaviour and reproductive ecology)
Biol 390 (Research Project)
Biol 733 Plant Breeding Systems
Biol 732 Topics in Evolutionary Biology


Research Interests

The ecology of plant-pollinator interactions. Formation of pollination ecotypes. Pollinator-driven speciation in plants. Plant breeding systems and ecological determinants of fruit and seed set. Floral mimicry in orchids and milkweeds. Coevolution of flowers and insects. Interpretation of trait evolution using phylogenetic analysis. Convergent evolution in plants with specialized pollination systems. Chemical ecology of pollination systems. Breakdown of plant-insect mutualisms in degraded landscapes. Reproductive systems of invasive plants


 

Publications

Online profiles of my publications:

Google scholar, click here

ISI-listed publications at ResearcherID, click here

 Last updated January 2014 


Peer-reviewed publications (scientific journal articles, book chapters, and books)


2013
  1. Martos F., Johnson, S. D., Peter, C. I. & Bytebier, B. 2013. A molecular phylogeny reveals paraphyly of the large genus Eulophia (Orchidaceae): a case for the reinstatement of Orthochilus. TAXON (in press).


  2. Kiepiel, I & Johnson, S. D. 2013. Shift from bird to butterfly pollination in Clivia (Amaryllidaceae). AMERICAN JOURNAL OF BOTANY (in press).


  3. Kiepiel, I & Johnson, S. D. 2013. Breeding systems in Clivia (Amaryllidaceae): late-acting self-incompatibility and its functional consequences. BOTANICAL JOURNAL OF THE LINNEAN SOCIETY (in press).


  4. Jürgens, A. Suk-Ling, W. Shuttleworth, A. & Johnson, S. D. 2013. Chemical mimicry of insect oviposition sites: a global analysis of convergence in angiosperms. ECOLOGY LETTERS 16: 1157-1167.


  5. van der Niet, T. Peakall, R. & Johnson, S. D. 2013. Pollinator-driven ecological speciation in plants: new evidence and future perspectives. ANNALS OF BOTANY (in press).


  6. Welsford, M. R., Midgley, J. J. & Johnson, S. D. 2013. Experimental evaluation of insect versus wind pollination in Leucadendron (Proteaceae). INTERNATIONAL JOURNAL OF PLANT SCIENCES (in press).


  7. Johnson, S. D. 2013. Pollination of South African orchids in the context of ecological guilds and evolutionary syndromes. In Bernhardt, P. & Meier, R. (eds). Darwin’s Orchids: Then and Now. Chicago University Press (in press).


  8. Hobbhahn, N. Johnson. S. D. Bytebier, B., Yeung, E. C. & Harder, L. D. 2013. The evolution of floral nectaries in Disa (Orchidaceae: Disinae): recapitulation or diversifying innovation? ANNALS OF BOTANY 112: 1303-1319.


  9. van der Niet T., Pirie M. D., Shuttleworth A., & Johnson SD, Midgley JJ. 2013. Do pollinator distributions underlie the evolution of pollination ecotypes in the Cape shrub Erica plukenetii? ANNALS OF BOTANY (in press).


  10. Johnson, S. D., Hobbhahn, N. & Bytebier, B. 2013. Ancestral deceit and labile evolution of nectar production in the African orchid genus Disa. BIOLOGY LETTERS 9: 20130500.


  11. Peter, C. & Johnson, S. D. 2013. Generalized food-deception: colour signals and efficient pollen transfer in bee-pollinated species of Eulophia (Orchidaceae). BOTANICAL JOURNAL OF THE LINNEAN SOCIETY 171: 713-729.


  12. Suinyuy, T. N., Donaldson, J. S. & Johnson, S. D. 2013. Patterns of odour emission, thermogenesis and pollinator activity in cones of an African cycad: what mechanisms apply? ANNALS OF BOTANY 112: 891-902.


  13. Martins, D. J. & Johnson, S. D. 2013. Interactions between hawkmoths and flowering plants in East Africa: polyphagy and evolutionary specialisation in an ecological context. BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY 110: 199-213.


  14. Peter, C. & Johnson, S. D. 2013. A pollinator shift explains floral divergence in an orchid species complex in South Africa. ANNALS OF BOTANY (in press).


  15. Duffy, K., Patrick, K. & Johnson, S. D. 2013. Does the likelihood of an Allee effect on plant fecundity depend on the type of pollinator? JOURNAL OF ECOLOGY 101: 953-962.


  16. Rodger, J., van Kleunen, M., & Johnson, S. D. 2013. Pollinators, mates and Allee effects: the importance of self-pollination for fecundity in an invasive lily. FUNCTIONAL ECOLOGY 27: 1023-1033.


  17. Schiestl, F. P. & Johnson, S. D. 2013. Pollinator-mediated evolution of floral signals. TRENDS IN ECOLOGY AND EVOLUTION 28: 307-315.


  18. Steenhuisen, S-L., Jürgens, A. & Johnson, S. D. 2013. Effects of volatile compounds emitted by Protea species (Proteaceae) on antennal electrophysiological responses and attraction of cetoniine beetles. JOURNAL OF CHEMICAL ECOLOGY 39: 438-446.


  19. Duffy, K., Patrick, K. & Johnson, S. D. 2013. Emasculation increases seed set in the bird-pollinated hermaphrodite Kniphofia linearifolia (Xanthorrhoeaceae): evidence for sexual conflict? AMERICAN JOURNAL OF BOTANY 100: 622-627.


  20. Ward, M. & Johnson, S. D. 2013. Generalised pollination systems for three invasive milkweeds in Australia? PLANT BIOLOGY 15: 566-572.


  21. Ward, M., Johnson, S. D. & Zalucki, M. P. 2013. When bigger is not better: intraspecific competition for pollination increases with population size in invasive milkweeds. OECOLOGIA 171: 883-891.


  22. Neuschulz, E.L., Grass, I. Botzat, A., Johnson, S. D. & Farwig, F. 2013. Persistance of flower visitors and pollination services of a generalist tree in modified forests. AUSTRAL ECOLOGY 38: 374-382.


  23. Suinyuy, T. N., Donaldson, J. S. & Johnson, S. D. 2013.Variation in the chemical composition of cone volatiles within the African cycad genus Encephalartos. PHYTOCHEMISTRY 85: 82-91.


2012
  1. Jersáková, J Jürgens, A., Šmilauer, P. & Johnson, S. D. 2012. The evolution of floral mimicry: identifying traits that visually attract pollinators. FUNCTIONAL ECOLOGY 26: 1381-1389.


  2. Johnson, S. D., Jürgens, A. & Kuhlmann, M. 2012. Pollination function transferred: modified tepals of Albuca (Hyacinthaceae) serve as secondary stigmas. ANNALS OF BOTANY 110: 565-572.


  3. Steenhuisen, S-L., Raguso, R. A. & Johnson, S. D. 2012. Floral scent in bird- and beetle-pollinated Protea species (Proteaceae): chemistry, emission rates and function. PHYTOCHEMISTRY 84: 78-87.


  4. Johnson, S. D., Newman, E. & Anderson, B. 2012. Preliminary evidence for insect pollination in Protea punctata (Proteaceae). SOUTH AFRICAN JOURNAL OF BOTANY 83: 63-67.


  5. Steenhuisen, S-L., van der Bank, H. & Johnson, S. D. 2012. The relative contributions of insect and bird pollinators to outcrossing in an African Protea (Proteaceae). AMERICAN JOURNAL OF BOTANY 99: 1104-1111.


  6. Newman, E., Anderson, B., & Johnson, S. D. 2012. Flower colour adaptation in a mimetic orchid. PROCEEDINGS OF THE ROYAL SOCIETY B: BIOLOGICAL SCIENCES 279: 2309-2313.


  7. van der Niet, T. & Johnson, S. D. 2012. Phylogenetic evidence for pollinator-driven diversification of angiosperms. TRENDS IN ECOLOGY AND EVOLUTION 27: 353-361.


  8. Suinyuy, T. N., Donaldson, J. S. & Johnson, S. D. 2012. Geographic variation in cone volatile composition among populations of the African cycad Encephalartos villosus. BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY 106: 514-527.


  9. de Vega, C., Guzmán, B., Lachance, M-A, Steenhuisen, S-L, Johnson, S. D. Herrera, C. M. 2012. Metschnikowia proteae sp. nov., a nectarivorous insect–associated yeast species from Africa. INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY 62: 2538-2545.


  10. Steenhuisen, S-L & Johnson, S. D. 2012. Evidence for autonomous selfing in grassland Protea species (Proteaceae). BOTANICAL JOURNAL OF THE LINNEAN SOCIETY 169: 433-446.


  11. Ellis, A. G. & Johnson, S. D. 2012. Lack of floral constancy by bee-fly pollinators: implications for ethological isolation in an African daisy. BEHAVIOURAL ECOLOGY 4: 729-734.


  12. Cornille A., Underhill J.G., Cruaud, A., Hossaert-McKey M., Johnson S. D., Tolley K.A., Kjellberg, F., van Noort S., Proffit M. 2012. Floral volatiles, pollinator sharing and diversification in the fig/wasp mutualism: insights from Ficus natalensis and its two wasp pollinators. PROCEEDINGS OF THE ROYAL SOCIETY B: BIOLOGICAL SCIENCES 279: 1731-1739.


  13. Shuttleworth, A. & Johnson, S. D. 2012. The Hemipepsis-wasp pollination system in South Africa: a comparative analysis of trait convergence in a highly specialized plant guild. BOTANICAL JOURNAL OF THE LINNEAN SOCIETY 168: 278–299.


  14. Steenhuisen, S-L & Johnson, S. D. 2012. Evidence for beetle pollination in the African grassland sugarbushes (Protea: Proteaceae). PLANT SYSTEMATICS AND EVOLUTION 298: 857-869.


  15. Steenhuisen, S-L & Johnson, S. D. 2012. The influence of pollinators and seed predation on seed production in dwarf grassland Protea "sugarbushes" (Proteaceae). SOUTH AFRICAN JOURNAL OF BOTANY 79: 77-83.


  16. Hargreaves, A.L., Harder, L.D & Johnson, S. D. 2012. Floral traits mediate the vulnerability of aloes to pollen theft and inefficient pollination by bees. ANNALS OF BOTANY 109: 761-772.


  17. Ward, M., Johnson, S. D. & Zalucki, M. P. 2012. Modes of reproduction in three invasive milkweeds are consistent with Baker’s Rule. BIOLOGICAL INVASIONS 14: 1237-1250.


  18. Turner, R. C., Midgley, J. J, Barnard. P., Simmons, R. & Johnson, S. D. 2012. Experimental evidence for bird pollination and corolla damage by ants in the short tubed flowers of Erica halicacaba (Ericaceae). SOUTH AFRICAN JOURNAL OF BOTANY 79: 25-31.


  19. Skelton, R., Midgley J., Nyaga, J., Johnson, S. D. & Cramer, M. 2012. Is leaf pubescence of Cape Floristic Region Proteaceae a xeromorphic or radiation-protective trait? AUSTRALIAN JOURNAL OF BOTANY 60: 104-113.


  20. Liltved, W. R. & Johnson, S. D. 2012. The Cape orchids: a regional monograph of the orchids of the Cape Floristic Region, in two volumes. Sandstone Editions, Noordhoek. 1022 pp. ISBN 978-0-9870197-0-7


  21. Hansen, D. van der Niet, T., & Johnson, S. D. 2012. Floral signposts: testing the significance of visual ‘nectar guides’ for pollinator behaviour and plant fitness. PROCEEDINGS OF THE ROYAL SOCIETY B: BIOLOGICAL SCIENCES 279: 634-639.


  22. Johnson, S. D., Hollens, H. & Kulhmann, M. 2012. Competition versus facilitation: conspecific effects on pollinator visitation and seed set in the iris Lapeirousia oreogena. OIKOS 121: 545–550.


  23. Brown, M., Downs, C. & Johnson, S. D. 2012. African Red-winged Starlings prefer hexose sugar solutions, but do not like them too sweet. JOURNAL OF ORNITHOLOGY 153: 265-272.


  24. Jordaan, L., Downs, C. & Johnson, S. D. 2012. Wahlberg's Epauletted Fruit Bat (Epomophorus wahlbergi) as a potential dispersal agent for fleshy-fruited invasive alien plants: effects of handling behaviour on seed germination. BIOLOGICAL INVASIONS 14: 959–968.


  25. Abdelgadir, H. A., Johnson, S. D. and van Staden, H. 2012. Pollen viability, pollen germination and pollen tube growth in the biofuel seed crop Jatropha curcas (Euphorbiaceae). SOUTH AFRICAN JOURNAL OF BOTANY 79: 132-139.


  26. Welsford, M. R. & Johnson, S. D. 2012. Solitary and social bees as pollinators of Wahlenbergia (Campanulaceae): single-visit effectiveness, overnight sheltering and responses to flower colour. ARTHROPOD-PLANT INTERACTIONS 6: 1-14.

2011
  1. Wragg, P & Johnson, S. D. 2011. Transition from wind to insect pollination in sedges: experimental evidence and functional traits. NEW PHYTOLOGIST 191: 1128-1140.


  2. Jordaan, L., Downs, C. & Johnson, S. D. 2011. Digestion of fruit of alien invasive plants by three southern African avian frugivores. IBIS 153: 863-867.


  3. Jordaan, L., Downs, C. & Johnson, S. D. 2011. The role of avian frugivores in germination of seeds of fleshy-fruited invasive alien plants. BIOLOGICAL INVASIONS 13:1917–1930.


  4. Gibson, M. R., Richardson, D. M., Marchante, E., Marchante, H., Rodger, J. G., Stone, G. N. Byrne, M. Fuentes-Ramírez, A., George, N. Harris, C., Johnson, S. D., Le Roux, J. J., Miller, J. T., Murphy, D. J. Pauw, A. Prescott, M. N., Wandrag, E. M., Wilson, J. R. U. 2011 Reproductive biology of Australian Acacia species: important mediator of invasiveness? DIVERSITY AND DISTRIBUTIONS 17: 911-933.


  5. Johnson, S. D., Peter, C. I, Ellis, A. G. Botes, C. & van der Niet, T. 2011. Diverse pollination systems of the twin-spurred orchid genus Satyrium in African grasslands. PLANT SYSTEMATICS AND EVOLUTION 292: 95–103.


  6. Johnson, S. D., Burgoyne, P., Harder, L. & Dotterl, S. 2011. Mammal pollinators lured by the scent of a parasitic plant. PROCEEDINGS OF THE ROYAL SOCIETY B: BIOLOGICAL SCIENCES 1716: 2303-2310.


  7. van der Niet, T., Liltved, W. & Johnson, S. D. 2011. More than meets the eye: A morphological and phylogenetic comparison of long spurred, white flowered Satyrium species (Orchidaceae) in South Africa. BOTANICAL JOURNAL OF THE LINNEAN SOCIETY 166: 417-430.


  8. Brown, M., Downs, C. & Johnson, S. D. 2011.Covariation of flower traits and bird pollinator assemblages among populations of Kniphofia linearifolia (Asphodelaceae). PLANT SYSTEMATICS AND EVOLUTION 294:199–206.


  9. Ramsey, M,. Vaughton, G., Ascough, G. D. & Johnson, S. D. 2011. Triploidy causes loss of sex in Cyrtanthus breviflorus (Amaryllidaceae). AUSTRALIAN JOURNAL OF BOTANY 59: 238-243.


  10. Turner, R, Midgley J.J. & Johnson, S.D. 2011. Evidence for rodent pollination in Erica hanekomii (Ericaceae). BOTANICAL JOURNAL OF THE LINNEAN SOCIETY 166: 163-170.


  11. van der Niet, T., Hansen, D. & Johnson, S. D. 2011. Carrion mimicry in a South African orchid: flowers attract a narrow subset of the fly assemblage on animal carcasses. ANNALS OF BOTANY 107: 981-992.


  12. Duffy, K & Johnson, S. D. 2011. Effects of pollen reward removal on fecundity in a self-incompatible hermaphrodite plant. PLANT BIOLOGY 13: 556–560.


  13. Voigt, F., Farwig, N. & Johnson, S. D. 2011. Interactions between the invasive tree Melia azedarach (Meliaceae) and native frugivores in South Africa. JOURNAL OF TROPICAL ECOLOGY 27:355–363.


  14. Menz, M. H. M, Phillips, R. D, Winfree, R., Kremen, C, Aizen, M. A., Johnson, S. D. & Dixon, K. D. 2011. Reconnecting plants and pollinators: challenges in the ecological restoration of pollination mutualisms. TRENDS IN PLANT SCIENCE 16: 4-12.


2010
  1. Ellis, A. G. & Johnson, S. D. 2010. Floral mimicry enhances pollen export: the evolution of pollination by sexual deceit outside of the Orchidaceae. AMERICAN NATURALIST 176: E143-E151.


  2. Vaughton G, Ramsey M, & Johnson S. D. 2010. Pollination and late-acting self-incompatibility in Cyrtanthus breviflorus (Amaryllidaceae): implications for seed production. ANNALS OF BOTANY 106: 547–555.


  3. Brown, M., Downs, C. & Johnson, S. D. 2010. Sugar preferences of a generalist non-passerine flower visitor, the African speckled mousebird. THE AUK 127: 781-786.


  4. Linder, H. P., Johnson, S. D., Kuhlmann, Matthee, C. A. Nyffeler, R. 2010. Biotic diversity in the Southern African winter-rainfall region. CURRENT OPINION IN ENVIRONMENTAL SUSTAINABILITY 2: 109–116.


  5. Odendaal, T. C., Brown, M., Downs, C. & Johnson, S. D. 2010. Sugar preferences and digestive efficiency of the Village Weaver, a generalist avian pollinator of African plants. JOURNAL OF EXPERIMENTAL BIOLOGY 213: 2531-2535.


  6. Shuttleworth, A. & Johnson, S. D. 2010. The missing stink: sulphur compounds can mediate a shift between fly and wasp pollination systems. PROCEEDINGS OF THE ROYAL SOCIETY B: BIOLOGICAL SCIENCES 277: 2811–2819.


  7. Abdelgadir, H. A., Jäger, A. K.,. Johnson, S. D. and van Staden, H. 2010. Influence of plant growth regulators on flowering, fruiting, seed oil content, and oil quality of Jatropha curcas. SOUTH AFRICAN JOURNAL OF BOTANY 76: 440–446


  8. Schiestl, F. P., Johnson, S. D. & Raguso, R. 2010. Floral evolution as a figment of pollinators' imaginations. TRENDS IN ECOLOGY AND EVOLUTION 7: 382-383.


  9. Rymer, P., Johnson, S. D. & Savolainen. V. 2010. Pollinator behaviour and plant speciation: can assortative mating and disruptive selection maintain distinct floral morphs in sympatry? NEW PHYTOLOGIST 188: 426–436.


  10. Suinyuy, T. N., Donaldson, J. S. & Johnson, S. D. 2010. Scent chemistry and patterns of thermogenesis in male and female cones of the African cycad Encephalartos natalensis (Zamiaceae). SOUTH AFRICAN JOURNAL OF BOTANY 76: 717-725 [Special issue: Chemical diversity and biological functions of plant volatiles].


  11. Johnson, S. D. & Jürgens, A. 2010. Convergent evolution of carrion and faecal scent mimicry in fly-pollinated angiosperm flowers and a stinkhorn fungus. SOUTH AFRICAN JOURNAL OF BOTANY 76: 796-807 [Special issue: Chemical diversity and biological functions of plant volatiles].


  12. Kotze, M.J., Jürgens, A.. Johnson, S. D. & Hoffman, J. H 2010. Volatiles associated with different flower stages and leaves of Acacia cyclops and their potential role as host attractants for Dasineura dielsi (Diptera: Cecidomyiidae). SOUTH AFRICAN JOURNAL OF BOTANY 76: 701-709 [Special issue: Chemical diversity and biological functions of plant volatiles].


  13. Steenhuisen, S-L., Raguso, R. A., Jürgens, A. & Johnson, S. D. 2010. Variation in scent emission among floral parts and inflorescence developmental stages in beetle-pollinated Protea species (Proteaceae). SOUTH AFRICAN JOURNAL OF BOTANY 76: 779-787 [Special issue: Chemical diversity and biological functions of plant volatiles].


  14. Shuttleworth, A. & Johnson, S. D. 2010. Floral scents of chafer-pollinated asclepiads and a potential hybrid. SOUTH AFRICAN JOURNAL OF BOTANY 76: 770-778 [Special issue: Chemical diversity and biological functions of plant volatiles].


  15. Johnson, S. D. & Hobbhan, N. 2010. Generalized pollination, floral scent chemistry, and a possible case of hybridization in the African orchid Disa fragrans. SOUTH AFRICAN JOURNAL OF BOTANY 76: 739-748 [Special issue: Chemical diversity and biological functions of plant volatiles]


  16. van der Niet, T., Jürgens, A. & Johnson, S. D. 2010. Pollinators, floral morphology and scent chemistry in the southern African orchid genus Schizochilus. SOUTH AFRICAN JOURNAL OF BOTANY 76: 726-738 [Special issue: Chemical diversity and biological functions of plant volatiles].


  17. Van der Niet, T, Zollikofer, C. P. E., Ponce de León, M. S., Johnson, S. D. & Linder, H. P. 2010. Three-dimensional geometric morphometrics for studying floral shape variation. TRENDS IN PLANT SCIENCE 15: 423-426.


  18. Ellis, A. G. & Johnson, S. D. 2010. Gender differences in the effects of floral spur length manipulation on fitness in a hermaphrodite orchid. INTERNATIONAL JOURNAL OF PLANT SCIENCES 171: 1010–1019.


  19. Brown, M., Downs, C. & Johnson, S. D. 2010.Sugar preferences and digestive efficiency in an opportunistic avian nectarivore, the Dark-capped Bulbul Pycnonotus tricolor. JOURNAL OF ORNITHOLOGY 151: 637-643.


  20. Brown, M., Downs, C. & Johnson, S. D. 2010. Pollination of the red-hot poker Kniphofia laxiflora (Asphodelaceae) by sunbirds. SOUTH AFRICAN JOURNAL OF BOTANY 76: 460–464.


  21. Horsley, T. N. & Johnson, S. D. 2010. Relative success of self and outcross pollen after mixed- and single-donor pollinations in Eucalyptus grandis. SOUTHERN FORESTS 72: 9-12.


  22. Rodger, J., van Kleunen, M. & Johnson, S. D. 2010. Does specialised pollination impede plant invasions? INTERNATIONAL JOURNAL OF PLANT SCIENCES 171: 382–391


  23. Johnson, S. D. & Anderson, B. 2010. Coevolution between food-rewarding flowers and their pollinators. EVOLUTION: EDUCATION AND OUTREACH 3: 32–39.


  24. Johnson, S. D. 2010. The pollination niche and its role in the diversification and maintenance of the southern African flora. PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY B: BIOLOGICAL SCIENCES 365: 499-516.


  25. Scopece, G., Cozzolino, S., Johnson, S. D. & Schiestl, F. P. 2010. Pollination efficiency and the evolution of specialized deceptive pollination systems. AMERICAN NATURALIST 175: 98-105.


  26. Hargreaves, A.L., Harder, L.D & Johnson, S. D. 2010. Native pollen thieves reduce the reproductive success of a hermaphroditic plant, Aloe maculata. ECOLOGY 91: 1693–1703.


  27. Anderson, B., Alexandersson, R. & Johnson, S. D. 2010. Evolution and coexistence of pollination ecotypes in an African Gladiolus (Iridaceae). EVOLUTION 64: 960 – 972.


  28. Horsley, T. N., Johnson, S. D. & Myburg, A. A. 2010. Comparison of different control-pollination techniques for small-flowered eucalypts. NEW FORESTS 39: 75-88.


  29. Brown, M., Downs, C. & Johnson, S. D. 2010. Concentration-dependent sugar preferences of the Malachite sunbird Nectarinia famosa. THE AUK 127: 151-155.


2009
  1. Johnson, S. D. 2009. Darwin’s legacy in South African evolutionary biology. SOUTH AFRICAN JOURNAL OF SCIENCE 105: 403-409.


  2. Martins, D. & Johnson, S. D. 2009. Distance and quality of natural habitat influence hawkmoth pollination of cultivated papaya. INTERNATIONAL JOURNAL OF TROPICAL INSECT SCIENCE 29: 114–123.


  3. Johnson, S. D., Griffiths, M. E., Peter, C. & Lawes, M. L. 2009. Pollinators, "mustard oil" volatiles, and fruit production in flowers of the dioecious tree Drypetes natalensis (Putranjivaceae). AMERICAN JOURNAL OF BOTANY 96: 2080-2086.


  4. Jersáková J, Johnson S. D., & Jürgens A., 2009. Food deception by plants: from generalized systems to specialized floral mimicry. In Baluška (ed.): Plant-Environment Interactions, Signaling and Communication in Plants, From Sensory Plant Biology to Active Plant Behavior. Springer-Verlag Berlin Heidelberg, pp 223-246.


  5. Micheneau, C., Johnson, S. D. & Fay, M. 2009. Orchid pollination: from Darwin to the present day. BOTANICAL JOURNAL OF THE LINNEAN SOCIETY 161: 1-19.


  6. Johnson, S. D., Manning, J. C., & Pauw, A. 2009. Advances in the pollination biology of South African plants. SOUTH AFRICAN JOURNAL OF BOTANY 75: 625-629. [Editorial for the special issue: Advances in the pollination biology of South African plants]


  7. Wolfe, L. M., Massinga, P. & Johnson, S. D. 2009. A quantitative evaluation of the distylous syndrome in Sebaea grandis (Gentianaceae). SOUTH AFRICAN JOURNAL OF BOTANY 75: 785-790. [Special issue: Advances in the pollination biology of South African plants]


  8. Proffit, M. & Johnson, S. D. 2009. Comparison of volatile organic compounds emitted by receptive syconia of Ficus sur and F. sycomorus in Southern Africa. SOUTH AFRICAN JOURNAL OF BOTANY 75: 771-777. [Special issue: Advances in the pollination biology of South African plants]


  9. Suinyuy, T., Donaldson, J. & Johnson, S. D. Insect pollination in the African cycad Encephalartos friderici-guilielmi Lehm. SOUTH AFRICAN JOURNAL OF BOTANY 75: 682-688. [Special issue: Advances in the pollination biology of South African plants]


  10. Peter, C. I. Coombs, G. Huchzermeyer, C. F., Venter, N., Winkler, A. C., Hutton, D., Papier, L. A., Dold, A. P. Johnson. S. D. 2009. Confirmation of hawkmoth pollination in Habenaria epipactidea: leg placement of pollinaria and crepuscular scent emission. SOUTH AFRICAN JOURNAL OF BOTANY 75: 744-750. [Special issue: Advances in the pollination biology of South African plants]


  11. Peter, C & Johnson, S. D. 2009. Autonomous self-pollination and pseudo-fruit set in South African species of Eulophia (Orchidaceae). SOUTH AFRICAN JOURNAL OF BOTANY 75: 791-797. [Special issue: Advances in the pollination biology of South African plants]


  12. Shuttleworth, A. & Johnson, S. D. 2009. New records of insect pollinators for South African asclepiads (Apocynaceae: Asclepiadoideae). SOUTH AFRICAN JOURNAL OF BOTANY 75: 689-698. [Special issue: Advances in the pollination biology of South African plants]


  13. Peter, C & Johnson, S. D. 2009. Pollination by flower chafer beetles in Eulophia ensata and E. welwitschii (Orchidaceae). SOUTH AFRICAN JOURNAL OF BOTANY 75: 762-770. [Special issue: Advances in the pollination biology of South African plants]


  14. Johnson, S. D. Harris, F. & Proches, S. 2009. Pollination and breeding systems of selected wildflowers in a southern African grassland community. SOUTH AFRICAN JOURNAL OF BOTANY 75: 630-645. [Special issue: Advances in the pollination biology of South African plants]


  15. Ferrero, V. de Vega, C. Stafford, G. I., van Staden, J. & Johnson, S. D. 2009. Heterostyly and pollinators in Plumbago auriculata (Plumbaginaceae). SOUTH AFRICAN JOURNAL OF BOTANY 75: 778-784. [Special issue: Advances in the pollination biology of South African plants]


  16. Brown, M., Downs, C. & Johnson, S. D. 2009. Pollination of the red-hot poker Kniphofia caulescens by short-billed opportunistic avian nectarivores. SOUTH AFRICAN JOURNAL OF BOTANY 75: 707-712. [Special issue: Advances in the pollination biology of South African plants]


  17. Botes, C., Wragg, P. D. & Johnson, S. D. 2009. New evidence for bee-pollination systems in Aloe (Asphodelaceae: Aloideae), a predominately bird-pollinated genus. SOUTH AFRICAN JOURNAL OF BOTANY 75: 675-681. [Special issue: Advances in the pollination biology of South African plants]


  18. de Vega, C., Herrera, C. M. & Johnson, S. D. 2009. Yeasts in floral nectar of some South African plants: quantification and associations with pollinator type. SOUTH AFRICAN JOURNAL OF BOTANY 75: 798-806. [Special issue: Advances in the pollination biology of South African plants]


  19. Harder, L. D. & Johnson, S. D. 2009. Darwin’s beautiful contrivances: evolutionary and functional evidence for floral adaptation. NEW PHYTOLOGIST 183: 530–545.


  20. Anderson, B. & Johnson, S. D. 2009. Geographical covariation and local convergence of flower depth in a guild of fly-pollinated plants. NEW PHYTOLOGIST 182: 533-540.


  21. Johnson, S. D., Torninger, E. & Ågren, J. 2009. Relationships between population size and pollen fates in a moth-pollinated orchid. BIOLOGY LETTERS 5: 282-285.


  22. Sheard, A. G., Johnson, S. D. & Cook, N. C. 2009. Effect of timing and concentration of rest breaking agents on budburst in ‘Bing’ sweet cherry under conditions of inadequate winter chilling in South Africa. SOUTH AFRICAN JOURNAL OF PLANT & SOIL 26: 73-79.


  23. Proches, S & Johnson, S. D. 2009. Beetle pollination of the fruit-scented cones of the South African cycad Stangeria eriopus AMERICAN JOURNAL OF BOTANY 96: 1722–1730


  24. Shuttleworth, A. & Johnson, S. D. 2009. The importance of scent and nectar filters in a specialized wasp-pollination system. FUNCTIONAL ECOLOGY 23: 931–940.


  25. Shuttleworth, A. & Johnson, S. D. 2009. Specialized pollination in the African milkweed Xysmalobium orbiculare: A key role for floral scent in the attraction of spider-hunting wasps. PLANT SYSTEMATICS AND EVOLUTION 280: 37–44.


  26. Horsley, T., Jones, N. B. & Johnson, S. D. & Stanger, T. 2009. A novel gel-based method for isolation of stigmas during controlled pollination experiments. SILVAE GENETICA 58: 226-233.


  27. Abdelgadir, H. A., Johnson, S. D. and van Staden, H. 2009. Promoting branching of a biofuel crop Jatropha curcas L. by foliar application of plant growth regulators. PLANT GROWTH REGULATION 58: 287–295.


  28. Abdelgadir, H. A., Johnson, S. D. and van Staden, H. 2009. Pollinator effectiveness, breeding system, and tests for inbreeding depression in the biofuel seed crop, Jatropha curcas. THE JOURNAL OF HORTICULTURAL SCIENCE AND BIOTECHNOLOGY 84: 319-324.


  29. Ellis, A.G & Johnson, S. D. 2009. The evolution of floral variation without pollinator shifts in Gorteria diffusa (Asteraceae). AMERICAN JOURNAL OF BOTANY 96:793-801.


  30. Shuttleworth, A. & Johnson, S. D. 2009. A key role for floral scent in a wasp-pollination system in Eucomis (Hyacinthaceae). ANNALS OF BOTANY 103: 715-725.


  31. Botes, C, Johnson, S. D & Cowling, R. M. 2009. The birds and the bees: using selective exclusion to identify effective pollinators of African tree aloes. INTERNATIONAL JOURNAL OF PLANT SCIENCES 170: 151-156.


  32. Coombs, G, Peter, C. I. & Johnson, S. D. 2009. A test for Allee effects in the self-incompatible wasp-pollinated milkweed Gomphocarpus physocarpus. AUSTRAL ECOLOGY 34: 688-697.


  33. Wilson, A-L, Ward, D, Brown, M. & Johnson, S. D. 2009. Seed production in a threatened aloe is not affected by bird exclusion or population size. PLANT ECOLOGY 203: 173-182.


  34. van der Niet, T. & Johnson, S. D. 2009. Patterns of plant speciation in the Cape floristic region. MOLECULAR PHYLOGENETICS AND EVOLUTION 51: 85-93.


  35. Ponsie, M. E. Johnson, S. D. & Edwards, T. J. 2009. A morphometric analysis of the Bonatea speciosa complex (Orchidaceae) and its implications for species boundaries. NORDIC JOURNAL OF BOTANY 27: 166-177.


  36. Hargreaves, A.L., Harder, L.D & Johnson, S. D. 2009. Consumptive emasculation: the ecological and evolutionary implications of pollen theft. BIOLOGICAL REVIEWS 84: 259-276.


  37. Peter, C & Johnson, S. D. 2009. Reproductive biology of Acrolophia cochlearis (Orchidaceae) and a new method for estimating levels of cross-pollination in orchids. ANNALS OF BOTANY 104:573-581.


  38. Proches, S., Forest, F., Veldtman, R., Chown, S. L., Cowling, R. M., Johnson, S. D., Richardson, D. M. & Savolainen, V. 2009. Dissecting the plant-insect diversity relationship in the Cape. MOLECULAR PHYLOGENETICS AND EVOLUTION 51: 94-99.


  39. Shuttleworth, A. & Johnson, S. D. 2009. Palp-faction: an African milkweed dismembers its wasp pollinators. ENVIRONMENTAL ENTOMOLOGY 38: 741-747.


2008
  1. Kleizen, C., Midgley, J. & Johnson, S. D. 2008. Pollination Systems of Colchicum (Colchicaceae) in southern Africa: evidence for rodent-pollination. ANNALS OF BOTANY 5: 747-755.


  2. Brown, M., Downs, C. & Johnson, S. D. 2008. Sugar preferences of nectar feeding birds: a comparison of experimental techniques. JOURNAL OF AVIAN BIOLOGY 39: 479-483.


  3. Botes, C., Johnson, S. D & Cowling, R. M. 2008. Coexistence of succulent tree aloes: partitioning of bird pollinators by floral traits and flowering phenology. OIKOS 117: 875-882.


  4. Hargreaves, A. L., Harder, L. D. & Johnson, S. D. 2008. Aloe inconspicua: the first record of an exclusively insect-pollinated aloe. SOUTH AFRICAN JOURNAL OF BOTANY 74: 606-612.


  5. Shuttleworth, A. & Johnson, S. D. 2008. Bimodal pollination by wasps and beetles in the African milkweed Xysmalobium undulatum. BIOTROPICA 40: 568-574.


  6. Peter, C. & Johnson, S. D. 2008. Mimics and magnets: the importance of color and ecological facilitation in floral deception. ECOLOGY 89: 1583-1595.


  7. Jersáková, J., Johnson, S. D., Kindlmann, P. & Pupin, A-C. 2008. Effect of nectar supplementation on male and female components of pollination success in the deceptive orchid Dactylorhiza sambucina. ACTA OECOLOGIA 33:300-306.


  8. Ford, C. & Johnson, S. D. 2008. Floral traits, pollinators and breeding systems in Syncelostemon (Lamiaceae). PLANT SYSTEMATICS AND EVOLUTION 275: 257-264.


  9. Ponsie, M. E., Johnson, S. D. & Edwards, T. J. 2008. A morphometric analysis of species boundaries in the Bonatea cassidea complex. NORDIC JOURNAL OF BOTANY 25: 257-267.


  10. Lovegrove, B. G. & Johnson, S. D. 2008. Assessment of research performance in biology: how well do peer-review and bibliometric measures correlate? BIOSCIENCE 58: 160-164.


  11. Johnson, S. D. & Nicolson, S. W. 2008. Evolutionary associations between nectar properties and specificity in bird-pollination systems. BIOLOGY LETTERS 4: 49-52.


  12. Van Kleunen, M., Manning, J. C., Pasqualetto, V. & Johnson, S. D. 2008. Phylogenetically independent associations between autonomous self-fertilization and plant invasiveness. AMERICAN NATURALIST 171: 195-201.


  13. Harder, L. D. & Johnson, S. D. 2008. Function and evolution of aggregated pollen in angiosperms. INTERNATIONAL JOURNAL OF PLANT SCIENCES 169: 59-78.


  14. Larsen, M., Peter, C., Johnson, S. D. & Olesen, J. M. 2008.Comparative biology of pollination systems in the African– Malagasy genus Brownleea (Brownleeinae: Orchidaceae). BOTANICAL JOURNAL OF THE LINNEAN SOCIETY 156: 65-78.


  15. Anderson, B & Johnson, S. D. 2008. The geographical mosaic of coevolution in a plant-pollinator mutualism. EVOLUTION 62: 220-225.


2007
  1. Van Kleunen, M., Fischer, M & Johnson, S. D. 2007. Reproductive assurance through self-fertilization does not vary with population size in the alien invasive plant Datura stramonium. OIKOS 116: 1400-1412.


  2. Horsley, T. & Johnson, S. D. 2007. Is Eucalyptus cryptically self-incompatible? ANNALS OF BOTANY 100: 1373-1378.


  3. Martins, D. & Johnson, S. D. 2007. Hawkmoth pollination of aerangoid orchids in Kenya, with special reference to nectar sugar gradients in the floral spurs. AMERICAN JOURNAL OF BOTANY 94: 650-659.


  4. Jersakova, J. & Johnson, S. D. 2007. Protandry promotes male pollination success in a moth-pollinated orchid. FUNCTIONAL ECOLOGY 21: 496-504.


  5. Van Kleunen, M. & Johnson, S. D. 2007. South African Iridaceae with rapid and profuse seedling emergence are more likely to become naturalized in other regions. JOURNAL OF ECOLOGY 95: 674-681.


  6. Van Kleunen, M., Johnson, S. D. & Fischer, M. 2007. Predicting naturalisation of southern African Iridaceae in other regions. JOURNAL OF APPLIED ECOLOGY 44: 594-603.


  7. Van Kleunen, M. & Johnson, S. D. 2007. Effects of self-compatibility on the distribution range of invasive European plants in North America. CONSERVATION BIOLOGY 21: 1537-1544.


  8. Horsley, T. Johnson, S. D. & Stanger, T. 2007. Optimising storage and in vitro germination of Eucalyptus pollen. AUSTRALIAN JOURNAL OF BOTANY 55: 83-89.


  9. Ponsie, M. E. Mitchell, A., Edwards T. J. & Johnson. S. D. 2007. Phylogeny of Bonatea (Orchidaceae) based on molecular and morphological data. PLANT SYSTEMATICS AND EVOLUTION 263: 253-268.


  10. Johnson, S. D., Ellis, A. & Dötterl, S. 2007. Specialization for pollination by beetles and wasps: the role of lollipop hairs and fragrance in Satyrium microrrhynchum (Orchidaceae). AMERICAN JOURNAL OF BOTANY 94: 47-55.


  11. Ponsie ME, Edwards TJ and Johnson SD. 2007. Habenaria transvaalensis Schltr. and Habenaria bonateoides M. Ponsie: revised descriptions and distributional records. SOUTH AFRICAN JOURNAL OF BOTANY 73: 355-359.


  12. Hansen, D. M., Olesen, J. M., Mione, T. Johnson, S. D, Müller, C. B. 2007. Coloured nectar: ecology and evolution of an enigmatic floral trait. BIOLOGICAL REVIEWS 82: 83-111.


  13. 87 Ponsie, M. E., Edwards, T.J. & Johnson, S. D. 2007. A taxonomic revision of Bonatea Willd. (Orchidaceae: Orchidoideae: Habenariinae). SOUTH AFRICAN JOURNAL OF BOTANY 73: 1-21.


2006


  1. Rebelo, A.G., Boucher, C., Helme, N., Mucina, L., Rutherford, M.C., Smit, W.J., Powrie, L.W., Ellis, F., Lambrechts, J.J., Scott, L., Radloff, F.G.T., Johnson, S.D., Richardson, D.M., Ward, R.A., Proches, S.M., Oliver, E.G.H., Manning, J.C., Jürgens, N., McDonald, D.J., Janssen, J.A.M., Walton, B.A., Le Roux, A., Skowno, A.L., Todd, S.W. & Hoare, D.B. 2006. Fynbos Biome. In: Mucina, L. & Rutherford, M.C. (eds), The vegetation of South Africa, Lesotho and Swaziland, pp. 52-219. SANBI, Pretoria.


  2. Shuttleworth, A. & Johnson, S. D. 2006. Specialized pollination by large spider-hunting wasps and self-incompatibility in the African milkweed Pachycarpus asperifolius. INTERNATIONAL JOURNAL OF PLANT SCIENCES 167: 1177-1186.


  3. Van der Niet, T., Johnson, S. D. & Linder. H. P. 2006. Macro-evolutionary data suggest a role for reinforcement in pollination system shifts. EVOLUTION 60: 1596-1601.


  4. Johnson, S. D., Hargreaves, A. & Brown, M. 2006. Dark bitter-tasting nectar functions as a filter of flower visitors in a bird-pollinated plant. ECOLOGY 87: 2709-2716.


  5. Johnson, S. D. 2006. Pollinator-driven speciation in plants. In Harder, L. D & Barrett, S. C. H (eds). The Ecology and Evolution of Flowers. Oxford University Press, pp 296-306


  6. Valentin, S. Lunau, K. & Johnson, S. D. 2006. Choice experiments using artificial flowers reveal colour preferences of long-proboscid flies (Diptera, Nemestrinidae) under field conditions. ENTOMOLOGIE HEUTE 18: 113-122.


  7. Anderson, B. & Johnson, S. D. 2006. The effects of floral mimics and models on each other’s fitness. PROCEEDINGS OF THE ROYAL SOCIETY B 273: 969-974.


  8. Johnson, S. D. & Morita, S. 2006. Lying to Pinocchio: floral deception in an orchid pollinated by long-proboscid flies. BOTANICAL JOURNAL OF THE LINNEAN SOCIETY 152: 271-278.


  9. Peter, C. & Johnson, S. D. 2006. Anther cap retention: a mechanism to limit self-pollination by elaterid beetles in the South African orchid Eulophia foliosa. ANNALS OF BOTANY 97: 345-355.


  10. Jersakova, J., Johnson, S. D. & Kindlmann, P. 2006. Mechanisms and evolution of deceptive pollination in orchids. BIOLOGICAL REVIEWS 81: 219-235.


  11. Ollerton, J. Johnson, S. D. & Hingston, A. B. 2006. Geographical variation in diversity and specificity of plant pollination systems. In Waser, N. M. & Ollerton J. (eds). Plant-pollinator interactions: from specialization to generalization. Chicago University Press pp 283-308.


  12. Johnson, S. D. 2006. Pollination by long-proboscid flies in the endangered African orchid Disa scullyi. SOUTH AFRICAN JOURNAL OF BOTANY 72: 24-27.


  13. Jersakova, J. & Johnson, S. D. 2006. Lack of floral nectar reduces self-pollination in a fly-pollinated orchid. OECOLOGIA 147: 60-68.


  14. Peter, C. & Johnson, S. D. 2006. Doing the twist: a test of Darwin’s cross-pollination hypothesis for pollinium reconfiguration. BIOLOGY LETTERS 2: 65-68.


2005


  1. Harder, L. D. & Johnson, S. D. 2005. Adaptive plasticity of floral display in animal-pollinated plants. PROCEEDINGS OF THE ROYAL SOCIETY B 271: 2651-2657.


  2. Anderson, B, Johnson, S. D. & Carbutt, C. 2005. Exploitation of a specialized mutualism by a deceptive orchid. AMERICAN JOURNAL OF BOTANY 92: 1342-1349. 70 Johnson, S. D., Steiner, K. E & Kaiser R. 2005. Deceptive pollination in two subspecies of Disa spathulata (Orchidaceae) differing in morphology and floral fragrance. PLANT SYSTEMATICS AND EVOLUTION 255: 87-98.


  3. Van Kleunen, M & Johnson, S. D. 2005. Testing for ecological and genetic Allee effects in the invasive shrub Senna didymobotra (Fabaceae). AMERICAN JOURNAL OF BOTANY 92: 1124-1130 .


  4. Massinga, P. H., Johnson, S. D. & Harder, L. D. 2005. Heteromorphic incompatibility and efficiency of pollination in two distylous Pentanisia species (Rubiaceae). ANNALS OF BOTANY 95: 389-399.


  5. Johnson, S. D. Neal, P. R & Harder, L. D. 2005. Pollen fates and the limits on male reproductive success in an orchid population. BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY 86: 175-190.


  6. Ward, M. & Johnson, S. D. 2005. Pollen limitation and demographic structure in small fragmented populations of Brunsvigia radulosa (Amaryllidaceae). OIKOS 108: 253-262.


  7. Linder, H. P., Kurzweil, H. & Johnson, S. D. 2005. The southern African orchid flora: composition, sources, and endemism. JOURNAL OF BIOGEOGRAPHY 32: 29-47.


  8. Johnson, S. D. 2005. Specialized pollination by spider-hunting wasps in the African orchid Disa sankeyi. PLANT SYSTEMATICS AND EVOLUTION 251: 153-160.


2004
  1. Rambuda, T. D. & Johnson, S. D. 2004. Breeding systems of invasive alien plants in South Africa: does Baker’s Rule apply? DIVERSITY AND DISTRIBUTIONS 10: 409-416.


  2. L. F. Harris & Johnson, S. D. 2004. The consequences of habitat fragmentation for plant-pollinator mutualisms. INTERNATIONAL JOURNAL OF TROPICAL INSECT SCIENCE 24: 29-43.


  3. Johnson, S. D., Collin, C., Wissman, J., Halverson, E., & Ågren, J. 2004. Factors influencing variation in seed production among populations of the endangered daisy Gerbera aurantiaca. BIOTROPICA 36: 148-155.


  4. Johnson, S. D., Neal, P. R. Peter, C. I., & Edwards, T. 2004. Fruiting failure and limited recruitment in remnant populations of the hawkmoth-pollinated tree Oxyanthus pyriformis subsp. pyriformis (Rubiaceae). BIOLOGICAL CONSERVATION 120: 31-39.


  5. Archibald, J., Wolfe, A. & Johnson, S. D 2004. Hybridization and gene flow between a day- and night-flowering species of Zaluzianskya (Scrophulariaceae). AMERICAN JOURNAL OF BOTANY 91: 1333-1344.


  6. Hargreaves, A., Johnson, S. D., & Nol, E. 2004. Do floral syndromes predict specialization in plant pollination systems? An experimental test in an "ornithophilous" African Protea. OECOLOGIA 140: 295-301.


  7. Johnson, S. D., Peter, C I. & Ågren, J. 2004. The effects of nectar addition on pollen removal and geitonogamy in the non-rewarding orchid Anacamptis morio. PROCEEDINGS OF THE ROYAL SOCIETY B. 271: 803-809.


  8. Johnson, S. D. & Brown, M. 2004. Transfer of pollinaria on birds’ feet: a new pollination system in orchids. PLANT SYSTEMATICS AND EVOLUTION 244: 181-188.


  9. Johnson, S. D. 2004. An overview of plant-pollinator relationships in southern Africa. INTERNATIONAL JOURNAL OF TROPICAL INSECT SCIENCE 24: 45-54.


2003
  1. Johnson, S. D, Peter, C. I., Nilsson, L. A. & Ågren, J. 2003. Pollination success in a deceptive orchid is enhanced by co-occurring rewarding “magnet” plants. ECOLOGY 84: 2919-2927


  2. Johnson, S. D. & Steiner, K. E. 2003. Specialized pollination systems in southern Africa. SOUTH AFRICAN JOURNAL OF SCIENCE 99: 345-348.


  3. Johnson, S. D., Alexandersson, R. & Linder, H. P. 2003. Phylogenetic and experimental evidence for floral mimicry in a guild of fly-pollinated plants. BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY 80: 289-304.


  4. Ollerton J., Johnson S. D., Kelly, S., Cramer, L. 2003. The pollination ecology of an assemblage of grassland asclepiad species in South Africa. ANNALS OF BOTANY 92: 807-834.


2002
  1. Johnson, S. D. & Andersson, S. 2002. A simple field method for manipulating ultraviolet reflectance in flowers. CANADIAN JOURNAL OF BOTANY 80: 1325-1328.


  2. Anderson, G. J., Johnson, S. D, Neal, P. R. and Bernardello, G. 2002. Reproductive biology and plant systematics: the growth of a symbiotic association. TAXON 51: 637-653.


  3. Luyt, R & Johnson, S. D. 2002. Nectar reabsorption in an epiphytic orchid, and its consequences for reproductive success. BIOTROPICA 34: 442-446.


  4. Alexandersson, R. & Johnson, S. D. 2002. Pollinator-mediated selection on floral tube length in a hawkmoth-pollinated Gladiolus (Iridaceae). PROCEEDINGS OF THE ROYAL SOCIETY B. 269: 631-636.


  5. Johnson, S. D., Edwards, T. E., Carbutt, C. & Potgieter, C. 2002. Specialization for hawkmoth and long-proboscid fly pollination in Zaluzianskya section Nycterinia (Scrophulariaceae). BOTANICAL JOURNAL OF THE LINNEAN SOCIETY 138: 17-27.

2001
  1. Johnson, S. D. 2001. Hawkmoth pollination and hybridization in Delphinium leroyi (Ranunculaceae) on the Nyika Plateau, Malawi. NORDIC JOURNAL OF BOTANY 21: 599-605.


  2. Johnson, S. D., Pauw, A. and Midgley, J. 2001. Rodent pollination in the African lily Massonia depressa (Hyacinthaceae). AMERICAN JOURNAL OF BOTANY 88: 1768-1773.


  3. Johnson, S. D & Midgley, J. 2001. Pollination by monkey beetles (Scarabaeidae: Hopliini): do colour and dark centers of flowers influence alighting behaviour. ENVIRONMENTAL ENTOMOLOGY 30: 861-868.


  4. Luyt, R. & Johnson, S. D. 2001. Hawkmoth pollination of Mystacidium venosum (Orchidaceae), with special reference to flower and pollen longevity. PLANT SYSTEMATICS AND EVOLUTION 228: 49-62.


  5. Johnson, S. D. 2001. Pollination (Diseae). In Pridgeon, A, Cribb, P. (eds). Genera Orchidacearum. Volume 2 Orchidoideae. Oxford University Press, pp 39-43.


  6. Johnson, S. D. 2001. Pollination (Satyriinae). In Pridgeon, A, Cribb, P. (eds). Genera Orchidacearum. Volume 2 Orchidoideae. Oxford University Press, pp 56-57.


2000
  1. Johnson, S. D. & Steiner, K. E. 2000. Generalization versus specialization in plant pollination systems. TRENDS IN ECOLOGY AND EVOLUTION 15: 140-143.


  2. Johnson, S. D. and Edwards, T. 2000. The structure and function of orchid pollinaria. PLANT SYSTEMATICS AND EVOLUTION 222: 243-269.


  3. Johnson, S. D. 2000. Batesian mimicry in the non-rewarding orchid Disa pulchra, and its consequences for pollinator behaviour. BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY 71: 119-132.

1999
  1. Ellis, A. & Johnson, S. D. 1999. Do pollinators maintain the species integrity of sympatric Satyrium species (Orchidaceae)? PLANT SYSTEMATICS AND EVOLUTION 219: 137-150.


  2. Johnson, S. D. & Nilsson, L. A. 1999. Pollen carryover, geitonogamy and the evolution of deception in orchids. ECOLOGY 80: 2607-2619.


  3. Johnson, S. D. & Steiner, K. E. 1999. Pollination. In: Linder, H.P., Kurzweil, H. (eds). Orchids of southern Africa. Balkema


  4. Pauw, A. & Johnson, S. D. 1999. Table Mountain: a natural history. Fernwood Press, Cape Town.

1998
  1. Johnson, S. D., Linder H.P & Steiner, K.E. 1998. Phylogeny and radiation of pollination systems in Disa (Orchidaceae). AMERICAN JOURNAL OF BOTANY 85: 402-411.


  2. Johnson, S. D. & Kurzweil, H. 1998. Systematics and evolution of the Satyrium erectum group (Orchidaceae), with descriptions of two new species from the Karoo region of South Africa. BOTANICAL JOURNAL OF THE LINNEAN SOCIETY 127: 179-194.


  3. Linder, H. P., Johnson, S. D. & Liltved, W. R. 1998. Disa virginalis, (Disaea: Orchidoideae: Orchidaceae), a new species from southern Africa. NOVON 8: 405-407.


  4. Johnson, S. D., Steiner, K. E. & Whitehead, V. B. 1998. Pollination ecology and maintenance of species integrity in co-occurring Disa racemosa L.f. and Disa venosa Sw. (Orchidaceae) in South Africa. ANNALS OF THE MISSOURI BOTANICAL GARDENS 85: 231-241.


  5. Johnson, S. D., Dafni, A. 1998. Response of bee-flies to the shape and pattern of model flowers: implications for floral evolution in a mediterranean herb. FUNCTIONAL ECOLOGY 12: 289-297.


  6. Midgley, J.J. & Johnson S. D. 1998. Some pollinators do not prefer symmetrically marked or shaped daisy (Asteraceae) flowers. EVOLUTIONARY ECOLOGY 12:123-126

1997
  1. Johnson, S. D. & Liltved, W. R. 1997. Disa cochlearis, a new orchid species from the Karoo region of South Africa. SOUTH AFRICAN JOURNAL OF BOTANY 63:291-293.


  2. Johnson, S. D. & Steiner, K.E. 1997. Long-tongued fly pollination and evolution of floral spur length in the Disa draconis complex (Orchidaceae). EVOLUTION 51: 45-53.


  3. Johnson, S. D. & Liltved, W.R. 1997. Hawkmoth pollination of Bonatea speciosa in a South African coastal forest. NORDIC JOURNAL OF BOTANY. 17: 5-10.


  4. Johnson, S. D. 1997. Pollination ecotypes of Satyrium hallackii (Orchidaceae) in South Africa. BOTANICAL JOURNAL OF THE LINNEAN SOCIETY 123: 225-235.


  5. Johnson, S. D. & Bond, W.J. 1997. Evidence for widespread pollen-limitation of fruiting success in Cape wildflowers. OECOLOGIA 109: 530-534.


  6. Johnson, S. D & Midgley, J. 1997. Fly pollination of Gorteria diffusa (Asteraceae), and a possible mimetic function for dark spots on the capitulum. AMERICAN JOURNAL OF BOTANY 84: 429-436.


  7. Johnson, S. D. 1997. Insect pollination and floral mechanisms in South African species of Satyrium (Orchidaceae) PLANT SYSTEMATICS AND EVOLUTION 204: 195-206.

1996
  1. Johnson, S. D. 1996. Bird pollination in South African species of Satyrium (Orchidaceae). PLANT SYSTEMATICS AND EVOLUTION 203: 91-98.


  2. Johnson, S. D. 1996. Pollination, adaptation and speciation models in the Cape flora. TAXON. 45: 59-66.

1995
  1. Johnson, S. D. & Linder H.P. 1995. The systematics and evolution of the Disa draconis complex (Orchidaceae). BOTANICAL JOURNAL OF THE LINNEAN SOCIETY 118: 289-307.


  2. Johnson, S. D. & Steiner, K. 1995. Long-proboscid fly pollination of two orchids in the Cape Drakensberg Mountains, South Africa. PLANT SYSTEMATICS AND EVOLUTION 195: 169-175.


  3. Johnson, S. D. 1995. Moth pollination of the cryptic Cape orchid Monadenia ophrydea. FLORA 190: 106-108.


  4. Johnson, S. D. 1995. Observations of hawkmoth pollination in the South African orchid Disa cooperi. NORDIC JOURNAL OF BOTANY 15: 121-125.


  5. Johnson, S. D. 1995. The pollination of Disa versicolor (Orchidaceae) by anthophorid bees in South Africa. LINDLEYANA 9: 209-212.

1994
  1. Steiner, K.E., Whitehead, V.B. & Johnson, S. D. 1994. Floral and pollinator divergence in two sexually deceptive Cape orchids. AMERICAN JOURNAL OF BOTANY 81: 185-194.


  2. Johnson, S. D. & Bond, W.J. 1994. Red flowers and butterfly pollination in the fynbos of South Africa. In: Arianoutsou, M., Groves, R.H. (eds). Plant-animal interactions in Mediterranean-type ecosystems. Dordrecht: Kluwer Academic Publishers, 137-148.


  3. Johnson, S. D., Steiner, K. & Kurzweil, H. 1994. Auto-pollination in Disa species (Orchidaceae) of the Cape mountain cloud zone. LINDLEYANA 9: 3-6.


  4. Johnson, S. D. & Steiner, K. 1994. Efficient pollination of the mass flowering Cape orchid Disa obtusa Lindl. by Bibio turneri Edwards (Diptera: Bibionidae). AFRICAN ENTOMOLOGY 2: 64-66.


  5. Johnson, S. D. & Steiner, K. 1994. Pollination by megachilid bees and determinants of fruit set in the Cape orchid Disa tenuifolia. NORDIC JOURNAL OF BOTANY 14: 481-485.


  6. Johnson, S. D. 1994. Evidence for Batesian mimicry in a butterfly-pollinated orchid. BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY 53: 91-104.

1993
  1. Johnson, S. D. 1993. Carpenter bee pollination of Herschelianthe graminifolia (Orchidaceae) on the Cape Peninsula. FLORA 188: 383-386.


  2. Johnson, S. D., Ellis, A., Carrick, P., Swift, A., Horner, N., Janse van Rensburg, J. & Bond, W.J. 1993. Moth pollination and rhythms of advertisement and reward in Crassula fascicularis (Crassulaceae). SOUTH AFRICAN JOURNAL OF BOTANY 59: 511-513.


  3. Johnson, S. D. 1993. Climatic and phylogenetic determinants of flowering seasonality in the Cape flora. JOURNAL OF ECOLOGY 81: 567-572.

1992
  1. Johnson, S. D. 1992. Plant animal relationships. In: Cowling, R.M., ed. The ecology of fynbos: fire, nutrients and diversity. Cape Town: Oxford University Press, 175-205.


  2. Johnson, S. D. 1992. Pollination of Disa filicornis (Orchidaceae) through deception of mason bees. SOUTH AFRICAN JOURNAL OF BOTANY 58: 541-542.


  3. Johnson, S. D. & Bond, W.J. 1992. Habitat dependent pollination success in a Cape orchid. OECOLOGIA 91: 455-456.




Book Reviews


  1. Johnson, S. D. 2007. The chemical language of flowers: a review of “Biology of Floral Scent” (edited by Natalia Dudareva and Eran Pichersksy). SOUTH AFRICAN JOURNAL OF BOTANY 73: 475-476.


Conference proceedings published as book chapters


  1. Johnson, S. D. & Bond, W.J. 1992. Convergent Floral Evolution in a Guild of Butterfly Pollinated Fynbos Plants. In: Thanos C, ed. Proceedings of the 6th International Conference on Mediterranean Ecosystems. Athens: University of Athens, 228-233.


  2. Johnson, S. D. 2002.The pollination ecology of southern African orchids. pp 213-217. In Clark, J, Elliott, M., Tingley, G. and Biro, J. (eds). Proceedings of the 16th world orchid conference. Vanvouver Orchid Society, Vancouver


  3. Johnson, S. D. 2014. Pollinators and orchid floral diversity in southern Africa. Proceedings of the 20th world orchid conference. Orchid Society of SE Asia (in press)



Popular science articles


  1. Johnson, S. D. 1992. A butterfly with a passion for red. AFRICAN WILDLIFE 46: 176-178.


  2. Johnson, S. D. 1992. Buzz pollination of Orphium frutescens. VELD & FLORA 78: 36-37


  3. Johnson, S. D. 1992. The pollination of Disa filicornis. SOUTH AFRICAN ORCHID JOURNAL 23: 51


  4. Johnson, S. D. & Johnson, K. 1993. Beauty and the beast: a Cape orchid pollinated by horseflies. VELD & FLORA 79: 38-39.


  5. Johnson, S. D. 1993. Preliminary observations on the pollination of Disperis capensis. SOUTH AFRICAN ORCHID JOURNAL 25: 22-23.


  6. Johnson, S. D. 1993. Red disas and brown butterflies. SOUTH AFRICAN ORCHID JOURNAL. 24: 9-12.


  7. Kurzweil, H. & Johnson, S. D. 1993. Auto-pollination in Monadenia bracteata. SOUTH AFRICAN ORCHID JOURNAL 24: 21-22.


  8. Johnson, S. D. 1993. The pollination of Satyrium hallackii at Verloren Valei. SOUTH AFRICAN ORCHID JOURNAL 24: 124.


  9. Johnson, S. D. 1993. A belated discovery: the pollinator of Herschelianthe graminifolia. SOUTH AFRICAN ORCHID JOURNAL 24: 83-84.


  10. Johnson S. D. 1994. Wild orchids. COUNTRY LIFE 2: 78-82.


  11. Johnson, S. D. & Fraser, M. 1996. Sunbird pollination of a South African orchid. AFRICA: BIRDS AND BIRDING. 1: 14-15.


  12. Johnson, S. D. & Snijman, D. 1996 Amaryllis belladonna: the Cape's fairest lily is adapted to a fire prone environment. VELD & FLORA 82: 70-71.


  13. Johnson, S. D. 1996. Pollination of Satyrium species - latest findings. SOUTH AFRICAN ORCHID JOURNAL 27: 70-73.


  14. Johnson, S. D. 1996. Cape Drakensberg - the forgotten end of the Dragon's tail. GETAWAY 8: 56-63, 169.


  15. Johnson, S. D. 1997. Self-pollination in Disa woodii. SOUTH AFRICAN ORCHID JOURNAL 28: 94.


  16. Pauw, A. & Johnson, S. D. 2001. Table Mountain: wilderness in a city. READERS DIGEST. May: 42-50.


  17. Johnson, S. D., Pauw, A & Midgley, J. 2001. Of mice and Massonias. VELD & FLORA 88: 166-168.


  18. Johnson, S. D. & Botha, M. 2002. The nightlife of Maputaland: encounters with giant hawkmoths and their flowers. VELD & FLORA 88: 52-53.


  19. Johnson, S. D. 2004. Sunbirds pollinate orchids – with their feet! AFRICA BIRDS & BIRDING 9 (4): 18-19.


  20. Sessions, L. A. & Johnson, S. D. 2005. The flower and the fly. NATURAL HISTORY 114: 58-63.


  21. Johnson, S. D. 2007. Sweet pickings: pollination of plants by occasional nectarivores. AFRICA BIRDS & BIRDING.12: 27-31.

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