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Article
Mark Brown, Auteur ; Colleen T. Downs, Auteur ; Steven D. Johnson, AuteurGlobally, two bird pollination systems have been recognised, involving specialist and occasional nectar-feeding birds. Whether avian pollinators place selective pressure on the plants they feed on, in terms of flower morphology and nectar traits[...]
Article
Lorinda A. Jordaan, Auteur ; Steven D. Johnson, Auteur ; Colleen T. Downs, AuteurMany highly invasive plants are fleshy-fruited and owe their invasiveness largely to mutualisms formed with local dispersers. The energetic benefits gained by frugivores from ingestion of fruits of invasive alien plants remain poorly documented.[...]
Article
Mark Brown, Auteur ; Colleen T. Downs, Auteur ; Steven D. Johnson, AuteurIt has recently been recognized that flowers pollinated by generalist opportunistic nectarivores tend to have different nectar properties to those pollinated by specialist nectarivores (including both hummingbirds and specialist passerines). Whi[...]
Article
Mark Brown, Auteur ; Colleen T. Downs, Auteur ; Steven D. Johnson, AuteurExperiments to determine sugar preferences of nectarivorous animals have been conducted using a wide variety of experimental procedures, all of which aim at ensuring that the solutions offered in choices are "equivalent". Each method used histor[...]
