BaptisteSchmidBiK-F

BaptisteSchmidassociatedPartyHenningNottebrockCo-ownerJörnPagelCustodian/StewardKarenEslerCustodian/StewardKatrinBöhning-GaeseCo-ownerAntonPauwCustodian/StewardFrank M.SchurrCo-ownerMatthiasSchleuningCo-owner2015-01-19We estimated the population size of Cape sugarbirds and orange-breasted sunbirds in 26 study plots (200x200m, 110x110m core zone) and visitation rates of birds of the two species (number of bird visit during 45 minutes) on 1333 focal plants of 17 Protea species (Protea burchellii, P. coronata, P. compacta, P. cynaroides, P. eximia, P. laurifolia, P. lepidocarpodendron, P. longifolia, P. lorifolia, P. mundii, P. nana, P. neriifolia, P. nitida, P. obtusifolia, P. punctata, P. repens, P. susannae). We investigated the effects of resources (standing crop of nectar sugar) provided by the Protea plants in the study sites on the avian population sizes (max. number of simoultaneous birds observed in 10min point count surveys within 30m distance from the observer) and per-plant visitation rates. We mapped all overstorey Protea plants (19 species) and estimated the temporal variation in standing crop of nectar sugar for each mapped plant.cape sugarbird promerops caferfynbos cape floristic regionorange-breasted sunbird anthobaphes violacaeplant-pollinator interactionsprotea proteaceaesouth africaObtain permission from data set owner(s)Western Cape, South Africa18.831419.5228-33.6275-34.61392012-04-102012-07-27SpeciesPromerops caferspeciesAnthobaphes violacespeciesProtea burchelliiSpeciesProtea coronataSpeciesProtea compactaSpeciesProtea cynaroidesSpeciesProea eximiaSpeciesProtea laurifoliaSpeciesProtea lepidocarpodendronSpeciesProtea longifoliaSpeciesProtea lorifoliaSpeciesProtea mundiiSpeciesProeta nanaSpeciesProtea neriifoliaSpeciesProtea nitidaSpeciesProtea obtusifoliaSpeciesProtea punctataSpeciesProtea repensSpeciesProtea susannaeBaptisteSchmidBiK-F

baptiste.schmid@alumni.ethz.ch

Avian population sizes were estimated with repeated point count survey (three point counts per study site). We used the maximal number of simoultaneously observed individuals within 30 m distance from the observer during the 10 minutes point count. Per-plant visitation rate were obtained from 45 min observation of focal plants at least 20 m from the observer. We used only legetimate foraging events (i.e. bird visit was not recorded if bird robbed nectar from the side of the inflorescence).

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