Importance of big pollinators for the reproduction of two Hypericum species in Cameroon, West Africa

0308473 - BÚ 2008 RIV GB eng J - Journal Article
Janeček, Štěpán - Hrázský, Záboj - Bartoš, M. - Brom, J. - Reif, J. - Hořák, D. - Bystřická, D. - Riegert, J. - Sedláček, O. - Pešata, M.
Importance of big pollinators for the reproduction of two Hypericum species in Cameroon, West Africa.
[Význam velkých opylovačů pro reprodukci dvou druhů rodu Hypericum v Kamerunu, západní Afrika.]
African Journal of Ecology. Roč. 45, č. 3 (2007), s. 607-613. ISSN 0141-6707. E-ISSN 1365-2028
R&D Projects: GA AV ČR IAA601410709; GA AV ČR KJB601110703; GA MŠMT LC06073
Institutional research plan: CEZ:AV0Z60050516; CEZ:AV0Z60870520
Keywords : sunbirds * Hypericum * floral traits
Subject RIV: EF - Botanics
Impact factor: 0.688, year: 2007

Two woody Hypericum species (H. roeparianum and H. revolutum) often coexist in forest edge and stream mantle communities in the Bamenda-Banoso Highlands, Cameroon. Morphologically nonspecialized flowers of both species are visited by specific eye-catching visitors. Nectarless flowers of H. roeparianum are visited by a large carpenter bee Xylocopa sp. (Hymenoptera) and nectar-producing flowers of H. revolutum are the main source of nectar for sunbirds (Cyanomitra oritis, Cinnyris reichenowi and C. bouvieri). Using a manipulative experiment, we showed that the carpenter bee plays an important role in the reproduction success of H. roeparianum, whereas sunbirds affect seed production of H. revolutum only little. We suggest that a clear differentiation of pollination niches enables the coexistence of both Hypericum species. The study showed that the pollination system of H. roeparianum with morphologically nonspecialized flowers can be ecologically specialized.

Dvě třezalky s podobnými květy dokáží separovat své niky. Ačkoli je nektar druhu Hypericum revolutum jeden z hlavních zdrojů strdimilů nemají vliv na jeho reprodukční úspěšnost. Morfologicky nespecializované květy mohou být ekologicky specializovány.
Permanent Link: http://hdl.handle.net/11104/0160949