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Journal of Ornithology

, Volume 151, Issue 3, pp 615–625 | Cite as

Hummingbird diversity, food niche characters, and assemblage composition along a latitudinal precipitation gradient in the Bolivian lowlands

  • Stefan Abrahamczyk
  • Michael Kessler
Original article

Abstract

As for many other taxa, hummingbird diversity declines away from the equator, but the causes for this decline are still disputed and might involve, among others, climatic factors or the availability of food resources. Because hummingbirds are one of the classical examples for plant–animal coevolution, it has been proposed that the diversity of hummingbird assemblages might depend on the diversity of food plants available. We tested this hypothesis by studying the hummingbird assemblages and their food plants for 1 year at six sites along a 660-km-long transect in Bolivian lowland forests extending from the southernmost Amazonian rain forests to dry Chaco forests. Hummingbird diversity was higher in the northern three sites as compared to the southern ones, with an abrupt decline in species numbers and a corresponding change in taxonomic composition at the boundary from evergreen to drought deciduous forests. Hummingbird diversity and abundance were only weakly correlated to climatic factors or to the diversity of humming-visited flowers, but strongly to the seasonal abundance of flowers. The overlap in nectar diet between hummingbird species depended on the number of plant species: when numerous species were available, the hummingbirds segregated by feeding preferences, but when few flowers were available, all hummingbirds fed on the same plants. We conclude that the local diversity of hummingbird species is not primarily determined by the diversity of food plants, but rather by the abundance of flowers available at any given point in time.

Keywords

Biogeography Tropics Subtropics Species richness Hummingbird communities 

Notes

Acknowledgments

We thank Yuvinka Gareca, Caroli Hamel, Sebastian K. Herzog, Steffen Reichle, Vanessa Sandoval, and Julian Q. Vidoz for their support and advice during field work as well as Dirk N. Karger and Bastian Steudel for their help during data analysis, the journal club members for constructive review, Rodrigo W. Soria Auza for providing the climatic data, Karl-L. Schuchmann for providing critical literature references, and Helge Schuirman for technical advice. We are grateful to the Botanical Garden in Santa Cruz, the University of Cochabamba, Prometa, the municipal governments of Villa Tunari and Río Seco, and Robin Clarke Gemuseus for the permission to work on their land, and to the National Herbarium at La Paz as well as the Ministry of the Environment for supporting our study. Funding was provided by the Konrad-Adenauer-Stiftung and the DFG (Deutsche Forschungsgemeinschaft). The experiments comply with the current laws of Bolivia.

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Copyright information

© Dt. Ornithologen-Gesellschaft e.V. 2010

Authors and Affiliations

  1. 1.Institute for Systematic BotanyZurichSwitzerland

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