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Neotropical mixed-species bird flocks in a community context.
Jenny Muñoz1, Jill E Jankowski1
1Biodiversity Research Center and Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4.
Summary
Mixed-species flocks in the Neotropics exhibit restricted ecological strategies, primarily comprising small insectivorous birds. These avian assemblages occupy a limited functional trait space compared to the broader bird community.
Area of Science:
- Ecology
- Ornithology
- Community Ecology
Background:
- Mixed-species flocks are vital in Neotropical bird communities, yet their unique ecological roles and responses to environmental gradients remain unclear.
- Understanding the functional attributes of these flocks is crucial for comprehending avian community structure and dynamics.
Purpose of the Study:
- To investigate the functional traits of mixed-species flocks across a 3000 m elevational gradient.
- To compare the functional trait space of flocking species with the broader avian community and non-flocking species.
Main Methods:
- Employed a trait-based approach to analyze avian functional diversity within mixed-species flocks.
- Examined trait variation across an elevational gradient to understand ecological strategies of flocking and non-flocking species.
Main Results:
- Flocking species and the overall avian community share similar ecological strategies across elevations.
- Flocking species occupy a significantly restricted functional trait space (51%) compared to the entire avian community.
- Trait space for flocks is concentrated among small-bodied invertivores in lower forest strata, indicating high niche packing.
Conclusions:
- Mixed-species flocks in the Neotropics represent a functionally distinct subset of the avian community.
- The restricted trait space suggests high niche overlap or finely divided niches among flocking species, potentially increasing predation vulnerability.
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