The Relative Influence of Competition and Prey Defenses on the Phenotypic Structure of Insectivorous Bat Ensembles in Southern Africa
Open Access
- 13 November 2008
- journal article
- research article
- Published by Public Library of Science (PLoS) in PLOS ONE
- Vol. 3 (11), e3715
- https://doi.org/10.1371/journal.pone.0003715
Abstract
Deterministic filters such as competition and prey defences should have a strong influence on the community structure of animals such as insectivorous bats that have life histories characterized by low fecundity, low predation risk, long life expectancy, and stable populations. We investigated the relative influence of these two deterministic filters on the phenotypic structure of insectivorous bat ensembles in southern Africa. We used null models to simulate the random phenotypic patterns expected in the absence of competition or prey defences and analysed the deviations of the observed phenotypic pattern from these expected random patterns. The phenotypic structure at local scales exhibited non-random patterns consistent with both competition and prey defense hypotheses. There was evidence that competition influenced body size distribution across ensembles. Competition also influenced wing and echolocation patterns in ensembles and in functional foraging groups with high species richness or abundance. At the same time, prey defense filters influenced echolocation patterns in two species-poor ensembles. Non-random patterns remained evident even after we removed the influence of body size from wing morphology and echolocation parameters taking phylogeny into account. However, abiotic filters such as geographic distribution ranges of small and large-bodied species, extinction risk, and the physics of flight and sound probably also interacted with biotic filters at local and/or regional scales to influence the community structure of sympatric bats in southern Africa. Future studies should investigate alternative parameters that define bat community structure such as diet and abundance to better determine the influence of competition and prey defences on the structure of insectivorous bat ensembles in southern Africa.Keywords
This publication has 49 references indexed in Scilit:
- Morphological assembly mechanisms in Neotropical bat assemblages and ensembles within a landscapeOecologia, 2006
- Changes in Community Size Affect the Outcome of CompetitionThe American Naturalist, 2005
- Support for the allotonic frequency hypothesis in an insectivorous bat communityOecologia, 2003
- Flight and echlocation in the ecology and evolution of batsTrends in Ecology & Evolution, 1997
- Species Composition and Morphological Structure of the Bat Fauna of Yucatan, MexicoJournal of Animal Ecology, 1997
- Scaling of Wingbeat and Echolocation Pulse Emission Rates in Bats: Why are Aerial Insectivorous Bats so Small?Functional Ecology, 1994
- Fly Now, Die Later: Life-History Correlates of Gliding and Flying in MammalsJournal of Mammalogy, 1994
- Feline Canines: Community-Wide Character Displacement Among the Small Cats of IsraelThe American Naturalist, 1990
- Competition and Theory in Community EcologyThe American Naturalist, 1983
- Regularity, Randomness, and Aggregation in Flowering PhenologiesScience, 1979