You are not currently logged in.
Access JSTOR through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Antipredator Defenses Influence the Distribution of Amphibian Prey Species in the Central Amazon Rain Forest
Jean-Marc Hero, William E. Magnusson, Carlos F. D. Rocha and Carla P. Catterall
Vol. 33, No. 1 (Mar., 2001), pp. 131-141
Published by: Association for Tropical Biology and Conservation
Stable URL: http://www.jstor.org/stable/2663771
Page Count: 11
You can always find the topics here!Topics: Tadpoles, Fish, Predators, Bodies of water, Species, Predation, Amphibians, Ponds, Biomass, Tropical rain forests
Were these topics helpful?See something inaccurate? Let us know!
Select the topics that are inaccurate.
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
The high diversity of amphibians in the central Amazon Rain Forest allowed us to examine the influence of tadpole antipredator defenses on assemblage structure and composition within bodies of water (α diversity) and among aquatic sites (β diversity) at a local scale. During a three-year study of tadpole assemblage composition, we found that the anuran community used a variety of bodies of water for reproduction; these ranged from streams and streamside ponds to isolated forest ponds. The distribution of several tadpole species was negatively related to fish density, while other species coexisted with high densities of fish. Tadpole size did not ensure survival against fish, and few tadpoles avoided fish by hiding in the leaf litter. Controlled predation experiments using a single tadpole species in a no-choice situation were conducted over 24- to 48-hour periods. Nearly all species of tadpoles that occurred in habitats with high fish densities were unpalatable to fish (except Centrolenella oyampiensis), indicating that unpalatability is a major adaptation allowing tadpoles and fish to coexist in this system. Unpalatability (to fish), however, was not an effective antipredator defense against odonate larvae, the other major tadpole predator in this system. The combination of predation pressure and the antipredator traits exhibited by individual species largely determined the composition of tadpole assemblages in individual bodies of water (α diversity). The heterogeneous distribution of predators among bodies water and the diversity of antipredator defenses exhibited by larval amphibians facilitated high diversity in this community (β diversity).
Biotropica © 2001 Association for Tropical Biology and Conservation