Beta Diversity and Community Structure of a Neotropical Anuran Assemblage (Pacaya-Samiria Reserve, Peru)

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Many communities are thought to follow assembly rules, such that nonrandom co-occurrence patterns indicate competitive interactions among species. The richness of these local communities is influenced by richness at broader spatial scales. Here we use null models to quantify relationships among co-existing species of Anurans at multiple scales along the Samiria River in the Peruvian Amazon. We hypothesized that species would co-occur less often than expected by chance. We also hypothesized alpha (α) diversity would be lower than expected by chance, while beta (β) diversity would be higher. We surveyed during both daytime and nighttime within two habitat types: 8 seasonally-flooded forest sites, and 2 riverine sites with aquatic vegetation. Upon detection of a specimen we identified it to species. We partitioned diversity among sites within a habitat type (β­­1), and among habitat types (β­­2).


Presented at the 98th Ecological Society of America Annual Meeting, Minneapolis, MN.

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