ANURAN DISTRIBUTION AND RICHNESS IN A TROPICAL MONTANE FOREST IN MONTEVERDE, COSTA RICA - AN UPDATED SURVEY

Taryn E Cornell; University of California, San Diego; tecornell2@gmail.com; Federico A. Chinchilla, Frank J. Joyce

Montane ecosystems support high endemism and biodiversity. As Neotropical communities encounter climactic pressures, measuring species richness and abundance across an elevational gradient provides insight into their responses. Amphibians (Order: Anura) are uniquely sensitive to environmental change and are experiencing severe declines globally. In this study, Anuran surveys were conducted across four distinct Holdridge life zones in Monteverde, Costa Rica, to compare with a corresponding study in 2019. Visual encounter surveys (VES) and audio encounter surveys (AES) methodologies were used at five non-continuous locations. Data from 134 individuals across 17 species was collected during May 2023. Fewer species were encountered as elevation increased, as expected. An analysis of observed species’ zonal distributions revealed two species (C. bransfordii, C. stejnegerianus) outside and upslope of their expected Holdridge life-zones based on recent species distribution guides. A high variability in precipitation was observed, consistent with decades of climate change data. Our results did not indicate a significant difference in Anuran community composition related to precipitation. This study demonstrates the necessity for sustained, long-term collection of amphibian data in biodiversity hotspots. In turn, a cohesive understanding of community responses can inform conservation efforts.

Poster Session   Student Paper