Abundance and diversity of anuran species in Danum Valley, Sabah, Borneo

Abigail Porter

Abstract


1. Anurans are important components of tropical ecosystems; however, the biodiversity of these species is under threat due to the rapid deforestation of Southeast Asian forests.
2. Abundances and numbers of individuals of anuran species from three different sites were surveyed. One site being that of a relatively undisturbed primary Dipterocarp forest, the other two being disturbed habitats, a secondary forest recovering from logging and a drainage ditch which has formed a pool site.
3. Species abundance and numbers of individuals was significantly different P<0.05 between the three sites. The primary forest site showed higher mean abundances of species and individuals of anuran species, with the secondary forest having the lowest abundances and the pool site having an intermediate value.
4. Variables of temperature and light levels were shown to have an impact upon frog species, with the highest temperatures and light readings found in the sites with less species and individuals. pH was neutral for all three sites so was not seen as a consequence effecting anurans.
5. The differences in anuran abundances and species in the three sites may indicate that environmental factors may be having detrimental impacts on anurans.
6. The need to census amphibians has never been more urgent than it is now. Among herpetologists, there is a growing awareness that amphibians are declining and becoming extinct in many parts of the world.

Key- words: Anurans, deforestation, detrimental impacts, Southeast Asia.

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