Reptiles Mysteriously Declining Alongside Amphibians

| Mon Apr. 16, 2007 6:36 PM EDT

The catastrophic declines in frog and salamander populations may be spreading to reptiles. New Scientist reports that scientists reviewed data on ground-dwelling reptiles and amphibians collected over the past 35 years at La Selva Biological Station in Costa Rica, finding a 75-percent decline in both reptiles and amphibians in native forest since 1970. The numbers of both increased in abandoned cacao plantations, by 4% annually for amphibians, and 2.7% per year for reptiles. Fungal diseases or pesticide contamination, blamed for amphibians' decline elsewhere, are unlikely to be behind the declines at La Selva, since they would affect abandoned plantations as well as native forest. The researchers suggest the cause may be a warmer, wetter climate that stunts tree growth, and reduces the leaf litter, where reptiles and amphibians live. --Julia Whitty