Size Matters: Western Ghats Frogs Adapt to Coexist
A new study reveals how body size differences among frogs in the Western Ghats enhance their coexistence.
Frogs differ in size to reduce competition.
Endemic species show significant size variation.
Microhabitat changes could threaten species.
A recent study by scientists at the Centre for Ecological Sciences, Indian Institute of Science, Bengaluru, has uncovered that closely-related frog species in the Western Ghats exhibit notable differences in body size, which aids their coexistence. The research focused on three frog genera: Nyctibatrachus, Micrixalus, both endemic to the region, and the more widely distributed Hylarana. The findings suggest that competition and species sorting play a crucial role in determining which species can thrive together in shared habitats.
The study revealed that stream-dwelling frogs, particularly the endemic Nyctibatrachus and Micrixalus, displayed significant body-size assortment. For instance, among 27 groups of three Nyctibatrachus species, 23 groups consisted of species from different body-size classes. This pattern was absent in Hylarana, indicating that the evolutionary adaptations of Nyctibatrachus and Micrixalus to their environments have led to a separation that facilitates coexistence. The research highlights the importance of microhabitat preferences, with larger frogs occupying faster-flowing waters, while smaller ones prefer calmer edges, allowing them to share the same ecosystem without direct competition.
