Habitat features influence oviposition site selection in the Indian goldenback frog Indosylvirana indica in the Western Ghats of India
摘要
Oviposition site selection can influence offspring survival and can thus affect adult fitness. Although oviposition site selection has important conservation implication, what factors influence oviposition site selection in many species of amphibians remain unknown. Here, we investigate whether habitat and microhabitat features influence oviposition site selection in Indosylvirana indica, a stream-dwelling ranid frog that is endemic to the central Western Ghats of India. We tested for non-random selection of oviposition sites by sampling three streams in Sirsi taluk of Uttara Kannada district, Karnataka and comparing the habitat and microhabitat features of 64 plots with egg clutches and 91 plots without egg clutches. We show that I. indica preferentially select sites in the stream adjacent to forested patches compared to plantations or agricultural fields. We also show that some factors such as water depth, distance from the stream edge and water temperature has a significant effect on oviposition sites selections, while other factors such as water velocity and substrate composition did not have any significant effect. Overall, we show that oviposition site selection in I. indica is non-random and females prefer to lay eggs in warmer shallow waters away from the stream margins in regions of the stream adjacent to forested areas.