Frogs of Coorg: white spot frog Nyctibatrachus sp.
|WHITE SPOT FROG Nyctobatrachus sp.
(FS0l, WG019(metamorph) TADPOLE 8)
A small, cryptic frog most common in slow, very shallow muddy streams in sediment or
under leaves. At the cardamom plantation (site six) the white spot ranid was the most
common frog, found alongside R. temporalis, P. pseudocruciger and L.
limnocharis. Occasionally found in sacred grove among leaf litter and in the pit fall traps,
but not recorded from pitfalls in coffee plantation. A single specimen was found by the
edge of lake 1. Twenty two males had mean mass of 1.1g (+/- 0.34). Males had yellow
coloured pads on the underside of their thighs. Tadpoles faced against the flow of the
water, resting on substrate, very well camouflaged. Adults are darker on land, much
lighter in the water. Males were territorial when calling and chased other males away.
Nyctibatrachus sp (“white spot frog”) The call is made from slow slowing streams or from the banks of streams. Average length is about 1.3 seconds and is composed of about 16 chirps. The introductory chirp is a squeak consisting of a long continuous pulse with a dominant frequency of 1.59kHz and strong spectral sidebands at 3.4, 4.7, 6.1, 7.7 and 11.1 kHz. Energy is concentrated between 0.05 and 4.8 kHz. The remainder of the call has strong peaks at 1.5 and 3.7 kHz and consists of pulses grouped mainly as triplets (0.28 seconds each, 0.6 seconds apart) until they merge into single pulses of about 0.005 seconds duration towards the end of the call .
Call of Nannobatrachus
Power spectra of Nannobatrachus sp. Top is introduction, bottom is rest of the call
Images and text © Daniel Bennett and Katie Hampson 2000
Sounds © British Library of Wildlife Sounds 1998