www.mampam.comFrogs of Coorg from mampam.com: Microhyla rubra type 2


Microhyla rubra
Type I (WG5609) Type II(WG5610)
Two forms of M.rubra were recognised on the basis of size, pattern and calls - see
Chapters 7 and 11. However for most analyses the two forms were grouped together. This
microhylid was the most abundant frog on Luckunda estate, found at all sites and often
in densities of over 20 per m2 at Site 1. Both types could be heard calling together but at
some sites only the large microhylid was found calling in abundance. These frogs were
also found in the coffee plantation and sacred grove not clustered around water. Although
typically a ground dwelling species, individuals were also frequently found up to 40cm
above the ground on the stalks and branches of understorey vegetation. Many pairs were
found in amplexus both on the ground and in the water, sometimes submerged. Not
enough information was gathered to determine whether there were morphological
differences between the tadpoles of the two types. The egg masses are laid in a flat
transparent sheet-like mass on the surface of shallow water. Towards the end of the study
many tiny metamorph microhylids were found. It is possible that one of these forms is
identical to a recently described Microhyla species from Karnataka . Kanamadi et
al. (1994) described courtship, amplexus and the advertisement call of M. rubra, which
bears closest resemblance to our (larger) Type 2.

Call of Type 2








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Microhyla rubra type 2

The advertisement call is made from the ground, usually in grassy areas close to water. The call has a dominant/fundamental frequency of 1.29kHz with another strong peak at 2.56kHz and weaker spectral sidebands at 5.52 and 11.06kHz. Most energy is between 0.81 and 2.86 kHz. The call is made up of a series of chirps with a duration of about 0.5 seconds. Each chirp contains about 15 pulses, with an average length of

0.006 seconds. The call is similar to that described by Kanamadi et al. (1994) for

M. rubra.

Call of Microhyla rubra type 2

Pulses from call of M. rubra Type 2

Power spectrum for M. rubra Type 2.


Images and text Daniel Bennett and Katie Hampson 2000

Sounds British Library of Wildlife Sounds 1998

 

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