COURTSHIP, AMPLEXUS AND ADVERTISEMENT CALL OF THE FROG, MICROHYLA-RUBRA

Microhyla rubra has a single reproductive season (April-October) in a year. Sexually mature males possess a single subgular vocal sac during breeding season. Males produce advertisement calls which are species- specific and consists of a number of calls produced in series at varia ble intervals forming a call group. Each call group comprises 8-104 ca lls. Each call is formed of a pulse group of 15-21 pulses. The frequen cy spectrum is continuous and broad. The sound energy is concentrated between 300 Hz and 3300 Hz. Gravid females are attracted by the advert isement call, and this results in axillary amplexus.