Long-term Real-time Monitoring of the Ganges River Dolphins using Integrated Observation System wire Multiple Acoustic Arrays

摘要

Targeting 13 Ganges river dolphins which includes calves from Kamavas to Narora, the world's first long-term real-time monitoring using the integrated observation system has been started from 12th November 2008 for 4 months. The monitoring using the main array system has been continued ever since then. The Gauges river dolphins' real-time undrwater 2-D movements around the array area have been monitored on the PCs with appropriate viewer program through the host server anywhere in the world since November 2008. From the initial analysis results of the obtained data recorded from 13th November to 13th December 2008 and the following visual serve5, by WWF India. it is esttmated that the area 40 to 60 meters downstream from the main array is utilized by the dolphins as a calf-rearing place or nursery. Their uaderwater behavior during the calf-rearing period is successfully estimated too. It is estimated that the calves mostly stay at the area and adults periodically come to take care of them during the calf-rearing period. It suggests that adults do not swim always together with their calves but keep them at the selected area during their calf-rearing period.