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Muggers in VadodaraR. VyasImage 1. Map of the study area: Vishwamitri River stretch and Vadodara City.were done during January 2010 following Choudhary& Rao (1982) and De Vos (1982). Basking animalswere counted from vantage points on the river bankduring mid-day using a pair of binoculars (8x40). Sizeclass of the Muggers, shore and river bank features andriver conditions were assessed visually. Mugger counts3334Journal of Threatened Taxa | www.threatenedtaxa.org | November 2012 | 4(14): 3333–3341
Muggers in Vadodaraduring night were done using a search light. Thesecounts were carried out in the last week of January2010 involving the staff of Gujarat Forest Departmentand volunteers of a few local non governmentalorganizations (Appendix 2). Prior to initiating thesecounts, an orientation routine was conducted for allteam members briefing them on methodology. Mostof the Muggers were recorded following eye reflection.Data such as size, habitat type, water quality, riverside features, and anthropogenic activities in the areawere recorded visually and man-animal conflicts wererecorded opportunistically.Burrow count: Mugger burrows were locatedmanually during November 2008–January 2009.Burrows were categorised as active and inactive(abandoned) based on signs during repeated surveys.ResultsMugger count 2008–09: Counts of Muggersduring the day were carried out from the last week ofDecember 2008 to January 2009. In total, 81 Muggerswere counted within the 25km stretch of the riverstudied. This included 14 juveniles, 24 subadults and43 adults (over two meters). Data on Mugger countsat each section of the river and size class are given inTable 1. The highest of 36 Muggers was observed inriver Section-2.Mugger count 2010: During the night count, a totalof 155 Muggers were observed, which included 78adults. Section wise counts and size of Muggers areR. Vyasgiven in Table 1.Burrows count: In total, 40 burrows of Muggerswere observed during November 2008–January 2009,including 25 on the left bank and the rest on the rightbank of the river. Among them, 36 burrows wereactive (Table 2). The highest of 27 active burrowswere observed in Section-3. Only two burrows wererecorded in Section-4, the down-stream of the river.A River Front Project was initiated during 2009 bythe Vadodara Municipal Corporation. In the first phase,the river banks were cleared and widened to facilitatethe flow of water. Due to this, about 25% of burrowsgot blocked with loose soil. However, it was observedthat within a few weeks the Muggers had excavatednew burrows nearby.Food and feeding: It was found that Muggersactively foraged nocturnally (dusk to dawn). Duringthe study, Muggers were observed feeding on eightTable 2. Numbers of burrows observed in study area, RiverVishwamitri.Section no.Number of BurrowsRight Bank Left Bank TotalUsed +Unused = TotalUsed +Unused = TotalUsed +Unused= TotalSection-I 0 + 0 =00 3 + 2= 05 3 + 2 = 05Section- II 1 + 0 = 01 03 + 0 = 03 04 + 0 = 04Section- III 13 +1 =14 14 + 1 = 15 27 + 2 = 29Section- VI 0 + 0 = 00 02 + 0 = 02 02 + 0 = 02Total 14+ 1= 15 22 + 3= 25 36 + 4 = 40Table 1. The Vishwamitri River section and count of Mugger Crocodylus palustrisA - survey result December2008–January 2009Riverlength(km)The riversectionJuvenilemNumbers of AnimalsSub-adultAdultBig-size
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November 2012 | Vol. 4 | No. 14 | P
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