Egretta garzetta as a bioindicator of environmental pollution in Tai Lake region

摘要: There were four species of Ardeidae in Tai Lake. The dominant vegetations the habitat Pinus massoniana, Cinnamomum hupehanum, Quercus acutissema, Ulmus prmila and Myrica rubra, which suitable for Egretta garzetta to make nests. area was about 7 hm2, where there totally 4200 nests with density 0.38 nest per tree average. Studies on breeding ecology showed that incubating time 19-21 days, average egg weight 23.9 +/- 4.0 g(n = 41), size 44.5 4.1 mm x 32.6 4.9 mm(n 41). mean clutch brood 5.02(2-8) 3.86(2-7), respectively, hatching rate 84.25%. measurements nestling tarsus did not show any asymmetry (P > 0.05). fed mainly small fish shrimps analysis results Lake samples pollutants including HCH, HCB, cyclodience, DDTs (DDT, DDE DDD), PCBs, Cr, Hg Pb eggs detected except Cd, these accumulated through prey chain from sediments preys nestlings. Comparing those Poyang as relatively unpolluted area, only concentration residues higher than 2 micrograms.g-1 both lakes, other like organochlorine insecticides, PCBs heavy metals all lower Lake, affect development success at present.