Bioindication of organochlorine pesticides by night heron in Taihu wetland ecosystem

Abstract

Abstract: Based on field ecological investigation on the colony of herons in Yuantouzhu of Taihu in1999, the regugitated foods by chicks of night heron were collected for prey type identification and chemical analysis.Besides,eggs of night heron,and sediments and waters in foraging habitats were sampled for chemical analysis as well.α-HCH,β-HCH,γ-HCH,Aldrin,Dieldrin,Endrin,Heptachlor,Heptachlor epoxide,p,p'-DDE,p,p'-DDD,o,p'-DDTand p,p'-DDTwere determined in laboratory by gas chromatography.The results indicated that HCHisomers,DDTand its metabolites could be detected in various environments and preys of night heron,although the organochlorined chemicals were banned for almost 20 years.Moreover,The results showed that eggs of night heron could accumulate organochlorine pesticides by as much as a factor of 10³～10⁴,which can make chemical analysis much easier.So they are good bio-indicators for organochlorine contamination level in wetland environments.

Key words: Night heron, Organochlorine pesticides, Food chain

CLC Number:

X171

DONG Yuanhua, An Qiong, GONG Zhongming, WANG Hui . Bioindication of organochlorine pesticides by night heron in Taihu wetland ecosystem[J]. Chinese Journal of Applied Ecology, 2002, (2): 209-212.

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