Document Detail

Risk to breeding success of fish-eating Ardeids due to persistent organic contaminants in Hong Kong: evidence from organochlorine compounds in eggs.
MedLine Citation:
PMID:  12502075     Owner:  NLM     Status:  MEDLINE    
Eggs of two Ardeid species, the Little Egret (Egretta garzetta) and the Black-crowned Night Heron (Nycticorax nycticorax), were collected from two egretries located in the New Territories of Hong Kong with one located near the internationally acclaimed wetland reserve, the Mai Po Marshes, and the other in a remote site (A Chau). The eggs were analysed for organochlorine (OC) compounds including the DDTs, PCBs, hexachlorocyclohexanes (HCHs) and the chlordanes (CHLs). All of the OCs under investigation were detected in the eggs of both species with significantly higher levels in the Little Egret (DDTs, 560-2200; PCBs, 270-1700; CHLs, 81-470 ng g(-1) wet weight) than the Night Heron (DDTs, 210-1200; PCBs, 85-600; CHLs 59-75 ng g(-1) wet weight). The DDTs consisted mainly of DDE with levels ranging from 85% to 95% of the total. The HCHs were at about the same levels in both species (8.4-30 ng g(-1) wet weight). All of the OCs had linear concentration probability distributions on a log-normal basis which were used to evaluate exposure associated with these compounds as part of a probabilistic risk analysis. A linear dose/response relationship for the percentage reduction in the survival of young associated with DDE in eggs was developed. This probabilistic relationship was used to establish the threshold level (1000 ng g(-1) wet weight) at which there was a significant level of reduction in the survival of young above zero and the variability in DDE concentrations at this effect level. Using a threshold level of 1000 ng g(-1), the calculated Risk Quotient (RQ) had a 12.4% probability of RQ exceeding unity with the Night Heron, and 40.9% with the Little Egret. These results indicate that the DDTs in eggs would be expected to be associated with adverse effects on the survival of young of both species, particularly the Little Egret.
D W Connell; C N Fung; T B Minh; S Tanabe; P K S Lam; B S F Wong; M H W Lam; L C Wong; R S S Wu; B J Richardson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Water research     Volume:  37     ISSN:  0043-1354     ISO Abbreviation:  Water Res.     Publication Date:  2003 Jan 
Date Detail:
Created Date:  2002-12-27     Completed Date:  2003-04-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0105072     Medline TA:  Water Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  459-67     Citation Subset:  IM    
Centre for Coastal Pollution and Conservation, Department of Biology and Chemistry, City University of Hong Kong, Tate Chee Avenue, Kowloon, Hong Kong.
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MeSH Terms
Animals, Newborn
Environmental Exposure
Hong Kong
Hydrocarbons, Chlorinated*
Insecticides / adverse effects*,  analysis,  pharmacokinetics
Risk Assessment
Reg. No./Substance:
0/Hydrocarbons, Chlorinated; 0/Insecticides

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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