NDLI: Recent impact of DDT contamination on Black Stork eggs

Content Provider	Springer Nature Link
Author	Strazds, Māris Bauer, Hans Günther Väli, Ülo Kukāre, Agnese Bartkevičs, Vadims
Copyright Year	2015
Abstract	The contamination with DDT (1,1,1-trichloro-2,2-bis(4-chlorophenyl)ethane) and its breakdown products as a potential cause of population decline of Black Stork has been studied in Latvia since 2008. In order to test if contamination is local or widely distributed we collected failed eggs from nests also in Estonia, Belarus, Poland, Czech Republic, Germany and Belgium. DDT or its breakdown products were found in all analysed eggs. The ratio of p,p′-DDT as a proportion of all DDT products increased during the years of our research. Since the Black Stork has so far not been mentioned as a species affected by DDT we do not have information about its critical contamination effect levels. However, we also present data suggesting that DDT contamination might have affected Black Stork historically. Current data suggest that the reduction of eggshell thickness has not (yet) reached the levels described as critical for other affected species. However, we found a significant reduction of egg volumes, which in turn negatively affects hatching, as eggs below a threshold size fail to hatch. The ratio of small eggs versus normal eggs has increased by almost 10 % in recent years and is strikingly higher as compared to the pre-DDT period. There is also a significant correlation between eggs of reduced size and their respective DDE (1,1-bis(4-chlorophenyl)-2,2-dichloroethene) values.
Starting Page	187
Ending Page	198
Page Count	12
File Format	PDF
ISSN	21937192
Journal	Journal für Ornithologie
Volume Number	156
Issue Number	1
e-ISSN	21937206
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-07-01
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Black Stork DDT Contamination Egg volume Eggshell thickness Zoology Ecology Fish & Wildlife Biology & Management
Content Type	Text
Resource Type	Article

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