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Organochlorines, mercury, and selenium in great blue heron eggs from Indiana Dunes National Lakeshore, Indiana

Journal of Great Lakes Research

Out-of-print
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Abstract

In 1993, 20 great blue heron (Ardea herodias; GBH) eggs (one per nest) were collected from a colony at the Indiana Dunes National Lakeshore, Indiana (INDU). The eggs were artificially incubated until pipping and were then analyzed for organochlorines, mercury, and selenium. Livers of embryos were analyzed for hepatic microsomal ethoxyresorufin-O-dealkylase (EROD) activity. Brains were measured for asymmetry. Egg-laying began in early April and the mean clutch size was 4.2 eggs per clutch. Organochlorine concentrations were generally low (geometric mean p,p'-DDE = 1.6 I?g/g wet weight; polychlorinated biphenyl [PCB] = 4.9 I?g/g); however, one egg had elevated concentrations of p,p'-DDE (13 I?g/g) and PCBs (56 I?g/g). EROD activity in the embryos analyzed from INDU was not elevated. The frequency (11%) of brain asymmetry was low. Eggshells averaged 3.4% thinner than eggshells collected prior to the use of DDT. Mercury (geometric mean = 0.9 I?g/g dry weight) concentrations in GBH eggs were within background levels. Selenium (4.0 I?g/g dry weight) concentrations in eggs were above background levels, but below a concentration threshold associated with reproductive impairment.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Organochlorines, mercury, and selenium in great blue heron eggs from Indiana Dunes National Lakeshore, Indiana
Series title:
Journal of Great Lakes Research
Volume
24
Issue:
1
Year Published:
1998
Language:
English
Contributing office(s):
Great Lakes Science Center
Description:
p. 3-11
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
3
Last page:
11
Number of Pages:
8