Interpreting temporal trends in Great Lakes organochlorine levels: Results from the herring gull surveillance program

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:201233

Hebert, C E; Shutt, J L; Norstrom, R J ^[1]; Weseloh, D V ^[2]

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1. Canadian Wildlife Service, Hull, Quebec (Canada). National Wildlife Research Centre
2. Canadian Wildlife Service, Burlington, Ontario (Canada)

The Canadian Wildlife Service`s herring gull (Larus argentatus) surveillance program has demonstrated the utility of this species as a monitor of spatial and temporal trends in Great Lakes contaminant levels. Organochlorine concentrations in herring gull eggs decreased significantly in the 1970s and early 1980s as a result of control measures. Since the mid-1980s, however, concentrations of many compounds have been relatively constant. In addition, periodic fluctuations in egg contaminant concentrations hamper the ability to interpret more recent temporal trends in organochlorine levels. To evaluate the progress towards achieving the virtual elimination of organochlorines from the Great Lakes the authors must improve their understanding of the factors which regulate organochlorine bioaccumulation. This is particularly important for those species which have been selected as key indicators of ecosystem contamination, such as the herring gull. The goal of this paper is to examine some of the factors which may be responsible for the temporal fluctuations in herring gull egg contaminant concentrations. The regulation of contaminant bioavailability and transfer by changes in weather patterns and food web dynamics will be examined.

• OSTI ID: 201233
• Report Number(s): CONF-9511137--; ISBN 1-880611-03-1
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
56 BIOLOGY AND MEDICINE
APPLIED STUDIES
BIOLOGICAL ACCUMULATION
BIOLOGICAL AVAILABILITY
BIOLOGICAL INDICATORS
BIRDS
ECOLOGICAL CONCENTRATION
FOOD CHAINS
GREAT LAKES
ORGANIC CHLORINE COMPOUNDS
SENSITIVITY
WATER POLLUTION