Linear and Branched Perfluorooctane Sulfonate Isomer Patterns in Herring Gull Eggs from Colonial Sites Across the Laurentian Great Lakes

2010 ◽  
Vol 44 (10) ◽  
pp. 3739-3745 ◽  
Author(s):  
Wouter A. Gebbink ◽  
Robert J. Letcher
Keyword(s):  
Great Lakes ◽  
Perfluorooctane Sulfonate ◽  
Laurentian Great Lakes ◽  
Herring Gull

Spatial and temporal comparisons of legacy and emerging flame retardants in herring gull eggs from colonies spanning the Laurentian Great Lakes of Canada and United States

2015 ◽  
Vol 142 ◽  
pp. 720-730 ◽  
Author(s):  
Guanyong Su ◽  
Robert J. Letcher ◽  
Jeremy N. Moore ◽  
Lisa L. Williams ◽  
Pamela A. Martin ◽  
...  
Keyword(s):  
United States ◽  
Great Lakes ◽  
Flame Retardants ◽  
Laurentian Great Lakes ◽  
Herring Gull

Spatial and temporal differences in the diet of Great Lakes herring gulls (Larus argentatus): evidence from stable isotope analysis

1999 ◽  
Vol 56 (2) ◽  
pp. 323-338 ◽  
Author(s):  
Craig E Hebert ◽  
J Laird Shutt ◽  
Keith A Hobson ◽  
DV Chip Weseloh
Keyword(s):  
Stable Isotope ◽  
Great Lakes ◽  
Lake Erie ◽  
Trophic Position ◽  
Isotope Analysis ◽  
Laurentian Great Lakes ◽  
Larus Argentatus ◽  
Herring Gull ◽  
Herring Gulls ◽  
Egg Formation

Stable nitrogen (δ15N) and carbon (δ13C) isotope values were measured in lipid-free homogenates of herring gull (Larus argentatus) eggs collected from the Laurentian Great Lakes during 1974-1995. δ15N values provided an indication of adult gull trophic position during egg formation. After adjustment of egg δ15N values for interlake differences in baseline food web δ15N signatures, significant differences in gull trophic position were found among colonies. These results were attributed to differing proportions of fish in the diets of gulls from the various colonies. Aquatic foods available to gulls had greater δ15N values than terrestrial foods. δ13C measurements provided some support for our hypothesis that terrestrial foods, particularly garbage, were more enriched in 13C than aquatic foods. As the proportion of fish in the diet decreased, the fraction consisting of terrestrial food increased, resulting in an increase in δ13C values and a decline in δ15N values. Stable isotope values for gull eggs from Lake Erie changed significantly during the study period and may have reflected a decline in fish availability.

Novel Methoxylated Polybrominated Diphenoxybenzene Congeners and Possible Sources in Herring Gull Eggs from the Laurentian Great Lakes of North America

2011 ◽  
Vol 45 (22) ◽  
pp. 9523-9530 ◽  
Author(s):  
Da Chen ◽  
Robert J. Letcher ◽  
Lewis T. Gauthier ◽  
Shaogang Chu ◽  
Robert McCrindle ◽  
...  
Keyword(s):  
North America ◽  
Great Lakes ◽  
Laurentian Great Lakes ◽  
Herring Gull
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