We examine spatial and seasonal differences in contaminants in herring gulls (Larus argentatus) from Great Slave Lake and describe the relationship between trophic position and contaminant levels in herring gulls, mew gulls (L.
Stable-nitrogen isotope analysis of lipid-free egg yolk suggested a gradient in trophic levels of laying females, with black terns somewhat lower than herring gulls and Caspian terns, which were, in turn, lower than mew gulls (Fig.
Mew gulls and Caspian terns with higher [Delpta]15N values of their eggs also contained chlorinated hydrocarbon concentrations higher than those found in herring gull and black tern eggs.
The nesting biology of mew gulls (Larus canus) on Kennedy Lake, British Columbia, Canada: Comparison with mew gulls in northern Europe.
Franklin's Gull - + - Black-headed Gull - - - Mew Gull - - - Thayer's Gull B B B Iceland Gull - - + Glaucous Gull B B B Great Black-backed Gull - - + Black-legged
Phalarope - - Pomarine Jaeger + - Parasitic Jaeger - + Long-tailed Jaeger + B Great Skua - - Franklin's Gull - - Black-headed Gull - - Mew Gull - - Thayer's Gull + + Iceland Gull - - Glaucous Gull + + Great Black-backed Gull - - Black-legged
Phalarope - Pomarine Jaeger - Parasitic Jaeger - Long-tailed Jaeger B Great Skua - Franklin's Gull - Black-headed Gull - Mew Gull - Thayer's Gull + Iceland Gull - Glaucous Gull B Great Black-backed Gull - Black-legged
Phalarope + + Pomarine Jaeger + + Parasitic Jaeger B B Long-tailed Jaeger B B Great Skua - - Franklin's Gull - - Black-headed Gull + + Mew Gull + + Thayer's Gull B + Iceland Gull - - Glaucous Gull B B Great Black-backed Gull - - Black-legged