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The article presents a study on the foraging habitat of four gull species, including laughing gulls, herring gulls, and ring-billed gulls, at the coastal-urban boundaries in New York City area. It mentions that dietary analysis was done through autopsy of the stomach contents of the four gull species. The study found that laughing and herring gulls mainly foraged from marine foods while ring-billed gulls were generalists.

The presence of seabirds was related to offshore surface eddies and the freshwater plume of the Mississippi River in the northern Gulf of Mexico during autumn, winter, spring, and summer 1992–1993. Skuas (Stercorarius spp.) were the most common bird seen in autumn, whereas skuas and gulls (Larus spp.) were the most common in winter. Few birds were seen in the spring, and terns (Sterna spp.) were the most common birds seen in late summer. During summer, terns were associated with the freshwater plume of the Mississippi River. In the winter, herring (Larus argentatus) and laughing gulls (L. artricilla) were associated with areas with steep thermoclines, while pomarine skuas (Stercorarius pomarinus) were found in areas of low productivity. Herring and laughing gulls in the winter, all birds in the spring, and terns in the summer were more common outside eddies. Only pomarine skuas in the winter were seen more commonly inside warm-core eddies. [ABSTRACT FROM PUBLISHER]