Breeding biology of the Dolphin Gull at Punta Tombo, Argentina

Article Abstract:

A study of Dolphin Gulls (Larus scoresbii) conducted between 1985 and 1990 at Punta Tombo, Argentina, indicates that their atypical breeding habits are affected by vulnerability to predation and scavenging habits. Location of the colonies changes from year to year. The nest density is high, with clutches generally having two eggs. Incubation time is 24 to 27 days, and the chicks hatch from mid to late Dec. Chicks leave the nesting area within 2-5 days after hatching. Dolphin Gulls are scavengers during the breeding season and eat sea lion excrement and food dropped by Magellanic Penguins and Imperial Cormorants while feeding their young ones.

Argentina, Natural history, Birds, Animal reproduction

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Spatial and temporal patterns in the diet of the Kelp Gull in Patagonia

Article Abstract:

Kelp Gulls in central coastal Patagonia, Argentina, are generalist and opportunistic foragers. They eat a wide range of prey, mostly marine invertebrates and fish. It was found that Kelp Gulls in northern Chubut feed throughout the season, mainly on intertidal invertebrates. Fish are also a significant element of the Kelp Gull's diet, mostly during the chick stage. Kelp Gulls can be significant predators of eggs and chicks of other marine and coastal birds, but the percentage of occurrence of this food type in this research was not large.

Food and nutrition

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Satellite tracking of Magellanic Penguin migration

Article Abstract:

A study was conducted to examine the migration patterns of four male Magellanic Penguins from their winter migration at Punta Tombo, Argentina. Satellite transmitters and Wildlife Computer devices were utilized to track the penguins after they finished molting at a penguin colony in Punta Tombo. Results indicated that the location of the penguin migration route and travel rate are correlated with the seasonal movement of prey.

Behavior, Animal migration, Penguins

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