Repeatability in laying date and its relationship to individual quality for common murres

Article Abstract:

A study of the repeatability and annual fluctuation in the laying date and the productivity of color-banded female Common Murres reveals differences amongst individual females in their laying dates in comparison to the annual population mean. It also shows a high degree of repeatability in laying individual dates. Repeatability is calculated as 0.204 when the El Nino year of 1992 is left aside. Chick survival is considerably less for females which are regularly late compared to other members of the population and for females that laid late within each season.

Eggs, Eggs (Biology), Incubation, Animal colonies, Colonial animals

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Effect of implanted satellite transmitters on the nesting behavior of Murres

Article Abstract:

Abdominal implantations such as satellite transmitters change the nesting behavior of Murres. This was shown in a study of returns to the colony, nesting status and returns with fish of six Common Murres (Uria aalge) and 10 Thick-billed Murres (Uria lomvia) which were implanted with satellite transmitters. Ten days after implantation, 10 of 11 control birds and six of 16 implanted birds were seen again at the colony. Of those that returned, seven out of 10 control birds retained their breeding status while no implanted bird retained theirs.

Sexual behavior, Physiological aspects, Nest building, Radio transmitters

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Seasonal movements and pelagic habitate use of murres and puffins determined by satellite telemetry

Article Abstract:

The movements of Common Murres, Thick-billed Murres and Tufted Puffins were tracked using satellite transmitters. No differences in the foraging patterns of males and females during the breeding season were detected, nor between Thick-billed and Common Murres from mixed colonies. It is concluded that previously documented contrasting population trends are due to differences in foraging conditions during the summer rather than differential mortality rates in winter.

Habitats, Birds, Puffins

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