Early growth as an index of parental quality

Article Abstract:

Parental quality is the prime determinant of early growth and survival of Roseate Tern chicks, manifested at the time of egg-laying and most of it expressed during the first three days of life. This was concluded following a measurement of the growth of Roseate Tern chicks at a Connecticut colony from 1987-1996. None of the other variables measured, including egg mass, hatching asynchrony, parental age, female-female pairing, or trapping, substantially contributed to explaining later growth or survival.

Growth, Terns, Growth (Physiology), Chicks, Chicks (Infant chickens)

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Golden eagle predation on experimental sandhill and whooping cranes

Article Abstract:

Experiments to develop techniques that could lead to the re-establishment of a breeding population of whooping cranes in the Prairie Provinces of Canada included migration by ultralight aircraft and by truck. During the experiments, it is shown that predation by golden eagle is a serious threat to migrating cranes. Most attacks occured while birds were in flight following motorized vehicles.

Predation (Biology), Birds, Bird migration, Whooping crane, Sandhill crane

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Post-release survival of hand-reared and parent-reared Mississippi Sandhill cranes

Article Abstract:

The survival rates of 56 hand-reared and 76 parent-reared Mississippi Sandhill Crane chicks released during their first winter, were compared. First year survival was 80% and hand reared cranes survived better than parent-reared birds. Mixing improved survival the most for parent-reared birds released with hand-reared birds.

Bird populations, Cranes (Birds)

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