Selection for synchronous breeding in the European starling

Article Abstract:

The breeding synchrony of colonial birds in the European starling is studied. The early seasonal decline is caused by selection for synchronous fledging permitting the immediate formation of flocks after fledging and the late seasonal trends are by either population differences in female quality or deteriorating conditions for raising young.

Europe, Animal breeding

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Geographical variation in offspring size effects across generations

Article Abstract:

Offspring size is thought to strongly affect offspring fitness and many studies have shown strong offspring size and fitness relationships in marine and terrestrial organisms. Offspring size effects can be highly variable among populations and organisms can adapt to local conditions without changing the size of their offspring.

United States, Environmental aspects, Marine fauna, Marine animals

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Limiting factors and population regulation

Article Abstract:

Dynamics of six Tribolium confusum populations growing in the laboratory on constant but different food supplies are presented. Since the level at which the populations stabilize is directly related to the quantity of food, it is suggested that these Tribolium populations were being limited by food.

Food chains (Ecology), Food chains, Flour beetles, Population regulation (Biology)

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