Importance of habitat saturation and territory quality for evolution of cooperative breeding in the Seychelles warbler

Article Abstract:

Cooperative breeding in the Seychelles warbler (Acrocephalus sechellensis), in which young warblers assist their parents in fostering new generations, is best accounted for with the 'benefits of philopatry' hypothesis. This hypothesis holds that cooperation increases the warblers' fitness by encouraging the young to stay in high-quality breeding areas. The effect of territory quality on dispersal, and the greater fitness of young warblers that reproduce in high-quality areas after helping their parents, disproves the hypothesis that habitat saturation produces cooperative breeding.

Natural history, Birds, Bird breeding, Sexual behavior in animals, Animal sexual behavior, Seychelles, Sylviidae

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Extreme adaptive modification in sex ratio of the Seychelles warbler's eggs

Article Abstract:

Adaptive sex ratios among the eggs of Seychelles warblers, Acrocephalus sechellensis, were determined via randomly amplified polymorphic DNA (RAPD)analysis of warbler broods. RAPD analysis of Seychelles warbler offspring from bird populations located in high-quality and low-quality environments indicated the presence of adaptive sex ratios that are dependent on the availability of food. Warblers in low-quality environments produce more male offspring than females to reduce competition on limited resources.

Analysis, Environmental aspects, Adaptation (Biology), Evolutionary adaptation, Bird populations, Sex ratio, Wood warblers

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Altruism and infidelity among warblers

Article Abstract:

A general linear model analysis was conducted to check the provisioning behavior of non-parent subordinates. The result shows the age, sex, number of nestling, number of subordinates and territory quality had no significant effect on behavior.

Science & research, Animal behavior, Animal behaviour

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