Darwinian fitness and reproductive power: reply to Kozlowski

Article Abstract:

Kozlowski's criticism of Brown, Marquet, and Taper's (BMT) definition of energetic concept of fitness is incorrect. Kozlowski's definition of the measure of fitness is founded the on wrong assumptions that energy content is constant because fitness is clearly a rate. Kozlowski also claims that no explanation is provided regarding BMT's assumption on body size as a measure of fitness, but he too does not provide explanation for his assumption on mortality rate and body mass. Lastly, Kozlowski criticizes the equation BMT used but he, too, failed to explain the calculations he made.

Energy metabolism

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Signaling of need between parents and young: parent-offspring conflict and sibling rivalry

Article Abstract:

A model study of two young in a brood competing for limited resources shows that the parents obtain information about what is required in the way of basic resources through an evolutionary stable signaling system. Costly signaling is necessary for stability. The offspring try to obtain more parental resources than the parent can offer resulting in a reduced reproductive capacity of the parents. The levels of solicitation of brood mate changes with the change in the food requirements of the offspring.

Social aspects, Behavior, Mammals, Parent and child, Parent-child relations

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"Terminal investment" and a sexual conflict in the collared flycatcher (Ficedula albicollis)

Article Abstract:

The notion in life-history theory that reproductive effort increases with increasing age when senescence reduces the expectation of future reproduction was investigated in collared flycatchers (Ficedula albicollis). The correlation of feeding rate with daily energy expenditure and with female weight loss during the nesting season were compared in old and middle-aged birds. The results proved that reproductive effort increases with age.

Birds, Muscicapidae, Flycatchers, Animal reproduction

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