Proximity at birth relates to a sire's tolerance of his offspring among sooty mangabeys

Article Abstract:

A model has been developed to explain infanticide behaviour among adult male sooty mangabeys. An alpha male that was removed from his group for three months has been observed to attack an offspring six days after his return and showed aggressive behavior towards the mother and the infant thereafter. A DNA probe assay to test the paternity of the infant showed that the alpha male is its true father. These results suggest that infanticide behaviour is aroused when the male is absent during the birth of an infant.

Research, Behavior, Infanticide in animals, Animal infanticide, Mangabeys

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Reproductive behavioural sequences of single pairs of Atlantic salmon in an experimental stream

Article Abstract:

Reproductive behaviours in Atlantic salmon, Salmo salar, in a controlled flow channel have been analyzed in order to understand the sequence of events between males and females that sparks off oviposition. It was possible to identify three periods of spawning activity. There was a clear fall in female nest construction activities between the first three and the last three ovipositions. This decrease was linked with a fall in male courtship behaviour.

Sexual behavior, Atlantic salmon

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Offspring growth in the California gull: reproductive effort and parental experience hypotheses

Article Abstract:

A study of the adult feeding and foraging behavior of California gull, Larus californicus, revealed direct correlations between the amount of time spent by parents in foraging for seafood and the nature of growth of their offspring. Age-related variations in parental feeding patterns and offspring growth are attributed to factors such as increased foraging efficiency and reproductive effort with age.

Analysis, Food and nutrition, Gulls, Seafood gathering

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