Interactions between the spatial and temporal clumping of food affect the intensity of aggression in Japanese medaka

Article Abstract:

An animal's opportunity for aggression must be considered in tests of the resource defense theory. In previous studies, only one aspect of resource distribution at a time has been manipulated, affirming predictions that aggressiveness increases as clumping of resources increases in space but decreases as temporal clumping increases. A significant interaction between the effects of the spatial and temporal clumping of food in the Japanese medaka fish Oryzias latipes on the total rate of aggression in tanks and on the per capita rate of aggression in the feeding patch.

Behavior, Resource partitioning (Ecology)

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Operational sex ratio, mediated by synchrony of female arrival, alters the variance of male mating success in Japanese medaka

Article Abstract:

A study was conducted to determine the relationship between competition and sexual behaviour in the male and female Japanese medaka. The aggressive behavior of males and monopolization behaviour of females were analyzed by placing new females inside the tank synchronously and asynchronously. The results showed that mating success was higher in the asynchronous and that the success of males was determined by their persistence and ability to pursue the females. There were no evidences to support the positive relationship between mating success and aggression.

Sexual behavior, Sexual behavior in animals, Animal sexual behavior, Competition (Biology)

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Resource defence, monopolization and variation of fitness in groups of female Japanese medaka depend on the synchrony of food arrival

Article Abstract:

Food is economically defendable in animals only when there is an asynchronous arrival of food. The study on a group of four female medaka, Oryzias latipes, shows that the variation of within-group fitness is greater in the asynchronous treatment than in synchronous. There is a positive correlation between frequency of aggression by an individual with feeding success and ultimately to fitness in the asynchronous treatment but is not correlated with either in the synchronous treatment.

Analysis, Food and nutrition, Animal feeding and feeds

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