Abstract
Nearest-neighbor association analysis was applied to activity centers of 2,062 individual Rattus exulans of different age-sex categories captured in 31 monthly trapping sessions. Means of relative association indices revealed that adult males and females were negatively associated with individuals of the same age-sex category, but immature males and females showed the reverse tendency. Adult males were associated with adult females and vice versa, as were immature males and females. Adult females associated with immature females but not vice versa; adult and immature males were negatively associated. Adult females and immature males showed negative associations, but adult males and immature females were associated. Seasonal differences were not marked. Association analysis has potential for detecting, representing, and classifying the spatial associations within populations and between species, and may permit elementary inferences of social structure.
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