Size- and scale-dependent chemical attraction contribute to an ontogenetic shift in sociality

Article Abstract:

Y-maze shelter choice experiments were performed on Caribbean spiny lobsters, Panulirus argus, to determine whether body size of spatial scale influences their receptivity to or production of a chemical attractant among conspecifics. Results show that lobster greater than 15 mm in carapace length are attracted to conspecific odors and that large lobsters generate enough scent to attract conspecifics from a few meters away. The findings suggest that body size- and spatial scale-dependent attraction influence the shift of P. argus from solitary to social shelter use.

Social behavior in animals, Animal social behavior, Spiny lobsters

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A test of centre-edge hypotheses in a permanently territorial songbird, the Australian magpie, Gymnorhina tibicen

Article Abstract:

An experiment testing the centre-edge hypotheses in a permanently territorial songbird represented by the Australian magpie, Gymnorhina tibicen, was conducted. Results indicate no support for the central-place foraging hypothesis, or for the strategic center hypothesis. The central-resource hypothesis may account for the pattern of the results; in effect, the proximity of a resource that makes the territory valuable may not be central.

Spatial behavior in animals, Animal spatial behavior, Territoriality (Zoology), Animal territoriality, Magpies

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