Abstract
Ontogenetic changes in kin-recognition behavior, effect of social environment on kin-recognition ability, and use of visual and chemical cues in kin recognition have been studied in tadpoles of Bufo scaber after rearing them with kin, in mixed groups, or in isolation from Gosner stage 12 (gastrula). By use of a rectangular choice tank the tadpoles were tested for their ability to choose between (a) familiar siblings and unfamiliar non-siblings, (b) unfamiliar siblings and familiar non-siblings, and (c) unfamiliar siblings and unfamiliar non-siblings. When tested without any stimulus groups in the end compartments of the tank, random distribution was observed for the tadpoles and no bias for the apparatus or the procedure. In the presence of kin and non-kin in the end compartments, significantly more tadpoles spent most of their time near kin (familiar or unfamiliar) rather than near non-kin during early larval stages, up to stage 37. After stage 37 (characterized by the differentiation of toes), test tadpoles showed no preference to associate with kin, suggesting an ontogenetic shift in the kin-recognition ability in B. scaber. In experiments involving selective blockade of visual or chemical cues the test tadpoles preferentially associated near their kin on the basis of chemical rather than visual cues. These findings suggest that familiarity with siblings is not necessary for kin recognition and that kin-recognition ability is not modified after exposure to non-kin by mixed rearing. The findings for B. scaber indicate a “self referent phenotype matching” mechanism of kin recognition which is predominantly aided by chemical rather than visual cues.
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Acknowledgements
The work was supported by a grant from the Department of Science and Technology (SP/SO/C-29/2000), New Delhi awarded to SKS. DKV thanks the Council of Scientific and Industrial Research, New Delhi, for Senior Research Fellowship. SVM was supported by a University Research Studentship.
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Gramapurohit, N.P., Veeranagoudar, D.K., Mulkeegoudra, S.V. et al. Kin recognition in Bufo scaber tadpoles: ontogenetic changes and mechanism. J Ethol 24, 267–274 (2006). https://doi.org/10.1007/s10164-006-0194-6
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DOI: https://doi.org/10.1007/s10164-006-0194-6