Abstract
Tadpoles of Sphaerotheca breviceps raised in the laboratory from the egg stage, and hence lacking prior experience of a predator or its odors, were tested to examine their responses to a predator’s (tadpoles of Hoplobatrachus tigerinus) water-borne chemical cues. The stimulus solution was obtained following 24 h of rearing tadpoles of H. tigerinus (one tadpole per 200 mL water) that were not fed during this period. Upon exposure to the stimulus solution the activity of S. breviceps tadpoles decreased by about 90% within 5 min. Their resting period increased significantly over baseline activity, whereas the swimming period, distance traversed, and swimming spurts declined. However, whenever a test tadpole moved, its swimming velocity was high in response to stimulus solution. The antipredatory responses declined with increase in time of storage of the stimulus solution, indicating decay of the predator’s chemical cues. The findings suggest that (1) antipredator defense strategies of S. breviceps do not require prior experience of predators, (2) the predator’s chemical cues are labile in nature, and (3) the response of prey tadpoles to such cues is similar to reported behavior of anuran tadpoles in response to real predators and alarm cues.
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Acknowledgments
The study was supported by a grant from DST (SP/SO/C-29/2000) and UGC-SAP II-DRS grant from UGC, New Delhi awarded to SKS and BAS. SSS thanks the Indian Academy of Sciences, Bangalore for a Summer Fellowship.
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Sharma, S.S., Veeranagoudar, D.K., Shanbhag, B.A. et al. Activity of Sphaerotheca breviceps tadpoles in response to chemical cues of the predaceous tadpoles Hoplobatrachus tigerinus . J Ethol 26, 303–307 (2008). https://doi.org/10.1007/s10164-007-0061-0
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DOI: https://doi.org/10.1007/s10164-007-0061-0