Abstract
Species utilizing distinct resources for offspring production often show plasticity in reproductive strategies as a function of resource quality. For species using ephemeral pools, strategies are mainly shaped by a time constraint related to pool stability, resource availability and the colonizing community. We studied reproductive strategies in Amazonian poison frogs (Dendrobates ventrimaculatus) that are characterized by oviposition in distinct, small and resource-limited water bodies in leaf axils of plants and the transport of newly hatched tadpoles on the back of males to similar water bodies. Cannibalism of eggs by tadpoles was found to be the main cause of egg mortality. Typically, at the end of the rainy season new clutches of eggs were deposited in water bodies already containing a tadpole. Manipulation of the available number of water bodies showed that this observation did not result from resource limitation. We conclude that D. ventrimaculatus has a plastic reproductive strategy that includes provisioning its tadpoles with fertilized eggs as a function of desiccation risk of water bodies housing its offspring. Provisioning behavior is expected to increase developmental rate and, therefore, chances of metamorphosis for tadpoles that hatched towards the end of the rainy season. The plastic food provisioning strategy may be an important evolutionary link to bi-parental and female care with development of obligate unfertilized egg provisioning in the genus Dendrobates.
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Acknowledgements
We thank Kyle Summers, Jason Brown, Kees van Oers and two anonymous referees for valuable comments on an earlier version of this manuscript, Marga Born for advice on research and camp site equipment as well as valuable up-front information on the study area, Pierre Charles-Dominique (CNRS) for logistics and research permission to work at Nouragues field station, Patrick Chatelet for collecting weather data and the Wageningen Universiteitsfonds for financial support to EHP.
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Poelman, E.H., Dicke, M. Offering offspring as food to cannibals: oviposition strategies of Amazonian poison frogs (Dendrobates ventrimaculatus). Evol Ecol 21, 215–227 (2007). https://doi.org/10.1007/s10682-006-9000-8
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DOI: https://doi.org/10.1007/s10682-006-9000-8