Patterns of oviposition site selection of four sympatric species of amphibians in ephemeral streams
Many oviparous animals are selective about where to lay eggs, as this greatly affects their offspring’s survival. Theoretically, species sharing the same habitat are expected to experience similar selective pressures, leading to the prediction that they might share similar oviposition preferences. H...
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| Published in: | Behavioral ecology and sociobiology Vol. 78; no. 11; p. 115 |
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| Main Authors: | , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Berlin/Heidelberg
Springer Berlin Heidelberg
01-11-2024
Springer Nature B.V |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | Many oviparous animals are selective about where to lay eggs, as this greatly affects their offspring’s survival. Theoretically, species sharing the same habitat are expected to experience similar selective pressures, leading to the prediction that they might share similar oviposition preferences. However, this hypothesis has not yet been tested. In this study, through an extensive field survey, we examined the oviposition site selection of four sympatric amphibian species (
Rana uenoi
,
Hynobius quelpaertensis
,
Bombina orientalis
, and
Dryophytes japonicus
) that reproduce in the same natural ephemeral stream. Our focus was on understanding how abiotic and biotic factors influence their reproductive choices. We primarily found that desiccation avoidance is a universal selective pressure affecting all species, with a tendency to avoid laying eggs in smaller pools prone to desiccation. Species-specific responses to leaf litter and canopy coverage were observed, but none of the species’ oviposition choices correlated with the quantity of stones in pools. We also explored biotic influences, revealing species-specific trends in the selection of pools with conspecific and heterospecific juveniles, predators, and mosquito larvae, indicating a complex ecological interplay. These findings highlight the complexity of ovipositional patterns in animals, where decisions are not driven solely by a single factor such as the avoidance of predators or competitors but also by intricate assessments of multiple factors. The study highlights that amphibian oviposition in ephemeral streams is influenced by a diverse interplay of biotic and abiotic factors, essential for understanding their reproductive strategies in dynamic environments.
Significance statement
Where and when eggs are deposited greatly impacts offspring survival in egg-laying species, particularly in fluctuating environments. Despite extensive research on egg-laying behaviours, mainly focusing on single species, there is a knowledge gap regarding the behaviour of multiple species sharing the same habitat. We hypothesized species sharing the same habitat might exhibit analogous egg-laying choices due to shared selective pressures. A thorough field study on four amphibian species in an ephemeral stream reveals a shared trend of avoiding pool drying among all species. Additionally, various biotic and abiotic factors influenced egg-laying decisions differently across species. Surprisingly, factors detrimental to juvenile survival, such as predators or competitors, were not consistently avoided in natural systems. |
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| ISSN: | 0340-5443 1432-0762 |
| DOI: | 10.1007/s00265-024-03541-9 |