Abstract
In many species, males and females mate with multiple partners, which gives rise to sperm competition and multiple paternity. The experiments on water frogs presented here demonstrate that such sperm competition can affect the structure and dynamics of mixed-species communities. The hybrid frog Rana esculenta (LR) mates with one of its parental species, usually R. lessonae (LL), although in some areas R. ridibunda (RR), to regain the premeiotically eliminated parental genome ("hybridogenesis"). Mixed LL/LR-populations are stable although hybrid numbers should continuously increase at the expense of parental animals, because of differences in female fecundity and other factors. This would finally lead to the extinction of the sexual host, followed by that of the sexual parasite, unless the reproductive superiority of R. esculenta is reduced by other factors, such as lower hybrid male fertility. Eggs from LL- and LR-females were fertilised in vitro by single- and multi-male sperm suspensions of LL-, LR- and RR-males. In all experiments, the proportion of offspring sired by R. esculenta sperm was significantly lower than that sired by R. lessonae or R. ridibunda sperm. Gonad mass, sperm morphology, sperm swimming velocity, and sperm survival did not explain these differences in fertilisation success; nor did gamete recognition and compatibility. Sperm density was the only trait that paralleled fertilisation success, but it offers no explanation either, because densities were equalised for the in-vitro fertilisations. In natural LL/LR populations, the significantly smaller amount, poorer competitive ability and lower long-term survival of R. esculenta compared to R. lessonae sperm will reduce the initial reproductive superiority of hybrids and contribute to the stabilisation of mixed water-frog populations. Differences in fertilisation ability are also likely to be relevant for the structure and dynamics of several other systems with encounters between eggs and sperm from different genotypes, ecotypes, ploidy levels and/or species.


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Acknowledgements
We are grateful to G. Schwarzenbach, M.-O. Wälti, A. Schwarzenbach, N. Ramer and B. Gruber for their help in catching frogs. C. Vorburger taught us how to perform in-vitro fertilisation and D. Hosken showed us everything we needed to know about sperm handling. S. Röthlisberger and T. Garner kindly introduced us to enzyme electrophoresis, PCR and other laboratory techniques; T. Garner also conducted the paternity analysis. M. Nakano patiently assisted in computerising sperm images and tracking sperm speed and C. Som kept the computers running. Last, but not least, we thank L. Martin, P. Pearman, and J. Van Buskirk for making useful suggestions on an earlier version of the paper. This study was conducted with approval and under the ethical guidelines of the "Veterinäramt Kanton Zürich" (licence number 88/99) and was financially supported through Swiss National Science Foundation grant 31-40688.94 to H.-U. Reyer, and a scholarship, the "Eidgenössische Stipendienkommission für Ausländische Studierende" to A. Hettyey.
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Reyer, HU., Niederer, B. & Hettyey, A. Variation in fertilisation abilities between hemiclonal hybrid and sexual parental males of sympatric water frogs (Rana lessonae, R. esculenta, R. ridibunda). Behav Ecol Sociobiol 54, 274–284 (2003). https://doi.org/10.1007/s00265-003-0635-y
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DOI: https://doi.org/10.1007/s00265-003-0635-y


