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Within-population variation in ejaculate characteristics in a prolonged breeder, Peron's tree frog, Litoria peronii

Sherman, Craig D.H., Uller, Tobias, Wapstra, Erik and Olsson, Mats 2008, Within-population variation in ejaculate characteristics in a prolonged breeder, Peron's tree frog, Litoria peronii, Naturwissenschaften, vol. 95, no. 11, pp. 1055-1061, doi: 10.1007/s00114-008-0423-7.

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Title Within-population variation in ejaculate characteristics in a prolonged breeder, Peron's tree frog, Litoria peronii
Formatted title Within-population variation in ejaculate characteristics in a prolonged breeder, Peron's tree frog, Litoria peronii
Author(s) Sherman, Craig D.H.ORCID iD for Sherman, Craig D.H. orcid.org/0000-0003-2099-0462
Uller, Tobias
Wapstra, Erik
Olsson, Mats
Journal name Naturwissenschaften
Volume number 95
Issue number 11
Start page 1055
End page 1061
Total pages 7
Publisher Springer
Place of publication Berlin, Germany
Publication date 2008-11
ISSN 0028-1042
1432-1904
Summary Sperm number is often a good predictor of success in sperm competition; however, it has become increasingly clear that, for some species, variation in probability of paternity cannot be explained by sperm number alone. Intraspecific variation in ejaculate characteristics, such as the number of viable sperm and sperm longevity, may play an equally important role in determining fertilization success. Here, we assess variation among ejaculates in three factors that may contribute to fertilization success (number of sperm per ejaculate, viability, and longevity), in a population of Peron’s tree frog (Litoria peronii). We detected large variation among males in the number of sperm per ejaculate and the proportion of viable sperm within ejaculates, which could not be explained by variation in either male size or body condition. However, the proportion of viable sperm released by males increased over the season. Finally, we assessed sperm longevity (proportion viable sperm determined using a dual-fluorochrome vital dye) at two different temperatures. At 23°C, on average, 75% of sperm remained viable after 2 h, but there were significant differences amongst males with the percentage of viable sperm ranging from 43% to 95%. For sperm incubated at 4°C, ejaculates varied fivefold in sperm longevity with some males having 50% viable sperm after 5 days. Our data suggest that ejaculate characteristics (sperm number, viability, and longevity) vary widely in Peron’s tree frog and may therefore play an important role in determining siring success both in the presence and absence of sperm competition. We discuss the results in relation to selection on ejaculate traits via natural and sexual selection in this and other amphibians.
Language eng
DOI 10.1007/s00114-008-0423-7
Field of Research 060803 Animal Developmental and Reproductive Biology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2008, Springer
Persistent URL http://hdl.handle.net/10536/DRO/DU:30024141

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