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Seasonality determines patterns of growth and age structure over a geographic gradient in an ectothermic vertebrate

  • Population ecology - Original research
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Abstract

Environmental variation connected with seasonality is likely to affect the evolution of life-history strategies in ectotherms, but there is no consensus as to how important life-history traits like body size are influenced by environmental variation along seasonal gradients. We compared adult body size, skeletal growth, mean age, age at first reproduction and longevity among 11 common frog (Rana temporaria) populations sampled along a 1,600-km-long latitudinal gradient across Scandinavia. Mean age, age at first reproduction and longevity increased linearly with decreasing growth season length. Lifetime activity (i.e. the estimated number of active days during life-time) was highest at mid-latitudes and females had on average more active days throughout their lives than males. Variation in body size was due to differences in lifetime activity among populations—individuals (especially females) were largest where they had the longest cumulative activity period—as well as to differences between populations in skeletal growth rate as determined by skeletochronological analyses. Especially, males grew faster at intermediate latitudes. While life-history trait variation was strongly associated with latitude, the direction and shape of these relationships were sex- and trait-specific. These context-dependent relationships may be the result of life-history trade-offs enforced by differences in future reproductive opportunities and time constraints among the populations. Thus, seasonality appears to be an important environmental factor shaping life-history trait variation in common frogs.

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Acknowledgments

We thank A.T. Laugen, K. Räsänen, M. Pahkala, S. Andersson, J. Elmberg, A. Järvinen, S. Karttunen, B. Lardner, J. Loman, G. Løe, G. Sahlén and R. Tramontano for help in field and laboratory and B. Rogell and J. Loehr for helpful comments on the manuscript. We also want to thank W. Blackenhorn and two anonymous reviewers for fruitful comments. The reported experiments comply with the current laws of Sweden and Finland concerning animal experimentation, and permission to collect frogs was received from the Ethical Committee for Animal Experiments in Uppsala County (C21/98). The Swedish Research Council (I.J., A.L., J.M,) and the Academy of Finland (A.L., J.M.) funded this research.

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The authors declare they have no conflict of interest.

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Authors and Affiliations

  1. Population and Conservation Biology/Department of Ecology and Genetics, Uppsala University, Norbyv. 18D, 752 36, Uppsala, Sweden

    Mårten B. Hjernquist, Fredrik Söderman & Anssi Laurila

  2. School of Education and Environment, Kristianstad University, 291 88, Kristianstad, Sweden

    K. Ingemar Jönsson

  3. Department of Biosciences, Ecological Genetics Research Unit, University of Helsinki, PO Box 65, 00014, Helsinki, Finland

    Gábor Herczeg & Juha Merilä

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  1. Mårten B. Hjernquist
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  2. Fredrik Söderman
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  4. Gábor Herczeg
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  5. Anssi Laurila
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  6. Juha Merilä
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Correspondence to K. Ingemar Jönsson.

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Communicated by Lin Schwarzkopf.

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Hjernquist, M.B., Söderman, F., Jönsson, K.I. et al. Seasonality determines patterns of growth and age structure over a geographic gradient in an ectothermic vertebrate. Oecologia 170, 641–649 (2012). https://doi.org/10.1007/s00442-012-2338-4

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