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Reproductive success and failure: the role of winter body mass in reproductive allocation in Norwegian moose

Oecologia volume 172, pages 995–1005 (2013)Cite this article

Abstract

A life history strategy that favours somatic growth over reproduction is well known for long-lived iteroparous species, especially in unpredictable environments. Risk-sensitive female reproductive allocation can be achieved by a reduced reproductive effort at conception, or the subsequent adjustment of investment during gestation or lactation in response to unexpected environmental conditions or resource availability. We investigated the relative importance of reduced investment at conception compared with later in the reproductive cycle (i.e. prenatal, perinatal or neonatal mortality) in explaining reproductive failure in two high-density moose (Alces alces) populations in southern Norway. We followed 65 multiparous, global positioning system (GPS)-collared females throughout the reproductive cycle and focused on the role of maternal nutrition during gestation in determining reproductive success using a quasi-experimental approach to manipulate winter forage availability. Pregnancy rates in early winter were normal (≥0.8) in all years while spring calving rates ranged from 0.4 to 0.83, with prenatal mortality accounting for most of the difference. Further losses over summer reduced autumn recruitment rates to 0.23–0.69, despite negligible predation. Over-winter mass loss explained variation in both spring calving and autumn recruitment success better than absolute body mass in early or late winter. Although pregnancy was related to body mass in early winter, overall reproductive success was unrelated to pre-winter body condition. We therefore concluded that reproductive success was limited by winter nutritional conditions. However, we could not determine whether the observed reproductive allocation adjustment was a bet-hedging strategy to maximise reproduction without compromising survival or whether females were simply unable to invest more resources in their offspring.

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Acknowledgments

We thank Fritzöe Skoger and Løvenskiold-Fossum in Telemark and Stor-Elvdal Landowners’ Association in Hedmark for collaborating as partners in this project. Thanks to all who helped with the collection of field data and in particular to Bent Thorkildsen, Staffan Klasson, Knut B. Nicolaysen and Tor Taraldsrud for their assistance during capturing and hunting. We thank Bram van Moorter, Jon M. Arnemo and Scott Becker for useful discussions, and Marco Festa-Bianchet and an anonymous reviewer for useful comments on an earlier version of the manuscript. Funding was provided by the Norwegian Research Council (173868/AREAL), Innovation Norway, Telemark County, Hedmark County and municipalities in Telemark, Vestfold and Hedmark. All work carried out during this study conforms to the legal requirements set by Forsøksdyrutvalget (Animal Research Committee) in Norway.

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  1. Floris M. van Beest

    Present address: Department of Animal and Poultry Science, College of Agriculture and Bioresources, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, S7N 5E2, Canada

Affiliations

  1. Faculty of Applied Ecology and Agricultural Sciences, Hedmark University College, Evenstad, 2480, Koppang, Norway

    Jos M. Milner, Floris M. van Beest & Torstein Storaas

  2. Norwegian Institute for Nature Research, 7485, Trondheim, Norway

    Erling J. Solberg

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  1. Jos M. Milner
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  2. Floris M. van Beest
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Correspondence to Jos M. Milner.

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Communicated by Ilpo Kojola.

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Milner, J.M., van Beest, F.M., Solberg, E.J. et al. Reproductive success and failure: the role of winter body mass in reproductive allocation in Norwegian moose. Oecologia 172, 995–1005 (2013). https://doi.org/10.1007/s00442-012-2547-x

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Keywords

  • Deer
  • Life history
  • Reproductive effort
  • Supplementary feeding
  • Trade-off