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Differential temperature effects on photoperiodism in female voles: An explanation for species-specific declines in vole populations
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  • Laura van Rosmalen,
  • Bernd Riedstra,
  • Nico Beemster,
  • Cor Dijkstra,
  • Roelof Hut
Laura van Rosmalen
University of Groningen
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Bernd Riedstra
Groningen Institute for Evolutionary Life Sciences
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Nico Beemster
Altenburg & Wymenga Ecological Consultants
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Cor Dijkstra
Rijksuniversiteit Groningen
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Roelof Hut
Rijksuniversiteit Groningen
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Abstract

Many mammalian species use photoperiod as a predictive cue to time seasonal reproduction. In addition, metabolic effects on the reproductive axis may also influence seasonal timing, especially in female small, short-lived mammals. To get a better understanding of how annual cycling environmental cues impact reproductive function and plasticity in small, short-lived herbivores with different geographic origins, we investigated the mechanisms underlying integration of temperature in the photoperiodic-axis regulating female reproduction in a Northern vole species (tundra vole, Microtus oeconomus) and in a Southern vole species (common vole, Microtus arvalis). We show that photoperiod and temperature interact to determine appropriate physiological responses; there is species-dependent annual variation in the sensitivity to temperature for reproductive organ development. In common voles, temperature can overrule photoperiodical spring-programmed responses, with reproductive organ mass being higher at 10°C than at 21°C, whereas in autumn they are less sensitive to temperature. These findings are in line with our census data, showing an earlier onset of spring reproduction in cold springs, while reproductive offset in autumn is synchronized to photoperiod. The reproductive organs of tundra voles were relatively insensitive to temperature, whereas hypothalamic gene expression was generally upregulated at 10°C. Thus, both vole species use photoperiod, whereas only common voles use temperature as a cue to control spring reproduction, which indicates species-specific reproductive strategies. Due to global warming, spring reproduction in common voles will be delayed, perhaps resulting in shorter breeding seasons and thus declining populations, as observed throughout Europe.
03 Nov 2021Submitted to Molecular Ecology
07 Nov 2021Submission Checks Completed
07 Nov 2021Assigned to Editor
29 Nov 2021Reviewer(s) Assigned
23 Dec 2021Review(s) Completed, Editorial Evaluation Pending
06 Jan 2022Editorial Decision: Revise Minor
20 Mar 2022Review(s) Completed, Editorial Evaluation Pending
20 Mar 20221st Revision Received
28 Mar 2022Editorial Decision: Accept