Seasonal time constraints reduce genetic variation in life-history traits along a latitudinal gradient

The Journal of Animal Ecology
Szymon SniegulaFrank Johansson

Abstract

Time constraints cause strong selection on life-history traits, because populations need to complete their life cycles within a shorter time. We therefore expect lower genetic variation in these traits in high- than in low-latitude populations, since the former are more time-constrained. The aim was to estimate life-history traits and their genetic variation in an obligately univoltine damselfly along a latitudinal gradient of 2730 km. Populations were grown in the laboratory at temperatures and photoperiods simulating those at their place of origin. In a complementary experiment, individuals from the same families were grown in constant temperature and photoperiod that mimicked average conditions across the latitude. Development time and size was faster and smaller, respectively, and growth rate was higher at northern latitudes. Additive genetic variance was very low for life-history traits, and estimates for egg development time and larval growth rate showed significant decreases towards northern latitudes. The expression of genetic effects in life-history traits differed considerably when individuals were grown in constant rather than simulated and naturally variable conditions. Our results support strong selection by time c...Continue Reading

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Citations

Jan 19, 2017·Molecular Ecology·Marie LeysKatja Räsänen
Oct 16, 2018·Tree Physiology·José A Ramírez-ValienteJeannine Cavender-Bares
Jan 20, 2019·The Journal of Animal Ecology·Szymon SniegulaFrank Johansson
Jul 8, 2017·Evolution; International Journal of Organic Evolution·John T Waller, Erik I Svensson
Aug 23, 2019·Evolution; International Journal of Organic Evolution·Sandra HangartnerKeyne Monro
Jun 20, 2020·Ecology and Evolution·Konrad Karlsson, Monika Winder
Dec 7, 2016·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Lesley T LancasterRobert N Fitt
Dec 29, 2020·Evolution; International Journal of Organic Evolution·Frank JohanssonDavid Berger
Jun 25, 2021·Evolution; International Journal of Organic Evolution·Lillie K PenningtonJason P Sexton

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