Divergent timing of egg-laying may maintain life history polymorphism in potentially multivoltine insects in seasonal environments

Journal of Evolutionary Biology
Panu VälimäkiJari Oksanen

Abstract

The length of the favourable season determines voltinism in insect populations. In some insects, there is variation in fecundity and timing of reproduction among females. If the length of the favourable season does not allow all offspring to develop into adults without diapause, the benefits of high early fecundity may outweigh the associated cost of low lifetime fecundity. We tested this by exploring mating frequencies of Pieris napi females along a latitudinal gradient in different generations. Pieris napi is a bivoltine butterfly, and genetically polyandrous females enjoy higher lifetime fecundity than monandrous ones. Polyandry is, however, coupled with a relatively low early fecundity. We found that monandrous females are more likely to produce an additional generation than polyandrous ones under conditions that allow production of only a partial summer generation. Monandrous females were also the first to emerge and slightly over-represented in the summer generation under conditions that allow the development of a complete summer generation. Further, a stochastic model shows that variation in the timing of reproduction between strategies is sufficient to explain the observed patterns. Thus, seasonality may counter-select ...Continue Reading

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Citations

Dec 25, 2009·Proceedings. Biological Sciences·Florian Altermatt
Oct 25, 2013·Evolution; International Journal of Organic Evolution·Sami M KiveläKarl Gotthard
Dec 1, 2012·Journal of Evolutionary Biology·P VälimäkiT Tammaru
Aug 11, 2012·Ecological Entomology·Angus R Westgarth-SmithJohn P Sumpter
May 25, 2011·The Journal of Animal Ecology·Sami M KiveläJari Oksanen
Oct 1, 2014·The Journal of Animal Ecology·Inger M Aalberg Haugen, Karl Gotthard
Jul 24, 2015·Evolution; International Journal of Organic Evolution·Sami M KiveläKarl Gotthard
Aug 23, 2016·Ecology and Evolution·Sami M KiveläKarl Gotthard
Apr 11, 2019·Journal of Evolutionary Biology·Andreas SutterNina Wedell
Apr 10, 2020·Oecologia·Netta M KeretPanu M Välimäki

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