Des différences, pourquoi? Transmission, maintenance and effects of phenotypic variance

The Journal of Animal Ecology
Floriane PlardShripad Tuljapurkar

Abstract

Despite the observed distribution of variable individual phenotypes, survival and reproductive performance in wild populations, models of population dynamics often focus on mean demographic rates. Populations are constituted by individuals with different phenotypes and thus different performances. However, many models of population dynamics provide no understanding of the influence of this phenotypic variation on population dynamics. In this paper, we investigate how the relationships between demographic rates and phenotype distribution influence the transmission and the upholding of phenotypic variation, and population dynamics. We used integral projection models to measure associations between differences of phenotypic trait (size or mass) among individuals and demographic rates, growth and inheritance, and then quantify the influence of phenotypic variation on population dynamics. We build an analytical and general model resulting from simplifications assuming small phenotypic variance. We illustrate our model with two case studies: a short- and a long-lived life history. Population growth rate r is determined by a Lotka style equation in which survival and fertility are averaged over a phenotypic distribution that changes w...Continue Reading

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Citations

Feb 24, 2016·The Journal of Animal Ecology·Dylan Z ChildsMark Rees
Jan 13, 2018·Proceedings. Biological Sciences·Miguel BarbosaAnne E Magurran
Dec 5, 2017·Oecologia·Stine S MarkussenBernt-Erik Sæther
Jul 22, 2021·Ecology Letters·Amy B ForsytheWilliam A Nelson

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