Why does a grasshopper have fewer, larger offspring at its range limits?

Hassall, M, Walters, RJ, Telfer, M and Hassall, MRJ (2006) Why does a grasshopper have fewer, larger offspring at its range limits? Journal of Evolutionary Biology, 19 (1). pp. 267-276. ISSN 1010-061X

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Abstract

Analysis of size of offspring reared through three laboratory generations from populations of the field grasshopper Chorthippus brunneus from 27 sites around the British Isles showed that offspring were larger towards the cooler-wetter conditions in the western and northern limits of the range. This variation had a significant genetic component. There was a trade-off between clutch size and offspring size between and within populations. Under favourable thermal and feeding conditions maternal fitness was optimal when individuals produced the largest clutches of the smallest eggs, but under poor conditions maternal fitness was optimal when individuals produced small clutches of very large offspring. Calculation of geometric mean fitness over time indicated that having larger offspring near to the edge of the range could be advantageous as a conservative risk-spreading strategy. As well as geographic variation in egg size, significant environment-genotype interactions in egg size in relation to temperature were observed.

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
University of East Anglia > Faculty of Science > Research Centres > Centre for Ecology, Evolution and Conservation
University of East Anglia > Faculty of Science > Research Groups > Environmental Biology
University of East Anglia > Faculty of Science > Research Groups > Resources, Sustainability and Governance
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Depositing User: Rosie Cullington
Date Deposited: 20 May 2011 14:31
Last Modified: 25 Jul 2018 06:10
URI: https://ueaeprints.uea.ac.uk/id/eprint/31175
DOI: 10.1111/j.1420-9101.2005.00967.x

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