Metabolic and reproductive plasticity of core and marginal populations of the eurythermic saline water bug Sigara selecta (Hemiptera: Corixidae) in a climate change context

Carbonell, J A, Bilton, D T, Calosi, P, Millan, A, Stewart, A and Velasco, J (2017) Metabolic and reproductive plasticity of core and marginal populations of the eurythermic saline water bug Sigara selecta (Hemiptera: Corixidae) in a climate change context. Journal of Insect Physiology, 98. pp. 59-66. ISSN 0022-1910

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Abstract

Ongoing climate change is driving dramatic range shifts in diverse taxa worldwide, and species responses to global change are likely to be determined largely by population responses at geographical range margins. Here we investigate the metabolic and reproductive plasticity in response to water temperature and salinity variation of two populations of the eurythermic saline water bug Sigara selecta: one population located close to the northern edge of its distribution, in a relatively cold, thermally stable region (SE England – ‘marginal’), and one close to the range centre, in a warmer and more thermally variable Mediterranean climate (SE Spain – ‘core’). We compared metabolic and oviposition rates and egg size, following exposure to one of four different combinations of temperature (15 and 25 °C) and salinity (10 and 35 g L¯¹). Oviposition rate was significantly higher in the marginal population, although eggs laid were smaller overall. No significant differences in oxygen consumption rates were found between core and marginal populations, although the marginal population showed higher levels of plasticity in both metabolic and reproductive traits. Our results suggest that population-specific responses to environmental change are complex and may be mediated by differences in phenotypic plasticity. In S. selecta, the higher plasticity of the marginal population may facilitate both its persistence in current habitats and northward expansion with future climatic warming. The less plastic core population may be able to buffer current environmental variability with minor changes in metabolism and fecundity, but could be prone to extinction if temperature and salinity changes exceed physiological tolerance limits in the future.

Item Type: Article
Keywords: Ecophysiology; Range margins; Metabolic rate; Fecundity; Trade-offs; Global change
Schools and Departments: School of Life Sciences > Biology and Environmental Science
Subjects: Q Science > QL Zoology > QL0360 Invertebrates > QL0434 Arthropoda > QL0463 Insects
Depositing User: Alan Stewart
Date Deposited: 05 Jan 2017 15:23
Last Modified: 24 Aug 2017 05:03
URI: http://sro.sussex.ac.uk/id/eprint/66045

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