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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
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, Volume 98, Year 2017
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Description
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. © 2016 Elsevier Ltd
Authors & Co-Authors
Carbonell, José Antonio
Spain, Murcia
Universidad de Murcia
Bilton, David T.
United Kingdom, Plymouth
University of Plymouth
Calosi, Piero
Canada, Rimouski
Université du Québec à Rimouski
Millán, Andrés
Spain, Murcia
Universidad de Murcia
Stewart, Alan J.A.
United Kingdom, Brighton
University of Sussex
Velasco, Josefa
Spain, Murcia
Universidad de Murcia
Statistics
Citations: 14
Authors: 6
Affiliations: 4
Identifiers
Doi:
10.1016/j.jinsphys.2016.11.015
ISSN:
00221910
Research Areas
Environmental
Noncommunicable Diseases
Sexual And Reproductive Health
Study Design
Cross Sectional Study