Living with uncertainty: genetic imprints of climate shifts in East Pacific anchovy (Engraulis mordax) and sardine (Sardinops sagax)

Molecular Ecology
Frederic LecomteB W Bowen

Abstract

In the upwelling zone of the northeastern Pacific, cold nutrient-rich conditions alternate with warm nutrient-poor intervals on timescales ranging from months to millennia. In this setting, the abundances of Pacific sardine (Sardinops sagax) and northern anchovy (Engraulis mordax) fluctuate by several orders of magnitude, with sardine dominating during warm conditions and anchovy dominating during cool conditions. Two population models can explain the response of these fishes to adverse conditions. Under the basin model, species distributions contract to a central (optimal) range during population crashes. Expectations of this model may include a single range-wide population with a decline in genetic diversity on both sides of a central refuge. In contrast, the self-recruitment model invokes a series of local oceanographic domains that maintain semi-isolated subpopulations. During adverse conditions, some subpopulations cannot complete the life cycle within the local environment and are extirpated. Expectations of this model include some degree of population genetic structure and no clear gradient in genetic diversity. We examined mitochondrial DNA cytochrome b sequences to assess these competing models for anchovy (N = 196; 53...Continue Reading

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Citations

Sep 19, 2009·Molecular Phylogenetics and Evolution·Sophie von der HeydenConrad A Matthee
Oct 30, 2009·Molecular Ecology·Maria Sala-BozanoStefano Mariani
Sep 29, 2005·Molecular Phylogenetics and Evolution·Pilar MartínezRafael Zardoya
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May 23, 2020·Science Advances·Evan M HowardCurtis Deutsch

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