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Regional and local environmental conditions do not shape the response to warming of a marine habitat-forming species

The differential response of marine populations to climate change remains poorly understood. Here,we combine common garden thermotolerance experiments in aquaria and population genetics todisentangle the factors driving the population response to thermal stress in a temperate habitatformingspecies: the octocoral Paramuricea clavata. Using eight populations separated from tens ofmeters to hundreds of kilometers, which were differentially impacted by recent mortality events,we identify 25 °C as a critical thermal threshold. After one week of exposure at this temperature,seven of the eight populations were affected by tissue necrosis and after 30 days of exposure at thistemperature, the mean % of affected colonies increased gradually from 3 to 97%. We then demonstratethe weak relation between the observed differential phenotypic responses and the local temperatureregimes experienced by each population. A significant correlation was observed between theseresponses and the extent of genetic drift impacting each population. Local adaptation may thus behindered by genetic drift, which seems to be the main driver of the differential response. Accordingly,conservation measures should promote connectivity and control density erosion in order to limit theimpact of genetic drift on marine populations facing climate change

Nature Publishing Group

Author: Crisci, C.
Ledoux, Jean-Baptiste
Mokhtar- Jamaï, K.
Bally, M.
Bensoussan, N.
Aurelle, D.
Cebrian Pujol, Emma
Coma, R.
Féral, J.-P
La Rivière, M.
Linares, Cristina
López-Sendino, P.
Marschal, Christian
Ribes, M.
Teixidó, Núria
Zuberer, F.
Garrabou, Joaquim
Abstract: The differential response of marine populations to climate change remains poorly understood. Here,we combine common garden thermotolerance experiments in aquaria and population genetics todisentangle the factors driving the population response to thermal stress in a temperate habitatformingspecies: the octocoral Paramuricea clavata. Using eight populations separated from tens ofmeters to hundreds of kilometers, which were differentially impacted by recent mortality events,we identify 25 °C as a critical thermal threshold. After one week of exposure at this temperature,seven of the eight populations were affected by tissue necrosis and after 30 days of exposure at thistemperature, the mean % of affected colonies increased gradually from 3 to 97%. We then demonstratethe weak relation between the observed differential phenotypic responses and the local temperatureregimes experienced by each population. A significant correlation was observed between theseresponses and the extent of genetic drift impacting each population. Local adaptation may thus behindered by genetic drift, which seems to be the main driver of the differential response. Accordingly,conservation measures should promote connectivity and control density erosion in order to limit theimpact of genetic drift on marine populations facing climate change
Document access: http://hdl.handle.net/2072/290982
Language: eng
Publisher: Nature Publishing Group
Rights: Attribution 3.0 Spain
Rights URI: http://creativecommons.org/licenses/by/3.0/es/
Subject: Algues marines -- Mediterrània, Mar
Marine algae -- Mediterrània, Mar
Escalfament global
Global warming
Title: Regional and local environmental conditions do not shape the response to warming of a marine habitat-forming species
Type: info:eu-repo/semantics/article
Repository: Recercat

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