Harbor porpoise losing its edges: genetic time series suggests a rapid population decline in Iberian waters over the last 30 years
International audience Impact of climate change is expected to be especially noticeable at the edges of a species’ distribution, where they meet sub-optimal habitat conditions. In Mauritania and Iberia, two genetically differentiated populations of harbor porpoises (Phocoena phocoena) form an ecotyp...
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ftunimontpellier:oai:HAL:hal-04303383v1 2024-02-11T10:07:58+01:00 Harbor porpoise losing its edges: genetic time series suggests a rapid population decline in Iberian waters over the last 30 years Ben Chehida, Yacine Stelwagen, Tjibbe Hoekendijk, Jeroen Ferreira, Marisa Eira, Catarina Pereira, Andreia Nicolau, Lidia Thumloup, Julie Fontaine, Michael C. Groningen Institute for Evolutionary Life Sciences Groningen (GELIFES) University of Groningen Groningen Maladies infectieuses et vecteurs : écologie, génétique, évolution et contrôle (MIVEGEC) Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud )-Université de Montpellier (UM) 2023 https://hal.science/hal-04303383 https://hal.science/hal-04303383/document https://hal.science/hal-04303383/file/Ben_Chehida_MS_IBeria_V4_withoutTrackChange.pdf en eng HAL CCSD Wiley Open Access hal-04303383 https://hal.science/hal-04303383 https://hal.science/hal-04303383/document https://hal.science/hal-04303383/file/Ben_Chehida_MS_IBeria_V4_withoutTrackChange.pdf http://creativecommons.org/licenses/by-nc-nd/ info:eu-repo/semantics/OpenAccess EISSN: 2045-7758 Ecology and Evolution https://hal.science/hal-04303383 Ecology and Evolution, In press cetacean conservation genetics genetic time series genetic diversity bycatch approximate Bayesian computation population genetic modelling [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE] info:eu-repo/semantics/article Journal articles 2023 ftunimontpellier 2024-01-23T23:34:59Z International audience Impact of climate change is expected to be especially noticeable at the edges of a species’ distribution, where they meet sub-optimal habitat conditions. In Mauritania and Iberia, two genetically differentiated populations of harbor porpoises (Phocoena phocoena) form an ecotype adapted to local upwelling conditions and distinct from other ecotypes further north on the NE Atlantic continental shelf and in the Black Sea. By analyzing the evolution of mitochondrial genetic variation in the Iberian population between two temporal cohorts (1990-2002 vs. 2012-2015), we report a substantial decrease in genetic diversity. Phylogenetic analyses including neighboring populations identified two porpoises in southern Iberia carrying a divergent haplotype closely related to those from the Mauritanian population, yet forming a distinct lineage. This suggests that Iberian porpoises may not be as isolated as previously thought, indicating possible dispersion from Mauritania or an unknown population in between, but none from the northern ecotype. Demo-genetic scenario testing by approximate Bayesian computation showed that the rapid decline in the Iberian mitochondrial diversity was not simply due to the genetic drift of a small population, but models support instead a substantial decline in effective population size, possibly resulting from environmental stochasticity, prey depletion, or acute fishery bycatches. These results illustrate the value of genetics time series to inform demographic trends and emphasize the urgent need for conservation measures to ensure the viability of this small harbor porpoise population in Iberian waters. Article in Journal/Newspaper Phocoena phocoena Université de Montpellier: HAL |
institution |
Open Polar |
collection |
Université de Montpellier: HAL |
op_collection_id |
ftunimontpellier |
language |
English |
topic |
cetacean conservation genetics genetic time series genetic diversity bycatch approximate Bayesian computation population genetic modelling [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE] |
spellingShingle |
cetacean conservation genetics genetic time series genetic diversity bycatch approximate Bayesian computation population genetic modelling [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE] Ben Chehida, Yacine Stelwagen, Tjibbe Hoekendijk, Jeroen Ferreira, Marisa Eira, Catarina Pereira, Andreia Nicolau, Lidia Thumloup, Julie Fontaine, Michael C. Harbor porpoise losing its edges: genetic time series suggests a rapid population decline in Iberian waters over the last 30 years |
topic_facet |
cetacean conservation genetics genetic time series genetic diversity bycatch approximate Bayesian computation population genetic modelling [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE] |
description |
International audience Impact of climate change is expected to be especially noticeable at the edges of a species’ distribution, where they meet sub-optimal habitat conditions. In Mauritania and Iberia, two genetically differentiated populations of harbor porpoises (Phocoena phocoena) form an ecotype adapted to local upwelling conditions and distinct from other ecotypes further north on the NE Atlantic continental shelf and in the Black Sea. By analyzing the evolution of mitochondrial genetic variation in the Iberian population between two temporal cohorts (1990-2002 vs. 2012-2015), we report a substantial decrease in genetic diversity. Phylogenetic analyses including neighboring populations identified two porpoises in southern Iberia carrying a divergent haplotype closely related to those from the Mauritanian population, yet forming a distinct lineage. This suggests that Iberian porpoises may not be as isolated as previously thought, indicating possible dispersion from Mauritania or an unknown population in between, but none from the northern ecotype. Demo-genetic scenario testing by approximate Bayesian computation showed that the rapid decline in the Iberian mitochondrial diversity was not simply due to the genetic drift of a small population, but models support instead a substantial decline in effective population size, possibly resulting from environmental stochasticity, prey depletion, or acute fishery bycatches. These results illustrate the value of genetics time series to inform demographic trends and emphasize the urgent need for conservation measures to ensure the viability of this small harbor porpoise population in Iberian waters. |
author2 |
Groningen Institute for Evolutionary Life Sciences Groningen (GELIFES) University of Groningen Groningen Maladies infectieuses et vecteurs : écologie, génétique, évolution et contrôle (MIVEGEC) Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud )-Université de Montpellier (UM) |
format |
Article in Journal/Newspaper |
author |
Ben Chehida, Yacine Stelwagen, Tjibbe Hoekendijk, Jeroen Ferreira, Marisa Eira, Catarina Pereira, Andreia Nicolau, Lidia Thumloup, Julie Fontaine, Michael C. |
author_facet |
Ben Chehida, Yacine Stelwagen, Tjibbe Hoekendijk, Jeroen Ferreira, Marisa Eira, Catarina Pereira, Andreia Nicolau, Lidia Thumloup, Julie Fontaine, Michael C. |
author_sort |
Ben Chehida, Yacine |
title |
Harbor porpoise losing its edges: genetic time series suggests a rapid population decline in Iberian waters over the last 30 years |
title_short |
Harbor porpoise losing its edges: genetic time series suggests a rapid population decline in Iberian waters over the last 30 years |
title_full |
Harbor porpoise losing its edges: genetic time series suggests a rapid population decline in Iberian waters over the last 30 years |
title_fullStr |
Harbor porpoise losing its edges: genetic time series suggests a rapid population decline in Iberian waters over the last 30 years |
title_full_unstemmed |
Harbor porpoise losing its edges: genetic time series suggests a rapid population decline in Iberian waters over the last 30 years |
title_sort |
harbor porpoise losing its edges: genetic time series suggests a rapid population decline in iberian waters over the last 30 years |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04303383 https://hal.science/hal-04303383/document https://hal.science/hal-04303383/file/Ben_Chehida_MS_IBeria_V4_withoutTrackChange.pdf |
genre |
Phocoena phocoena |
genre_facet |
Phocoena phocoena |
op_source |
EISSN: 2045-7758 Ecology and Evolution https://hal.science/hal-04303383 Ecology and Evolution, In press |
op_relation |
hal-04303383 https://hal.science/hal-04303383 https://hal.science/hal-04303383/document https://hal.science/hal-04303383/file/Ben_Chehida_MS_IBeria_V4_withoutTrackChange.pdf |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/ info:eu-repo/semantics/OpenAccess |
_version_ |
1790606854032719872 |