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What Darwin could not see: island formation and historical sea levels shape genetic divergence and island biogeography in a coastal marine species
Oceanic islands play a central role in the study of evolution and island biogeography. The Galapagos Islands are one of the most studied oceanic archipelagos but research has almost exclusively focused on terrestrial organisms compared to marine species. Here we used the Galapagos bullhead shark (He...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer International Publishing
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10462691/ https://www.ncbi.nlm.nih.gov/pubmed/37400518 http://dx.doi.org/10.1038/s41437-023-00635-4 |
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author | Hirschfeld, Maximilian Barnett, Adam Sheaves, Marcus Dudgeon, Christine |
author_facet | Hirschfeld, Maximilian Barnett, Adam Sheaves, Marcus Dudgeon, Christine |
author_sort | Hirschfeld, Maximilian |
collection | PubMed |
description | Oceanic islands play a central role in the study of evolution and island biogeography. The Galapagos Islands are one of the most studied oceanic archipelagos but research has almost exclusively focused on terrestrial organisms compared to marine species. Here we used the Galapagos bullhead shark (Heterodontus quoyi) and single nucleotide polymorphisms (SNPs) to examine evolutionary processes and their consequences for genetic divergence and island biogeography in a shallow-water marine species without larval dispersal. The sequential separation of individual islands from a central island cluster gradually established different ocean depths between islands that pose barriers to dispersal in H. quoyi. Isolation by resistance analysis suggested that ocean bathymetry and historical sea level fluctuations modified genetic connectivity. These processes resulted in at least three genetic clusters that exhibit low genetic diversity and effective population sizes that scale with island size and the level of geographic isolation. Our results exemplify that island formation and climatic cycles shape genetic divergence and biogeography of coastal marine organisms with limited dispersal comparable to terrestrial taxa. Because similar scenarios exist in oceanic islands around the globe our research provides a new perspective on marine evolution and biogeography with implications for the conservation of island biodiversity. |
format | Online Article Text |
id | pubmed-10462691 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | Springer International Publishing |
record_format | MEDLINE/PubMed |
spelling | pubmed-104626912023-08-30 What Darwin could not see: island formation and historical sea levels shape genetic divergence and island biogeography in a coastal marine species Hirschfeld, Maximilian Barnett, Adam Sheaves, Marcus Dudgeon, Christine Heredity (Edinb) Article Oceanic islands play a central role in the study of evolution and island biogeography. The Galapagos Islands are one of the most studied oceanic archipelagos but research has almost exclusively focused on terrestrial organisms compared to marine species. Here we used the Galapagos bullhead shark (Heterodontus quoyi) and single nucleotide polymorphisms (SNPs) to examine evolutionary processes and their consequences for genetic divergence and island biogeography in a shallow-water marine species without larval dispersal. The sequential separation of individual islands from a central island cluster gradually established different ocean depths between islands that pose barriers to dispersal in H. quoyi. Isolation by resistance analysis suggested that ocean bathymetry and historical sea level fluctuations modified genetic connectivity. These processes resulted in at least three genetic clusters that exhibit low genetic diversity and effective population sizes that scale with island size and the level of geographic isolation. Our results exemplify that island formation and climatic cycles shape genetic divergence and biogeography of coastal marine organisms with limited dispersal comparable to terrestrial taxa. Because similar scenarios exist in oceanic islands around the globe our research provides a new perspective on marine evolution and biogeography with implications for the conservation of island biodiversity. Springer International Publishing 2023-07-03 2023-09 /pmc/articles/PMC10462691/ /pubmed/37400518 http://dx.doi.org/10.1038/s41437-023-00635-4 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Hirschfeld, Maximilian Barnett, Adam Sheaves, Marcus Dudgeon, Christine What Darwin could not see: island formation and historical sea levels shape genetic divergence and island biogeography in a coastal marine species |
title | What Darwin could not see: island formation and historical sea levels shape genetic divergence and island biogeography in a coastal marine species |
title_full | What Darwin could not see: island formation and historical sea levels shape genetic divergence and island biogeography in a coastal marine species |
title_fullStr | What Darwin could not see: island formation and historical sea levels shape genetic divergence and island biogeography in a coastal marine species |
title_full_unstemmed | What Darwin could not see: island formation and historical sea levels shape genetic divergence and island biogeography in a coastal marine species |
title_short | What Darwin could not see: island formation and historical sea levels shape genetic divergence and island biogeography in a coastal marine species |
title_sort | what darwin could not see: island formation and historical sea levels shape genetic divergence and island biogeography in a coastal marine species |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10462691/ https://www.ncbi.nlm.nih.gov/pubmed/37400518 http://dx.doi.org/10.1038/s41437-023-00635-4 |
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