Genetic divergence between two phenotypically distinct bottlenose dolphin ecotypes suggests separate evolutionary trajectories
Due to their worldwide distribution and occupancy of different types of environments, bottlenose dolphins display considerable morphological variation. Despite limited understanding about the taxonomic identity of such forms and connectivity among them at global scale, coastal (or inshore) and offsh...
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Online Access: | http://hdl.handle.net/2263/64212 https://doi.org/10.1002/ece3.3335 |
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ftunivpretoria:oai:repository.up.ac.za:2263/64212 2023-05-15T17:36:05+02:00 Genetic divergence between two phenotypically distinct bottlenose dolphin ecotypes suggests separate evolutionary trajectories Fruet, Pedro F. Secchi, Eduardo R. Di Tullio, Juliana C. Simoes-Lopes, Paulo Cesar Daura-Jorge, Fabio Costa, Ana P.B. Vermeulen, Els Flores, Paulo A.C. Genoves, Rodrigo Cezar Laporta, Paula Beheregaray, Luciano B. Moller, Luciana M. 2017-11 http://hdl.handle.net/2263/64212 https://doi.org/10.1002/ece3.3335 en eng Wiley http://hdl.handle.net/2263/64212 2045-7758 (online) doi:10.1002/ece3.3335 © 2017 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License. CC-BY Biopsy sampling Conservation Evolutionarily significant unit Microsatellites South America Diversity Working group North Atlantic Mitochondrial DNA (mtDNA) Southwest Atlantic Ocean (SWA) Multilocus genotype data DNA control region Killer whales (Orcinus orca) Bottlenose dolphin (Tursiops truncatus) Article 2017 ftunivpretoria https://doi.org/10.1002/ece3.3335 2022-05-31T13:35:15Z Due to their worldwide distribution and occupancy of different types of environments, bottlenose dolphins display considerable morphological variation. Despite limited understanding about the taxonomic identity of such forms and connectivity among them at global scale, coastal (or inshore) and offshore (or oceanic) ecotypes have been widely recognized in several ocean regions. In the Southwest Atlantic Ocean (SWA), however, there are scarce records of bottlenose dolphins differing in external morphology according to habitat preferences that resemble the coastal-offshore pattern observed elsewhere. The main aim of this study was to analyze the genetic variability, and test for population structure between coastal (n = 127) and offshore (n = 45) bottlenose dolphins sampled in the SWA to assess whether their external morphological distinction is consistent with genetic differentiation. We used a combination of mtDNA control region sequences and microsatellite genotypes to infer population structure and levels of genetic diversity. Our results from both molecular marker types were congruent and revealed strong levels of structuring (microsatellites FST = 0.385, p < .001; mtDNA FST = 0.183, p < .001; ΦST = 0.385, p < .001) and much lower genetic diversity in the coastal than the offshore ecotype, supporting patterns found in previous studies elsewhere. Despite the opportunity for gene flow in potential “contact zones”, we found minimal current and historical connectivity between ecotypes, suggesting they are following discrete evolutionary trajectories. Based on our molecular findings, which seem to be consistent with morphological differentiations recently described for bottlenose dolphins in our study area, we recommend recognizing the offshore bottlenose dolphin ecotype as an additional Evolutionarily Significant Unit (ESU) in the SWA. Implications of these results for the conservation of bottlenose dolphins in SWA are also discussed. Organization for the Conservation of South American Aquatic ... Article in Journal/Newspaper North Atlantic Orca Orcinus orca University of Pretoria: UPSpace Ecology and Evolution 7 21 9131 9143 |
institution |
Open Polar |
collection |
University of Pretoria: UPSpace |
op_collection_id |
ftunivpretoria |
language |
English |
topic |
Biopsy sampling Conservation Evolutionarily significant unit Microsatellites South America Diversity Working group North Atlantic Mitochondrial DNA (mtDNA) Southwest Atlantic Ocean (SWA) Multilocus genotype data DNA control region Killer whales (Orcinus orca) Bottlenose dolphin (Tursiops truncatus) |
spellingShingle |
Biopsy sampling Conservation Evolutionarily significant unit Microsatellites South America Diversity Working group North Atlantic Mitochondrial DNA (mtDNA) Southwest Atlantic Ocean (SWA) Multilocus genotype data DNA control region Killer whales (Orcinus orca) Bottlenose dolphin (Tursiops truncatus) Fruet, Pedro F. Secchi, Eduardo R. Di Tullio, Juliana C. Simoes-Lopes, Paulo Cesar Daura-Jorge, Fabio Costa, Ana P.B. Vermeulen, Els Flores, Paulo A.C. Genoves, Rodrigo Cezar Laporta, Paula Beheregaray, Luciano B. Moller, Luciana M. Genetic divergence between two phenotypically distinct bottlenose dolphin ecotypes suggests separate evolutionary trajectories |
topic_facet |
Biopsy sampling Conservation Evolutionarily significant unit Microsatellites South America Diversity Working group North Atlantic Mitochondrial DNA (mtDNA) Southwest Atlantic Ocean (SWA) Multilocus genotype data DNA control region Killer whales (Orcinus orca) Bottlenose dolphin (Tursiops truncatus) |
description |
Due to their worldwide distribution and occupancy of different types of environments, bottlenose dolphins display considerable morphological variation. Despite limited understanding about the taxonomic identity of such forms and connectivity among them at global scale, coastal (or inshore) and offshore (or oceanic) ecotypes have been widely recognized in several ocean regions. In the Southwest Atlantic Ocean (SWA), however, there are scarce records of bottlenose dolphins differing in external morphology according to habitat preferences that resemble the coastal-offshore pattern observed elsewhere. The main aim of this study was to analyze the genetic variability, and test for population structure between coastal (n = 127) and offshore (n = 45) bottlenose dolphins sampled in the SWA to assess whether their external morphological distinction is consistent with genetic differentiation. We used a combination of mtDNA control region sequences and microsatellite genotypes to infer population structure and levels of genetic diversity. Our results from both molecular marker types were congruent and revealed strong levels of structuring (microsatellites FST = 0.385, p < .001; mtDNA FST = 0.183, p < .001; ΦST = 0.385, p < .001) and much lower genetic diversity in the coastal than the offshore ecotype, supporting patterns found in previous studies elsewhere. Despite the opportunity for gene flow in potential “contact zones”, we found minimal current and historical connectivity between ecotypes, suggesting they are following discrete evolutionary trajectories. Based on our molecular findings, which seem to be consistent with morphological differentiations recently described for bottlenose dolphins in our study area, we recommend recognizing the offshore bottlenose dolphin ecotype as an additional Evolutionarily Significant Unit (ESU) in the SWA. Implications of these results for the conservation of bottlenose dolphins in SWA are also discussed. Organization for the Conservation of South American Aquatic ... |
format |
Article in Journal/Newspaper |
author |
Fruet, Pedro F. Secchi, Eduardo R. Di Tullio, Juliana C. Simoes-Lopes, Paulo Cesar Daura-Jorge, Fabio Costa, Ana P.B. Vermeulen, Els Flores, Paulo A.C. Genoves, Rodrigo Cezar Laporta, Paula Beheregaray, Luciano B. Moller, Luciana M. |
author_facet |
Fruet, Pedro F. Secchi, Eduardo R. Di Tullio, Juliana C. Simoes-Lopes, Paulo Cesar Daura-Jorge, Fabio Costa, Ana P.B. Vermeulen, Els Flores, Paulo A.C. Genoves, Rodrigo Cezar Laporta, Paula Beheregaray, Luciano B. Moller, Luciana M. |
author_sort |
Fruet, Pedro F. |
title |
Genetic divergence between two phenotypically distinct bottlenose dolphin ecotypes suggests separate evolutionary trajectories |
title_short |
Genetic divergence between two phenotypically distinct bottlenose dolphin ecotypes suggests separate evolutionary trajectories |
title_full |
Genetic divergence between two phenotypically distinct bottlenose dolphin ecotypes suggests separate evolutionary trajectories |
title_fullStr |
Genetic divergence between two phenotypically distinct bottlenose dolphin ecotypes suggests separate evolutionary trajectories |
title_full_unstemmed |
Genetic divergence between two phenotypically distinct bottlenose dolphin ecotypes suggests separate evolutionary trajectories |
title_sort |
genetic divergence between two phenotypically distinct bottlenose dolphin ecotypes suggests separate evolutionary trajectories |
publisher |
Wiley |
publishDate |
2017 |
url |
http://hdl.handle.net/2263/64212 https://doi.org/10.1002/ece3.3335 |
genre |
North Atlantic Orca Orcinus orca |
genre_facet |
North Atlantic Orca Orcinus orca |
op_relation |
http://hdl.handle.net/2263/64212 2045-7758 (online) doi:10.1002/ece3.3335 |
op_rights |
© 2017 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1002/ece3.3335 |
container_title |
Ecology and Evolution |
container_volume |
7 |
container_issue |
21 |
container_start_page |
9131 |
op_container_end_page |
9143 |
_version_ |
1766135443128057856 |