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Relative role of life-history traits and historical factors in shaping genetic population structure of sardines (Sardina pilchardus)
BACKGROUND: Marine pelagic fishes exhibit rather complex patterns of genetic differentiation, which are the result of both historical processes and present day gene flow. Comparative multi-locus analyses based on both nuclear and mitochondrial genetic markers are probably the most efficient and info...
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Formato: | Texto |
Lenguaje: | English |
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BioMed Central
2007
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2204010/ https://www.ncbi.nlm.nih.gov/pubmed/17953768 http://dx.doi.org/10.1186/1471-2148-7-197 |
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author | Gonzalez, Elena G Zardoya, Rafael |
author_facet | Gonzalez, Elena G Zardoya, Rafael |
author_sort | Gonzalez, Elena G |
collection | PubMed |
description | BACKGROUND: Marine pelagic fishes exhibit rather complex patterns of genetic differentiation, which are the result of both historical processes and present day gene flow. Comparative multi-locus analyses based on both nuclear and mitochondrial genetic markers are probably the most efficient and informative approach to discerning the relative role of historical events and life-history traits in shaping genetic heterogeneity. The European sardine (Sardina pilchardus) is a small pelagic fish with a relatively high migratory capability that is expected to show low levels of genetic differentiation among populations. Previous genetic studies based on meristic and mitochondrial control region haplotype frequency data supported the existence of two sardine subspecies (S. p. pilchardus and S. p. sardina). RESULTS: We investigated genetic structure of sardine among nine locations in the Atlantic Ocean and Mediterranean Sea using allelic size variation of eight specific microsatellite loci. Bayesian clustering and assignment tests, maximum likelihood estimates of migration rates, as well as classical genetic-variance-based methods (hierarchical AMOVA test and R(ST )pairwise comparisons) supported a single evolutionary unit for sardines. These analyses only detected weak but significant genetic differentiation, which followed an isolation-by-distance pattern according to Mantel test. CONCLUSION: We suggest that the discordant genetic structuring patterns inferred based on mitochondrial and microsatellite data might indicate that the two different classes of molecular markers may be reflecting different and complementary aspects of the evolutionary history of sardine. Mitochondrial data might be reflecting past isolation of sardine populations into two distinct groupings during Pleistocene whereas microsatellite data reveal the existence of present day gene flow among populations, and a pattern of isolation by distance. |
format | Text |
id | pubmed-2204010 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2007 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-22040102008-01-17 Relative role of life-history traits and historical factors in shaping genetic population structure of sardines (Sardina pilchardus) Gonzalez, Elena G Zardoya, Rafael BMC Evol Biol Research Article BACKGROUND: Marine pelagic fishes exhibit rather complex patterns of genetic differentiation, which are the result of both historical processes and present day gene flow. Comparative multi-locus analyses based on both nuclear and mitochondrial genetic markers are probably the most efficient and informative approach to discerning the relative role of historical events and life-history traits in shaping genetic heterogeneity. The European sardine (Sardina pilchardus) is a small pelagic fish with a relatively high migratory capability that is expected to show low levels of genetic differentiation among populations. Previous genetic studies based on meristic and mitochondrial control region haplotype frequency data supported the existence of two sardine subspecies (S. p. pilchardus and S. p. sardina). RESULTS: We investigated genetic structure of sardine among nine locations in the Atlantic Ocean and Mediterranean Sea using allelic size variation of eight specific microsatellite loci. Bayesian clustering and assignment tests, maximum likelihood estimates of migration rates, as well as classical genetic-variance-based methods (hierarchical AMOVA test and R(ST )pairwise comparisons) supported a single evolutionary unit for sardines. These analyses only detected weak but significant genetic differentiation, which followed an isolation-by-distance pattern according to Mantel test. CONCLUSION: We suggest that the discordant genetic structuring patterns inferred based on mitochondrial and microsatellite data might indicate that the two different classes of molecular markers may be reflecting different and complementary aspects of the evolutionary history of sardine. Mitochondrial data might be reflecting past isolation of sardine populations into two distinct groupings during Pleistocene whereas microsatellite data reveal the existence of present day gene flow among populations, and a pattern of isolation by distance. BioMed Central 2007-10-22 /pmc/articles/PMC2204010/ /pubmed/17953768 http://dx.doi.org/10.1186/1471-2148-7-197 Text en Copyright © 2007 Gonzalez and Zardoya; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( (http://creativecommons.org/licenses/by/2.0) ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Article Gonzalez, Elena G Zardoya, Rafael Relative role of life-history traits and historical factors in shaping genetic population structure of sardines (Sardina pilchardus) |
title | Relative role of life-history traits and historical factors in shaping genetic population structure of sardines (Sardina pilchardus) |
title_full | Relative role of life-history traits and historical factors in shaping genetic population structure of sardines (Sardina pilchardus) |
title_fullStr | Relative role of life-history traits and historical factors in shaping genetic population structure of sardines (Sardina pilchardus) |
title_full_unstemmed | Relative role of life-history traits and historical factors in shaping genetic population structure of sardines (Sardina pilchardus) |
title_short | Relative role of life-history traits and historical factors in shaping genetic population structure of sardines (Sardina pilchardus) |
title_sort | relative role of life-history traits and historical factors in shaping genetic population structure of sardines (sardina pilchardus) |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2204010/ https://www.ncbi.nlm.nih.gov/pubmed/17953768 http://dx.doi.org/10.1186/1471-2148-7-197 |
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