Isolation by resistance across a complex coral reef seascape
A detailed understanding of the genetic structure of populations and an accurate interpretation of processes driving contemporary patterns of gene flow are fundamental to successful spatial conservation management. The field of seascape genetics seeks to incorporate environmental variables and proce...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
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The Royal Society Publishing
2015
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| Online Access: | http://hdl.handle.net/20.500.11937/7889 |
| _version_ | 1848745499124826112 |
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| author | Thomas, L. Kennington, W. Stat, Michael Wilkinson, S. Kool, J. Kool, J.T. Kendrick, G. Kendrick, G. |
| author_facet | Thomas, L. Kennington, W. Stat, Michael Wilkinson, S. Kool, J. Kool, J.T. Kendrick, G. Kendrick, G. |
| author_sort | Thomas, L. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | A detailed understanding of the genetic structure of populations and an accurate interpretation of processes driving contemporary patterns of gene flow are fundamental to successful spatial conservation management. The field of seascape genetics seeks to incorporate environmental variables and processes into analyses of population genetic data to improve our understanding of forces driving genetic divergence in the marine environment. Information about barriers to gene flow(such as ocean currents) is used to define a resistance surface to predict the spatial genetic structure of populations and explain deviations from the widely applied isolation-by-distance model. The majority of seascape approaches to date have been applied to linear coastal systems or at large spatial scales (more than 250 km), with very few applied to complex systems at regional spatial scales (less than 100 km). Here,we apply a seascape genetics approach to a peripheral population of the broadcast-spawning coral Acropora spicifera across the Houtman Abrolhos Islands, a high-latitude complex coral reef system off the central coast of Western Australia. We coupled population genetic data from a panel of microsatellite DNA markers with a biophysical dispersal model to test whether oceanographic processes could explain patterns of genetic divergence. We identified significant variation in allele frequencies over distances of less than 10 km, with significant differentiation occurring between adjacent sites but not between the most geographically distant ones. Recruitment probabilities between sites based on simulated larval dispersal were projected into a measure of resistance to connectivity that was significantly correlated with patterns of genetic divergence, demonstrating that patterns of spatial genetic structure are a function of restrictions to gene flow imposed by oceanographic currents. This study advances our understanding of the role of larval dispersal on the fine-scale genetic structure of coral populations across a complex island system and applies a methodological framework that can be tailored to suit a variety of marine organisms with a range of life-history characteristics. |
| first_indexed | 2025-11-14T06:18:20Z |
| format | Journal Article |
| id | curtin-20.500.11937-7889 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:18:20Z |
| publishDate | 2015 |
| publisher | The Royal Society Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-78892017-09-13T16:06:54Z Isolation by resistance across a complex coral reef seascape Thomas, L. Kennington, W. Stat, Michael Wilkinson, S. Kool, J. Kool, J.T. Kendrick, G. Kendrick, G. Acropora spicifera connectivity spatial conservation management dispersal A detailed understanding of the genetic structure of populations and an accurate interpretation of processes driving contemporary patterns of gene flow are fundamental to successful spatial conservation management. The field of seascape genetics seeks to incorporate environmental variables and processes into analyses of population genetic data to improve our understanding of forces driving genetic divergence in the marine environment. Information about barriers to gene flow(such as ocean currents) is used to define a resistance surface to predict the spatial genetic structure of populations and explain deviations from the widely applied isolation-by-distance model. The majority of seascape approaches to date have been applied to linear coastal systems or at large spatial scales (more than 250 km), with very few applied to complex systems at regional spatial scales (less than 100 km). Here,we apply a seascape genetics approach to a peripheral population of the broadcast-spawning coral Acropora spicifera across the Houtman Abrolhos Islands, a high-latitude complex coral reef system off the central coast of Western Australia. We coupled population genetic data from a panel of microsatellite DNA markers with a biophysical dispersal model to test whether oceanographic processes could explain patterns of genetic divergence. We identified significant variation in allele frequencies over distances of less than 10 km, with significant differentiation occurring between adjacent sites but not between the most geographically distant ones. Recruitment probabilities between sites based on simulated larval dispersal were projected into a measure of resistance to connectivity that was significantly correlated with patterns of genetic divergence, demonstrating that patterns of spatial genetic structure are a function of restrictions to gene flow imposed by oceanographic currents. This study advances our understanding of the role of larval dispersal on the fine-scale genetic structure of coral populations across a complex island system and applies a methodological framework that can be tailored to suit a variety of marine organisms with a range of life-history characteristics. 2015 Journal Article http://hdl.handle.net/20.500.11937/7889 10.1098/rspb.2015.1217 The Royal Society Publishing unknown |
| spellingShingle | Acropora spicifera connectivity spatial conservation management dispersal Thomas, L. Kennington, W. Stat, Michael Wilkinson, S. Kool, J. Kool, J.T. Kendrick, G. Kendrick, G. Isolation by resistance across a complex coral reef seascape |
| title | Isolation by resistance across a complex coral reef seascape |
| title_full | Isolation by resistance across a complex coral reef seascape |
| title_fullStr | Isolation by resistance across a complex coral reef seascape |
| title_full_unstemmed | Isolation by resistance across a complex coral reef seascape |
| title_short | Isolation by resistance across a complex coral reef seascape |
| title_sort | isolation by resistance across a complex coral reef seascape |
| topic | Acropora spicifera connectivity spatial conservation management dispersal |
| url | http://hdl.handle.net/20.500.11937/7889 |