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Oceanographic barri...
Oceanographic barriers to gene flow promote genetic subdivision of the tunicate Ciona intestinalis in a North Sea archipelago
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- Johannesson, Kerstin, 1955 (author)
- Gothenburg University,Göteborgs universitet,Linnécentrum för marin evolutionsbiologi (CEMEB),Institutionen för marina vetenskaper,Linnaeus Centre for Marine Evolutionary Biology (CEMEB),Department of marine sciences
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- Ring, Anna-Karin, 1979 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Linnécentrum för marin evolutionsbiologi (CEMEB),Department of marine sciences,Linnaeus Centre for Marine Evolutionary Biology (CEMEB)
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- Johannesson, Klara B. (author)
- Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences
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- Renborg, Elin (author)
- Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences
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- Jonsson, Per R., 1957 (author)
- Gothenburg University,Göteborgs universitet,Linnécentrum för marin evolutionsbiologi (CEMEB),Institutionen för marina vetenskaper,Linnaeus Centre for Marine Evolutionary Biology (CEMEB),Department of marine sciences
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- Havenhand, Jonathan N., 1959 (author)
- Gothenburg University,Göteborgs universitet,Linnécentrum för marin evolutionsbiologi (CEMEB),Institutionen för marina vetenskaper,Linnaeus Centre for Marine Evolutionary Biology (CEMEB),Department of marine sciences
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(creator_code:org_t)
- 2018-07-11
- 2018
- English.
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In: Marine Biology. - : Springer Science and Business Media LLC. - 0025-3162 .- 1432-1793. ; 165:8
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https://gup.ub.gu.se...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Pelagic larval development has the potential to connect populations over large geographic distances and prevent genetic structuring. The solitary tunicate Ciona intestinalis has pelagic eggs and a swimming larval stage lasting for maximum a few days, with the potential for a homogenizing gene flow over relatively large areas. In the eastern North Sea, it is found in a geomorphologically complex archipelago with a mix of fjords and open costal habitats. Here, the coastal waters are also stratified with a marked pycnocline driven by salinity and temperature differences between shallow and deep waters. We investigated the genetic structure of C. intestinalis in this area and compared it with oceanographic barriers to dispersal that would potentially reduce connectivity among local populations. Genetic data from 240 individuals, sampled in 2 shallow, and 4 deep-water sites, showed varying degrees of differentiation among samples (F (ST) = 0.0-0.11). We found no evidence for genetic isolation by distance, but two distant deep-water sites from the open coast were genetically very similar indicating a potential for long-distance gene flow. However, samples from different depths from the same areas were clearly differentiated, and fjord samples were different from open-coast sites. A biophysical model estimating multi-generation, stepping-stone larval connectivity, and empirical data on fjord water mass retention time showed the presence of oceanographic barriers that explained the genetic structure observed. We conclude that the local pattern of oceanographic connectivity will impact on the genetic structure of C. intestinalis in this region.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
Keyword
- marine protected areas
- population-structure
- vertical-distribution
- invertebrate larvae
- local adaptation
- ascidian larvae
- spatial scales
- pelagic larvae
- dispersal
- connectivity
- Marine & Freshwater Biology
Publication and Content Type
- ref (subject category)
- art (subject category)
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