Pleistocene genetic legacy suggests incipient species of Sebastes mentella in the Irminger Sea

Stefánsson, Magnús Örn; Sigurðsson, Þorsteinn; Pampoulie, Christophe; Daníelsdóttir, Anna Kristín; Thorgilsson, B; Ragnarsdóttir, A; Gíslason, Davíð; Coughlan, Jamie; Cross, Tom F.; Bernatchez, Louis

doi:10.1038/hdy.2009.10

Cited by 33 publications

(37 citation statements)

References 79 publications

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“…First, mitochondrial variation between ‘shallow’ and ‘deep’ S. mentella in the North Atlantic unveil a degree of historical divergence that previously employed genetic markers either failed to detect (Bunke, Hanel & Trautner, 2012) or could not reliably frame in a phylogeographic context (Stefánsson et al, 2009b). …”

Section: Resultsmentioning

confidence: 99%

“…Data from a selected suite of 12 microsatellite loci previously used for genotyping by Stefánsson et al (2009b) were used to calculate pairwise genetic differentiation (Weir & Cockerham’s F ST , Hedricks & Jost’s D est ) between populations with 9,999 permutations carried out to obtain significance levels using GenAIEx 6.501 software (Peakall & Smouse, 2006). Population structure was visualized by correspondence analysis (CA) using GENETIX 4.05 (Belkhir et al, 1996).…”

Section: Discussionmentioning

confidence: 99%

“…Archive samples were randomly selected from 25 shallow-pelagic (SP) (collected above 400 m depth) and 25 deep-pelagic (DP) (collected below 700 m) Sebastes mentella from the Irminger Sea, south-west of Iceland previously genotyped by Stefánsson et al (2009b) (sample numbers 4 & 5 in the original article). DNA was isolated from gill tissue that had been preserved in 96% EtOH using a modified salt extraction protocol (Miller, Dykes & Polesky, 1988) or the DNeasy kit (Qiagen©) following the manufacturer’s protocol.…”

Section: Methodsmentioning

confidence: 99%

“…North-Atlantic Sebastes have a much more recent history (Hyde & Vetter, 2007), with the four recognised extant species having diversified during the Pleistocene (Bunke, Hanel & Trautner, 2012). In particular, the beaked redfish, Sebastes mentella , consists of two genetically distinguishable groups (Stefánsson et al, 2009a; Pampoulie & Daníelsdóttir, 2008): a widely-distributed shallow-pelagic (SP) form, found between 250 and 550 m depth and a more circumscribed deep-pelagic (DP) component, between 550 and 800 m. However, doubts remain as to the forces at play and the time scales associated with this divergence (Stefánsson et al, 2009b; Cadrin et al, 2010). …”

Section: Introductionmentioning

confidence: 99%

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Divergence by depth in an oceanic fish

Shum

Pampoulie

Sacchi

et al. 2014

PeerJ

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Despite the striking physical and environmental gradients associated with depth variation in the oceans, relatively little is known about their impact on population diversification, adaptation and speciation. Changes in light associated with increasing depth are likely to alter the visual environment of organisms, and adaptive changes in visual systems may be expected. The pelagic beaked redfish, Sebastes mentella, exhibits depth-associated patterns of substructure in the central North Atlantic, with a widely distributed shallow-pelagic population inhabiting waters between 250 and 550 m depth and a deep-pelagic population dwelling between 550 and 800 m. Here we performed a molecular genetic investigation of samples from fish collected from ‘shallow’ and ‘deep’ populations, using the mitochondrial control region and the gene coding for the visual-pigment rhodopsin. We identify patterns suggestive of potential adaptation to different depths, by detecting a specific amino acid replacement at the rhodopsin gene. Mitochondrial DNA results reflect a scenario of long-term demographic independence between the two S. mentella groups, and raise the possibility that these ‘stocks’ may in fact be two incipient species.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Divergence by depth in an oceanic fish

Shum

Pampoulie

Sacchi

et al. 2014

PeerJ

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“…To date, eight cases of interspecific hybridization involving at least 16 species have been documented in the genus (Seeb, ; Roques et al ., ; Buonaccorsi et al ., , ; Hawkins et al ., ; Hyde et al ., ; Stefánsson et al ., ; Kai et al ., ; this study). Among these cases, interestingly, some form of geographic variations in the rates of hybridization have been reported in five cases (Seeb, ; Roques et al ., ; Hawkins et al ., ; Stefánsson et al ., ; this study), whereas the participating taxa occur sympatrically across their distribution, implying that geographic variation in the rate and pattern of hybridization associated with environmental factors are common in the genus. To our knowledge, the present study is the first to explicitly discuss the role of water temperature in determining the rate of interspecific hybridization in marine fishes as well as in the genus.…”

Section: Discussionmentioning

confidence: 99%

Extensive hybridization and associated geographic trends between two rockfishesSebastes vulpesandS. zonatus(Teleostei:Scorpaeniformes:Sebastidae)

Muto

Kai

Nakada

et al. 2013

J of Evolutionary Biology

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Interspecific hybridization is an important evolutionary process, which has significant influence on the diversity within and between participating taxa. Although interspecific hybridization in terrestrial and freshwater organisms has been subjected to many detailed studies, studies in marine realm have been limited in terms of both numbers and detail. In this study, the potential for interspecific hybridization between two rockfishes, Sebastes vulpes and S. zonatus, occurring in the western North Pacific, was assessed on the basis of 177 specimens collected from three sampling localities within the main geographic distribution of both species, and analysed using a combination of amplified fragment length polymorphisms (AFLP), mitochondrial DNA (mtDNA) markers and morphometric characters. Bayesian-based individual genetic assignment based on 364 AFLP loci detected a total of 63 (35.6%) hybrid specimens in the data set, the presence of interspecific hybrids also being rigorously supported by mtDNA analysis using partial sequences from the control region and morphological analysis based on 31 morphometric characters. Hybrids from all three localities were found, showing a common pattern of biased introgression across the localities whereby hybrids were more closely related to S. zonatus than to S. vulpes. Apart from this common pattern, rates of hybridization varied considerably among the localities, being greater in the northern localities. Variations in the local rates of hybridization were associated with variations in habitat segregation and thermal regime, implying that vertical water temperature regimes determined the extent of habitat segregation of the two species and, accordingly, the opportunity for hybridization.

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