Population genetic structure of the glacier lanternfish,<i>Benthosema glaciale</i>(Myctophidae) in Norwegian waters

Suneetha, Kristogu Baduge; Salvanes, Anne Gro Vea

doi:10.1080/00364827.2001.10420476

Cited by 21 publications

(15 citation statements)

References 41 publications

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“…Our results indicate that fjords act as semienclosed basins effectively isolating coral populations living within them. The evidence we present conforms to previous results from population genetic studies in pelagic and benthic organisms such as calanoid copepods (Bucklin et al 2000), glacier lanternfish (Suneetha & Salvanes 2001) …”

Section: Discussionsupporting

confidence: 90%

Evolutionary and ecological genomics in deep-sea organisms

Monroy¹

2015

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Hydrothermal vents and coral ecosystems are conspicuous biological hot spots in the deep-sea. These ecosystems face increasing threats from human activities. Having thorough taxonomic inventories as well as understanding species' relatedness, genetic diversity, connectivity patterns, and adaptive potential is fundamental for the implementation of conservation strategies that help mitigate these threats. This thesis provides fundamental high-priority knowledge in taxonomic, evolutionary, and ecological aspects of deep-sea coral and vent species, by harnessing the power of genomic tools and overcoming long-standing methodological barriers. First, I develop bioinformatic tools that help guide the design of studies aiming to characterize eukaryotic genome diversity using restriction-site associated DNA sequencing. Using these tools I find that the predictability of restriction site frequencies in eukaryotic genomes is chiefly determined by the phylogenetic position of the target species and the recognition sequence of the selected restriction enzyme. These tools are then applied to test global-scale historical biogeographic hypotheses of vent fauna using barnacles as model. Phylogeographic inferences suggest that the western Pacific was the place of origin of the major vent barnacle lineage, followed by circumglobal colonization eastward along the southern hemisphere during the Neogene. I suggest that the geological processes and dispersal mechanisms discussed here can explain distribution patterns of many other marine taxa in addition to barnacles. Regional-scale analyses indicate that vent barnacle populations are well connected within basins and ridge systems, and that their diversity patterns do not conform to the predictions from the hypothesis that seamounts are centers of endemism. I then move on to resolve long-standing questions regarding species definitions in recalcitrant deep-sea coral taxa, by unambiguously resolving evolutionary relationships and objectively inferring species boundaries. Finally, I explore the adaptive potential of deep-sea coral species to environmental changes by examining a case of adaptation to shallow water from the deep sea. Candidate positive-selection markers shared between pairs of shallow and deep populations are identified as likely makers for genomic regions involved in adaptation. Overall, the results from this thesis constitute critical baseline data with which to assess potential effects of anthropogenic disturbances on deep-sea ecosystems. AKNOWLEDGEMENTSThis degree is the fulfillment of a lifelong dream. I am infinitely grateful to Tim Shank, for taking a chance with me, for challenging me constantly, for honest advising, for providing limitless opportunities to pursue my interests and develop my skills, for unconditional support and trust, and for making me feel more like a colleague than a student since the first day. I could not imagine a better place to have done my PhD. I look forward to many more ventures to come. I am extremely grateful to my committee ...

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Section: Discussionsupporting

confidence: 90%

Evolutionary and ecological genomics in deep-sea organisms

Monroy¹

2015

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“…1998; Drengstig et al . 2000; Suneetha & Nævdal 2001; Suneetha & Salvanes 2001). Local geological and hydrological characteristics (Farmer & Freeland 1983) can explain the limited gene flow between the fjord populations and those in offshore waters, and the genetic differentiation that has developed in the 10 000 years since the creation of the fjords.…”

Section: Discussionmentioning

confidence: 99%

Genetic structure of the deep‐sea coral Lophelia pertusa in the northeast Atlantic revealed by microsatellites and internal transcribed spacer sequences

2004

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The azooxanthellate scleractinian coral Lophelia pertusa has a near-cosmopolitan distribution, with a main depth distribution between 200 and 1000 m. In the northeast Atlantic it is the main framework-building species, forming deep-sea reefs in the bathyal zone on the continental margin, offshore banks and in Scandinavian fjords. Recent studies have shown that deep-sea reefs are associated with a highly diverse fauna. Such deep-sea communities are subject to increasing impact from deep-water fisheries, against a background of poor knowledge concerning these ecosystems, including the biology and population structure of L. pertusa. To resolve the population structure and to assess the dispersal potential of this deep-sea coral, specific microsatellites markers and ribosomal internal transcribed spacer (ITS) sequences ITS1 and ITS2 were used to investigate 10 different sampling sites, distributed along the European margin and in Scandinavian fjords. Both microsatellite and gene sequence data showed that L. pertusa should not be considered as one panmictic population in the northeast Atlantic but instead forms distinct, offshore and fjord populations. Results also suggest that, if some gene flow is occurring along the continental slope, the recruitment of sexually produced larvae is likely to be strongly local. The microsatellites showed significant levels of inbreeding and revealed that the level of genetic diversity and the contribution of asexual reproduction to the maintenance of the subpopulations were highly variable from site to site. These results are of major importance in the generation of a sustainable management strategy for these diversity-rich deep-sea ecosystems.

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“…Although myctophids in general, and both forms of Triphoturus in particular (Hulley, 1986), are capable of ample diel vertical migrations, they are not active swimmers capable of performing long distance horizontal migration. There is evidence that demonstrates that the genetic population structure of other myctophids is affected by barriers that prevent dispersion in a scale as small as 200 km (Suneetha & Salvanes, 2001).…”

Section: Summary Of the Differences For Partial Sequences In Cytochromentioning

confidence: 99%

Divergence of two forms of Triphoturus in the eastern Pacific based on mtDNA cytochrome b gene sequences and larval morphology

Rodríguez-Graña

Herrera

et al. 2004

Journal of Fish Biology

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Divergence between two eastern Pacific forms of Triphoturus, currently considered to belong to the same species was tested by DNA sequences of the cytochrome b gene (DNA obtained from larvae collected in northern Chile and from adults in the Southern California Bight) and examination of larval characters. The number of apparently fixed substitutions (12 among 31 variable sites, out of 1001 bases) was high and the pattern of mid-lateral trunk pigmentation in larvae also differed consistently between the two forms. The results support the separate species status for T. mexicanus

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Population genetic structure of the glacier lanternfish,Benthosema glaciale(Myctophidae) in Norwegian waters

Cited by 21 publications

References 41 publications

Evolutionary and ecological genomics in deep-sea organisms

Evolutionary and ecological genomics in deep-sea organisms

Genetic structure of the deep‐sea coral Lophelia pertusa in the northeast Atlantic revealed by microsatellites and internal transcribed spacer sequences

Divergence of two forms of Triphoturus in the eastern Pacific based on mtDNA cytochrome b gene sequences and larval morphology

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