Genetic and morphological stock structure of the pearlside,<i>Maurolicus muelleri</i>(Pisces, Sternoptychidae), among Norwegian fjords and offshore area

Suneetha, Kristogu Baduge; Nævdal, Gunnar

doi:10.1080/00364827.2001.10420475

Cited by 18 publications

(16 citation statements)

References 41 publications

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“…The absence of diverse haplotypes in the fjord habitat may point to a small founder population. The absence of other North Sea-haplotypes in the fjord may indicate a restricted gene flow between the two localities, and similar inferences on the gene flow have been made earlier in an allozyme study of M. muelleri (Suneetha & Naevdal, 2000). The overall haplotype diversity (Nei, 1987) in M. muelleri (n=18) was 0·31 (...=0·03), and the overall T I. Intraspecific sequence variation in 524 nucleotide-long segment of the 16S rRNA gene of two Maurolicus taxa.…”

supporting

confidence: 72%

Analysis of mitochondrial DNA sequences from two Maurolicus taxa: evidence for separate species?

Suneetha

Dahle

Nævdal

2000

Journal of Fish Biology

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Fixed nucleotide differences were found in the partial 16S rRNA mitochondrial gene sequences between two regional populations of Maurolicus (identified as M. muelleri and M. walvisensis), indicating clear genealogical separation of the two taxa. Accordingly, the two taxa can be considered as recently diverged species, supporting the recent proposition of a polytypic genus Maurolicus. 2000 The Fisheries Society of the British Isles

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supporting

confidence: 72%

Analysis of mitochondrial DNA sequences from two Maurolicus taxa: evidence for separate species?

Suneetha

Dahle

Nævdal

2000

Journal of Fish Biology

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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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“…Different letters after mean cohort values at a given age represent significantly different mean values (GLM, p < 0.05). M tially constituted a source population of a more widely distributed metapopulation (Suneetha and Naevdal 2001;James et al 2002).…”

Section: Physical Explanations For Differential Cohort Mortalitymentioning

confidence: 99%

Impact of hatch date on early life growth and survival of Mueller’s pearlside (Maurolicus muelleri) larvae and life-history consequences

Folkvord

Gundersen

Albretsen

et al. 2016

Can. J. Fish. Aquat. Sci.

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Growth and survival of Maurolicus muelleri larvae in Herdlefjorden, Norway, were investigated by daily otolith increment analysis. While high egg densities were generally observed throughout the spawning season, three cohorts each with a narrow window of hatching dates were identified. The first of these cohorts was characterized by low growth and poor morphometric condition and disappeared from the fjord during autumn. High-resolution drift modeling indicated that Herdlefjorden had a net export of larvae and negligible import in the period cohort 1 disappeared. Yet, the advective loss rate of larvae was not considered high enough to explain the near complete disappearance of the first cohort. An otolith-based growth chronology indicated that growth conditions in Herdlefjorden improved noticeably around mid-September and remained favorable the following month. The analysis of daily otolith increments could thus be used to document within-season variability in larval growth and survival. The low and variable survival due to short-term fluctuations in environmental conditions indicate that multiple batch spawning is an adequately evolved life-history strategy for marine planktivorous fish such as M. muelleri.Résumé : La croissance et la survie des larves de Maurolicus muelleri dans le Herdlefjorden (Norvège) ont été étudiées par l'analyse des incréments quotidiens d'otolithes. Si de fortes densités d'oeufs ont été généralement observées durant toute la saison de frai, trois cohortes ont néanmoins été identifiées, chacune présentant sa propre fourchette restreinte de dates d'éclosion. La première cohorte était caractérisée par une faible croissance et un faible embonpoint morphométrique et a disparue du fjord durant l'automne. La modélisation à haute résolution de la dérive indique que le Herdlefjorden présentait une exportation nette de larves et une importation négligeable dans la période durant laquelle la première cohorte a disparu. Le taux de perte de larves par advection n'est toutefois pas jugé assez élevé pour expliquer la disparition presque complète de la première cohorte. Une chronologie de la croissance reposant sur les otolithes indique que les conditions de croissance dans le Herdlefjorden se sont améliorées de manière marquée vers la mi-septembre et sont demeurées favorables le mois suivant. L'analyse des incréments quotidiens d'otolithes pourrait donc être utilisée pour documenter la variabilité au cours d'une même saison de la croissance et de la survie des larves. Une survie faible et variable causée par des fluctuations de courte durée des conditions ambiantes indique que frayer en plusieurs épisodes constitue une bonne stratégie d'évolution du cycle biologique pour les poissons marins planctonivores comme M. muelleri. [Traduit par la Rédaction]

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Genetic and morphological stock structure of the pearlside,Maurolicus muelleri(Pisces, Sternoptychidae), among Norwegian fjords and offshore area

Cited by 18 publications

References 41 publications

Analysis of mitochondrial DNA sequences from two Maurolicus taxa: evidence for separate species?

Analysis of mitochondrial DNA sequences from two Maurolicus taxa: evidence for separate species?

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

Impact of hatch date on early life growth and survival of Mueller’s pearlside (Maurolicus muelleri) larvae and life-history consequences

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