Morphometric and Electrophoretic Approaches to Discrimination of Capelin (Mallotus villosus) Populations in the Estuary and Gulf of St. Lawrence

Roby, Daniel D.; Lambert, J. David; Sévigny, J. M.

doi:10.1139/f91-243

Cited by 31 publications

(19 citation statements)

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“…Such insight is a prerequisite for the formulation of criteria for units of conservation in order to reduce the risk of extinction, particularly at the intra-specific levels. The existence of significant populationlevel differences have previously been noted in estuarine fishes using both morphological and genetic criteria (Roby et al, 1991 andUiblein, 1995), providing evidence for the hypothesis of divergence due to partial isolation.…”

Section: Introductionmentioning

confidence: 76%

Morphological heterogeneity in some estuarine populations of the catfish Arius jella (Ariidae) in Sri Lanka

Gunawickrama

2009

Ceylon J. Sci. (Biol. Sci.)

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Intra-specific morphological variation in the indigenous catfish Arius jella (Ariidae) was studied in five estuarine localities in Sri Lanka (Koggala lagoon, Walawe estuary, Garanduwa lagoon, Nilwala estuary and Chilaw lagoon) using morphometric analysis. Five morphometric characteristics describing the shape of the fish were significantly different among some of the locations. Significantly shorter pre-orbital length (8.3% SL vs 9.2-10.7% SL in the other populations) in specimens from Walawe estuary is a populationspecific character. Significant differences in other characteristics were found indicating heterogeneity in morphology. The first two canonical variates (CV) explained 82.7% of the total variation in the data, yet the plot of the CV failed to display significant separation of the sample populations. Derived classification functions could correctly classify an average of less than 50% individuals into their a priori groups. There was no agreement on the isolation by distance model. The results indicate a small degree of spatial separation in morphology in A. jella among the studied estuarine localities.

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Section: Introductionmentioning

confidence: 76%

Morphological heterogeneity in some estuarine populations of the catfish Arius jella (Ariidae) in Sri Lanka

Gunawickrama

2009

Ceylon J. Sci. (Biol. Sci.)

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“…genetic differentiation of Barents Sea capelin from a local fjord population (Balsfjord) (Mork & Friis-Sörensen 1983) and between ocean and beach spawning capelin from Newfoundland (Dodson et al 1991). However, Roby et al (1991) showed that capelin in the St. Lawrence estuary and Gulf of St. Lawrence (eastern Canada) could be differentiated into eastern and western populations using a combination of morphometric and genetic methods.…”

Section: Introductionmentioning

confidence: 98%

“…Whereas previous studies on population genetics of capelin have used polymorphic proteins (allozymes) (Payne 1976, Mork & Friis-Sörensen 1983, Sørensen & Simonsen 1988, Roby et al 1991) and mtDNA as genetic markers (Dodson et al 1991, Birt et al 1995, a set of di-and tetranucleotide microsatellite DNA markers has recently been developed for capelin population discrimination (Røed et al 2003, Gordos et al 2005. The advantage of microsatellite markers compared to other genetic markers is that they are putatively neutral and highly polymorphic, their codominant alleles are easy to score, and they provide more informative results than other markers (cf.…”

Section: Introductionmentioning

confidence: 99%

Circumpolar genetic population structure of capelin Mallotus villosus

Præbel

Westgaard²,

Fevolden³

et al. 2008

Mar. Ecol. Prog. Ser.

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Capelin Mallotus villosus is the most abundant pelagic fish species in boreal and subarctic waters. The ecological and commercial importance of capelin emphasizes the need for a better understanding of the genetic population structure of the species and the mechanisms underlying its population dynamics. With this aim, 1155 capelin from the entire distributional range of the species were genotyped using 9 recently-developed microsatellite markers. The genetic analyses clearly demonstrated that the circumpolar capelin population can be divided into 4 regional groups: (1) West Pacific, (2) East Pacific, (3) Newfoundland, and (4) Northeast Atlantic and West Greenland. Highly significant genetic differentiation was observed between capelin from the western and eastern Pacific, and a high assignment success within both regions indicated minimal gene flow between these populations. Within the Atlantic Ocean, the Newfoundland population was differentiated from all the other samples. Among the remaining samples within the Atlantic Ocean the microsatellite data were less conclusive. Comparison of our results with studies of species with similar distribution, duration of planktonic stages and dispersal capacity suggests that genetic structuring of capelin within the complex system of the Northeast Atlantic Ocean cannot be ruled out. KEY WORDS: Mallotus villosus · Population structure · Genetic differentiation · Microsatellite markersResale or republication not permitted without written consent of the publisher

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“…Whereas largescale differentiation has been reported, e.g. separating western and eastern Atlantic stocks (Dodson et al 1991, Birt et al 1995, investigations on smaller geographic scales have led to less conclusive results (Mork & Friis-Sørensen 1983, Sørensen & Simonsen 1988, Dodson et al 1991, Roby et al 1991. The use of microsatellites as genomic DNA markers to analyze the processes of genetic drift and gene flow has increased rapidly over the last years for various species including fish (cf.…”

Section: Introductionmentioning

confidence: 99%

Isolation and characterization of DNA microsatellites for capelin Mallotus villosus population genetic studies

Røed

Fevolden²,

Christiansen³

et al. 2003

Mar. Ecol. Prog. Ser.

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This study reports on the isolation and characterization of capelin Mallotus villosus DNA microsatellites and their potential use in population genetic studies. High numbers of dinucleotide repeats were detected among the isolated microsatellites. Primers and polymerase chain reaction conditions were developed for 17 polymorphic microsatellite markers, and in a test panel of 60 capelin the number of alleles at each locus ranged from 4 to 63, and observed heterozygosity ranged from 0.11 to 0.95. Six loci showed an excess of homozygotes, presumably due to the presence of null alleles. The 11 other loci showed statistically significant population differentiation between samples from the NE and NW Atlantic, while little differentiation was detected within each of these regions. KEY WORDS: Capelin · Mallotus villosus · Microsatellite · Population structureResale or republication not permitted without written consent of the publisher

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Morphometric and Electrophoretic Approaches to Discrimination of Capelin (Mallotus villosus) Populations in the Estuary and Gulf of St. Lawrence

Cited by 31 publications

References 1 publication

Morphological heterogeneity in some estuarine populations of the catfish <i>Arius jella</i> (Ariidae) in Sri Lanka

Morphological heterogeneity in some estuarine populations of the catfish <i>Arius jella</i> (Ariidae) in Sri Lanka

Circumpolar genetic population structure of capelin Mallotus villosus

Isolation and characterization of DNA microsatellites for capelin Mallotus villosus population genetic studies

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