Population structure of the planktonic copepod Calanus pacificus in the North Pacific Ocean

Nuwer, Mikelle; Frost, Bruce W.; Armbrust, E. Virginia

doi:10.1007/s00227-008-1068-y

Cited by 28 publications

(16 citation statements)

References 44 publications

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“…The observed genetic connectivity rather shows that its retention strategy (Peterson, 1998) does not have the potential to actually restrict gene flow between local upwelling systems. These findings agree with phylogeographic studies of other coastal zooplankton species that have only shown strong genetic differentiation across ocean basins (Nuwer et al, 2008;Harkins et al, 2013). Our analysis of the vertical population structure of C. natalis in the northern Benguela suggests that the active surface individuals and deep-living resting stages seem to belong to the same population.…”

Section: Discussionsupporting

confidence: 89%

“…Diel or ontogenetic vertical migrations and their linkage to coastal currents are believed to support the retention of planktonic organisms within upwelling systems (Verheye and Field, 1992;Johnson, 2007;Parada et al, 2008;Harkins et al, 2013;Morgan, 2014;Moyano et al, 2014). Phylogeographic studies in other zooplankton species suggest that retention strategies also promote genetic differentiation (Papetti et al, 2005;Nuwer et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Population genetic structure of Calanoides natalis (Copepoda, Calanoida) in the eastern Atlantic Ocean and Benguela upwelling system

Höring¹,

Cornils²,

Auel³

et al. 2017

Journal of Plankton Research

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The population genetic structure of Calanoides natalis (ex Calanoides carinatus; Copepoda, Calanoida), an ecologically important component of African upwelling systems, was studied in order to (i) search for potential cryptic species, (ii) describe spatial patterns in the distribution of genetic variance and (iii) identify potential barriers to gene flow. Samples were obtained in the eastern Atlantic Ocean from the Iberian Peninsula to Namibia. Analysis of mitochondrial (cytochrome c oxidase subunit I; COI) and nuclear (citrate synthase; CS) marker genes revealed a genetically cohesive population of C. natalis with a prevalent shift in allele frequencies. The discovery of a deep split solely present in the mitochondrial dataset does not point to cryptic speciation, but rather suggests the occurrence of nuclear mitochondrial pseudogenes or incomplete reproductive isolation upon secondary contact. Genetic differentiation between the northern and southern hemisphere was significant, which may point to a potential, but permeable barrier close to the equator. No vertical genetic structuring was detected in the northern Benguela implying that horizontal differentiation was more pronounced than vertical structuring. Retention mechanisms and the oxygen minimum zone did not have a strong impact on genetic differentiation of C. natalis in the Benguela region.

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Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Population genetic structure of Calanoides natalis (Copepoda, Calanoida) in the eastern Atlantic Ocean and Benguela upwelling system

Höring¹,

Cornils²,

Auel³

et al. 2017

Journal of Plankton Research

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“…This hypothesis remains to be tested, particularly in the light of the possibility that seasonal upwelling of cold waters along the western margins of the American and African continents may act as a corridor for transequatorial dispersal, as has been suggested for anti-tropical and bipolar planktonic foraminifers (54,56). Overall, transoceanic dispersal of clade I seems less plausible than previously thought because coastal and open sea environments have very different physical and biological characteristics (53,57). In addition, several key features of the life history of Pseudo-nitzschia appear to preclude easy dispersal over the open ocean.…”

Section: Resultsmentioning

confidence: 98%

Limits to gene flow in a cosmopolitan marine planktonic diatom

Casteleyn

Leliaert

Backeljau

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

207

175

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The role of geographic isolation in marine microbial speciation is hotly debated because of the high dispersal potential and large population sizes of planktonic microorganisms and the apparent lack of strong dispersal barriers in the open sea. Here, we show that gene flow between distant populations of the globally distributed, bloom-forming diatom species Pseudo-nitzschia pungens (clade I) is limited and follows a strong isolation by distance pattern. Furthermore, phylogenetic analysis implies that under appropriate geographic and environmental circumstances, like the pronounced climatic changes in the Pleistocene, population structuring may lead to speciation and hence may play an important role in diversification of marine planktonic microorganisms. A better understanding of the factors that control population structuring is thus essential to reveal the role of allopatric speciation in marine microorganisms.allopatric speciation | dispersal | marine cosmopolitan planktonic microorganisms | population structure | microsatellites

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“…Furthermore, differences in host susceptibility (Glover et al 2003, Glover & Skaala 2006) may also influence groups of lice. Studies conducted on other marine copepods have revealed significant genetic variation among populations despite a high potential for dispersal (Bucklin et al 2000, Oines & Heuch 2007, Nuwer et al 2008, and population-specific adaptations to salinity have been documented (Beyrend-Dur et al 2009). Additionally, some copepod studies have revealed cryptic species as opposed to populations (Lee 2000, Chen & Hare 2008, as evidenced by reproductive incompatibility (Lee 2000).…”

Section: Discussionmentioning

confidence: 99%

Population genetic structure of the parasitic copepod Lepeophtheirus salmonis throughout the Atlantic

Glover

Stølen²,

Messmer³

et al. 2011

Mar. Ecol. Prog. Ser.

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The parasitic copepod Lepeophtheirus salmonis is responsible for huge economic losses in the salmonid aquaculture industry, and has been linked with declines of wild salmonid populations. In order to elucidate population genetic structure throughout the Atlantic Ocean, 2495 lice representing 27 samples collected from 22 locations were analysed for 14 microsatellite loci. Significant overall genetic variation was observed (14 loci: global F ST = 0.0057, p < 0.0001), although this decreased slightly when an outlier locus (LsalSTA3), detected as a candidate for positive selection, was removed (13 neutral loci: global F ST = 0.0022, p < 0.0001). A relationship between physical and genetic distance was observed (R 2 = 0.179, p = 0.0013), but only when data from LsalSTA3 was included. No overall genetic variation was observed among the 19 samples collected in Norway (Norwegian global F ST < 0.0001, p = 0.6). None of the within-country (Canada, Ireland, Shetland and Faroe Islands) pairwise F ST values were statistically significant when analysing the 13 neutral loci and following Bonferroni correction. Samples taken at 5 Norwegian farms did not exhibit significant genetic differences before and after medicated treatment. We conclude that L. salmonis displays weak but nevertheless statistically significant population genetic variation throughout the Atlantic. Analysis of temporal samples, potentially combined with larger numbers of markers giving greater genome coverage, will be required to fully elucidate the biological significance of the observed variation.

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Population structure of the planktonic copepod Calanus pacificus in the North Pacific Ocean

Cited by 28 publications

References 44 publications

Population genetic structure of Calanoides natalis (Copepoda, Calanoida) in the eastern Atlantic Ocean and Benguela upwelling system

Population genetic structure of Calanoides natalis (Copepoda, Calanoida) in the eastern Atlantic Ocean and Benguela upwelling system

Limits to gene flow in a cosmopolitan marine planktonic diatom

Population genetic structure of the parasitic copepod Lepeophtheirus salmonis throughout the Atlantic

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