Macrogeographic genetic variability in the Gastropod Mollusk Littorina sitkana from the Northwest Pacific

Zaslavskaya, N. I.; Pudovkin, Alexander I.

doi:10.1007/s11177-005-0087-8

Cited by 8 publications

(6 citation statements)

References 39 publications

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“…Previous studies of the two direct‐developing species, L. sitkana and L. subrotundata , have also shown significant spatial genetic differentiation at APN54 on a 2‐ to 3‐km geographical scale in Barkley Sound, British Columbia, Canada (Sokolova & Boulding 2004a). Moreover, a larger‐scale study of L. sitkana by Zaslavskaya & Pudovkin (2005) found significant genetic differentiation at four allozyme loci [global G ST ( analogous to F ST ) = 0.31] over a 525‐km geographical scale along the northwestern Pacific coast. Our observed significant spatial genetic structure at an 11‐ to 65‐km scale in both direct‐developing species, L. sitkana and L. subrotundata , is consistent with the previous studies, supporting the hypothesis that their gene flow is low because of their limited dispersal ability.…”

Section: Discussionmentioning

confidence: 99%

Spatial and temporal population genetic structure of four northeastern Pacific littorinid gastropods: the effect of mode of larval development on variation at one mitochondrial and two nuclear DNA markers

Lee

Boulding

2009

Molecular Ecology

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We investigated the effect of development mode on the spatial and temporal population genetic structure of four littorinid gastropod species. Snails were collected from the same three sites on the west coast of Vancouver Island, Canada in 1997 and again in 2007. DNA sequences were obtained for one mitochondrial gene, cytochrome b (Cyt b), and for up to two nuclear genes, heat shock cognate 70 (HSC70) and aminopeptidase N intron (APN54). We found that the mean level of genetic diversity and long-term effective population sizes (N(e)) were significantly greater for two species, Littorina scutulata and L. plena, that had a planktotrophic larval stage than for two species, Littorina sitkana and L. subrotundata, that laid benthic egg masses which hatched directly into crawl-away juveniles. Predictably, two poorly dispersing species, L. sitkana and L. subrotundata, showed significant spatial genetic structure at an 11- to 65-km geographical scale that was not observed in the two planktotrophic species. Conversely, the two planktotrophic species had more temporal genetic structure over a 10-year interval than did the two direct-developing species and showed highly significant temporal structure for spatially pooled samples. The greater temporal genetic variation of the two planktotrophic species may have been caused by their high fecundity, high larval dispersal, and low but spatially correlated early survivorship. The sweepstakes-like reproductive success of the planktotrophic species could allow a few related females to populate hundreds of kilometres of coastline and may explain their substantially larger temporal genetic variance but lower spatial genetic variance relative to the direct-developing species.

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Section: Discussionmentioning

confidence: 99%

Spatial and temporal population genetic structure of four northeastern Pacific littorinid gastropods: the effect of mode of larval development on variation at one mitochondrial and two nuclear DNA markers

Lee

Boulding

2009

Molecular Ecology

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“…Among NEP species with spatial patterns of genetic diversity that are consistent with recent range expansions, several have geographic ranges extending to the northwestern Pacific (NWP) (e.g., Vermeij, Palmer & Lindberg, 1990), leaving open the question that populations in Asia may have served as a glacial refugium for NEP populations of amphi-Pacific taxa (Vermeij, 1989). For one such species, the Sitka Periwinkle Littorina sitkana (Philippi 1846), population genetic sub-structuring is nearly non-existent in the NEP (Kyle & Boulding, 2000; Sokolova & Boulding, 2004; Lee & Boulding, 2009; Marko et al, 2010; Botta et al, 2014), but much greater over relatively small spatial scales in the NWP (Nohara, 1999; Zaslavskaya & Pudovkin, 2005; Azuma et al, 2017). Based on these contrasting patterns of diversity and the observation that the most common mtDNA haplotype in the NEP is identical to one found in the NWP, Azuma et al (2017) proposed that NEP populations of L. sitkana must have been derived from the NWP following the end of the last glacial.…”

Section: Introductionmentioning

confidence: 99%

Geographic origin and timing of colonization of the Pacific Coast of North America by the rocky shore gastropodLittorina sitkana

Marko

Zaslavskaya

2019

PeerJ

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The demographic history of a species can have a lasting impact on its contemporary population genetic structure. Northeastern Pacific (NEP) populations of the rocky shore gastropod Littorina sitkana have very little mitochondrial DNA (mtDNA) sequence diversity and show no significant population structure despite lacking dispersive planktonic larvae. A contrasting pattern of high mtDNA diversity in the northwestern Pacific (NWP) suggests that L. sitkana may have recently colonized the NEP from the NWP via stepping-stone colonization through the Aleutian-Commander Archipelago (ACA) following the end of the last glacial 20,000 years ago. Here, we use multi-locus sequence data to test that hypothesis using a combination of descriptive statistics and population divergence modeling aimed at resolving the timing and the geographic origin of NEP populations. Our results show that NEP populations share a common ancestor with a population of L. sitkana on the Kamchatka Peninsula ∼46,900 years ago and that NEP populations diverged from each other ∼21,400 years ago. A more recent population divergence between Kamchatka and NEP populations, than between Kamchatka and other populations in the NWP, suggests that the ACA was the most probable dispersal route. Taking into account the confidence intervals for the estimates, we conservatively estimate that L. sitkana arrived in the NEP between 107,400 and 4,100 years ago, a range of dates that is compatible with post-glacial colonization of the NEP. Unlike other congeners that are relatively abundant in the Pleistocene fossil record of the NEP, only one report of L. sitkana exists from the NEP fossil record. Although broadly consistent with the molecular data, the biogeographic significance of these fossils is difficult to evaluate, as the shells cannot be distinguished from the closely-related congener L. subrotundata.

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“…Among NEP species with spatial patterns of genetic diversity that are consistent with recent range expansions, several have geographic ranges extending to the northwestern Pacific (NWP) (e.g., Vermeij et al 1990), leaving open the question that populations in Asia may have served as a glacial refugium for NEP populations of amphi-Pacific taxa (Vermeij 1989). For one such species, the Sitka Periwinkle Littorina sitkana (Philippi 1846), population genetic sub-structuring is nearly non-existent in the NEP (Kyle & Boulding 2000;Sokolova & Boulding 2004;Lee & Boulding 2009;Marko et al 2010;Botta et al 2014), but much greater over relatively small spatial scales in the NWP (Nohara 1999;Zaslavskaya & Pudovkin 2005;Azuma et al 2017). Based on these contrasting patterns of diversity and the observation that the most common mtDNA haplotype in the NEP is identical to one found in the NWP, Azuma et al (2017) proposed that NEP populations of L. sitkana must have been derived from the NWP following the end of the last glacial.…”

Section: Introductionmentioning

confidence: 99%

Peer Review #1 of "Geographic origin and timing of colonization of the Pacific Coast of North America by the rocky shore gastropod Littorina sitkana (v0.1)"

Johannesson¹

2019

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The demographic history of a species can have a lasting impact on its contemporary population genetic structure. Northeastern Pacific (NEP) populations of the rocky shore gastropod Littorina sitkana have very little mitochondrial DNA (mtDNA) sequence diversity and show no significant population structure despite lacking dispersive planktonic larvae. A contrasting pattern of high mtDNA diversity in the northwestern Pacific (NWP) suggests that L. sitkana may have recently colonized the NEP from the NWP via stepping-stone colonization through the Aleutian-Commander Archipelago (ACA) following the end of the last glacial 20,000 years ago. Here, we use multi-locus sequence data to test that hypothesis using a combination of descriptive statistics and population divergence modeling aimed at resolving the timing and the geographic origin of NEP populations. Our results show that NEP populations share a common ancestor with a population of L. sitkana on the Kamchatka Peninsula ~46,900 years ago and that NEP populations diverged from each other ~21,400 years ago. A more recent population divergence between Kamchatka and NEP populations, than between Kamchatka and other populations in the NWP, suggests that the ACA was the most probable dispersal route. Taking into account the confidence intervals for the estimates, we conservatively estimate that L. sitkanaarrived in the NEP between 107,400 and 4,100 years ago, a range of dates that is compatible with post-glacial colonization of the NEP. Unlike other congeners that are relatively abundant in the Pleistocene fossil record of the NEP, only one report of L. sitkana exists from the NEP fossil record. Although broadly consistent with the molecular data, the biogeographic significance of these fossils is difficult to evaluate, as the shells cannot be distinguished from the closely-related congener L. subrotundata.

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Macrogeographic genetic variability in the Gastropod Mollusk Littorina sitkana from the Northwest Pacific

Cited by 8 publications

References 39 publications

Spatial and temporal population genetic structure of four northeastern Pacific littorinid gastropods: the effect of mode of larval development on variation at one mitochondrial and two nuclear DNA markers

Spatial and temporal population genetic structure of four northeastern Pacific littorinid gastropods: the effect of mode of larval development on variation at one mitochondrial and two nuclear DNA markers

Geographic origin and timing of colonization of the Pacific Coast of North America by the rocky shore gastropodLittorina sitkana

Peer Review #1 of "Geographic origin and timing of colonization of the Pacific Coast of North America by the rocky shore gastropod Littorina sitkana (v0.1)"

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