Genetic population structure in Nacella magellanica: Evidence of rapid range expansion throughout the entire species distribution on the Atlantic coast

Aranzamendi, María Carla de; Bastida, Ricardo; Gardenal, Cristina N.

doi:10.1016/j.jembe.2014.06.008

Cited by 16 publications

(13 citation statements)

References 54 publications

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“…Populations along temperate areas of the Argentinean province also showed low levels of genetic diversity and represent a continuity of the diversity found along the Magellan province. Absence of genetic differentiation between areas that were differentially affected by ice expansion and contraction along the Pacific and Atlantic margins of Magellan was also recorded in the pulmonate Siphonaria lateralis 21 and in the keystone patellogastropod Nacella magellanica 20,23 . Marginal posterior probability distribution of splitting time (t) estimates between main genetic clusters C1 and C2 expressed in years.…”

Section: Discussionmentioning

confidence: 90%

Quaternary ice sheets and sea level regression drove divergence in a marine gastropod along Eastern and Western coasts of South America

Iriarte

González‐Wevar

Segovia

et al. 2020

Sci Rep

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the southern coastline of South America is a remarkable area to evaluate how Quaternary glacial processes impacted the demography of the near-shore marine biota. Here we present new phylogeographic analyses in the pulmonate Siphonaria lessonii across its distribution, from northern Chile in the Pacific to Uruguay in the Atlantic. contrary to our expectations, populations from the southwestern Atlantic, an area that was less impacted by ice during glacial maxima, showed low genetic diversity and evidence of recent expansion, similar to the patterns recorded in this study across heavily ice-impacted areas in the Pacific Magellan margin. We propose that Atlantic and Pacific shallow marine hard-substrate benthic species were both affected during the Quaternary in South America, but by different processes. At higher latitudes of the southeast Pacific, ice-scouring drastically affected S. lessonii populations compared to non-glaciated areas along the chile-peru province where the species was resilient. in the southwest Atlantic, S. lessonii populations would have been dramatically impacted by the reduction of near-shore rocky habitat availability as a consequence of glacio-eustatic movements. the increase of gravelly and rocky shore substrates in the southwest Atlantic supports a hypothesis of glacial refugia from where the species recolonized lower latitudes across the Atlantic and Pacific margins. Our results suggest that current patterns of genetic diversity and structure in near-shore marine benthic species do not solely depend on the impact of Quaternary glacial ice expansions but also on the availability of suitable habitats and life-history traits, including developmental mode, bathymetry and the likelihood of dispersal by rafting. Quaternary ice sheet expansion and contraction during the Last Glacial Maximum (LGM), between 23,000 and 18,000 years before present, triggered major climate and environmental changes that strongly affected the distribution of the biota worldwide 1,2. Under the Expansion-Contraction (E-C) model of Pleistocene biogeography, cold-temperate species contracted their distribution ranges towards lower latitude glacial refugia located in less ice-impacted or non-glaciated areas 3. During interglacial periods they recolonized higher latitudes through range expansions following deglaciation processes 4-6. This simple E-C model provides a straightforward paradigm to test population demographic hypotheses through the Quaternary, and phylogeographic studies have helped to understand better the response of species to major climate changes during this period by recognizing distribution range shifts, potential refugial areas and recolonization routes 7-9 .

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Section: Discussionmentioning

confidence: 90%

Quaternary ice sheets and sea level regression drove divergence in a marine gastropod along Eastern and Western coasts of South America

Iriarte

González‐Wevar

Segovia

et al. 2020

Sci Rep

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“…Several marine coastal species are distributed across these four biogeographic provinces, but only a few of them had been subjected to population genetic studies. Most of these studies had been restricted to the Pacific or the Atlantic Ocean only and/or to a single molecular marker, usually a mitochondrial locus (Cárdenas et al, 2009;Fraser et al, 2010;González-Wevar et al, 2012;de Aranzamendi et al, 2014;Hüne et al, 2014;Nuñez et al, 2015). Contrastingly, many more phylogeographic studies have addressed the genetic consequences of Quaternary glacial cycles in the coastal marine fauna of the Northern Hemisphere (reviewed in Provan, 2013).…”

Section: Introductionmentioning

confidence: 99%

Genetic relationships between Atlantic and Pacific populations of the notothenioid fish Eleginops maclovinus: the footprints of Quaternary glaciations in Patagonia

et al. 2015

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The genetic relationships between the Pacific and the Atlantic populations of marine coastal biota in Southern South America have been analyzed in few studies, most of them relying on a single mitochondrial locus. We analyzed 10 polymorphic microsatellite loci, isolated from a dinucleotide-enriched Eleginops maclovinus genomic library, in a total of 240 individuals (48 from each of 5 sampled sites: 2 Atlantic, 2 Pacific and 1 in Beagle Channel). The results were contrasted against a previous work on the same species with mitochondrial DNA (mtDNA). Observed heterozygosity within localities ranged from 0.85 to 0.88 with the highest overall number of alleles observed at the northernmost locality on the Pacific side (Concepción), but no clear geographic pattern arose from the data. On the other hand, the number of private alleles was negatively correlated with latitude (Spearman's r s test, P = 0.017). Among-population variance was low but significant (1.35%; Po0.0001, analysis of molecular variance (AMOVA)) and low genetic differentiation between populations was observed (pairwise F ST values ranged from 0 to 0.021). A Mantel test revealed a significant correlation between geographic distances and F ST (r = 0.56, P = 0.047). This could be partially accounted by the Atlantic versus Pacific population differentiation detected in three different analyses (STRUCTURE, SAMOVA (Spatial Analysis of MOlecular VAriance) and a population phylogeny). The observed pattern is compatible with a history of separation into two glacial refugia that was better captured by the multilocus microsatellite data than by the mtDNA analysis.

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“…Most of these studies evidenced clear patterns of postglacial recolonization and recognized the presence of Quaternary glacial refugia on the East side of the Andes, along the Patagonian Steppe [26,29], with refugia on the West side of Andes both within [23,29,38] and outside of the glacier limits [26,34]. Absence of genetic structure and a strong signal of recent demographic growth recorded in shallow Patagonian marine benthic invertebrates support the hypothesis of rapid postglacial expansion [20–22,25]. Species with high dispersive potential (i.e., Durvillaea antarctica and Macrocystis pyrifera ) recolonized Patagonia since the LGM from geographically distant regions [46,48] evidence of the major role of long-distance dispersal in the biogeography of Subantarctic near-shore marine benthic organisms [49–51].…”

Section: Introductionmentioning

confidence: 92%

Genetics, Gene Flow, and Glaciation: The Case of the South American Limpet Nacella mytilina

et al. 2016

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Glacial episodes of the Quaternary, and particularly the Last Glacial Maximum (LGM) drastically altered the distribution of the Southern-Hemisphere biota, principally at higher latitudes. The irregular coastline of Patagonia expanding for more than 84.000 km constitutes a remarkable area to evaluate the effect of Quaternary landscape and seascape shifts over the demography of near-shore marine benthic organisms. Few studies describing the biogeographic responses of marine species to the LGM have been conducted in Patagonia, but existing data from coastal marine species have demonstrated marked genetic signatures of post-LGM recolonization and expansion. The kelp-dweller limpet Nacella mytilina is broadly distributed along the southern tip of South America and at the Falkland/Malvinas Islands. Considering its distribution, abundance, and narrow bathymetry, N. mytilina represents an appropriate model to infer how historical and contemporary processes affected the distribution of intraspecific genetic diversity and structure along the southern tip of South America. At the same time, it will be possible to determine how life history traits and the ecology of the species are responsible for the current pattern of gene flow and connectivity across the study area. We conducted phylogeographic and demographic inference analyses in N. mytilina from 12 localities along Pacific Patagonia (PP) and one population from the Falkland/Malvinas Islands (FI). Analyses of the mitochondrial gene COI in 300 individuals of N. mytilina revealed low levels of genetic polymorphism and the absence of genetic differentiation along PP. In contrast, FI showed a strong and significant differentiation from Pacific Patagonian populations. Higher levels of genetic diversity were also recorded in the FI population, together with a more expanded genealogy supporting the hypothesis of glacial persistence of the species in these islands. Haplotype genealogy, and mismatch analyses in the FI population recognized an older and more complex demographic history than in PP. Demographic reconstructions along PP suggest a post-LGM expansion process (7.5 ka), also supported by neutrality tests, mismatch distribution and maximum parsimony haplotype genealogies. Migration rate estimations showed evidence of asymmetrical gene flow from PP to FI. The absence of genetic differentiation, the presence of a single dominant haplotype, high estimated migration rates, and marked signal of recent demographic growth, support the hypothesis of rapid post-glacial expansion in N. mytilina along PP. This expansion could have been sustained by larval and rafting-mediated dispersal of adults from northernmost populations following the Cape Horn Current System. Marked genetic differentiation between PP and FI could be explained through differences in their respective glacial histories. During the LGM, Pacific Patagonia (PP) was almost fully covered by the Patagonian Ice Sheet, while sheet coverage in the FI ice was restricted to small cirques and valleys. As previously recorded ...

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Genetic population structure in Nacella magellanica: Evidence of rapid range expansion throughout the entire species distribution on the Atlantic coast

Cited by 16 publications

References 54 publications

Quaternary ice sheets and sea level regression drove divergence in a marine gastropod along Eastern and Western coasts of South America

Quaternary ice sheets and sea level regression drove divergence in a marine gastropod along Eastern and Western coasts of South America

Genetic relationships between Atlantic and Pacific populations of the notothenioid fish Eleginops maclovinus: the footprints of Quaternary glaciations in Patagonia

Genetics, Gene Flow, and Glaciation: The Case of the South American Limpet Nacella mytilina

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