Cryptic speciation in Southern Ocean Aequiyoldia eightsii (Jay, 1839): Mio-Pliocene trans-Drake Passage separation and diversification

González‐Wevar, Claudio A.; Gérard, Karin; Rosenfeld, Sebastián; Saucède, Thomas; Naretto, Javier; Diaz, A Mendoza; Morley, Simon A.; Brickle, Paul; Poulin, Élie

doi:10.1016/j.pocean.2018.09.004

Cited by 23 publications

(50 citation statements)

References 102 publications

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“…In this study, we found no evidence of significant migration between Antarctica and South American populations of the bivalve A. eightsii confirming the results found by previous studies based on fewer markers (e.g. [ 13 , 44 ]). Although some results from the DAPC analysis yielded conflicting results by showing two individuals from the South American region with membership probabilities mixed with Antarctic populations, all other analyses (RA x ML phylogeny and S tructure ) showed a strong differentiation between these regions.…”

Section: Discussionsupporting

confidence: 91%

“…(e.g. [13,44]). Although some results from the DAPC analysis yielded conflicting results by showing two individuals from the South American region with membership probabilities mixed with Antarctic populations, all other analyses (RAXML phylogeny and STRUCTURE) showed a strong differentiation between these regions.…”

Section: Discussionmentioning

confidence: 99%

“…Genomic DNA was extracted with the Qiagen DNeasy Blood & Tissue kit, following the manufacturer's protocol. Mitochondrial DNA (mtDNA) data were collected to conduct a preliminary assessment of phylogeographic patterns and to confirm a single evolutionary lineage, given that multiple lineages have been documented previously [ 13 ]. A 629 bp fragment of the cytochrome c oxidase subunit I (COI) gene was amplified using universal primers from [ 18 ] with final concentrations for polymerase chain reaction components per 25 µl reaction as follows: 25 ng template DNA, 0.25 µM of each primer, 0.625 units of GoTaq DNA polymerase (Promega, Madison, WI, USA), 0.1 mM of each dNTP, 2.5 µl of 10 reaction buffer and 2.5 mM MgCl 2 .…”

Section: Methodsmentioning

confidence: 99%

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Gene flow in the Antarctic bivalveAequiyoldia eightsii(Jay, 1839) suggests a role for the Antarctic Peninsula Coastal Current in larval dispersal

et al. 2020

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The Antarctic Circumpolar Current (ACC) dominates the open-ocean circulation of the Southern Ocean, and both isolates and connects the Southern Ocean biodiversity. However, the impact on biological processes of other Southern Ocean currents is less clear. Adjacent to the West Antarctic Peninsula (WAP), the ACC flows offshore in a northeastward direction, whereas the Antarctic Peninsula Coastal Current (APCC) follows a complex circulation pattern along the coast, with topographically influenced deflections depending on the area. Using genomic data, we estimated genetic structure and migration rates between populations of the benthic bivalve Aequiyoldia eightsii from the shallows of southern South America and the WAP to test the role of the ACC and the APCC in its dispersal. We found strong genetic structure across the ACC (between southern South America and Antarctica) and moderate structure between populations of the WAP. Migration rates along the WAP were consistent with the APCC being important for species dispersal. Along with supporting current knowledge about ocean circulation models at the WAP, migration from the tip of the Antarctic Peninsula to the Bellingshausen Sea highlights the complexities of Southern Ocean circulation. This study provides novel biological evidence of a role of the APCC as a driver of species dispersal and highlights the power of genomic data for aiding in the understanding of the influence of complex oceanographic processes in shaping the population structure of marine species.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Gene flow in the Antarctic bivalveAequiyoldia eightsii(Jay, 1839) suggests a role for the Antarctic Peninsula Coastal Current in larval dispersal

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“…However, the data analysis and/or interpretation of preliminary evidence were constrained by various factors, leaving the refugia hypotheses unanswered. Some studies suggested that evidence of glacial survival is reflected by overall genetic patterns but did not propose explicit locations of glacial refugia (Raupach et al 2010, Dömel et al 2015, Sromek et al 2015, Leiva et al 2018, Miller et al 2018), while others had limited sample coverage (Janko et al 2007, Baird et al 2012, Díaz et al 2012, Wiernes et al 2013) and were confounded by discoveries of multiple cryptic species in datasets (Wilson et al 2009, Allcock et al 2011, Baird et al 2011, Wiernes et al 2013, Harder et al 2016, González‐Wevar et al 2019).…”

Section: What Is the Current Molecular Evidence Of Glacial Refugia Inmentioning

confidence: 99%

Detecting glacial refugia in the Southern Ocean

et al. 2020

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Throughout the Quaternary, the continental‐based Antarctic ice sheets expanded and contracted repeatedly. Evidence suggests that during glacial maxima, grounded ice eliminated most benthic (bottom‐dwelling) fauna across the Antarctic continental shelf. However, paleontological and molecular evidence indicates most extant Antarctica benthic taxa have persisted in situ throughout the Quaternary. Where and how the Antarctic benthic fauna survived throughout repeated glacial maxima remain mostly hypothesised. If understood, this would provide valuable insights into the ecology and evolution of Southern Ocean biota over geological timescales. Here we synthesised and appraised recent studies and presented an approach to demonstrate how genetic data can be effective in identifying where and how Antarctic benthic fauna survived glacial periods. We first examined the geological and ecological evidence for how glacial periods influenced past species demography in order to provide testable frameworks for future studies. We outlined past ice‐free areas from Antarctic ice sheet reconstructions that could serve as glacial refugia and discussed how benthic fauna with pelagic or non‐pelagic dispersal strategies moved into and out of glacial refugia. We also reviewed current molecular studies and collated proposed locations of Southern Ocean glacial refugia on the continental shelf around Antarctica, in the deep sea, and around sub‐Antarctic islands. Interestingly, the proposed glacial refugia based on molecular data generally do not correspond to the ice‐free areas identified by Antarctic ice sheet reconstructions. The potential biases in sampling and in the choice of molecular markers in current literature are discussed, along with the future directions for employing testable frameworks and genomic methods in Southern Ocean molecular studies. Continued data syntheses will elucidate greater understanding of where and how Southern Ocean benthic fauna persisted throughout glacial periods and provide insights into their resilience against climate changes in the future.

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“…Recent studies using molecular tools have observed that several species co-distributed in the Antarctic Peninsula and South America actually belong to different lineages, with evolutionary units separated by millions of years ( Poulin et al 2014 ). This has been mainly observed in species of the genus Aequiyoldia Soot-Ryen, 1951 ( González-Wevar et al 2019 ).…”

Section: Discussionmentioning

confidence: 98%

Diversity of benthic marine mollusks of the Strait of Magellan, Chile (Polyplacophora, Gastropoda, Bivalvia): a historical review of natural history

Aldea¹,

Novoa²,

Alcaino³

et al. 2020

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An increase in richness of benthic marine mollusks towards high latitudes has been described on the Pacific coast of Chile in recent decades. This considerable increase in diversity occurs specifically at the beginning of the Magellanic Biogeographic Province. Within this province lies the Strait of Magellan, considered the most important channel because it connects the South Pacific and Atlantic Oceans. These characteristics make it an interesting area for marine research; thus, the Strait of Magellan has historically been the area with the greatest research effort within the province. However, despite efforts there is no comprehensive and updated list of the diversity of mollusks within the Strait of Magellan up to now. This study consisted of a complete bibliographic review of all available literature that included samples of mollusks in the Strait of Magellan. More than 300 articles were reviewed, covering 200 years of scientific knowledge. There were 2579 records belonging to 412 taxa, of which 347 are valid species. Of the total valid species, 44 (~13%) are considered of doubtful presence in the Strait. This work increases the known richness of mollusks of the Strait of Magellan by 228%; it is also the first report that integrates all available diversity studies of the three most speciose classes of benthic mollusks (Gastropoda, Bivalvia and Polyplacophora) from the Strait of Magellan.

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Cryptic speciation in Southern Ocean Aequiyoldia eightsii (Jay, 1839): Mio-Pliocene trans-Drake Passage separation and diversification

Cited by 23 publications

References 102 publications

Gene flow in the Antarctic bivalveAequiyoldia eightsii(Jay, 1839) suggests a role for the Antarctic Peninsula Coastal Current in larval dispersal

Gene flow in the Antarctic bivalveAequiyoldia eightsii(Jay, 1839) suggests a role for the Antarctic Peninsula Coastal Current in larval dispersal

Detecting glacial refugia in the Southern Ocean

Diversity of benthic marine mollusks of the Strait of Magellan, Chile (Polyplacophora, Gastropoda, Bivalvia): a historical review of natural history

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