Phylogeographic Estimates of Colonization of The Deep Atlantic by The Protobranch Bivalve Nucula Atacellana

Abstract

Abstract:The Pleistocene and post−Pleistocene evolutionary history of many North Atlan− tic intertidal invertebrate species is well known, but the evolutionary history of the deep North Atlantic fauna is poorly understood, specifically whether colonization of the deep North Atlantic paralleled the patterns observed in shallow water. Contemporary pan−Atlan− tic species distributions could result from several colonization pathways that connected dif− ferent regions of the Atlantic at different times (e.g. Arctic, Antarctic or Panamanian path− ways). To test potential colonization pathways we quantified geographic variation in nu− clear and mitochondrial markers from Atlantic samples of Nucula atacellana, a pan−Atlan− tic deep−sea protobranch bivalve, using N. profundorum in the eastern central Pacific as an outgroup. We combined existing 16S data from North and South Atlantic populations of N. atacellana with new sequences of 16S, COI, and an intron of calmodulin from those popu− lations, and newly sampled populations near Iceland. Population genetic analyses indicated a subtropical expansion via the Central American Seaway. We found no evidence for Transarctic migration to the Atlantic in N. atacellana, which suggests that colonization pathways may differ significantly between shallow− and deep−water fauna.

Abyssal fauna of the UK-1 polymetallic nodule exploration area, Clarion-Clipperton Zone, central Pacific Ocean: Mollusca

“…12) Nucula profundorum and the Atlantic Nucula atacellana Schenck, 1939 are well supported sister species. However the N. profundorum identified from the present samples differs genetically from the N. profundorum record in GenBank (accession nr KJ950274; Jennings and Etter 2014) which we believe may be misassigned. That sample came from 1045 m in the north eastern Pacific off San Diego (Figure 10).…”

Adult life strategy affects distribution patterns in abyssal isopods – implications for conservation in Pacific nodule areas

“…or even show a pan-Atlantic distribution(Jennings & Etter 2014). The same pattern is observed for cirriped crustaceans distributing along currents in the South Pacific/Indian Ocean along the hydrothermal vent 410 chains(Suzuki et al 2018) or along currents in the North Atlantic underwater mountain chains (like the acorn barnacle Bathylasma cf.…”

Preface—biodiversity of Icelandic waters

“…Several resulting publications were compiled in the first IceAGE special issue published by Polish Polar Research in 2014. It included many descriptions of newly discovered species combined with taxonomic and biodiversity studies (Jóźwiak 2014;Mikkelsen and Todt 2014;Parapar et al 2014;Schnurr and Malyutina 2014;Todt and Kocot 2014;Yasuhara et al 2014), studies combining taxonomy and phylogeny using morphological and molecular tools (Błażewicz-Paszkowycz et al 2014;Khodami et al 2014), phylogeographic studies on selected taxa (Brix et al 2014b;Jennings and Etter 2014), and a publication with a modeling approach providing a GIS layer on sediment characteristics .…”