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Diversity of macrofaunal Mollusca of the abyssal Vema Fracture Zone and hadal Puerto Rico Trench, tropical North Atlantic

Linse, Katrin; Schwabe, Enrico. 2018 Diversity of macrofaunal Mollusca of the abyssal Vema Fracture Zone and hadal Puerto Rico Trench, tropical North Atlantic. Deep-Sea Research Part II: Topical Studies in Oceanography, 148. 45-53. https://doi.org/10.1016/j.dsr2.2017.02.001

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This article has been accepted for publication and will appear in a revised form in Deep Sea Research II, published by Elsevier. Copyright Elsevier.
Diversity of macrofaunal Mollusca of the abyssal Vema Fracture Zone AAM.pdf - Accepted Version

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Abstract/Summary

While biodiversity patterns of Atlantic deep-sea bivalves and gastropods have served as model taxa for setting global latitudinal and bathymetric hypotheses, less is known on abyssal, amphi-Atlantic molluscan assemblage compositions. The Vema-TRANSIT expedition sampled 17 stations in the Vema Fracture Zone (VFZ) and the Puerto Rico Trench (PRT) by epibenthic sledge. These samples comprised a total of 1333 specimens and 64 morphospecies of the classes Caudofoveata (7 species), Solenogastres (7 spp.), Bivalvia (22 spp.), Gastropoda (24 spp.), and Scaphopoda (4 spp.) while Cephalopoda, Monoplacophora and Polyplacophora were absent. The majority of species was rare with 21 uniques (32.8% of all species) and 10 duplicates (15.6% of all species) and of these 15 (48% of rare/23.4% of all species) morphospecies were singletons and 8 (25.8% of rare/12.5% of all species) morphospecies were doubletons. Overall bivalves (686 specimens) were most abundant, followed by scaphopods (314 spec.), while solenogastres (180 spec.), caudofoveates (86 spec.) and gastropods (67 spec.) were less abundant. The abyssal macro-molluscan species composition did not vary significantly between the eastern and western Atlantic sides of the VFZ while abundances standardized to 1000 m2 trawled area were higher on the eastern side. The abyssal PRT stations resembled the VFZ ones in species composition and abundances, in the latter the eastern VFZ. The hadal PRT differed in species composition from the abyssal VFZ and PRT and abundances were similarly low like the western VFZ. The Mid-Atlantic Ridge appeared not to be a barrier for the dispersal of the mostly lecitotrophic or plankotrophic larval stages of the reported molluscan species in this study.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.1016/j.dsr2.2017.02.001
Programmes: BAS Programmes > BAS Programmes 2015 > Biodiversity, Evolution and Adaptation
ISSN: 09670645
Additional Keywords: Atlantic, bivalvia, gastropoda, scaphopoda, species richness
Date made live: 13 Feb 2017 11:56 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/516177

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