Latitudinal changes in siphonophore assemblages across the Atlantic sector of the Southern Ocean期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Latitudinal changes in siphonophore assemblages across the Atlantic sector of the Southern Ocean

Authors:	D Kuyper D Thibault MJ Gibbons

Institution:	1. Department of Biodiversity and Conservation Biology, University of the Western Cape, Cape Town, South Africa kuyperd@gmail.comhttps://orcid.org/0000-0001-5784-4157;3. Aix Marseille Université, Université de Toulon, CNRS, IRD, MIO, UM 110, Marseille, France;4. Institut de Recherche pour le Développement (IRD), MARBEC, International Centre for Education, Marine and Atmospheric Sciences Over Africa (LMI ICEMASA), France;5. Department of Environment, Forestry and Fisheries (DEFF): Oceans and Coasts, Cape Town, South Africa https://orcid.org/0000-0002-0528-1062;6. Department of Biodiversity and Conservation Biology, University of the Western Cape, Cape Town, South Africa https://orcid.org/0000-0002-8320-8151

Abstract:	Siphonophores are commonly considered to be useful indicators of water masses and water-mass movement, but their employment as such across the wider Southern Ocean has not so far been attempted. We redress this here using archived samples, collected during January–February 1993 along a transect from Cape Town to the South African National Antarctic Expedition (SANAE) base in Antarctica, and compare the patterns generated with those determined from a prior analysis of whole assemblages at lower taxonomic resolution. Twenty-one species were identified from 18 of the original 53 samples collected, and two distinct assemblages were confirmed as separated by the Sub-Antarctic Front. That to the south was characterised by low diversity and high abundance and was dominated by cold-water specialists, whereas that to the north comprised a larger number of subtropical and temperate species at low abundance. Assemblage structure was strongly influenced by the mixed layer depth, sea surface salinity and chlorophyll a concentration, as well as mesozooplankton biomass. Congruence with the whole-assemblage study was high, indicating that this taxon can be suitably employed as a proxy in studies such as this. The study emphasises the value of archived plankton samples and makes a plea for better curation.

Keywords:	archived plankton samples biogeography Dimophyes arctica diversity mesozooplankton biomass Muggiaea bargmannae oceanography Sub-Antarctic Front

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