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Onshore–offshore distribution of Thecosomata (Gastropoda) in the Benguela Current upwelling region off Namibia: species diversity and trophic position

Published online by Cambridge University Press:  26 March 2013

Rolf Koppelmann ,
Björn Kullmann ,
Niko Lahajnar ,
Bettina Martin  and
Volker Mohrholz
Rolf Koppelmann*
Affiliation:
Universität Hamburg, Centrum für Erdsystemforschung und Nachhaltigkeit, Institut für Hydrobiologie und Fischereiwissenschaft, Große Elbstraße 133, 22767 Hamburg, Germany
Björn Kullmann
Affiliation:
Universität Hamburg, Centrum für Erdsystemforschung und Nachhaltigkeit, Institut für Hydrobiologie und Fischereiwissenschaft, Große Elbstraße 133, 22767 Hamburg, Germany
Niko Lahajnar
Affiliation:
Universität Hamburg, Centrum für Erdsystemforschung und Nachhaltigkeit, Institut für Biogeochemie und Meereschemie, Bundesstraße 55, 20146 Hamburg, Germany
Bettina Martin
Affiliation:
Universität Hamburg, Centrum für Erdsystemforschung und Nachhaltigkeit, Institut für Hydrobiologie und Fischereiwissenschaft, Große Elbstraße 133, 22767 Hamburg, Germany
Volker Mohrholz
Affiliation:
Leibniz-Institut für Ostseeforschung Warnemünde, Seestraße 15, 18119 Rostock, Germany
*
Correspondence should be addressed to: Rolf Koppelmann, Universität Hamburg, Centrum für Erdsystemforschung und Nachhaltigkeit, Institut für Hydrobiologie und Fischereiwissenschaft, Große Elbstraße 133, 22767 Hamburg, Germany email: [email protected]
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Abstract

Many Thecosomata (Gastropoda) produce an aragonite shell and are potentially threatened by the increasing ocean acidification. Information about these species is very important for future monitoring of the fate of this group. This paper investigates the distribution, species composition and trophic role of Thecosomata along a transect from the coast into the open ocean off Walvis Bay, Namibia, in September 2010 and January/February 2011. Twenty species were detected, but three taxa (Limacina bulimoides, Limacina inflata and Desmopterus papilio) dominated the community with more than 80% of the total standing stock. Diel vertical migration was observed for both Limacina taxa with higher concentrations in surface waters during night. Desmopterus papilio revealed almost no day/night differences. The highest diversities and abundances were detected at the slope and offshore stations, indicating the oceanic preference of this group; some taxa aggregated at the shelf–open ocean interface. δ15N measurements confirmed the first trophic level of this group; however, significant differences were detected between seasons with higher values in February 2011. This can be related to differences in seston values as the primary food source. Possible biogeochemical causes for these differences like an exhaustion of the nitrate pool or denitrification processes under suboxic conditions are discussed.

Keywords

ThecosomataPteropodadistributioncommunity analysisstable isotopesupwellingocean acidificationBenguelaNamibia
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 93 , Issue 6 , September 2013 , pp. 1625 - 1640
Copyright
Copyright © Marine Biological Association of the United Kingdom 2013 

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