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The influence of flow velocity and food concentration on Lophelia pertusa (Scleractinia) zooplankton capture rates

Journal article
Authors A. Purser
Ann I. Larsson
L. Thomsen
D. van Oevelen
Published in Journal of Experimental Marine Biology and Ecology
Volume 395
Issue 1-2
Pages 55-62
ISSN 0022-0981
Publication year 2010
Published at Department of Marine Ecology, Tjärnö Marine Biological Laboratory
Department of Marine Ecology
Pages 55-62
Language en
Links dx.doi.org/10.1016/j.jembe.2010.08....
Keywords Carbon storage, Cold-water coral, Feeding rate, Flume, Lophelia pertusa, CORAL STYLOPHORA-PISTILLATA, COLD-WATER CORALS, NE ATLANTIC, MADRACIS-MIRABILIS, NORTHEAST ATLANTIC, CARBONATE MOUNDS, PREY CAPTURE, SUPPLY MECHANISMS, PARTICLE CAPTURE, NORWEGIAN SHELF
Subject categories Ecology

Abstract

Lophelia pertusa is the most significant framework building scleractinian coral in European seas, yet the reproductive strategy, longevity, growth and food capture rates for the species remain poorly understood. In this study an experimental investigation into the ability of L pertusa to capture zooplankton from suspension was conducted. By direct ROV sampling approximately 350 L pertusa polyps were collected from the Tisler reef, Norway and maintained under temperature controlled conditions in recirculating flumes. These polyps were subdivided into three replicate groups of similar to 120 polyps and maintained in waters with flow velocities of 2.5 cm s(-1) or 5.0 cm s(-1). Suspended Artemia sauna nauplii food concentrations of between 345 and 1035 A. sauna l(-1) were introduced. L pertusa net capture rates were assessed by monitoring the reduction in suspended A. sauna concentration in each flume over 24 h. Maximum net capture rates were higher in flumes with a 2.5 cm s(-1) flow regime, at 73.3 +/- 2.0 A. salina polyp(-1) h(-1) (mean +/- SD) than those with 5 cm s(-1) flow (19.8 +/- 11.8 A. sauna polyp(-1) h(-1)). Maximum net capture rates were lower in flumes with A. sauna densities of <690 A. salina l(-1) than in flumes with higher food densities under comparable flow velocities. The maximum net capture rates observed represent maximum carbon capture rates of 66.4 +/- 2.0 mu g C polyp(-1) h(-1) and 17.9 +/- 10.7 mu g C polyp(-1) h(-1) under 2.5 and 5 cm(-1) s(-1) flow speeds respectively. The results of this study indicate that L pertusa captures zooplankton more efficiently under slower flow velocities. (C) 2010 Elsevier B.V. All rights reserved.

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