Effect of the brittle star Amphiura filiformis (Amphiuridae, Echinodermata) on oxygen flux into the sediment

Vopel, K
Thistle, D
Rosenberg, R
Item type
Journal Article
Degree name
Journal Title
Journal ISSN
Volume Title
American Society of Limnology and Oceanography (ASLO) - Blue Policies in RoMEO

O-2 plays a key role in early sedimentary diagenetic processes, but the effect of most macrofaunal species on the pathways and rates of supply of O-2 into the seabed are not well known. We investigated the effect of the ophiuroid Amphiura filiformis, one of the dominant macrobenthic species on soft bottoms in the northeast Atlantic, at depths of similar to15-100 m, in a laboratory environment. We determined how the presence of the ophiuroid changed the total O-2 uptake of macrofauna-free sediment by combining measurements from a microcosm approach and an approach that uses microelectrodes and a flushed aquarium. We suggest that natural populations of A. filiformis can account for 80% of the total flux of O-2 into the soft bottom. At least 67% of this portion is due to the diffusion of O-2 across additional sediment-water interfaces excavated by the brittle star.

Diffusive boundary layers , Stirred benthic chambers , Deep sea sediments , Marine-sediments , In-situ , Callianassa-subterranea , North sea , Ophiuroidea , Dynamics , Water
Limnology and Oceanography, vol.48(5), pp.2034-2045
Rights statement
©, 2003 by the American Society of Limnology and Oceanography, Inc. All Rights Reserved. (please see Citation and Publisher’s Version). Permission to make digital or hard copies of part or all of Limnology and Oceanography for personal or educational use is hereby granted without fee.