Sampling epifauna, a necessity for a better ...
Document type :
Article dans une revue scientifique: Article original
Title :
Sampling epifauna, a necessity for a better assessment of benthic ecosystem functioning: An example of the epibenthic aggregated species Ophiothrix fragilis from the Bay of Seine
Author(s) :
Lozach, S. [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Morphodynamique Continentale et Côtière [M2C]
Dauvin, Jean-Claude [Auteur]
Morphodynamique Continentale et Côtière [M2C]
Méar, Y. [Auteur]
Institut national des sciences et techniques de la mer [INTECHMER]
Murat, A. [Auteur]
Institut national des sciences et techniques de la mer [INTECHMER]
Davoult, Dominique [Auteur]
Adaptation et diversité en milieu marin [AD2M]
Migné, A. [Auteur]
Adaptation et diversité en milieu marin [AD2M]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Morphodynamique Continentale et Côtière [M2C]
Dauvin, Jean-Claude [Auteur]
Morphodynamique Continentale et Côtière [M2C]
Méar, Y. [Auteur]
Institut national des sciences et techniques de la mer [INTECHMER]
Murat, A. [Auteur]
Institut national des sciences et techniques de la mer [INTECHMER]
Davoult, Dominique [Auteur]
Adaptation et diversité en milieu marin [AD2M]
Migné, A. [Auteur]
Adaptation et diversité en milieu marin [AD2M]
Journal title :
Marine Pollution Bulletin
Pages :
2753-2760
Publisher :
Elsevier
Publication date :
2011-02-16
ISSN :
0025-326X
English keyword(s) :
Ophiothrix fragilis Epifauna Benthic sampling English Channel Grabs Video
HAL domain(s) :
Planète et Univers [physics]/Interfaces continentales, environnement
Sciences de l'environnement/Milieux et Changements globaux
Sciences de l'environnement/Milieux et Changements globaux
English abstract : [en]
Sampling the sea bottom surface remains difficult because of the surface hydraulic shock due to water flowing through the gear (i.e., the bow wave effect) and the loss of epifauna organisms due to the gear's closing mechanism. ...
Show more >Sampling the sea bottom surface remains difficult because of the surface hydraulic shock due to water flowing through the gear (i.e., the bow wave effect) and the loss of epifauna organisms due to the gear's closing mechanism. Slow-moving mobile epifauna, such as the ophiuroid Ophiothrix fragilis, form highdensity patches in the English Channel, not only on pebbles like in the Dover Strait or offshore Brittany but also on gravel in the Bay of Seine (>5000 ind m 2 ). Such populations form high biomasses and control the water transfer from the water column to the sediment. Estimating their real density and biomass is essential for the assessment of benthic ecosystem functioning using trophic web modelling. In this paper, we present and discuss the patch patterns and sampling efficiency of the different methods for collecting in the dense beds of O. fragilis in the Bay of Seine. The large Hamon grab (0.25 m 2 ) highly under-estimated the ophiuroid density, while the Smith McIntyre appeared adequate among the tested sampling grabs. Nowadays, diving sampling, underwater photography and videos with remote operated vehicle appear to be the recommended alternatives to estimate the real density of such dense slow-moving mobile epifauna.Show less >
Show more >Sampling the sea bottom surface remains difficult because of the surface hydraulic shock due to water flowing through the gear (i.e., the bow wave effect) and the loss of epifauna organisms due to the gear's closing mechanism. Slow-moving mobile epifauna, such as the ophiuroid Ophiothrix fragilis, form highdensity patches in the English Channel, not only on pebbles like in the Dover Strait or offshore Brittany but also on gravel in the Bay of Seine (>5000 ind m 2 ). Such populations form high biomasses and control the water transfer from the water column to the sediment. Estimating their real density and biomass is essential for the assessment of benthic ecosystem functioning using trophic web modelling. In this paper, we present and discuss the patch patterns and sampling efficiency of the different methods for collecting in the dense beds of O. fragilis in the Bay of Seine. The large Hamon grab (0.25 m 2 ) highly under-estimated the ophiuroid density, while the Smith McIntyre appeared adequate among the tested sampling grabs. Nowadays, diving sampling, underwater photography and videos with remote operated vehicle appear to be the recommended alternatives to estimate the real density of such dense slow-moving mobile epifauna.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Source :
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