REBENT 11
Type | Oceanographic cruise |
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Set | This cruise is part of the set REBENT |
Ship | Thalia |
Ship owner | Ifremer |
Dates | 30/05/2006 - 11/06/2006 |
Chief scientist(s) | HAMON Dominique, BLANCHET-AURIGNY Aline |
DYNECO-LEBCO LABORATOIRE D'ÉCOLOGIE BENTHIQUE CÔTIÈRE IFREMER Centre de Bretagne ZI Pointe du diable CS 10070 29280 PLOUZANE +33 (0)2 98 22 49 19 https://dyneco.ifremer.fr/Qui-sommes-nous/Ecologie-benthique-cotiere-LEBCO |
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DOI | 10.17600/6070120 |
Objective | The coastal benthic biocenoses monitoring network's strategy, defined in the REBENT (Benthic Network) program, planned to set up long-term biodiversity monitoring of habitats in benchmark sectors distributed along the coast line. Pursuing actions undertaken since 2003 to identify and characterize benthic habitats in these reference sectors, the REBENT 11 cruise dealt with two sites, with the following aims: 1) In the Trégor-Goëlo sector (30 May to 2 June), biological characterization of subtidal soft sediment benthic habitats, after preliminary mapping of them using sidescan sonar in the framework of the REBENT10 cruise. A stratified biological sampling approach (based on acoustic facies) for the macrofauna was undertaken using a Hamon grab and subsea video sequences also provided information about both megafauna and the morphosedimentary nature of the seabed. Sediment samples were also taken with a Shipek grab in the Trieux channel in order to complement those already done during REBENT10 and validate the acoustic image acquisition. 2) In the Concarneau sector (7 to 11 June), using sidescan sonar in specifying the outer boundaries of seafloors covered with Haploops (tube-building amphipods) which had been previously mapped. This population had already been identified in the bay of Concarneau and in the Glénan archipelago, so it was interesting to see whether there was continuity of this habitat between the two sectors. Along with the additional sonar logs, there were sedimentary samples taken with the Shipek grab (to validate acoustic data), Hamon grab samples, sedimentary core samples and video observation of Haploops bottoms using video. |