FN Archimer Export Format PT J TI The conservation status of Sabellaria alveolata (L.) (Polychaeta: Sabellariidae) reefs in the Bay of Mont-Saint-Michel BT AF DESROY, Nicolas DUBOIS, Stanislas FOURNIER, Jerome RICQUIERS, L. LE MAO, Patrick GUERIN, Laurent GERLA, Daniel ROUGERIE, Michel LEGENDRE, Aurelie AS 1:1;2:2;3:3,4;4:5;5:1;6:5;7:1;8:1;9:1; FF 1:PDG-ODE-LER-LERFBN;2:PDG-ODE-DYNECO-BENTHOS;3:;4:;5:PDG-ODE-LER-LERFBN;6:;7:PDG-ODE-LER-LERFBN;8:PDG-DOP-LER-LERFBN;9:PDG-ODE-LER-LERFBN; C1 IFREMER, CRESCO, Lab Environm & Ressources Finistere Bretagne Nord, F-35801 Dinard, France IFREMER, DYNECO Lab Ecol Benth, F-29280 Plouzane, France CNRS, Museum Natl Hist Nat, UMR BOREA 7208, F-75231 Paris 05, France CNRS, UMR 6042 GEOLAB, Clermont‐Université, 4 Rue Ledru, 63057 Clermont‐Ferrand cedex, France Muséum National d’Histoire Naturelle, CRESCO, 38 Rue du Port Blanc, BP 80108, 35801 Dinard, France C2 IFREMER, FRANCE IFREMER, FRANCE CNRS, FRANCE CNRS, FRANCE MNHN, FRANCE SI DINARD BREST SAINT MALO SE PDG-ODE-LER-LERFBN PDG-ODE-DYNECO-BENTHOS MNHN PDG-DOP-LER-LERFBN IN WOS Ifremer jusqu'en 2018 copubli-france IF 1.929 TC 44 UR https://archimer.ifremer.fr/doc/00043/15430/12887.pdf LA English DT Article DE ;Sabellaria alveolata;biogenic reef;health status;biological indicator;shellfish farming;recreational fishing activities AB 1. Reefs built by the annelid worm Sabellaria alveolata in the Bay of Mont-Saint-Michel (France) are the most extensive intertidal biogenic structures within Europe. Before and after mussel farming extensions, a study designed to provide a biological health index of the Sainte-Anne reef (223 ha) was carried in 2001 and 2007 to serve as an easy-to-use management tool and to ensure endangered reef portions were properly targeted and protected. 2. Coupled physical and biological parameters were included in a spatial Health Status Index (HI). A spatial and temporal mapping survey of the HI showed a continuous deterioration of the reef's state of health, particularly in its central part. This degradation correlates with the colonization of the Pacific oyster Crassostrea gigas and with increasing silt deposits on the reef. 3. A combination of several factors is likely to explain such rapid reef deterioration: (1) an increase in trophic competition between cultivated and wild suspension-feeders that is detrimental to the annelids; (2) a modification in the hydrodynamics and consequently in sedimentary patterns leading to an increase in silt deposition; and most importantly (3) an increase in recreational harvesting of oysters and associated reef trampling, resulting in reef fragmentation. 4. Understanding the parameters that influence the reef dynamics is necessary in order to help efficient and effective management and policy focusing on the conservation status of large biogenic structures. Copyright (C) 2011 John Wiley & Sons, Ltd. PY 2011 PD JUN SO Aquatic Conservation-marine And Freshwater Ecosystems SN 1052-7613 PU Wiley-blackwell VL 21 IS 5 UT 000294180600007 BP 462 EP 471 DI 10.1002/aqc.1206 ID 15430 ER EF