FN Archimer Export Format
PT J
TI Modelling larval dispersal and settlement of the reef-building polychaete Sabellaria alveolata: Role of hydroclimatic processes on the sustainability of biogenic reefs
BT 
AF AYATA, Sakina-Dorothee
   ELLIEN, Celine
   DUMAS, Franck
   DUBOIS, Stanislas
   THIEBAUT, Eric
AS 1:1,2;2:3;3:4;4:4;5:1,2;
FF 1:;2:;3:PDG-DOP-DCB-DYNECO-PHYSED;4:PDG-DOP-DCB-DYNECO-BENTHOS;5:;
C1 Univ Paris 06, Stn Biol Roscoff, Lab Adaptat & Diversite Milieu Marin, F-29682 Roscoff, France.
   CNRS, UMR 7144, Lab Adaptat & Diversite Milieu Marin, F-29682 Roscoff, France.
   Museum Natl Hist Nat, Dept Milieux & Peuplements Aquat, UMR 5178, F-75231 Paris, France.
   IFREMER, Dept Dynam Environm Cotier, F-29280 Plouzane, France.
C2 UNIV PARIS 06, FRANCE
   CNRS, FRANCE
   MNHN, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-DOP-DCB-DYNECO-PHYSED
   PDG-DOP-DCB-DYNECO-BENTHOS
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 2.183
TC 51
UR https://archimer.ifremer.fr/doc/2009/publication-6841.pdf
LA English
DT Article
DE ;Bay of Mont Saint Michel;English Channel;Modelling;Larval settlement;Larval transport;Connectivity;Biogenic reefs;Sabellaria alveolata
AB The honeycomb worm Sabellaria alveolata forms biogenic reefs which constitute diversity hotspots on tidal flats. The largest known reefs in Europe, located in the Bay of Mont-Saint-Michel (English Channel), are suffering increasing anthropogenic disturbances which raise the question of their sustainability. As the ability to recover depends partly on the recolonization of damaged reefs by larval supply, evaluating larval dispersal and the connectivity between distant reefs is a major challenge for their conservation. In the present study, we used a 3D biophysical model to simulate larval dispersal under realistic hydroclimatic conditions and estimate larval retention and exchanges among the two reefs of different sizes within the bay. The model takes into account fine-scale hydrodynamic circulation (800 x 800 m(2)), advection-diffusion larval transport, and gregarious settlement behaviour. According to the field data, larval dispersal was simulated for a minimal planktonic larval duration ranging from 4 to 8 weeks and the larval mortality was set to 0.09 d(-1). The results highlighted the role played by a coastal eddy on larval retention within the bay, as suggested by previous in situ observations. Very different dispersal patterns were revealed depending on the spawning reef location, although the two reefs were located only 15 km apart. The settlement success of the larvae released from the smallest reef was mainly related to tidal conditions at spawning, with the highest settlement success for releases at neap tide. The settlement success of the larvae from the biggest reef was more dependent on meteorological conditions: favourable Wand SW winds may promote a ten-fold increase in settlement success. Strong year-to-year variability was observed in settlers' numbers, with favourable environmental windows not always coinciding with the main reproductive periods of Sabellaria. Settlement kinetics indicated that the ability to delay metamorphosis could significantly improve the settlement success. Although bidirectional exchanges occurred between the two reefs, the highest settlers' numbers originated from the biggest reef because of its stronger reproductive output. Because of the recent decline of this reef due to increasing anthropogenic disturbances larval supply in the bay may not be sufficient enough to ensure the sustainability of the remarkable habitat formed by Sabellaria alveolata reefs. (c) 2009 Elsevier Ltd. All rights reserved.
PY 2009
PD JUL
SO Continental Shelf Research
SN 0278-4343
PU Elsevier
VL 29
IS 13
UT 000268434300006
BP 1605
EP 1623
DI 10.1016/j.csr.2009.05.002
ID 6841
ER

EF