FN Archimer Export Format
PT J
TI How does the connectivity between populations mediate range limits of marine invertebrates? A case study of larval dispersal between the Bay of Biscay and the English Channel (North-East Atlantic)
BT 
AF AYATA, Sakina-Dorothee
   LAZURE, Pascal
   THIEBAUT, Eric
AS 1:1,2;2:3;3:1,2;
FF 1:;2:PDG-DOP-DCB-DYNECO-PHYSED;3:;
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.
   IFREMER, Dept Dynam Environm Cotier, F-29280 Plouzane, France.
C2 UNIV PARIS 06, FRANCE
   CNRS, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-DOP-DCB-DYNECO-PHYSED
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 3.269
TC 69
UR https://archimer.ifremer.fr/doc/00030/14174/11464.pdf
   https://archimer.ifremer.fr/doc/00030/14174/11506.pdf
LA English
DT Article
CR LARVASUD
BO Côtes De La Manche
AB For many marine species, larval dispersal plays a crucial role in population persistence, re-colonization of disturbed areas, and distribution of species range limits through the control of population connectivity. Along the French Atlantic coast (NE Atlantic), a biogeographical transition zone has been reported between temperate and cold-temperate marine faunal assemblages. Hydrodynamics in this area are highly complex and variable including numerous mesoscale features (e.g. river plumes, fronts, upwellings, low salinity lenses), which could constrain larval transport and connectivity. In this context, the aim of this study was to assess how hydrodynamic conditions and biological traits influence larval transport and contribute to population connectivity along the biogeographical transition zone between the Bay of Biscay and the English Channel. A coupled bio-physical individual-based model was used at a regional scale to track larval trajectories under realistic hydroclimatic conditions (tides, river run-offs, and meteorological conditions) and for some common life-history traits. Larval particles were released monthly from February to August for the years 2001 to 2005, from 16 spawning populations corresponding to the main bays and estuaries of the study area. Two planktonic larval durations (2 vs. 4 weeks) and three vertical distributions (no swimming behaviour, diel vertical migration, and ontogenic vertical migration) were considered. Dispersal kernels were described by 17 parameters and analysed in a multivariate approach to calculate connectivity matrices and indices. The main factors responsible for the variability of the dispersal kernels were the spawning month in relation to the seasonal variations in river run-offs and wind conditions, the planktonic larval duration, the spawning population location, and the larval behaviour. No significant inter-annual variability was observed. Self-retention rates were high and larval exchanges occurred mainly within the main hydrodynamical areas: the western English Channel, the Southern Brittany, and the Central Bay of Biscay. Connectivity between the English Channel and the Bay of Biscay populations was low and occurred only under particular hydroclimatic conditions (i.e. high river run-off and strong SW winds) and for some biological traits (i.e. long planktonic larval duration). (C) 2010 Elsevier Ltd. All rights reserved.
PY 2010
PD OCT
SO Progress In Oceanography
SN 0079-6611
PU Pergamon-elsevier Science Ltd
VL 87
IS 1-4
UT 000286298700003
BP 18
EP 36
DI 10.1016/j.pocean.2010.09.022
ID 14174
ER

EF