FN Archimer Export Format
PT J
TI Density-dependent growth of bivalves dominating the intertidal zone of Banc d'Arguin, Mauritania: importance of feeding mode, habitat and season
BT 
AF VAN DER GEEST, Matthijs
   VAN DER LELY, Jorge A. C.
   VAN GILS, Jan A.
   PIERSMA, Theunis
   LOK, Tamar
AS 1:1,2,3;2:1,2;3:1,2;4:1,2,4;5:1,2;
FF 1:;2:;3:;4:;5:;
C1 NIOZ Royal Netherlands Inst Sea Res, Dept Coastal Syst, POB 59, NL-1790 AB Den Burg, Texel, Netherlands.
   Univ Utrecht, POB 59, NL-1790 AB Den Burg, Texel, Netherlands.
   Univ Montpellier, MARBEC Ctr Marine Biodivers Exploitat & Conservat, UMR 9190, IRD IFREMER CNRS UM, F-34095 Montpellier 5, France.
   Univ Groningen, Conservat Ecol Grp, Groningen Inst Evolutionary Life Sci GELIFES, POB 11103, NL-9700 CC Groningen, Netherlands.
C2 INST SEA RESEARCH (NIOZ), NETHERLANDS
   UNIV UTRECHT, NETHERLANDS
   UNIV MONTPELLIER, FRANCE
   UNIV GRONINGEN, NETHERLANDS
UM MARBEC
IN WOS Cotutelle UMR
   copubli-europe
IF 2.326
TC 6
UR https://archimer.ifremer.fr/doc/00492/60319/63744.pdf
   https://archimer.ifremer.fr/doc/00492/60319/63745.pdf
   https://archimer.ifremer.fr/doc/00492/60319/63983.pdf
LA English
DT Article
DE ;Carrying capacity;Chemosymbiosis;Density dependence;Environmental heterogeneity;Feeding guild;Seagrass;Soft-sediment habitat
AB Accurate predictions of population dynamics require an understanding of the ways by which environmental conditions and species-specific traits affect the magnitude of density dependence. Here, we evaluated the potential impact of season and habitat (characterized by sediment grain size and seagrass biomass) on the magnitude of density dependence in shell growth of 3 infaunal bivalve species dominating the tropical intertidal benthic communities of Banc d'Arguin, Mauritania. Two of our focal species were filter feeders (Senilia senilis and Pelecyora isocardia) and one was a facultative mixotroph (Loripes orbiculatus), mainly relying on organic carbon provided by sulphide-oxidizing endosymbiotic gill-bacteria (i.e. chemosymbiotic). Distinguishing 2 seasons, winter and summer, we manipulated local bivalve densities across habitats (from bare sandy sediments to seagrass-covered mud). In situ growth of individually tagged and relocated clams was measured and compared with those of tagged clams that were allocated to adjacent sites where local bivalve densities were doubled. Growth was negatively density-dependent in both winter and summer in P. isocardia and L. orbiculatus, the 2 species that mainly inhabit seagrass sediments, but not in S. senilis, usually found in bare sediments. As reproduction and survival rates are generally size-dependent in bivalves, our results suggest that in our tropical study system, the bivalve community of seagrass-covered sediments is more strongly regulated than that of adjacent bare sediments, regardless of species-specific feeding mode or season. We suggest that ecosystem engineering by seagrasses enhances environmental stability, which allows bivalve populations within tropical seagrass beds to stay close to carrying capacity. 
PY 2019
PD FEB
SO Marine Ecology Progress Series
SN 0171-8630
PU Inter-research
VL 610
UT 000464515700004
BP 51
EP 63
DI 10.3354/meps12851
ID 60319
ER

EF