FN Archimer Export Format
PT J
TI Morphological Trends of Four Manila Clam Populations (Venerupis philippinarum) on the French Atlantic Coast: Identified Spatial Patterns and Their Relationship to Environmental Variability
BT 
AF CAILL-MILLY, Nathalie
   BRU, Noelle
   BARRANGER, Melanie
   GALLON, Laurent
   D'AMICO, Franck
AS 1:1;2:2;3:1;4:3;5:4;
FF 1:PDG-RBE-HGS-LRHAQ;2:;3:PDG-RBE-HGS-LRHAQ;4:;5:;
C1 IFREMER, Lab Ressources Halieut Aquitaine, FED MIRA 4155, F-64600 Anglet, France.
   Univ Pau & Pays Adour, Lab Math & Leurs Applicat Pau, UMR CNRS 5142, FED MIRA 4155, F-64000 Pau, France.
   Univ Pau & Pays Adour, Lab Informat, F-40004 Mt De Marsan, France.
   Univ Pau & Pays Adour, UMR ECOBIOP, FED MIRA 4155, F-64600 Anglet, France.
C2 IFREMER, FRANCE
   UNIV PAU & PAYS ADOUR, FRANCE
   UNIV PAU & PAYS ADOUR, FRANCE
   UNIV PAU & PAYS ADOUR, FRANCE
SI ANGLET
SE PDG-RBE-HGS-LRHAQ
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 0.791
TC 20
UR https://archimer.ifremer.fr/doc/00225/33605/32004.pdf
LA English
DT Article
CR EVALUATION STOCK PALOURDES BASSIN D'ARCACHON
DE ;shell shape;linear morphometric methods;contour detection;environmental effect;linear multilevel model;bivalve;Atlantic Ocean;Venerupis philippinarum
AB For species' dynamics highly influenced by environmental conditions, sustainable management for conservation and/or exploitation purposes requires the ability to segregate natural processes from anthropogenic impacts. In this context, identification of phenotypic variations in morphological patterns, and clarification of the mechanisms involved, constitute useful tools to identify adequate management measures from Europe-wide to local conditions. Although such approaches are already used effectively in the management of fish stocks, they are more recent for bivalve stocks, which are also good candidates for such management tools. The current study examines morphological patterns in the Manila clam (Venerupis philippinarum) through morphometric studies of 4 populations on the French Atlantic coast (Banc du Guer, Morbihan Gulf, Bellevue, and Arcachon Bay). The methodology relies mainly on conventional shape analysis using 8 morphometric ratios involving metrics and weight. In addition, an outline description was created for selected individuals that revealed different forms of the anterior-dorsal valve margin identified for future research. Using supervised classification methods, morphometric-latitudinal trends were revealed between northern and southern populations of V. philippinarum. Relationships between discriminatory morphometric ratios (describing elongation, valve density, and weight related to length) and available environmental conditions (temperature, salinity, and chlorophyll a concentrations) were considered using linear multilevel models. They revealed significant relationships with chlorophyll a concentrations and with 1 ratio with seawater temperature ranging from 12-20 degrees C. Four potential causes were hypothesized to explain the unexpected relationship identified between morphometric characteristics and trophic conditions: (1) a negative effect resulting from high chlorophyll a concentrations, (2) a masked effect of other food resources affecting valve growth, (3) interspecific competition for food among filter-feeding populations, (4) and effects of other environmental parameters such as sediment type. Observed differences in shape may result from a combination of these 4 causes with varying degrees, depending on site-specific environmental conditions. Last, the consequences of morphometric variation on population regulation are addressed.
PY 2014
PD SEP
SO Journal Of Shellfish Research
SN 0730-8000
PU Natl Shellfisheries Assoc
VL 33
IS 2
UT 000342693800004
BP 355
EP 372
DI 10.2983/035.033.0205
ID 33605
ER

EF