FN Archimer Export Format PT C TI Mesure de la retention de Skeletonema costatum par Ruditapes philippinarum (Mollusque, Bivalve) en fonction de la longueur des colonies algales: Principes methodologiques OT Determination of retention efficiency of Skeletonema costatum by Ruditapes philippnarum (Mollusca, Bivalvia) related to the size of the diatom algae: Methodological aspects. BT AF SAURIAU, Pierre-Guy BAUD, Jean-Pierre AS 1:;2:; FF 1:;2:PDG-DPCP; SI L NANTES SE PDG-DPCP UR https://archimer.ifremer.fr/doc/1991/acte-1670.pdf LA French DT Proceedings paper DE ;Bivalvia;Skeletonema costatum;Bacillariophyceae;Algae;Physiology;Biopolymorphism;Counters;Size;Size distribution;Feeding;Nutrition AB Based on Coulter Counter data, a new method is proposed to study the influence of the polymorphous variability in size as well as in shape of the diatom species Skeletonema costatum on the physiological performances of the Manila clam Ruditapes philippinarum . Three conditions are required in order to convert volumetric data determined with the Coulter Counter into metric data, i.e. (1) stability of the pervalvar diameter of the diatom chains, (2) statistical independence between length and pervalvar diameter of the diatom chains, and (3) negligible level of coincident passages through the aperture orifice. Under these three conditions, the mean length (l) of a S. costatum chain can be related to the mean pervalvar diameter (d) of diatom chains and to the spherical diameter (D) of each channel of the Coulter Counter. The mean length (l) of a S. costatum chain is then estimated by l = 4 D super(3)/6 d super(2). Application of this analytic method is discussed. PY 1991 PD NOV CT Actes de colloques. Ifremer. Brest [ACTES COLLOQ. IFREMER.]. 1991 ID 1670 ER EF