Horizon 1 1 17 ACLN : Articles dans des revues avec comité de lecture non répertoriées par l'AERES Australian Journal of Marine and Freshwater Research 393-402 REPRODUCTION APPAREIL REPRODUCTEUR GAMETE ALLOMETRIE SEX RATIO MOLLUSQUE MARIN NOUVELLE CALEDONIE 1992 fdi:36696 ENG Australian Journal of Marine and Freshwater Research 10.1071/MF9920393 https://www.documentation.ird.fr/hor/fdi:36696 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_33-34/36696.pdf 43 Horizon (IRD) Monthly samples of the bivalves #Atactodea striata$, #Gafrarium tumidum$ and #Anadara scapha$ were collected over 1 year from the littoral zone on the South-Western coast of New Caledonia. #A. striata$ and #G. tumidum$ were studied by macroscopic examination of gonads and microscopic examination of gamete smears. For #A. scapha$, only microscopic examination was use. #A striata$ and #G. tumidum$ are dioecious, whereas #A. scapha$ is a protandric hermaphrodite. Sexual differentiation begins at a shell lenght of 20 mm for #A. striata$ and #G. tumidum$ aand 22 mm for #A. scapha$. The three species have an extended or continuous breeding period, although, in all three, sexual activity peaks in the hot season. (Résumé d'auteur) 036MILMAR01 ; 080ZOOGEN03