Reproductive cycles of the bivalve molluscs #Atactodea striata$ (Gmelin), #Gafrarium tumidum$ Röding and #Anadara scapha$ (L.) in New Caledonia

Reproductive cycles of the bivalve molluscs #Atactodea striata$ (Gmelin), #Gafrarium tumidum$ Röding and #Anadara scapha$ (L.) in New Caledonia Baron Jérôme auteur aut IRD text journalArticle eng text/pdf reformatted digital access 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) specialized REPRODUCTION APPAREIL REPRODUCTEUR GAMETE ALLOMETRIE SEX RATIO MOLLUSQUE MARIN NOUVELLE CALEDONIE 036MILMAR01 080ZOOGEN03 Australian Journal of Marine and Freshwater Research 43 393-402 1992 https://www.documentation.ird.fr/hor/fdi:36696 10.1071/MF9920393 [F B36696] 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 IRD - Base Horizon / Pleins textes 1993-02-01 2013-12-20 fdi:36696 fre