STUDIES ON THE TALITRIDAE (AMPHIPODA, CRUSTACEA) IN JAPAN -III. LIFE HISTORY AND BREEDING ACTIVITY OF ORCHESTIA PLATENSIS KRφYER-

Abstract

Life histories and breeding activities of the gammaridean Amphipoda have been elucidated in many species from various view points. Many studies are directed to contribute to the biology of a species (Watkin, 1941 ; Amanieu, 1969; Steele and Steele, 1969--1975c; Dexter, 1971; etc.) and some have been done to afford the basis for production study of a species (Cooper, 1965; Klein, 1975) and still some are with the intention to give ecological consideration of niche or population in several species (Hynes, 1954; Croker, 1967; Sameoto, 1969a,b). Only a few, however, treated the life history in its morphological aspect. The present study deals with the results of investigation into the life history and breeding activity of Orchestia platensis in view to afford the basis for morphological discussion in the succeeding paper.