MALE DISCRIMINATION AND INVESTMENT IN ASELLUS AQUATICUS (L.) AND A. MERIDIANUS RACOVITSZA (CRUSTACEA : ISOPODA) by J. T. MANNING1)2) (Department of Zoology, University of Liverpool, England) (With 6 Figures) (Rec. 10-VIII-1974) INTRODUCTION There are two species of fresh water Isopod recognised from the surface waters of the British Isles, Asellus aquaticus (L.) and A. meridianus Raco- vitza. Both species during their breeding season exhibit a precopulatory pas- sive phase. A passive phase has been defined by PARKER (r97o) as "a stage of the male's reproductive behaviour during which he remains mounted on or otherwise attached to the female but without true genital contact." This behaviour pattern occurs in a number of diverse groups of organisms e.g. Amphipods, Isopods, Sepsidae, Locusta and Anurans (PARKER, ig7o). In A. aquaticus and A. meridianus the phase involves the placing of the female, dorsal side uppermost, between the male's leg. The female is held firmly in position by the male's fourth pair of paraeopods. During this association the larger male is able to move freely and both individuals can apparently feed normally. Some information on the duration of the passive phase is available from previous workers. MAERCKS (1930) and KAULBERz (1913) found in
Behaviour – Brill
Published: Jan 1, 1975
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