Recruitment To Sedentary Marine Populations as Exemplified By the Sand Crab, Emerita Analoga (Decapoda, Hippidae)

RECRUITMENT TO SEDENTARY MARINE POPULATIONS AS EXEMPLIFIED BY THE SAND CRAB, EMERITA ANALOGA (DECAPODA, HIPPIDAE) BY IAN E. EFFORD Department of Zoology, University of British Columbia, Vancouver 8, Canada, and Scripps Institution of Oceanography, University of California, La Jolla, U.S.A. The sand crab, Emerita analoga (Stimpson), resembles many littoral and benthic marine organisms in having the adult phase relatively sedentary and the larval phase planktonic. The advantages to organisms of having a dispersive planktonic larva in their life-history includes a wide distribution of the young to new habitats where, if suitable for the species, new populations are established or existing