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G. Bruin, D. Crisp (1957)
The Influence of Pigment Migration on Vision of Higher CrustaceaThe Journal of Experimental Biology, 34
ACTIVITY PATTERNS AND RETINAL PIGMENT MIGRATION IN PAGURUS (DECAPODA, PAGURIDEA) BY ELDON E. BALL, Jr. Hopkins Marine Station of Stanford University, Pacific Grove, California, U.S.A. 1) INTRODUCTION Pagurus .ramueli.r (Stimpson) and Pagurus granosimanus (Stimpson) are very abundant in the rocky intertidal region in the vicinity of the Hopkins Marine Station of Stanford University, Pacific Grove, California. At times the hermit crabs are dispersed with many individuals active, while at other times they are highly clustered in sheltered areas. The following studies were carried out to determine the relation of dispersion pattern to light, and to relate behavioral responses of the whole animal to the behavior of the retinal pigments of the eye. DIURNAL DISPERSION PATTERNS Ideally the following experiments should have been carried out under normal field conditions, but this was not practical due to the difficulty of night obser- vation. Preliminary investigations indicated that both tides and turbulence affected crab dispersion, but these factors were not considered in the present study. All Pagurus used were collected on Point Pinos near Pacific Grove, California. In order to keep the two species of Pagurus separate an outdoor, concrete pond was divided in half by a screen to give 2
Crustaceana – Brill
Published: Jan 1, 1968
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