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Activity Patterns and Retinal Pigment Migration in Pagurus (Decapoda, Paguridea)

Activity Patterns and Retinal Pigment Migration in Pagurus (Decapoda, Paguridea) 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 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Crustaceana Brill

Activity Patterns and Retinal Pigment Migration in Pagurus (Decapoda, Paguridea)

Crustaceana , Volume 14 (3): 302 – Jan 1, 1968

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References (1)

Publisher
Brill
Copyright
© 1968 Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0011-216x
eISSN
1568-5403
DOI
10.1163/156854068X00872
Publisher site
See Article on Publisher Site

Abstract

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

Journal

CrustaceanaBrill

Published: Jan 1, 1968

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