Gastric processing and evacuation during emersion in the red rock crab,Cancer productus

2007 ◽  
Vol 40 (2) ◽  
pp. 117-131 ◽  
Author(s):  
Iain J. Mcgaw
Keyword(s):  
Cancer Productus ◽  
Rock Crab

scholarly journals Horizontal distributions of Dungeness crab (Cancer magister) and red rock crab (Cancer productus) larvae in the Strait of Georgia, British Columbia

2014 ◽  
Vol 71 (9) ◽  
pp. 2564-2577 ◽  
Author(s):  
Kevin A. Sorochan ◽  
Pedro A. Quijón
Keyword(s):  
Horizontal Distribution ◽  
Spatial And Temporal Variability ◽  
Dungeness Crab ◽  
Physical Processes ◽  
Cancer Magister ◽  
Strait Of Georgia ◽  
Water Properties ◽  
Larval Stages ◽  
Cancer Productus ◽  
Rock Crab

Abstract The supply of planktonic larvae to adult populations is an important contributor to the spatial and temporal variability of benthic marine organisms. The ability to predict spatial patterns of larvae and recruits from the physical and biological processes that facilitate dispersal is required in order to advise and evaluate conservation and fisheries management decisions. In the present study, the horizontal distribution of Dungeness crab (Cancer magister) and red rock crab (Cancer productus) zoeae was described from surveys conducted in the Strait of Georgia in the spring of 2009 and 2010. Processes that may be responsible for generating spatial variability of larvae were evaluated based on (i) horizontal overlap between larvae and water properties, (ii) spatial dependence of larvae and water properties, and (iii) changes in the dispersion of stage-specific distributions. Interspecific variability between horizontal patterns of the first and second larval stages was primarily attributed to differences in the distribution of larval release locations, which appeared to be restricted to the southern and central strait for C. magister. Potential effects of physical processes on larval distributions are also discussed.

Juvenile colour polymorphism in the red rock crab, Cancer productus: patterns, causes, and possible adaptive significance

Zoology ◽  
2010 ◽  
Vol 113 (3) ◽  
pp. 131-139 ◽  
Author(s):  
Jacqueline Krause-Nehring ◽  
J. Matthias Starck ◽  
A. Richard Palmer
Keyword(s):  
Adaptive Significance ◽  
Colour Polymorphism ◽  
Cancer Productus ◽  
Rock Crab

scholarly journals ANALYSIS OF HEMOLYMPH OXYGEN LEVELS AND ACID-BASE STATUS DURING EMERSION 'IN SITU' IN THE RED ROCK CRAB, CANCER PRODUCTUS

1983 ◽  
Vol 165 (3) ◽  
pp. 582-590 ◽  
Author(s):  
PETER L. DEFUR ◽  
BRIAN R. MCMAHON ◽  
CHARLES E. BOOTH
Keyword(s):  
Acid Base ◽  
Oxygen Levels ◽  
Cancer Productus ◽  
Rock Crab ◽  
Acid Base Status

scholarly journals A multivariate study of variation in two species of rock crab of the genus Leptograpsus

1974 ◽  
Vol 22 (3) ◽  
pp. 417 ◽  
Author(s):  
NA Campbell ◽  
RJ Mahon
Keyword(s):  
Carapace Length ◽  
Carapace Width ◽  
The Body ◽  
Canonical Variate ◽  
Multivariate Approach ◽  
Maximum Width ◽  
Multivariate Study ◽  
Rock Crab ◽  
Males And Females ◽  
Colour Form

A multivariate approach has been used to study morphological variation in the blue and orange-form species of rock crab of the genus Leptograpsus. Objective criteria for the identification of the two species are established, based on the following characters: width of the frontal region of the carapace; width of the posterior region of the carapace (rear width); length of the carapace along the midline; maximum width of the carapace; and the depth of the body. The first canonical variate, which differentiates between the two species, represents a contrast between the carapace width relative to the width of the front lip and the depth of the body; the blue-form species has a greater relative carapace width than has the orange form. The second canonical variate, which presents a contrast between the rear width and the carapace length, identifies males and females within each species; males have a greater relative carapace length than have females. All individuals, including 20 not used in the study, were correctly identified for colour form. The clear separation of the blue and orange forms achieved by canonical analysis supports the previously determined specific status of the two forms.

Mating Behavior of the Rock Crab, Cancer irroratus

1978 ◽  
Vol 35 (10) ◽  
pp. 1385-1388 ◽  
Author(s):  
R. W. Elner ◽  
A. B. Stasko
Keyword(s):  
Key Words ◽  
Mating Behavior ◽  
Cancer Irroratus ◽  
Rock Crab ◽  
Laboratory Tank

A pair of rock crabs, Cancer irroratus, in mating embrace an hour after being placed in a laboratory tank, was observed intermittently until ecdysis of the female and copulation of the pair, and then until escape of the female 27 d after ecdysis. When separated from the mating embrace, the hard-shelled female sought out the male. Approach of female ecdysis was indicated by protrusion of a soft spherical bulge at the rear of the epimeral line. Details of the immediate pre- and postcopulatory behavior were observed continuously from 26 min before to 150 min after copulation. The female was first noted separated from the male 7 h after copulation. Periods of separation increased until mating interactions were completely abandoned 5 d after copulation. A second pair subsequently observed confirmed the above. Mating embrace was also observed between a hard-shelled male and a hard-shelled female that already had sperm plugs. Key words: Crustacea, crabs, copulation, molt indicators

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