Shell Strength and Carapace Size in Non-Adult and Adult Male Snow Crab (Chionoecetes Opilio)

Dutil, Jean‐Denis; Rollet, Claire; Bouchard, Roxane; Claxton, W. Trevor

doi:10.1651/0278-0372(2000)020[0399:ssacsi]2.0.co;2

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…However, there may also be a methodological issue because radiometry will underestimate shell age when postmolt cuticle calcification is protracted (LeFoll et al 1989). The shell of male snow crabs continues to harden for at least 5-9 months after molting (Dutil et al 2000;Godbout et al 2002;Hébert et al 2002), and in our study maximum claw hardness was not reached until SC3 or 2-3 years after terminal molt age. In the warmwater mud crab Scylla serrata, the shell thickens and hardens continuously from postmolt (molt stage A) until the end of intermolt (molt stage C 3 ) through the addition of minerals (mostly calcium carbonate); mineralization occurs over the first 25 d of the 40-d-long molt cycle (Pratoomchat et al 2002).…”

Section: Longevity Of Adult Malescontrasting

confidence: 41%

“…We used linear regression or Spearman's rank correlation coefficient to explore the relationships of claw hardness or number of missing pereopods and CW at each SC stage for all adults. Both variables were expected to vary with CW, based on other studies (Dutil et al 2000; Sainte-Marie, unpublished data). Analysis of covariance (ANCOVA) was used to test for the homogeneity of slopes and elevations across SC stages for claw hardness.…”

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confidence: 75%

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Longevity and Change in Shell Condition of Adult Male Snow Crab Chionoecetes opilio Inferred from Dactyl Wear and Mark‐Recapture Data

Fonseca¹,

Sainte‐Marie²,

Hazel³

2008

Trans Am Fish Soc

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Postmolt longevity and changes in the shell condition and body integrity of male snow crab Chionoecetes opilio after their terminal molt were assessed through a mark-recapture experiment and population censuses in a commercially unfished locality of eastern Canada. The experiment explored the value of dactyl wear as a quantitative measure and shell condition (SC; measured on a five-stage scale) as a relative index of shell age. Males were recaptured up to 6 years after release. Much of the extensive variation in observed dactyl wear was explained by time at liberty (Dt) and male size, and the extent of change in SC was positively correlated with Dt. The conservative wear-based estimate of male longevity was 7.7 years, a value 1-3 years greater than previously estimated. Dactyl wear and recapture data confirmed that SC is a relative, albeit rough, index of shell age. Shell hardness was positively correlated with male size and peaked in stage 3 about 3.5 years after the terminal molt. The number of missing pereopods increased with shell age and SC stage and overall was negatively correlated with male size. The commercial value of adult males may be highest at 1-4.5 years post-terminal molt and the reproductive value at 2-5.5 years.

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Section: Longevity Of Adult Malescontrasting

confidence: 41%

mentioning

confidence: 75%

Longevity and Change in Shell Condition of Adult Male Snow Crab Chionoecetes opilio Inferred from Dactyl Wear and Mark‐Recapture Data

Fonseca¹,

Sainte‐Marie²,

Hazel³

2008

Trans Am Fish Soc

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“…e.g. Dutil et al, 2000;Evans & Sanson, 2005) although no studies of limnic invertebrates are known to us. In dragonfly larvae that, on the whole have a relatively thick cuticula (cf.…”

Section: Discussionmentioning

confidence: 99%

Predator‐induced spine length and exocuticle thickness in Leucorrhinia dubia (Insecta: Odonata): a simple physiological trade‐off?

Flenner

Olne

Suhling

et al. 2009

Ecological Entomology

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Abstract. 1. Morphological defence structures evolve against predators but are costly to the individual, and are induced only when required. A well‐studied example is the development of longer abdominal spines in dragonfly larvae in the presence of fish. Numerous attempts to discover trade‐offs between spine size and behaviour, development time or body size have, however, produced little evidence. 2. We considered a physiological trade‐off. Spines consist of cuticle and using material to build longer structures may result in less material remaining elsewhere. We therefore measured exocuticle thickness at nine locations on Leucorrhinia dubia larvae from habitats with and without fish. 3. Our results show a significant effect of the interaction between fish presence and spine length on head and fore leg exocuticle thickness. Relative thickness increased with relative length of lateral spine 9 in the absence of fish, whereas no such relationship existed with fish. Hence, synthesis and secretion of cuticle material occur as a trade‐off when larvae react to fish presence. 4. We assume the mechanism to be a selective synthesis of material with different responses in different parts of the larval body. These findings offer a new angle to the fish/spine trade off debate.

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Diet and some ecological features of the most widespread commercial crab species in the northwestern Sea of Japan in early spring

Chuchukalo¹,

Nadtochy²,

Koblikov³

et al. 2011

Russ J Mar Biol

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Results of the study of feeding habits of the commercial crab species Chionoecetes opilio, Ch. japonicus, Paralithodes platypus, P. camtschaticus, and Erimacrus isenbeckii in early spring 2009 are pre sented. The composition, distribution, and quantitative characteristics of benthos in the areas of sampling are analyzed. The generalized pattern of distribution of the considered crabs is shown with the maximum and mean densities. These crabs were found to consume at least three to four single portions of food during 10-12 hours of daylight. The lowest feeding intensity was observed in the opilio snow crab in March and April. Cannibalism proved to be typical for all the studied crab species in the spring. It was most developed in the deepwater red snow crab, in whose diet representatives of the same species constituted a one third share. It was also noted that the diet of the studied crabs included a major proportion of crabs and shrimps, which was unusual for the feeding habits of the same species in other Far Eastern seas.

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Shell Strength and Carapace Size in Non-Adult and Adult Male Snow Crab (Chionoecetes Opilio)

Cited by 6 publications

References 23 publications

Longevity and Change in Shell Condition of Adult Male Snow Crab Chionoecetes opilio Inferred from Dactyl Wear and Mark‐Recapture Data

Longevity and Change in Shell Condition of Adult Male Snow Crab Chionoecetes opilio Inferred from Dactyl Wear and Mark‐Recapture Data

Predator‐induced spine length and exocuticle thickness in Leucorrhinia dubia (Insecta: Odonata): a simple physiological trade‐off?

Diet and some ecological features of the most widespread commercial crab species in the northwestern Sea of Japan in early spring

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