Zuwai crab population

Kon, Tohshi; Sinoda, Masatoshi

doi:10.1080/10236249209378826

Cited by 8 publications

(5 citation statements)

References 23 publications

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“…Life history schedule of immature female snow crab in the eastern Bering Sea Shelf There is an interval of approximately 2 years in the early life history of snow crab from the EBS, for which there is little information available. That interval includes (1) hatching, which occurs during the spring, before summer surveys are conducted (Somerton 1981(Somerton , 1983Incze et al 1987) ; (2) pelagic stages, lasting 3-5 months, which are not routinely monitored (Incze et al 1987;Kon and Sinoda 1992) ; (3) settlement and megalopae molting into instar i (mean CW ∼3 mm), which presumably occur in late summer to early fall, after the surveys are completed (Incze et al 1987;this study); and (4) instars ii-iii (mean CW ∼5-7 mm), for which there is virtually no available information on molting schedule. The only regular source of information on instars iv-v are cod stomach contents, while instars vi-vii are represented both in stomach contents and trawl survey samples.…”

Section: Discussionmentioning

confidence: 99%

“…SFDs from the OCSEAP survey and cod stomach contents were analyzed using the approach described by . Size at instar is not expected to differ significantly between males and females for crabs smaller than 35 mm, corresponding to instars i-vii (Kon and Sinoda 1992;Comeau et al 1998). Sexes were pooled for the analysis of SFDs of crabs in that size range.…”

Section: Size-frequency Distributionsmentioning

confidence: 99%

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Life history schedule and periodic recruitment of female snow crab (Chionoecetes opilio) in the eastern Bering Sea

ErnstBilly

ArmstrongDavid

Burgos

et al. 2012

Can. J. Fish. Aquat. Sci.

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Snow crab ( Chionoecetes opilio ) populations have fluctuated cyclically in eastern Canada and the eastern Bering Sea, where recruitment to the mature female pool has occurred over a period of three decades (1978–2007) in pulses with a mean period of 7 years. It has been hypothesized that this was the result of a parent–offspring relation between sequentially linked strong cohorts of mature primiparous females, which requires that periodicity matches the time lapsed between egg extrusion by the maternal broodstock and the offspring reaching maturity. We show that female age at maturity (post-settlement) varies between 4.5 and 7.5 years, with most females maturing at 5.5–6.5 years (7–8 years after egg extrusion). Pulses of female recruitment to the mature population do not show a latitudinal trend, consistent with uniformity in age-at-maturity. Results of tracking crab abundance and size–frequency distributions in cod stomach and trawl samples between successive pulses of the cycle are consistent with the hypothesis of serial linkage among pulses. Periodicity is reflected in trends of clutch fullness and average shell condition and in the negative correlation between the strength of primiparous female cohorts and the mean size of their members.

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Section: Discussionmentioning

confidence: 99%

Section: Size-frequency Distributionsmentioning

confidence: 99%

Life history schedule and periodic recruitment of female snow crab (Chionoecetes opilio) in the eastern Bering Sea

ErnstBilly

ArmstrongDavid

Burgos

et al. 2012

Can. J. Fish. Aquat. Sci.

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“…However, since immature sperm cells have a more elaborate cytoplasm and cell machinery than spermatozoa, the more likely conclusion is that storage of immature sperm cells instead favors sperm survival. Therefore, the passing to females of immature sperm cells that can subsequently develop into spermatozoa could be an adaptation to the long storage times that characterize the snow crab (up to 5 years, according to Kon and Sinoda 1992) and would contribute to reducing sperm wastage and promoting fertilization success for females relying on stored sperm.…”

Section: Site Of Sperm Differentiation and Maturationmentioning

confidence: 99%

Reproductive products in the adult snow crab (Chionoecetes opilio). II. Multiple types of sperm cells and of spermatophores in the spermathecae of mated females

Sainte-Marie¹,

Sainte‐Marie²

1999

Can. J. Zool.

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Contents of the spermathecae of mated adult snow crabs (Chionoecetes opilio) were examined by light microscopy. The contents could consist of water and three basic types of amorphous matter and of spermatophores. Water was present in the form of large patches or smaller spheres. Of the two major types of amorphous matter, one reacted positively and one negatively to periodic acid -Schiff's reagent (PAS), and one was only, and one predominantly, of male origin. The minor type of amorphous matter was orange and of female origin and could include dark cellular debris. Spermatophores enclosed either immature spermatids, mature spermatids, hitherto unreported spermatozoa, or cell forms intermediate between these three types. Peripheral mature spermatids and spermatozoa had a polarized orientation and were attached to the spermatophore wall. Overall, amorphous matter and spermatophores were topographically segregated by type within a spermatheca, and spermatophores enclosing immature spermatids occurred mostly in PAS-negative amorphous matter. Spermatid differentiation can unfold in the female reproductive tract as well as in the vas deferens, while the transformation of spermatids into spermatozoa was observed only in the female. The diversity of sperm cell types and the ordered placement of semen constituents within the spermatheca suggest that sperm are partitioned for short-or long-term use.Résumé : Le contenu des spermathèques de Crabes des neiges (Chionoecetes opilio) adultes a été examiné par microscopie photonique. Les spermathèques peuvent contenir de l'eau et trois types fondamentaux de matière amorphe et de spermatophores. L'eau est présente sous forme de grandes nappes ou de petites sphères. Les deux types majeurs de matière amorphe réagissent respectivement de manière positive et négative à l'acide périodique Schiff (APS) et sont respectivement uniquement ou principalement d'origine mâle. Le type mineur de matière amorphe est orangé et d'origine femelle et peut contenir des débris cellulaires foncés. Les spermatophores renferment des spermatides immatures, des spermatides matures ou des spermatozoïdes, ces derniers n'ayant jamais été signalés à ce jour, ou des formes intermédiaires entre ces trois types cellulaires. Les spermatides matures et les spermatozoïdes périphériques ont une orientation polarisée par rapport à la paroi du spermatophore et y sont rattachés. Généralement, la matière amorphe et les spermatophores sont topographiquement séparés par type dans une spermathèque et les spermatophores à spermatides immatures se retrouvent principalement dans de la matière amorphe réagissant négativement à l'APS. La différenciation des spermatides peut survenir dans le tractus reproducteur femelle autant que dans le vas deferens, mais la transformation des spermatides matures en spermatozoïdes n'a été observée que chez la femelle. La diversité et la répartition ordonnée des constituants de la semence à l'intérieur de la spermathèque suggèrent que le sperme est partitionné pour un usage immédiat ou futur. Sai...

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“…In multiple-mated nulli-parous females, stratification of rival sperm and positional advantage of most recently deposited sperm within the female reproductive tract confer paternity on the last male to inseminate a female before oviposition (Urbani et al 1998a). Sperm deposits can be stored in the female's spermathecae over several years, for autonomous fertilization of subsequent egg clutches in the absence of males (Kon & Sinoda 1992, Elner & Beninger 1995, Sainte-Mane & Carriere 1995.…”

Section: Introductionmentioning

confidence: 99%

Multiple choice criteria and the dynamics of assortative mating during the first breeding season of female snow crab Chionoecetes opilio (Brachyura, Majidae)

Sainte‐Marie¹,

Urbani²,

Sévigny³

et al. 1999

Mar. Ecol. Prog. Ser.

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Crab p a r s , consisting of a male grasping another crab (the graspee), were collected by divers during the first breeding season of female snow crab Chionoecetes opllio Different types of graspees were found and were ranked according to their reproductive value to the male. High-value graspees were pubescent females (close to their terminal matunty molt) and nulliparous females ljust molted and close to oviposition). Postn~olt prirmparous females (clean-soft shell and carrying eggs) also mated and were inseminated by males, but they were of less value than pubescent or nulliparous females as there was only a remote chance that the males' stored sperm would be used to fertilize the next egg clutch. Females copulated with up to 6 different males dunng their first breeding season. Another category of graspees including males and juvenile females provided the grasping male with no fecundity benefit. Pubescent females paired with males u p to 13 d before molting. Males grasping the high-value pubescent and nulliparous females were larger, had a harder shell, and were missing fewer limbs than the males grasping low-value primiparous females, other males or juvenile females and than the overall population of adult males on the mating grounds assessed by trawl. Size-assortative mating by male chela size and female carapace width occurred in the predominant pubescent pairs. Moreover, males with larger chelae were associated with pubescent females missing fewer limbs or having relatively narrower abdomens. Both traits may influence female survivorship and lifetime fecundity. The complex assortative mating pattern of snow crabs apparently denves from mate choice and male sexual competition in the context of prolonged attractiveness of pubescent females to males

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Zuwai crab population

Cited by 8 publications

References 23 publications

Life history schedule and periodic recruitment of female snow crab (Chionoecetes opilio) in the eastern Bering Sea

Life history schedule and periodic recruitment of female snow crab (Chionoecetes opilio) in the eastern Bering Sea

Reproductive products in the adult snow crab (Chionoecetes opilio). II. Multiple types of sperm cells and of spermatophores in the spermathecae of mated females

Multiple choice criteria and the dynamics of assortative mating during the first breeding season of female snow crab Chionoecetes opilio (Brachyura, Majidae)

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