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Bibliographie de l'Institut Maurice-Lamontagne

Crustacés - Décapodes - Crevettes / Sclerocrangon boreas / Crevette de roche, Crevette ciselée

C. GUAY, B. SAINTE-MARIE, J.-C. BRÊTHES, 2011. Strong maternal effects and extreme heterogeneity of progeny development in the caridean shrimp Sclerocrangon boreas (Crangonidae). Mar. Biol., 158(12): 2835-2845.

[Résumé disponible seulement en anglais]
Sclerocrangon boreas is uncommon among marine coastal carideans in having a non-dispersing, abbreviated (2-stage) larval phase. We investigated the implications of this strategy in terms of fecundity, oVspring provisioning and brood care in S. boreas from the St. Lawrence Gulf and Estuary in 2009–2010. Fecundity scaled positively to female body size but was low due to the production of large, lipid-rich eggs. Ovspring size at all stages of development was positively related to female size. Larval traits and lipid dynamics indicate obligatory lecithotrophic development from hatching to juvenile. The larva becomes a juvenile on the mother and remains associated with her for sometime after. The co-occurrence of early egg stages among many juveniles in some clutches raises the possibility that maternal care of juveniles includes the provisioning of trophic eggs or eggs reclaimed from other females.©2011 Springer

LACOURSIÈRE-ROUSSEL, A., B. SAINTE-MARIE, 2009. Sexual system and female spawning frequency in the sculptured shrimp Sclerocrangon boreas (decapoda : Caridea : Crangonidae). J. Crust. Biol., 29(2): 192-200.

[Résumé disponible seulement en anglais]
The nature of the sexual system (protandry, gonochory) and the frequency of female spawning (semelparous, iteroparous annual, iteroparous biennial) in the crangonid Sclerocrangon boreas remain uncertain. We addressed these questions by examining population sex ratio, anatomy and histology, and gonad and oö cyte sizes. Gonochory is supported by several facts: sex ratio was balanced at the smallest shrimp sizes, no intermediate sex form was found, and there was no evidence of degeneration of male gonad at the sizes where this might have been expected to occur. A majority of larger females, if not all, had a structure linking the ovary to the base of the fifth pereiopod but the presence of this structure on small females suggests it is not a degenerate vas deferens. Iteroparity is supported by the presence of two generations of oöcytes in females, including those gravid, and female biennial spawning is supported by the small size of ovaries/oöcytes in gravid females.©2009 The Crustacean Society

SAINTE-MARIE, B., I. BÉRUBÉ, S. BRILLON, F. HAZEL, 2006. Observations on the growth of the sculptured shrimp Sclerocrangon boreas (Decapoda : caridea). J. Crust. Biol., 26(1) : 55-62 .

[Résumé disponible seulement en anglais]
Little is known of the growth of the sculptured shrimp Sclerocrangon boreas, a remarkable member of arctic and subarctic marine shelf communities. We determined the length-weight relationship, abdomen allometry, and size structure of shrimp in a population of the Gulf of Saint Lawrence, eastern Canada. We also reared shrimp for up to 3.5 years to measure their growth. The presence of very small immature females in the wild population indicates that the sculptured shrimp is not obligatorily a protandric hermaphrodite, if at all. Females grow faster, reach a greater size, and live longer than males. Males may be ≥4 years old at 17 mm cephalothorax length (CL) and females ≥6 years old at 29 mm CL. Ovigerous females have a broader abdomen with longer pleopod setae than similarly-sized immature females. After releasing their progeny, some females may molt and grow in length but revert to a condition of narrow abdomen and short pleopod setae, and then molt again to a condition of broad abdomen with long pleopod setae. This finding and demographic data suggest that some females are alternate-year spawners. Other females did not molt for ≥2 years and may spawn in successive years.©2007 The Crustacean Society