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Stabilizing Selection on Egg Size in the Euphausiid, Thysanoessa Raschii (M. Sars, 1861)(Euphausiacea) in the Barents Sea

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[The size of the eggs (alive and dead) of the euphausiid, Thysanoessa raschii (M. Sars, 1864) was studied in the various parts of the Barents Sea. There is a relationship between mortality and size in euphausiid eggs. Dead embryos dominated among eggs with both minimal or maximal diameters (embryos smaller than 300μm and bigger than 350μm; perivitelline space smaller than 25μm and bigger than 50μm). We suggest that this size-dependent mortality of euphausiid eggs is a result of stabilizing selection, thus establishing an equilibrium between egg size and number of eggs (=fecundity) in the Barents Sea population of T. raschii . La taille des œufs (vivants et morts) de l'euphausiacé, Thysanoessa raschii (M. Sars, 1864) a été étudiée dans plusieurs zones de la mer de Barentz. Il existe une relation entre la mortalité et la taille chez les œufs d'euphausiacés. Les embryons morts dominent parmi les œufs de diamètre minimal et maximal (embryons de moins de 300μm ou de plus de 350μm; espace périvitellin inférieur à 25μm ou supérieur à 50μm). Nous suggérons que la mortalité dépendant de la taille des œufs d'euphausiacés est un résultat de la sélection stabilisatrice, qui assure un équilibre entre la taille des œufs et la fécondité dans la population de T. raschii de la mer de Barentz., The size of the eggs (alive and dead) of the euphausiid, Thysanoessa raschii (M. Sars, 1864) was studied in the various parts of the Barents Sea. There is a relationship between mortality and size in euphausiid eggs. Dead embryos dominated among eggs with both minimal or maximal diameters (embryos smaller than 300μm and bigger than 350μm; perivitelline space smaller than 25μm and bigger than 50μm). We suggest that this size-dependent mortality of euphausiid eggs is a result of stabilizing selection, thus establishing an equilibrium between egg size and number of eggs (=fecundity) in the Barents Sea population of T. raschii . La taille des œufs (vivants et morts) de l'euphausiacé, Thysanoessa raschii (M. Sars, 1864) a été étudiée dans plusieurs zones de la mer de Barentz. Il existe une relation entre la mortalité et la taille chez les œufs d'euphausiacés. Les embryons morts dominent parmi les œufs de diamètre minimal et maximal (embryons de moins de 300μm ou de plus de 350μm; espace périvitellin inférieur à 25μm ou supérieur à 50μm). Nous suggérons que la mortalité dépendant de la taille des œufs d'euphausiacés est un résultat de la sélection stabilisatrice, qui assure un équilibre entre la taille des œufs et la fécondité dans la population de T. raschii de la mer de Barentz.]

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/content/journals/10.1163/1568540041181547
2004-03-01
2016-12-10

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