STABILIZING SELECTION ON EGG SIZE IN THE EUPHAUSIID, THYSANOESSA RASCHII (M. SARS, 1864) (EUPHAUSIACEA) IN THE BARENTS SEA BY S. F. TIMOFEEV 1 ) , V. V. SKLYAR 2 ) and M. V. SAVINOV 2 ) 1 ) Murmansk Marine Biological Institute, Vladimirskaya St., 17, Murmansk 183010, Russia 2 ) Murmansk State Pedagogical University, Egorova St., 15, Murmansk 183038, Russia ABSTRACT 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 300 µ m and bigger than 350 µ m; perivitelline space smaller than 25 µ m and bigger than 50 µ m). 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 . RÉSUMÉ 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.
Crustaceana – Brill
Published: Jan 1, 2004
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