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Comparative Life Histories of Two Populations of the Introduced Crayfish Orconectes Rusticus (Girard, 1852) in Ontario

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image of Crustaceana

En dehors de la fécondité, il n'y a pas de différences majeures entre les populations d'Orconectes rusticus (Girard, 1852) vivant dans les rivières et dans les lacs. De petites différences ont été notées en ce qui concerne la répartition par âge et l'entrée des jeunes-de-l'année dans les populations. Le type général du cycle biologique d'O. rusticus est le même que celui des autres écrevisses du genre Orconectes. Des différences dans la taille, la fécondité, l'époque d'entrée des jeunes-de-l'année dans les populations entre O. rusticus et O. propinquus (Girard, 1852) dans la rivière Eramosa expliquent comment O. rusticus, en compétition avec O. propinquus, exclut ce dernier dans certains secteurs de la même rivière.

Affiliations: 1: Department of Zoology, University of Guelph, Guelph, Ontario, N1G 2W1 Canada


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