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Systematic and ecological studies on copepoda in Indian Arm, British Columbia Shan, Kuo-Cheng

Abstract

A survey of the biological oceanography in Indian Arm, a fjord-type inlet near Vancouver, B. C, has been carried out during the past several, years by the Institute of Oceanography of the University of British Columbia. The present study deals with four species of Copepoda, and their distribution and relationships to water properties. A systematic study of four of the most abundant pelagic calanoid copepods was undertaken, namely, Calanus sp., Gaetanus armiger Gdesbrecht, Pareuchaeta japonica (Marukawa), and Metridia sp.. Some suggestions on the taxonomy of the four species in the local area are made. The life history stages of Calanus sp. and Gaetanus armiger have been briefly described. Life cycles of these two species within a year have been evaluated. Water properties represented by temperature, salinity, and dissolved oxygen have been viewed in relation to the distribution of Calanus sp. and Gaetanus armiger. Adult males and females of both species are demonstrated as inhabiting waters with different ranges of properties. Stage V of the juveniles of Calanus inhabits conditions intermediate between those of males and females. Stage I of the juveniles of Gaetanus armiger occurs in a restricted range of properties, but the range widens with each successive stage. The distributions of copepodid stages and adults of the two species are shown to conform, in general, to the ranges of properties to which relationships have been demonstrated.

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