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Free Content Seasonal and vertical distributions of appendicularia in Volcano Bay, Hokkaido, Japan

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Seasonal and vertical distributions of appendicularians were studied in relation to the hydrographic structure in Volcano Bay (Funka Bay), southwest Hokkaido, into which Oyashio Water and Tsugaru Warm Water enter in spring and autumn, respectively. Fritillaria borealis f. typica and Oikopleura labradoriensis were abundant in spring with maxima in March. The vertical distribution of both species was quite different. The former species was always distributed in the surface layer, whereas the latter was dependent on Oyashio Water and its distribution moved downward with the sinking cold water. O. longicauda, O. fusiformis, and O. dioica were dominant in late autumn, although the period of their occurrence was different from each other. They were very similar in vertical distribution and their populations were primarily maintained in the surface layer. Appendicularia sicula was transported into the bay with Tsugaru Warm Water and distributed coincidentally with the depth of warm water. All the species showed a homogenous distribution in winter when the water column was vertically mixed. On the whole, seasonal and vertical distributions were governed by the hydrographic changes derived from the exchange between Oyashio Water and Tsugaru Warm Water. Nevertheless, different species showed different details in their distribution. These differences could be explained, to a considerable extent, by the differences in their habitats defined by temperature and salinity.

Document Type: Research Article

Publication date: September 1, 1985

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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