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Species composition and distribution of marine nekton in the Pacific Ocean off Oregon

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https://ir.library.oregonstate.edu/concern/defaults/1c18dm29r

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  • Knowledge of the pelagic organisms in vast areas of the open ocean is very limited. This is particularly true of the small nekton or swimming forms such as fishes, squid, prawns and euphausiids, which are important as intermediate animals in the food chain and are preyed upon by species such as salmon and albacore. Although small nekton and macroplankton are often known to undertake daily vertical migrations, virtually nothing is known about their horizontal movements or their seasonal variations in time and space. There is a need, therefore, for basic research on the ecology and behavior of these common pelagic animals. A biological study in the Pacific Ocean off Oregon is desirable: first, because several species of small nekton found to accumulate the radionuclide Zinc-65 discharged by the Columbia River may be instrumental in the transport of this isotope at sea; secondly, because the area has never been adequately surveyed, so our knowledge of the composition of the pelagic community is meager. During the summer of 1961, we initiated an investigation of the ocean off Oregon which entails systematic sampling throughout the year with a high-speed midwater trawl. Comparison of seasonal differences in species composition and relative abundance is obviously premature at this time and must await the completion of a year's sampling. This initial progress report, therefore, is confined to a preliminary listing of the animals collected, an assessment of sampling problems, and the variations associ­ated with daily vertical migrations and depth distribution.
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file details COAS_ref_62_8.pdf 2017-12-06 公开 下载