COMPARISON OF ZOOPLANKTON ABUNDANCE UNDER SEA ICE BETWEEN NIPR NET AND NORPAC NET SAMPLINGS, IN LAGOON SAROMA KO, HOKKAIDO (Ninth Symposium on Polar Biology)
スポンサーリンク
概要
- 論文の詳細を見る
Zooplankton under sea ice were collected vertically and horizontally at two stations (7-11 m depth) in lagoon Saroma Ko, Hokkaido, on February 21-24,1986, and their abundance was compared by haul, mesh size, depth, sampling duration, and sampling station. Vertical hauls from the bottom to the surface were made with a standard Norpac net and its modified net, and horizontal samplings with a NIPR net (under-ice plankton sampler) from 0.3,2 and 5 m, and bottom layers. Three mesh sizes, 100, 330 and 505 μ, were used for each net. Copepods (mostly Pseudocalanus sp.) and chaetognath (Sagitta elegans) predominated the biomass in weight and number with a few amphipods. In vertical hauls with 100 μ-mesh Norpac net, the copepod abundance was similar between the two stations, while the chaetognath abundance was significantly greater at Stn. 11 than at Stn. 3. In horizontal samplings with the 100 μ-niesh NIPR net, copepods were very abundant in the 0.3 and 2 m layers, but were fewer in the 5 m and bottom layers. Chaetognath revealed a distinct vertical stratification with a highest abundance in the 2 m layer and scarcity in the 0.3 m and bottom layers. Compared with a 5-min filtration, the 10- and 15-min filtration in the 330 μ- and 505 μ-mesh NIPR nets showed a decrease of the zooplankton catches per unit time. The modified Norpac net collected significantly abundant chaetognath than the standard Norpac net, but not for copepods.
- 国立極地研究所の論文
著者
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Watanabe Kentaro
National Institute of Polar Research, Kaga 1-chome, Itabashi-ku, Tokyo 173-8515, Japan
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Fukuchi Mitsuo
National Institute of Polar Research, 10-3 Midori-cho, Tachikawa-shi, Tokyo 190-8518, Japan
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Aota Masaaki
Institute of Low Temperature Science, Hokkaido University
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TANIMURA Atsushi
National Institute of Polar Research
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Watanabe Kentaro
National Institute Of Polar Research
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Watanabe K
National Institute Of Polar Research Kaga 1-chome Itabashi-ku Tokyo 173-8515 Japan
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Aota Masaaki
Institute Of Low Temperature Science Hokkaido University
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NISHIYAMA Tsuneo
Institute of Marine Science, University of Alaska-Fairbanks
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Fukuchi M
National Inst. Polar Res. Tokyo
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Fukuchi Mitsuo
National Inst. Of Polar Res. Kaga Tokyo 173-8515 Jpn
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Nishiyama Tsuneo
Institute Of Marine Science University Of Alaska:(present Address)institute Of Oceanic Research And
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Nishiyama Tsuneo
Department Of Marine Science And Technology Hokkaido Tokai University
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Tanimura A
Kyoto Prefectural Univ. Kyoto Jpn
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Fukuchi Mitsuo
National Inst. Of Polar Res. 10-3 Midori-cho Tachikawa Tokyo 190-8518 Jpn
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Tanimura Atsushi
National Institute of Polar Resarch
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