Seasonal and spatial variations of zooplankton in the central and southeastern Bering Sea during the mid-1990s |
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| Institution: | 1. West Sea Fisheries Research Institute, 707 Eulwang-dong, Jung-gu, Incheon 400-420, Korea;2. Department of Marine Biology, Pukyong National University, 599-1, Daeyeon 3-dong, Nam-gu, Busan 608-737, Korea;3. Department of Life Science, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Korea;1. Department of Biological Science, College of Science, Sungkyunkwan University, Suwon 16419, South Korea;2. Department of Food and Nutrition, College of Health Science, Honam University, Gwangju 62399, South Korea;3. Department of Food and Nutrition, College of Human Ecology, Hanyang University, Seoul 04763, South Korea;1. National Research Institute of Fisheries Science, Japan Fisheries Research and Education Agency, 2-12-4 Fukuura, Kanazawa, Yokohama, Kanagawa 236-8648, Japan;2. Tohoku National Fisheries Research Institute, Japan Fisheries Research and Education Agency, 3-27-5 Shinhama, Shiogama, Miyagi 985-0001, Japan;3. Hokkaido National Fisheries Research Institute, Japan Fisheries Research and Education Agency, 116 Katsurakoi, Kushiro, Hokkaido 085-0802, Japan;4. Headquarters, Japan Fisheries Research and Education Agency, 2-3-3 Minatomirai, Nishi, Yokohama, Kanagawa 220-6115, Japan;1. Department of Otolaryngology – Head and Neck Surgery, College of Medicine, Hanyang University, Seoul, Republic of Korea;2. Department of Internal Medicine, College of Medicine, Hanyang University, Seoul, Republic of Korea;1. Department of Mathematical Sciences, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-747, Republic of Korea;2. Facultad de Matemáticas, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Santiago, Chile;3. Center for Mathematical Challenges, Korea Institute for Advanced Study, Seoul, 130-722, Republic of Korea;1. Department of Life and Environmental Sciences, Polytechnic University of Marche, Ancona, Italy;2. Stazione Zoologica Anton Dohrn, Naples, Italy;3. National Research Council of Italy, Institute of Marine Sciences, Venice, Italy;4. GRC Geociències Marines, Departament de Dinàmica de la Terra i de l’Oceà, Facultat de Geologia, Universitat de Barcelona, 08028 Barcelona, Spain;5. GRID Arendal, N-4802 Arendal, Norway;6. Limnology Laboratory, Department of Biology, University of Regina, Regina, Saskatchewan, Canada;7. CEntre de Formation et de Recherche sur les Environnements Méditerranéens (CEFREM) UMR 5110 CNRS-Université de Perpignan, France;8. National Research Council of Italy, Institute of Marine Sciences, Bologna, Italy;1. Department of Civil and Environmental Engineering, Hanyang University, Seoul, South Korea;2. Central Scientific Instruments Organisation (CSIR-CSIO), Sector 30 C, Chandigarh, 160030, India |
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| Abstract: | Hydrographic and plankton surveys were conducted over the basin and slope of the southeastern Bering Sea during April, June/July and September of 1994 and in June/July 1995, and seasonal and spatial variations of zooplankton community were investigated in relation to the oceanographic conditions. In July 1994, sea surface temperature (SST) ranged 5.3–8.7 °C, and the thermocline was between 30 and 50 m. In July 1995, however, SST was warmer (7.3–12.4 °C), and the thermocline was shallower (20–30 m). The thermal front at the shelf was also stronger in July 1995 than in July 1994. Surface salinity was higher in 1994 than 1995. A total of 17 taxonomic groups of zooplankton were identified from the plankton samples. In 1994, the highest density was observed in September. Copepods were the major taxon during all surveys. While some taxa such as euphausiids, ostracods, and Neocalanus spp. were most abundant in spring, others such as Calanus spp., Metridia pacifica, chaetognaths, and pteropods were most abundant in September. Adults and late-stage copepodites of Eucalanus bungii were abundant in spring, and were replaced by 1st–3rd stages of copepodites in summer. Zooplankton density was ca. 4 times higher in 1995 than in 1994, in part because of warm water temperature. |
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