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Recent quantitative values of Macrohectopus branickii (Dyb.) (amphipoda) from Lake Baikal
Affiliation:1. Division of Polar Life Sciences, Korea Polar Research Institute, Yeonsu-gu, Incheon 406-840, South Korea;2. Polar Sciences, University of Science & Technology, Yuseong-gu, Daejeon 305-333, South Korea;1. U.S. Geological Survey, Great Lakes Science Center, 1451 Green Rd., Ann Arbor, MI 48105, USA;2. Department of Environmental and Forestry Biology, The State University of New York, 250 Illick Hall, 1 Forestry Dr., Syracuse, NY 13210, USA;3. Great Lakes Laboratory for Fisheries and Aquatic Sciences, Fisheries and Oceans Canada, 867 Lakeshore Rd., Burlington, Ontario, Canada;4. The Great Lakes Genetics/Genomics Laboratory, Lake Erie Center and the Department of Environmental Sciences, The University of Toledo, 6200 Bayshore Road, Toledo, OH 43616, USA;1. Ecological Modeling Laboratory, Department of Physical and Environmental Sciences, University of Toronto, Toronto, Ontario M1C 1A4, Canada;2. National Oceanic and Atmospheric Administration, Great Lakes Environmental Research Laboratory, Ann Arbor, MI 48108, USA;3. Environment Canada, Water Science and Technology, National Water Research Institute, Burlington, ON L7R 4A6, Canada;1. Limnological Institute SB RAS, 3, Ulan-Batorskaya St., Irkutsk 664033, Russia;2. Institute of Oceanology, RAS, 36, Nahimovski Pr, Moscow 117997, Russia
Abstract:Macrohectopus branickii is the only amphipod with an exclusively pelagic lifestyle. Although this species plays an important role in the diet of pelagic fish of Lake Baikal, there is no regular monitoring of its abundance. We present data on the status of the population from a lake-wide 2015 survey and compare these data with available historical information. The survey was conducted with a modified Juday net and simultaneous hydroacoustics profiling from up to 700 m depth to the surface. The abundance of M. branickii in the pelagic zone over depths >300 m in 2015 averaged 1700 ind/m2 (range 320–4090 ind/m2) and the biomass averaged 3.7 g/m2 (range 1.1–14.4 g/m2). Sites with the greatest abundance of M. branickii were located in the South and Middle Basins off the eastern shore. These values are comparable to the published data from 1950s to 1980s. The characteristics of nearshore aggregations of larger mature females were more variable and need further study.
Keywords:Zooplankton aggregation  Space distribution  Hydroacoustic data  Pelagic invertebrate
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