Abstract
Total biomass and production are evaluated for taxonomic groups of zooplankton sampled with Juday net (mesh size 0.168 mm) from the 0-200 m layer in the Bering Sea in 1986-2018. The annual mean stock of zooplankton is assessed as 245.1 . 106 t WW, or by taxonomic groups: copepods — 135.0 . 106 t (55.1 %), chaetognaths — 664.4 . 106 t (26.3 %), euphausiids — 30.8 . . 106 t (10.8 %), medusas — 7.9 . 106 t (3.2 %), and hyperiids — 7.0 . 106 t (2.9 %). The gross annual yield is estimated as 1378.6 . 106 t for copepods (P/B = 9.3), 422.5 . 106 t for chaetognaths (P/B = 6.0), 212.5 . 106 t for euphausiids (P/B = 9.0), 132.4 . 106 t for net medusas (P/B = 16.7), and 90.9 . 106 t for hyperiids (P/B = 12.3). The total annual yield of 2281.9 . 106 t, on average, was formed as a sum of 107.4 . 106 t produced in winter (P/B = 1.0), 889.6 . 106 t — in spring (P/B = 2.4), 755.2 . 106 t — in summer (P/B = 2.8), and 529.6 . 106 t — in autumn (P/B = 2.2). This annual yield was produced mostly by non-predatory zooplankton (1613.8 . 106 t), but also by predatory zooplankton (668.1 . 106 t). Mean annual P/B-ratio for the entire zooplankton in the Bering Sea was 8.5 that was in 1.4 times lower than in the Okhotsk Sea (P/B = 11.8), mainly because of predominance of less productive Copepoda species.
Highlights
By predatory zooplankton (668.1 . 106 t)
Total biomass and production are evaluated for taxonomic groups of zooplankton sampled with Juday net from the 0–200 m layer in the Bering Sea in 1986–2018
Mean annual P/B-ratio for the entire zooplankton in the Bering Sea was 8.5 that was in 1.4 times lower than in the Okhotsk Sea (P/B = 11.8), mainly because of predominance of less productive Copepoda species
Summary
Планктон облавливался в 1986–2018 гг. в слое 0–200 м (0–дно при глубине менее 200 м) сетями БСД (площадь входного отверстия 0,1 м2, сито с ячеей 0,168 мм). Total biomass and production are evaluated for taxonomic groups of zooplankton sampled with Juday net (mesh size 0.168 mm) from the 0–200 m layer in the Bering Sea in 1986–2018. This annual yield was produced mostly by non-predatory zooplankton Представленные данные несут информацию по среднегодовой биомассе и продукции доминирующих групп сетного зоопланктона и их значимости (%) в планктоном сообществе эпипелагиали Берингова моря. Что в последние годы были представлены данные по зоопланктону Берингова моря и других районов [Волков, 1996; Шунтов, 2001, 2016; Дулепова, 2002; Чучукало, 2006; Шунтов, Темных, 2008; и др.]. Целью работы является обобщение многолетней информации по составу, значению биомассы и продукции, соотношению отдельных таксономических групп зоопланктона в планктонных сообществах эпипелагиали Берингова моря и сопоставление полученных данных с результатами предыдущих исследований
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