Abundance and biomass of copepods and cladocerans in Atlantic and Arctic domains of the Barents Sea ecosystem
JOURNAL OF PLANKTON RESEARCH(2023)
摘要
Zooplankton in the Barents Sea have been monitored annually with a standard procedure with determination of size-fractioned biomass since the mid-1980s. Biomass of copepods and cladocerans was estimated based on measured abundance and individual weights taken from literature. Calanus species were dominant, making up similar to 85% of the estimated biomass of copepods. The second most important taxon was Oithona spp. (similar to 0.5 g dry weight (dw) m(-2), similar to 10%), followed by Metridia spp. (similar to 0.15 g dw m(-2), 2-3%) and Pseudocalanus spp. (0.10-0.15 g dw m(-2), 1-5%). Estimated biomass of cladoceran taxa (Evadne and Podon) was low (0.01 g dw m(-2)). Calanus spp. contributed most of the biomass of the medium size fraction (1-2 mm), whereas small copepod species (Oithona, Pseudocalanus and others) contributed to the small size fraction (<1 mm). Estimated biomass of Calanus spp. and of the sum of small copepod species were both positively correlated with measured total zooplankton biomass (R-2 = 0.72 and 0.34, respectively). The biomass ratio of small copepod species to Calanus was similar in Atlantic and Arctic water masses (similar to 0.15-0.2) but tended to increase with decreasing total biomass. This suggests a shift to relatively larger roles of small copepods as Calanus and total biomass decrease.
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关键词
barents sea ecosystem,copepods,arctic domains,cladocerans
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