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Copepod community structure and physiological rates shape the biological pump during early North Atlantic spring bloom
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DOI：10.1002/lno.70433.png)
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Abstract
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Zooplankton plays an important role in the biological carbon pump, and zooplankton biomass and community structure can have a large influence on the sedimentation/remineralization balance of the water column. We investigated the potential effects of zooplankton community structure and eco-physiology on the export and attenuation of vertical flux during an early North Atlantic spring bloom, using Calanus finmarchicus as a representative of large vertically migrating calanoids that primarily feed on suspended phytoplankton and produce large fast sinking fecal pellets, and Microsetella norvegica, Oncaea/Triconia spp. and Oithona spp. as representatives of aggregate- and detritus-feeding copepods. We measured (1) diurnal changes in the pellet production, egg production and respiration rates of Calanus finmarchicus and (2) weight-specific egg production of egg-carrying non-calanoid copepods and combined these with (3) the vertical distribution of copepod biomass and species composition. Our results demonstrated many-fold differences in the carbon demand of the copepod community over a few weeks of winter–spring transition, as well as many-fold differences in the vertical profiles of particle production vs. degradation depending on the zooplankton community structure.
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