Abstract
This study aimed to quantify the impact of copepod grazing on the productivity of phytoplankton during an under sea-ice spring phytoplankton bloom (USPB) in western Baffin Bay. To quantify positive and/or negative impacts of copepod grazing on primary production and the interaction between copepod grazing and phytoplankton species, we sampled seawater and zooplankton under the landfast sea ice every 2–3 days between May 24 and July 10, 2016. Samples were analyzed for estimation of primary production, chlorophyll-a (chl-a) concentration, diatom abundance, and copepod fecal pellet (FP) production/grazing rate. Analyses of chl-a concentration, primary production, and FP production/grazing rate revealed clear temporal changes and a mismatch between primary production and copepod consumption. The FP production/grazing rate reached a maximum (9.4/31.2 mg C m–2 d–1) on June 16 before the USPB phase and suddenly decreased to 0.7/2.4 mg C m–2 d–1 on June 21, despite an increase in primary production to 74.0 mg C m–2 d–1. The copepod grazing rate (3.7 mg C m–2 d–1) was low relative to primary production (344.6 mg C m–2 d–1) during the USPB phase (after June 20). While our estimates illustrate that copepod grazing did not limit the maximum daily primary production during the USPB, the low grazing pressure (2% of primary production) may have been an additional contributor to the reduction in total primary productivity at the end of the USPB period due primarily to the low supply of regenerated nitrogen-containing nutrients to drive regenerated production.
Highlights
IntroductionIn the context of global change, many studies on the fate of primary productivity have been conducted to quantify the responses of the marine ecosystem and biogeochemical cycling to ongoing alteration of the physical environment, such as sea-ice and glacial ice conditions in Arctic (Canada) - CNRS (France), Quebec, QC, Canada 5 Mediterranean Institute of Oceanography, Marseille, France 6 Arctic Research Center, Hokkaido University, Sapporo, Hokkaido, Japan 7 Office for Enhancing Institutional Capacity, Hokkaido
In the context of global change, many studies on the fate of primary productivity have been conducted to quantify the responses of the marine ecosystem and biogeochemical cycling to ongoing alteration of the physical environment, such as sea-ice and glacial ice conditions in Arctic (Canada) - CNRS (France), Quebec, QC, Canada 5 Mediterranean Institute of Oceanography, Marseille, France 6 Arctic Research Center, Hokkaido University, Sapporo, Hokkaido, Japan 7 Office for Enhancing Institutional Capacity, HokkaidoUniversity, Sapporo, Hokkaido, Japan 8 National Institute of Polar Research, Tachikawa, Tokyo, JapanPrimary production is affected by top-down control and bottom-up control in the water column (e.g., Verity and Smetacek, 1996; Wassmann, 1998)
We address the quantitative impacts of copepod grazing on the under sea-ice spring phytoplankton bloom (USPB) in southwestern Baffin Bay, Canadian Arctic
Summary
In the context of global change, many studies on the fate of primary productivity have been conducted to quantify the responses of the marine ecosystem and biogeochemical cycling to ongoing alteration of the physical environment, such as sea-ice and glacial ice conditions in Arctic (Canada) - CNRS (France), Quebec, QC, Canada 5 Mediterranean Institute of Oceanography, Marseille, France 6 Arctic Research Center, Hokkaido University, Sapporo, Hokkaido, Japan 7 Office for Enhancing Institutional Capacity, Hokkaido. Primary production is affected by top-down control (i.e., controlled by feeders) and bottom-up control (i.e., controlled by nutrient availability and photosynthetically active radiation in sea-ice-covered waters) in the water column (e.g., Verity and Smetacek, 1996; Wassmann, 1998).
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
