Details:

Journal Title:
PLOS ONE
Personal Author:
Lalande, Catherine ; Grebmeier, Jacqueline M. ; McDonnell, Andrew M. P. ; Hopcroft, Russell R. ; O’Daly, Stephanie ; ... More +
Lalande, Catherine ; Grebmeier, Jacqueline M. ; McDonnell, Andrew M. P. ; Hopcroft, Russell R. ; O’Daly, Stephanie ; Danielson, Seth L. Less -
NOAA Program & Office:
CINAR (Cooperative Institute for the North Atlantic Region)
Description:
Unusually warm conditions recently observed in the Pacific Arctic region included a dramatic loss of sea ice cover and an enhanced inflow of warmer Pacific-derived waters. Moored sediment traps deployed at three biological hotspots of the Distributed Biological Observatory (DBO) during this anomalously warm period collected sinking particles nearly continuously from June 2017 to July 2019 in the northern Bering Sea (DBO2) and in the southern Chukchi Sea (DBO3), and from August 2018 to July 2019 in the northern Chukchi Sea (DBO4). Fluxes of living algal cells, chlorophyll a (chl a), total particulate matter (TPM), particulate organic carbon (POC), and zooplankton fecal pellets, along with zooplankton and meroplankton collected in the traps, were used to evaluate spatial and temporal variations in the development and composition of the phytoplankton and zooplankton communities in relation to sea ice cover and water temperature. The unprecedented sea ice loss of 2018 in the northern Bering Sea led to the export of a large bloom dominated by the exclusively pelagic diatoms Chaetoceros spp. at DBO2. Despite this intense bloom, early sea ice breakup resulted in shorter periods of enhanced chl a and diatom fluxes at all DBO sites, suggesting a weaker biological pump under reduced ice cover in the Pacific Arctic region, while the coincident increase or decrease in TPM and POC fluxes likely reflected variations in resuspension events. Meanwhile, the highest transport of warm Pacific waters during 2017–2018 led to a dominance of the small copepods Pseudocalanus at all sites. Whereas the export of ice-associated diatoms during 2019 suggested a return to more typical conditions in the northern Bering Sea, the impact on copepods persisted under the continuously enhanced transport of warm Pacific waters. Regardless, the biological pump remained strong on the shallow Pacific Arctic shelves.
Keywords:
[+]
Algae
Copepoda
Zooplankton
Copepods
Diatoms
Larvae
Multidisciplinary
Sea Ice
Sea Water
Sediment

Source:
PLOS ONE, 16(8), e0255837
DOI:
https://doi.org/10.1371/journal.pone.0255837
Document Type:
Journal Article
Place as Subject:
Bering Sea ; Chukchi Sea
Bering Sea ; Chukchi Sea Less -
Rights Information:
CC BY
Compliance:
Submitted
Main Document Checksum:
[+]
urn:sha256:b85395be2cf66bcfa9268b084df871c9641cca19baf9de9e889340aa8f23616f
File Type:

Supporting Files

• Machine readable version (XML)

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