Details:

Journal Title:
Harmful Algae
Personal Author:
Einarsson, S.V. ; Lowry, K.E. ; Lin, P. ; Pickart, R.S. ; Ashjian, C.J. ; ... More +
Einarsson, S.V. ; Lowry, K.E. ; Lin, P. ; Pickart, R.S. ; Ashjian, C.J. ; Chappell, P.D. Less -
Description:
The harmful algal genus Alexandrium has characteristically been found in temperate and subtropical regions; however recent evidence suggests global warming may be expanding its range into high latitude waters. Alexandrium cysts have previously been documented in the Chukchi Sea and we hypothesize that Alexandrium may be expanding further into the Arctic due to distribution by the Beaufort shelfbreak jet. Here we document the presence of Alexandrium catenella along the Alaskan Beaufort Sea shelf, marking an expansion of its known range. The observations of A. catenella were made using three different methods: FlowCAM imaging, 18S eukaryotic sequencing, and real-time quantitative PCR. Four occupations of a shelf/slope transect spanned the evolution of a strong wind-driven upwelling event over a 5-day period. A nearby mooring provided the physical context for the event, revealing that enhanced easterly winds reversed the Beaufort shelfbreak jet to the west and induced upwelling of colder, denser water onto the outer shelf. A. catenella sequences dominated the surface phytoplankton community at the onset of the upwelling event. This signal vanished during and after the event, likely due to a combination of alongstream advection, cross-stream advection, and wind mixing. These results suggest contrasting physical processes that are both subject to global warming amplification, delivery of warm waters via the Beaufort shelfbreak jet and upwelling, may control the proliferation of this potential harmful alga into the Arctic.
Keywords:
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Alexandrium Catenella Saxitoxin Upwelling (Oceanography) Shelfbreak jet
Source:
Harmful Algae 120 (2022) 102346
DOI:
https://doi.org/10.1016/j.hal.2022.102346
Document Type:
Journal Article
Funding:
Grant no. NA14OAR4320158
Place as Subject:
Beaufort Sea ; Arctic regions
Beaufort Sea ; Arctic regions Less -
Rights Information:
Accepted Manuscript
Compliance:
Submitted
Main Document Checksum:
[+]
urn:sha256:21f0599a653b2167f619ede2d31c14c128b04e1ceecbba0c98aaa5759d6a6d33
Download URL:
https://repository.library.noaa.gov/view/noaa/48035/noaa_48035_DS1.pdf
File Type:

Supporting Files

• 	Supplemental media	pdf
  	Available dataset	xlsx

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