Seasonal phytoplankton blooms in the North Atlantic linked to the overwintering strategies of copepods

Public Deposited
Analytics

Downloadable Content

Download PDF
Request Version for Screen Reader
Creator
  • Friedland, K.D.
    • Other Affiliation: National Marine Fisheries Service
  • Record, N.R.
    • Other Affiliation: Bigelow Laboratory for Ocean Sciences
  • Asch, R.G.
    • Other Affiliation: Princeton University
  • Kristiansen, T.
    • Other Affiliation: Institute of Marine Research
  • Saba, V.S.
    • Other Affiliation: Princeton University
  • Drinkwater, K.F.
    • Other Affiliation: Institute of Marine Research
  • Henson, S.
    • Other Affiliation: National Oceanography Centre
  • Leaf, R.T.
    • Other Affiliation: University of Southern Mississippi
  • Morse, R.E.
    • Other Affiliation: National Marine Fisheries Service
  • Johns, D.G.
    • Other Affiliation: Sir Alister Hardy Foundation for Ocean Sciences
  • Large, S.I.
    • Other Affiliation: ICES
  • Hjøllo, S.S.
    • Other Affiliation: Institute of Marine Research
  • Nye, J.A.
    • Affiliation: Institute of Marine Sciences
    • Other Affiliation: Stony Brook University
  • Alexander, M.A.
    • Other Affiliation: NOAA
  • Ji, R.
    • Other Affiliation: Woods Hole Oceanographic Institution
Abstract
  • The North Atlantic Ocean contains diverse patterns of seasonal phytoplankton blooms with distinct internal dynamics. We analyzed blooms using remotely-sensed chlorophyll a concentration data and change point statistics. The first bloom of the year began during spring at low latitudes and later in summer at higher latitudes. In regions where spring blooms occurred at high frequency (i.e., proportion of years that a bloom was detected), there was a negative correlation between bloom timing and duration, indicating that early blooms last longer. In much of the Northeast Atlantic, bloom development extended over multiple seasons resulting in peak chlorophyll concentrations in summer. Spring bloom start day was found to be positively correlated with a spring phenology index and showed both positive and negative correlations to sea surface temperature and the North Atlantic Oscillation in different regions. Based on the characteristics of spring and summer blooms, the North Atlantic can be classified into two regions: a seasonal bloom region, with a well-defined bloom limited to a single season; and a multi-seasonal bloom region, with blooms extending over multiple seasons. These regions differed in the correlation between bloom start and duration with only the seasonal bloom region showing a significant, negative correlation. We tested the hypothesis that the nearsurface springtime distribution of copepods that undergo diapause (Calanus finmarchicus, C. helgolandicus, C. glacialis, and C. hyperboreus) may contribute to the contrast in bloom development between the two regions. Peak near-surface spring abundance of the late stages of these Calanoid copepods was generally associated with areas having a well-defined seasonal bloom, implying a link between bloom shape and their abundance. We suggest that either grazing is a factor in shaping the seasonal bloom or bloom shape determines whether a habitat is conducive to diapause, while recognizing that both factors can re-enforce each other.
Date of publication
Keyword
DOI
Identifier
Resource type
  • Article
License
  • Attribution 4.0 International
Journal title
  • Elementa
Journal volume
  • 2016
Language
  • English
Version
  • Publisher
ISSN
  • 2325-1026
Publisher
  • University of California Press

Relations

Parents:

This work has no parents.

Items

Thumbnail Title Date Uploaded Visibility Actions
file details 23-190-1-ce.pdf 2022-08-10 Public Download