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Seasonal shifts in marine phytoplankton composition on the Northeast US Shelf were analyzed over nine years. Chlorophyta, particularly Bathycoccus, Micromonas, and Picochlorum, dominated the small phytoplankton community, driving seasonal changes.

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Area of Science:

  • Marine biology
  • Oceanography
  • Microbial ecology

Background:

  • Small photosynthetic eukaryotes are crucial primary producers in marine ecosystems.
  • Understanding seasonal dynamics of phytoplankton communities is vital for marine food webs.
  • The Northeast US Shelf is a productive coastal region with dynamic planktonic communities.

Purpose of the Study:

  • To investigate seasonal changes in the community composition of small phytoplankton.
  • To correlate phytoplankton abundance and division rates with community shifts.
  • To identify dominant phytoplankton genera and their seasonal patterns on the Northeast US Shelf.

Main Methods:

  • Analysis of a 9-year time series of 18S rRNA sequencing data.
  • High-resolution in situ flow cytometry measurements of phytoplankton abundance and division rates.
  • Comparison of molecular data with cell-based measurements to understand community dynamics.

Main Results:

  • Gradual, repeatable annual transitions were observed in the pico- and nanoplankton community.
  • Chlorophyta were a major contributor to sequences and seasonal variability.
  • Dominant genera included Bathycoccus (year-round), Micromonas bravo and Picochlorum (summer), and a winter Phaeocystis signal.

Conclusions:

  • The study provides fundamental knowledge of phytoplankton taxonomic composition on the Northeast US Shelf.
  • Seasonal succession of phytoplankton is driven by specific genera like Chlorophyta.
  • Understanding these dynamics enhances knowledge of regional marine biodiversity and variability.