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Small Phytoplankton Community Composition Cycles Annually With a Coastal Bloom
Bethany L F Stevens1, Rebecca J Gast2, Emily E Peacock2
1Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara, California, USA.
Environmental Microbiology
|November 6, 2025
Summary
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.
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.
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