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- W2567961600 abstract "Biogeochemistry in marine plankton communities is strongly influenced by the activities of microbial species. Understanding the composition and dynamics of these assemblages is essential for modeling emergent community-level processes, yet few studies have examined all of the biological assemblages present in the plankton, and benchmark data of this sort from time-series studies are rare. Abundance and biomass of the entire microbial assemblage and mesozooplankton (>200 µm) were determined vertically, monthly and seasonally over a 3-year period at a coastal time-series station in the San Pedro Basin off the southwestern coast of the USA. All compartments of the planktonic community were enumerated (viruses in the femtoplankton size range [0.02–0.2 µm], bacteria + archaea and cyanobacteria in the picoplankton size range [0.2–2.0 µm], phototrophic and heterotrophic protists in the nanoplanktonic [2–20 µm] and microplanktonic [20–200 µm] size ranges, and mesozooplankton [>200 µm]. Carbon biomass of each category was estimated using standard conversion factors. Plankton abundances varied over seven orders of magnitude across all categories, and total carbon biomass averaged approximately 60 µg C l −1 in surface waters of the 890 m water column over the study period. Bacteria + archaea comprised the single largest component of biomass (>1/3 of the total), with the sum of phototrophic protistan biomass making up a similar proportion. Temporal variability at this subtropical station was not dramatic. Monthly depth-specific and depth-integrated biomass varied 2-fold at the station, while seasonal variances were generally <50%. This study provides benchmark information for investigating long-term environmental forcing on the composition and dynamics of the microbes that dominate food web structure and function at this coastal observatory. • Total plankton (viruses to mesozooplankton) was measured of southern California.. • Overall, plankton abundances varied by seven orders of magnitude. • Bacterial biomass averaged was nearly 40% of total biomass but mesozooplankton contributed ≤4%. • Seasonal changes in biomass were modest (<50%), depth-integrated values varied 2-fold." @default.
- W2567961600 created "2017-01-13" @default.
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- W2567961600 date "2017-03-01" @default.
- W2567961600 modified "2023-10-18" @default.
- W2567961600 title "Planktonic food web structure at a coastal time-series site: I. Partitioning of microbial abundances and carbon biomass" @default.
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