Microbial food web dynamics in the oceanic Gulf of Mexico
نویسندگان
چکیده
Abstract Phytoplankton growth and microzooplankton grazing rates were measured in repeated profiles of dilution experiments incubated situ on a drift array order to assess microbial production food web characteristics the oligotrophic bluefin tuna spawning habitat Gulf Mexico (May peak seasons, 2017–2018). Grazing often exceeded with processes more balanced overall surface mixed layer, but biomass accumulated mid-euphotic zone. Community estimates (260–500 mg C m−2 day−1) low compared similar open-ocean studies Pacific Ocean. Prochlorococcus was consistent major contributor (113–204 productivity, while diatoms dinoflagellates (2–10 4–13 day−1, respectively) consistently low. Prymnesiophytes, most dynamic component (34–134 day−1), co-dominated 2017 experiments. Unexpected imbalances relative observed for all picoplankton populations (Prochlorococcus, Synechococcus heterotrophic bacteria), suggesting trophic cascade absence mesozooplankton predation large microzooplankton. Study sites abundant larval had shallowest deep chlorophyll maxima significant net positive phytoplankton below layer.
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ژورنال
عنوان ژورنال: Journal of Plankton Research
سال: 2021
ISSN: ['1464-3774', '0142-7873']
DOI: https://doi.org/10.1093/plankt/fbab021