Environmental controls upon picophytoplankton growth and biomass in a eutrophic estuary

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dc.contributor.authorWetz, Michael S.
dc.contributor.authorPaerl, Hans W.
dc.contributor.authorTaylor, Christopher
dc.contributor.authorLeonard, Jeremy A.
dc.date.accessioned2021-05-28T14:29:29Z
dc.date.available2021-05-28T14:29:29Z
dc.date.issued2011-03-31
dc.date.issued2011-03-31
dc.description.abstractWe assessed the role of top-down versus bottom-up factors in regulating picophytoplankton (PicoP) growth and overall phytoplankton size structure in a eutrophic estuary. PicoP biomass reached an annual maximum in summer/fall and was positively correlated with temperature. Ephemeral blooms (chlorophyll a > 20 µg l–1) of PicoP were observed in the upper and middle regions of the estuary despite inorganic nitrogen concentrations <1 µmol l–1. Nutrient-amended PicoP growth rates were similar to in situ growth rates in the upper estuary, and PicoP biomass was negatively correlated with river-derived inorganic nitrogen concentrations, indicating that regenerated nutrients are a major source of nitrogen supporting PicoP growth. Microzooplankton grazing rates routinely exceeded PicoP growth rates during summer; therefore, grazing must have become uncoupled from PicoP growth on timescales shorter than the interval between grazing experiments (i.e. 2 to 4 wk) for PicoP to have bloomed. Field data point to the possibility of trophic cascades involving copepods, protistan grazers, and phytoplankton as a mechanism for this growth–grazing uncoupling. These and other recent findings indicate that bottom-up factors alone cannot explain the PicoP blooms observed in some estuarine systems and emphasize the need for grazing control studies to better understand the regulation of primary production.en_US
dc.identifier.citationWetz MS, Paerl HW, Taylor JC, Leonard JA (2011) Environmental controls upon picophytoplankton growth and biomass in a eutrophic estuary. Aquat Microb Ecol 63:133-143. https://doi.org/10.3354/ame01488en_US
dc.identifier.doihttps://doi.org/10.3354/ame01488
dc.identifier.doihttps://doi.org/10.3354/ame01488
dc.identifier.urihttps://hdl.handle.net/1969.6/89658
dc.identifier.urihttps://hdl.handle.net/1969.6/89658
dc.publisherInter-Research
dc.subjectPicophytoplanktonen_US
dc.subjectEstuaryen_US
dc.subjectMicrozooplanktonen_US
dc.subjectMesozooplanktonen_US
dc.subjectTrophic ­cascadeen_US
dc.subjectNutrientsen_US
dc.titleEnvironmental controls upon picophytoplankton growth and biomass in a eutrophic estuaryen_US
dc.typeArticleen_US

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