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Research Seminar – Malcolm Barnard

November 30, 2020 @ 12:00 pm - 1:00 pm

photo of UNC Marine Sciences graduate student Malcolm BarnardThe UNC-CH Department of Marine Sciences presents a research seminar from graduate student, Malcolm Barnard. This event will be held on Monday, November 30th, at 12:00 pm. However, this seminar is remote only and can be viewed online via Zoom (Meeting ID: 974 6573 2747).

Seminar Title: Adapting Oceanic Grazing Techniques for use in High Productivity Systems

Abstract: Grazing of phytoplankton by heterotrophic bacteria and zooplankton plays a crucial in carbon and nutrient cycling dynamics along the freshwater-marine continuum. While oceanic grazing rates are well studied, grazing rates in freshwater and estuarine systems are much less characterized. Additionally, different methodologies are utilized across the freshwater-marine continuum for measuring grazing rates, leading to comparative issues between measured grazing rates. I investigated the use of major ion solutions (MIS) instead of filtered site water as the diluent for use in the oceanographic Landry-Hassett dilution grazing bioassay methodology on order to develop a common grazing method across the freshwater-marine continuum by running paired dilution grazing experiments in lake, river, estuarine (tidal and lagoonal), and oceanic shelf systems. As MIS doesn’t include vitamins that would be in filtered water, vitamin effects on grazing rate determination were also investigated. Results show that this revised grazing method can be applied across the freshwater-marine continuum.


November 30, 2020
12:00 pm - 1:00 pm
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