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<p>Today's speaker in the EOAS Colloquium at 3:30 pm will be<br>
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<p><font size="+2">Dr. Kim Popendorf </font>of the University of
Miami</p>
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<p class="MsoNormal"><font size="+2">Microbial Efficiency:<span style="mso-spacerun:yes"> </span>New ways to look at how
microbes move energy and material through the ocean</font></p>
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<p class="MsoNormal">Marine microbes are responsible for large,
critical fluxes of material on a global scale—playing a central
role in maintaining the ocean as a global carbon sink, and
generating half of the oxygen in the atmosphere on an annual
basis.<span style="mso-spacerun:yes"> </span>The magnitude and
fate of the ocean as a carbon sink is dependent on the
efficiency of microbial processes: of the carbon that microbes
consume, how much is transformed into biomass that can be passed
up the food chain or exported from the water column, versus
carbon that is respired and can ultimately return to the
atmosphere?<span style="mso-spacerun:yes"> </span>Our lab has
developed and deployed new methods for measuring the production
rates of marine microbes, particularly heterotrophic bacteria,
and for measuring the rates of energy use (respiration) in
diverse microbes.<span style="mso-spacerun:yes"> </span>Using
membrane phosphoplipid turnover rates to measure bacterial
production rates across the Atlantic and Pacific we demonstrate
that heterotrophic bacteria may be growing at much faster rates
than the standard paradigm, indicating that the microbial loop
may be recycling material more rapidly than previously assumed.<span style="mso-spacerun:yes"> </span>Combining this with a new
way to measure the rates of energy utilization in marine
microbes—by measuring the turnover rate of adenosine
triphosphate (ATP) in cells—we can investigate variations
microbial efficiency across diverse environments.<span style="mso-spacerun:yes"> </span>By measuring microbial ATP
concentrations across the South Pacific and comparing to other
measures of biomass, community composition, and nutrient
resources we provide new insights on microbial metabolic
strategies that may underlie variations in microbial efficiency
in the ocean.</p>
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<p class="MsoNormal">Via Zoom:</p>
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<p class="MsoNormal"><font size="+2"><a target="_blank" style="word-wrap: break-word;" href="https://fsu.zoom.us/j/96084968234" moz-do-not-send="true">https://fsu.zoom.us/j/96084968234</a></font></p>
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<p class="MsoNormal">Please contact Dr Angie Knapp if you would
like to meet with the speaker.</p>
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