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X-WR-CALNAME;VALUE=TEXT:UMCES Events
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DTSTART:20181104T020000
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UID:calendar.3584.field_date_time.0@www.umces.edu
DTSTAMP:20260406T010133Z
CREATED:20190130T161243Z
DESCRIPTION:April 24\, 2019 3:00pm to 4:00pm    \n    \n      \n\n\n    \n
 \n              \nInstitute of Marine & Environmental Technology\n      \n
 \n\n\n\n  \n\n    \n\n              \n\n\n      \n  \n\n    \n\n          
     \n\n	\n		\n			Speaker: Dr. Clara Fuchsman (Assistant Professor\, UMCES-HPL)
 \n			\n			Abstract: Up to half of marine N losses from N2 production occur in ma
 rine oxygen deficient zones (ODZs). Organic matter flux from surface water
 s is thought to be a primary control on N2 production rates. While the mea
 sured offshore primary production and export rates were nearly oligotrophi
 c in the offshore Eastern Tropical North Pacific\, published rate measurem
 ents for denitrification and anammox have demonstrated ample microbial act
 ivity in the offshore portion of this ODZ. A secondary chlorophyll a maxim
 um located within the ODZ contained an actively growing cyanobacterial pop
 ulation\, as determined by metaproteomic data\, and this population produc
 ed additional organic matter within the ODZ\, some of which was transferre
 d to sinking particles. Flow cytometry revealed Prochlorococcus was the nu
 merically dominant photoautotroph at the secondary chlorophyll maximum. A 
 very high cyanophage to cyanobacteria ratio on particle-metagenomes implie
 s a role for viruses in this in situ organic matter cycling.  In samples f
 rom January 2017\, the extent of virally infected Prochlorococcus was meas
 ured using a molecular method that detects viral DNA inside individual cel
 ls. Virally infected Prochlorococcus had a maximum in the ODZ\, correspond
 ing to the maximum in Prochlorococcus cells\, with 2% of the community inf
 ected. Using elemental cell quotas for the ODZ Prochlorococcus\, we estima
 te infected cells at the secondary chlorophyll maximum contained 20 nM C. 
 If the infected portion of the Prochlorococcus population lysed every thre
 e days\, the organic matter produced would be enough to sustain 5 nM/d of 
 N2 production from denitrification. N2 production rates in the presence of
  sinking organic matter varied between 2-5 nM/d at that time. We propose t
 hat offshore N2 production is partly supported by autochthonous production
  of organic matter within the ODZ liberated by viral lysis.\n			\n			Host: Dr. H
 elen Dooley
DTSTART;TZID=America/New_York:20190424T150000
DTEND;TZID=America/New_York:20190424T160000
LAST-MODIFIED:20190417T180612Z
SUMMARY:IMET Seminar: Dr. Clara Fuchsman (Assistant Professor\, UMCES-HPL)
URL;TYPE=URI:https://www.umces.edu/events/imet-seminar-dr-clara-fuchsman-as
 sistant-professor-umces-hpl
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