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TZUNTIL:20051030T010000Z
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DTSTART:20031026T030000
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UID:www.bayceer.uni-bayreuth.de-bayceer-t53264id
DTSTAMP:20260817T091248Z
DESCRIPTION:Saltmarshes are among the most productive ecosystems on earth. 
  These \nwetlands are vital components of coastal marine ecosystems\, beca
 use the \nprovide important nursery grounds for fish and they limit \nnutr
 ient-exchange at the land-sea boundary.  My research group focuses \non qu
 antifying the structure and function of microbial communities \ncatalyzing
  key C and N cycling reactions across geochemical gradients. \nWe also rel
 ate the ecosystem-level ecology of macrobenthos to the \nrates/ pathways o
 f C and N transformations mediated by microorganisms. \nOur results have d
 emonstrated the importance of microbial iron \nrespiration to organic matt
 er decomposition in saltmarsh sediments\, and \nGeographical Information S
 ystems (GIS) were utilized to expand \nestimates of nutrient flow to entir
 e saltmarsh basins over the \nkilometer scale.   We provide the first deta
 iled enumeration and \nidentification of iron-reducing bacteria in marine 
 sediments using a \ncombination of culture-based and molecular techniques.
   We observed \nthat a rapid iron cycle\, facilitated by microbial iron re
 duction and \nbioturbation\, prevents the poisoning of microbially-mediate
 d nitrogen \ntransformations (nitrification\, denitrification) by dissolve
 d sulfide.  \nThis new linkage between the nitrogen and iron cycles has be
 en explored \nin the field and in laboratory incubations.  My seminar will
  present a \nsynopsis of the above recent discoveries at the interface of 
 biology \nand geochemistry.
DTSTART;TZID=Europe/Berlin:20031113T161500
DTEND;TZID=Europe/Berlin:20031113T235959
LOCATION:H6
SUMMARY:Prof. Joel E. Kostka\, Department of Oceanography\, Florida State U
 niversity: Microbial biogeochemistry in saltmarsh sediments of the southea
 stern U.S.A
TRANSP:TRANSPARENT
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