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X-WR-CALNAME;VALUE=TEXT:UMCES Events
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DTSTART:20191103T020000
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DTSTART:20200308T020000
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UID:calendar.4800.field_date_time.0@www.umces.edu
DTSTAMP:20260403T210818Z
CREATED:20190930T154154Z
DESCRIPTION:December 18\, 2019 10:00am to 11:00am    \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			\n			\n\nTitle: The enteric microbiome of a novel wood-digest
 ing organism: diversity of lignocellulolytic and nitrogen fixing communiti
 es of the Amazonian catfish\, Panaque nigrolineatus\n\n			\n\nAbstract: The N
 eotropical catfish Panaque nigrolineatus imbibes large quantities of wood 
 as part of its diet. This is an unusual feeding strategy among vertebrates
  as it imposes many dietary challenges.  The most notable of these is the 
 lack of assimilable carbon and nitrogen compounds.  To overcome these diet
 ary limitations\, wood-feeding organisms rely on the lignocellulytic and d
 iazotrophic activities of their enteric microbiomes.  Characterization of 
 the microbiomes of P. nigrolineatus through culture-dependent and molecula
 r methods identified bacterial and fungal communities that were taxonomica
 lly distinct from all other wood-feeding organisms. Analysis of GI tract c
 ommunities generated from anaerobic microcrystalline cellulose enrichment 
 cultures and DNA stable-isotope probing approaches by 16S rRNA gene analys
 is revealed phylotypes sharing high sequence similarity to known celluloly
 tic bacteria including Clostridium\, Cellulomonas\, Bacteroides\, Eubacter
 ium and Aeromonas spp.  Similar characterizations of the nitrogen-fixing c
 ommunity through enrichment culturing and community nifH sequencing reveal
 ed phylotypes that are closely related to Clostridium sp.\, Alpha and Gamm
 aproteobacteria\, and sequences associated with GI tracts of lower termite
 s.  In addition to the observed bacterial diversity\, P. nigrolineatus als
 o possess a resident cellulolytic fungal community comprised of Sordariomy
 cetes and Dothideomycetes.  Despite this unusual assemblage of microorgani
 sms\, the functional capacity of these communities is consistent with thos
 e observed in other wood-feeders.  Manipulating enteric communities throug
 h diet revealed a high degree of taxonomic diversity but high functional r
 esiliency.  The microbiomes of both wood-fed and mixed diet-fed fish had h
 igh capacity for hemicellulose hydrolysis as the predicted metagenomes con
 tained several classes of hemicellulases and lignin-modifying enzymes. How
 ever\, communities from both diets appeared to lack the necessary cellobio
 hydrolases for efficient cellulose hydrolysis\, suggesting that cellobiose
  is not the primary source of dietary carbon for the fish.  Meta-analysis 
 exploring the microbiomes of diverse wood-feeding and non-feeding animals 
 suggest that the P. nigrolineatus gut environment selects for an enteric c
 ommunity based on function\, rather than relying on vertically transferred
  symbiotic relationships. This is an unusual method of community assembly 
 in wood feeding-organisms but may provide an advantage to organisms\, like
  P. nigrolineatus\, that switch between dietary strategies to survive in h
 ighly variable environments. \n\n			\n\nSpeaker: Ryan McDonald (Graduate Stud
 ent\, UMBC-IMET)\n\n			\n\nHost: Dr. Hal Schreier
DTSTART;TZID=America/New_York:20191218T100000
DTEND;TZID=America/New_York:20191218T110000
LAST-MODIFIED:20191211T140827Z
SUMMARY:IMET Dissertation Defense: Ryan McDonald (Graduate Student\, UMBC-I
 MET)
URL;TYPE=URI:https://www.umces.edu/events/imet-dissertation-defense-ryan-mc
 donald-graduate-student-umbc-imet
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