Virginia Collier Kevin Davis Katelyn Hollingsworth Marion Juren
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Transcript of Virginia Collier Kevin Davis Katelyn Hollingsworth Marion Juren
Life and Death of Deep Sea Vents: Bacterial Diversity and Ecosystem Succession on
Inactive Hydrothermal SulfidesVirginia Collier
Kevin DavisKatelyn Hollingsworth
Marion Juren
What is a hydrothermal sulfide?There are both active and inactive sulfides.
Active sulfide:A superheated underwater geyser
Inactive sulfide:The structure that remains after venting is
ceased
Purpose of the ExperimentExploration of the Microbiology of Inactive
Hydrothermal SulfidesTo further study ecological succession on
hydrothermal sulfidesUse tag pyrosequencing to assess bacterial
diversity associated with inactive sulfide chimneys using samples from 9°N on the East Pacific Rise
(Sylvan et al.)
Ecological SuccessionLife on an Active Hydrothermal Sulfide
Life on an Inactive Hydrothermal Sulfide
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Ecological Succession
Sylvan J B et al. mBio 2012; doi:10.1128/mBio.00279-11
• Disturbance shifts species diversity on a macro and micro scale (Shank et al.)
• Rare biospheres succeed majority populations on inactive chimneys• Environmentally
favorable (Sylvan et al.)
Diversity• Simpson’s Index
for inactive sites is between 1.6 and 23.7• Active sites are
between 8.3 and 21.8 (Freeman, Sylvan et al.)
• Not all sample sites are comprised of the same populations or proportions
Sylvan J B et al. mBio 2012; doi:10.1128/mBio.00279-11
Phylogenetic Tree of Predominant Bacteria on Inactive Sulfides
Sylvan J B et al. mBio 2012; doi:10.1128/mBio.00279-11
ResultsEcological seccession causes population
magnitudes to be inverted on inactive sulfides
Diversity is not uniform across sample sitesDifferent sites have different seccessionary
pathways
(Sylvan et al.)
In Conclusion…
Inactive sulfides are an example of secondary succession and are
low-diversity environments compared to other deep-sea
ecosystems.
ReferencesFreeman, Scott. Biological Science. San Fransicso, CA:
Benjamin Cummings, 2011. Print.Shank, T., D. Fornari, K. Vondamm, M. Lilley, R. Haymon, and
R. Lutz. "Temporal and Spatial Patterns of Biological Community Development at Nascent Deep-sea Hydrothermal Vents (9°50′N, East Pacific Rise)." Deep Sea Research Part II: Topical Studies in Oceanography 45.1-3 (1998): 465-515.
Sylvan, Jason M., Brandy M. Toner, and Katrina J. Edwards. "Life and Death of Deep-Sea Vents: Bacterial Diversity and Ecosystem Succession on Inactive Hydrothermal Sulfides." MBio 3 (2012): n. pag. American Society for Microbiology, 24 Jan. 2012. Web. Sept. 2012.