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    Siderophore production by heterotrophic bacterial isolates from the Costa Rica Upwelling Dome

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    Krey_thesis.pdf (2.036Mb)
    Date
    2008-06
    Author
    Krey, Whitney B.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/2394
    Location
    Costa Rica Dome
    DOI
    10.1575/1912/2394
    Keyword
     Siderophores; Heterotrophic bacteria; Knorr (Ship : 1970-) Cruise KN182-50 
    Abstract
    An increased understanding of heterotrophic bacterial strategies for acquiring nutrients and trace elements is critical for elucidating their impact on biogeochemical cycling in the ocean. It is estimated that iron is a limiting nutrient for phytoplankton growth in over 30% of the open ocean, but still little is known about bacterial strategies for iron acquisition. Siderophore (Fe ligand) production by bacteria may play a major role in influencing the bioavailability of iron in the ocean. Despite the importance of siderophores in the environment, only limited information from a select group of bacteria is available. On a cruise through the Costa Rica Dome (CRD) upwelling region in July 2005, a library of 867 isolates from five depth profiles inside and outside of the dome was obtained and screened for siderophore production using the Chrome Azurol-S (CAS) assay. Phylogenetic affiliation of 134 isolates was determined by sequencing the 16s rDNA gene, and determined that gamma proteobacteria such as Alteromonas, Pseudoalteromonas, Halomonas, and Marinobacter dominated the collection, while alpha-proteobacteria such as Roseobacter were also represented. The isolates obtained from stations in the CRD showed greater siderophore-producing capabilities between 55m and 100m while strains isolated from outside the CRD had shallower peak (~8-35m) production. Functional group determination showed that hydroxamate production dominated from 50-150m, while hydroxamate and catechol production is roughly equal in shallower waters. By characterizing the siderophores produced by these isolates and determining the genetic make-up of the population, these findings further our understanding of how heterotrophic microbes affect biogeochemical processes and the competitive nature of nutrient acquisition.
    Description
    Submitted in partial fulfillment of the requirements for the degree of Master of Science at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June 2008.
    Collections
    • WHOI Theses
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Thesis: Krey, Whitney B., "Siderophore production by heterotrophic bacterial isolates from the Costa Rica Upwelling Dome", 2008-06, DOI:10.1575/1912/2394, https://hdl.handle.net/1912/2394
     

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