Steward Grieg F.

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Steward
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Grieg F.
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  • Preprint
    Impacts of Hurricanes Katrina and Rita on the microbial landscape of the New Orleans area
    ( 2007-03-20) Sinigalliano, Christopher D. ; Gidley, M. L. ; Shibata, T. ; Whitman, D. ; Dixon, T. H. ; Laws, Edward A. ; Hou, A. ; Bachoon, D. ; Brand, Larry E. ; Amaral-Zettler, Linda A. ; Gast, Rebecca J. ; Steward, Grieg F. ; Nigro, Olivia D. ; Fujioka, Roger S. ; Betancourt, W. Q. ; Vithanage, G. ; Mathews, J. ; Fleming, Lora E. ; Solo-Gabriele, Helena M.
    Floodwaters in New Orleans from Hurricanes Katrina and Rita were observed to contain high levels of fecal indicator bacteria and microbial pathogens, generating concern about long-term impacts of these floodwaters on the sediment and water quality of the New Orleans area and Lake Pontchartrain. We show here that fecal indicator microbe concentrations in offshore waters from Lake Pontchartrain returned to prehurricane concentrations within 2 months of the flooding induced by these hurricanes. Vibrio and Legionella species within the lake were more abundant in samples collected shortly after the floodwaters had receded compared with samples taken within the subsequent 3 months; no evidence of a long-term hurricane-induced algal bloom was observed. Giardia and Cryptosporidium were detected in canal waters. Elevated levels of fecal indicator bacteria observed in sediment could not be solely attributed to impacts from floodwaters, as both flooded and nonflooded areas exhibited elevated levels of fecal indicator bacteria. Evidence from measurements of Bifidobacterium and bacterial diversity analysis suggest that the fecal indicator bacteria observed in the sediment were from human fecal sources. Epidemiologic studies are highly recommended to evaluate the human health effects of the sediments deposited by the floodwaters.
  • Article
    Draft genome sequence of marine alphaproteobacterial strain HIMB11, the first cultivated representative of a unique lineage within the Roseobacter clade possessing an unusually small genome
    (Genomic Standards Consortium, 2014) Durham, Bryndan P. ; Grote, Jana ; Whittaker, Kerry A. ; Bender, Sara J. ; Luo, Haiwei ; Grim, Sharon L. ; Brown, Julia M. ; Casey, John F. ; Dron, Antony ; Florez-Leiva, Lennis ; Krupke, Andreas ; Luria, Catherine M. ; Mine, Aric ; Nigro, Olivia D. ; Pather, Santhiska ; Talarmin, Agathe ; Wear, Emma K. ; Weber, Thomas S. ; Wilson, Jesse M. ; Church, Matthew J. ; DeLong, Edward F. ; Karl, David M. ; Steward, Grieg F. ; Eppley, John ; Kyrpides, Nikos C. ; Schuster, Stephan ; Rappe, Michael S.
    Strain HIMB11 is a planktonic marine bacterium isolated from coastal seawater in Kaneohe Bay, Oahu, Hawaii belonging to the ubiquitous and versatile Roseobacter clade of the alphaproteobacterial family Rhodobacteraceae. Here we describe the preliminary characteristics of strain HIMB11, including annotation of the draft genome sequence and comparative genomic analysis with other members of the Roseobacter lineage. The 3,098,747 bp draft genome is arranged in 34 contigs and contains 3,183 protein-coding genes and 54 RNA genes. Phylogenomic and 16S rRNA gene analyses indicate that HIMB11 represents a unique sublineage within the Roseobacter clade. Comparison with other publicly available genome sequences from members of the Roseobacter lineage reveals that strain HIMB11 has the genomic potential to utilize a wide variety of energy sources (e.g. organic matter, reduced inorganic sulfur, light, carbon monoxide), while possessing a reduced number of substrate transporters.