Moore Notes 3 30 11

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Group Call

  • JG will contact Michael Fischbach about chemical question
  • JG traveling next Weds, but generally around this quarter
  • Niche mapping paper
    • Make introduction more focused on need for paper (i.e., why global range maps are important and haven't been done yet), rather than results or mechanisms underlying diversity
      • Say that range is the fundamental unit of biogeography
      • Have been elusive for microbes, and why
      • Why this is a problem
      • We solve the problem
      • Emphasize impact of microbe ranges on biogeochemistry/ecosystem services
    • Maybe we should hedge or Rapoport's rule?
      • Steve: classically ranges span 7 orders of magnitude, but we look at a few degrees of latitude
      • Have to address the fact that we drop all taxa with small ranges
      • Usual explanation is mechanistic and relates to variability of environment (there is more at poles in ocean, but it is damped vs. land)
      • KP: report result, but clarify that can't really test Rapoport's Rule with common taxa only
    • Can we say something about which predictors are selected across genera?
      • Temperature is most common, but most others are commonly used also - not a lot of variation
      • Need to highlight why microbes like the arctic (reference Furman paper about temperature)
      • Some phyla respond to other things, like cyanobacteria which respond to sunlight and are maximal at tropics
    • Tom: oceanographic/environmental trends that might relate to our diversity results
      • Polar peaks
        • Cold water is higher in gaseous content (e.g., dissolved O2)
        • More upwelling/mixing in polar oceans
      • Asymmetry of hemispheres
        • Less land runoff in antarctic vs. arctic (affects salinity)
        • Phosphate concentration higher in Southern Ocean
      • JG: How do these results relate to rank abundance curves?
    • James: Genus area relationship (GAR)
      • GAR depends on sampling depth (totally flat if you turn it up to infinite sampling)
      • At genus level ranges are very large
      • KP: what about an estimate of what GAR looks like at the currently available data sampling depth and distribution
        • James: we're close to a flat GAR already
      • Josh: Fits in with other diversity results and how they change through space
      • James: Would be better to do at species level (e.g., with PhylOTU)
    • Alex's phylum level diversity plots will be integrated in next week
      • Richness
      • Shannon diversity
    • Web portal for data and maps
    • Josh will send revised draft this weekend, followed by another round of edits by all