anchor.diff:  54, host-parasite interactions
   55, extinction in the fossil record
   56, species co-occurrence patterns?
  -57, \"environment\" [remove?]
  +57, ""environment"" [remove?]
   58, anthropogenic change
   59, decomposition and nutrient cycling
  -60, \"rivers, erosion, and nutrient flows\"
  +60, ""rivers, erosion, and nutrient flows""
   61, valuing nature
   62, marine ecology
   63, biogeography and urban ecology??
  
positive.code: 1, data structure and metadata
  2, conservation
  3, phenology and climate
  
negative.code: 75, disturbance
  76, diversity estimation (and stuff?)
  77, remove??
  78, ""movement, foraging, and migration""
  79, nitrogen
  80, invasions
  81, remote sensing
  