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  • Initial goals
    • explain variation in species loss with nitrogen addition (proportional richness decline)
    • 25% mean loss, 5-60% range in loss
    • function of climate/environment?
      • N mineralization
      • pH
      • water content
...many others
=reported mean from each site
  • final theoretical structural equation model= interactions among:
    • climate
    • soils
    • initial community conditions (ANPP, SR, Comp)
    • ANPP Increase
    • Functional Group Turnover
    • Treatment conditions

probably best to start with multiple regression tools

  • Possible analyses using the already-integrated dataset
    • Homogenization question: Does nitrogen addition result in a more homogenized community?
      • Mechanisms: 1) rare species dropping out or 2) rare species becoming more common
    • Time series question
    • Rank abundance curves comparing different treatments
      • one use: define what the rare species are


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This page last changed on 26-Sep-2005 11:48:01 PDT by LTER.dpennington.


This material is based upon work supported by the National Science Foundation under award 0225676. Any opinions, findings and conclusions or recomendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation (NSF).

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Long Term Ecological Research Network, UNM National Center for Ecological Analysis and Synthesis, UCSB Biodiversity Research Center, KU San Diego Supercomputer Center, UCSD
 
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