20050926 PDT Net

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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

• final theoretical structural equation model= interactions among:
• climate
• soils
• initial community conditions (ANPP, SR, Comp)
• ANPP Increase
• Functional Group Turnover
• Treatment conditions

• 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