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Microbial community composition alters response of litter decomposition to global change. Kristin Matulich J. Martiny Lab May 17th, 2012 Central Questions 1. Does microbial community composition shift in response to global change? Environment 2. Do microbial communities have differential responses? Microbe 3. Microbe Decomposition Can community responses be predicted? Individual Community Background ¨ ¨ ¨ ¨ Current global change models don’t include microbial parameters. Microbes perform key nutrient and energy transformations in ecosystems. Microbes might be key to improving predictions. What role does microbial community composition play in litter decomposition, and how does that role change under environmental perturbations? Central Questions 1. Does microbial community composition have an effect on litter decomposition rates? 2. Does the response of litter decomposition to environmental perturbations depend on microbial community composition? 3. Does the importance of interactions between microbial community composition and environmental perturbation vary with type of environmental perturbation? Culturing Bacteriodetes (6) Actinobacteria (18) Alphaproteobacteria (5) Betaproteobacteria (3) Gammaproteobacteria (3) Culturing Fungi: 24 unique “species” Bacteria: 32 unique “species” Laboratory Experiment X Laboratory Experiment Results Results a b c b Results (Entire Data) Results: Entire Data Results: Days 1-30 Results: Days 1-30 Results: Days 31-60 Results: Days 31-60 Loma Ridge Field Experiment X Field Experiment Acknowledgments Jennifer Martiny Claudia Weihe Anthony Amend Steven Nguyen Steven Allison Diane Campbell