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Landscape-Level Patterns of Microbial Community Composition and Substrate Use in Upland Forest Ecosystems

^a School of Natural Resources & Environment, Univ. of Michigan, Ann Arbor, MI 48109
^b Center for Environmental Biotechnology, Univ. of Tennessee, Knoxville, TN 37932

View larger version (18K): [in a new window]   Fig. 1. Location of study sites in three upland forest ecosystems in Manistee and Wexford counties, northwestern Lower Michigan

View larger version (34K): [in a new window]   Fig. 2. Seasonal patterns of (A) microbial N and (B) total phospholipid fatty acid (PLFA) in three forest ecosystems in Manistee and Wexford Counties, northwestern Lower Michigan. Values given are ecosystem means; one standard error is one-half the length of each error bar

View larger version (41K): [in a new window]   Fig. 3. The mole fraction of bacterial, actinomycetal, fungal, and protozoan phospholipid fatty acids in three upland forest ecosystems in northwestern Lower Michigan. Values given are ecosystem means averaged across sampling dates. For each fatty acid, ecosystem means that have the same letter are not significantly different at = 0.05

View larger version (23K): [in a new window]   Fig. 4. Ordination of stands within each ecosystem type using microbial phospholipid fatty acids. Microbial community composition was distinct among ecosystems, evidence by the unique principal component space occupied by stands of each ecosystem type on the May, August, and October sampling dates

View larger version (23K): [in a new window]   Fig. 5. Ordination of stands within each ecosystem type using root-derived substrates on Biolog GN plates. Substrate use was distinct between the sugar maple–dominated and black oak–white oak ecosystem in May and August. In October, stands within each ecosystem type occupy unique principal components axis (PCA) space, suggesting that microbial communities in each ecosystem differ in their ability to grow on simple substrates