Forests, fungi, and small mammals: the impact of fire and forest thinning on truffle production and consumption Marc Meyer and Malcolm North USFS PSW Research.

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Presentation transcript:

Forests, fungi, and small mammals: the impact of fire and forest thinning on truffle production and consumption Marc Meyer and Malcolm North USFS PSW Research Station Sierra Nevada Research Center Davis, California Douglas Kelt Department of Wildlife, Fish, & Conservation Biology University of California, Davis

?

Study Questions: n What effect does burning and mechanical thinning have on the forest ecosystem?

Study Questions:

ectomycorrhizal fungi small mammals fruiting bodies (truffles) provide a major food source

ectomycorrhizal fungi small mammals fruiting bodies (truffles) provide a major food source dispersal of fungal spores

ectomycorrhizal fungi small mammals fruiting bodies (truffles) provide a major food source dispersal of fungal spores forest trees

Teakettle Experimental Forest

Experimental forest boundary Stream Teakettle Experimental Forest

200 m 18 plots total Plots 4 ha in area Plots represent replicate stands

Teakettle Experimental Design (n = 3 per treatment; 6 treatments total) No BurnBurn No Thin Light Thin (understory) Heavy Thin (overstory) light thin onlylight thin & burn heavy thin onlyheavy thin & burn control burn only

Truffle sampling ( ): n 9 grid points per plot in 3 x 3 grid (50 m spacing, 50 m buffer) n truffle sampling (4 m 2 plots) at all grid points m 2 per plot per season n 2 seasons of sampling for 2 years n Frequency, species richness, and biomass of truffles

Truffle consumption n Lodgepole chipmunks (Tamias speciosus) sampled June-August at truffle grid points n microhistological analysis of chipmunk diets u frequency of truffle consumption u generic richness of truffles in diet

Truffles

MANOVA results for effect of thinning & burning on truffle production Dependent variable FactorFdfP MANOVABurn Thin B × T ,22 6,

Truffle consumption

MANOVA results for effect of burning & thinning on truffle consumption Dependent variable FactorFdfP MANOVABurn Thin B × T ,21 4,42 2,

MANOVA comparisons in burned + thinned vs. burned only Dependent variableFdfP Truffle production Truffle consumption ,22 2,

Conclusions: n Significant reduction in truffle production & consumption following burning or thinning

Conclusions:

Management implications: n Current forest management policy in the Sierra Nevada (i.e. Sierra Nevada Forest Plan Amendment 2001) uses combined thin & burn treatments for fuel reduction

Management implications: n Current forest management policy in the Sierra Nevada (i.e. Sierra Nevada Forest Plan Amendment 2001) uses combined thin & burn treatments for fuel reduction u These combined treatments have a substantial impact on truffle production & consumption

Management implications:

Acknowledgments n n USFS PSW Research Lab n n USFS Forest Health Technology Enterprise Grant, Joint Fire Science Program Grant, NIGMS IMSD Fellowship, UC Graduate Opportunity Fellowships n n Sarah Reed, Blake Meneken, Jamie Burke, Kerry Byrne