Sagehen Biotic Communities Respond to Human Disturbances

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Haleigh

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Haleigh Climate drier Catastrophic fire Management and burn pile effect unkown

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Within sagehen

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We predicted species richness would vary by managed or unmanaged plots, as a result of the fact that species have respond to anthropogenic disturbances in the forest.

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We chose 3 separate sites each including a managed and unmanaged 30m x 30m plot to research. Plant richness, Mule’s Ear presence, canopy cover Invertebrate collection through four Falcon Tubes and two Sticky Pads placed at each plot for 24-26 hours Mammal observations for two 20 minute periods in the morning at each plot

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Rebecca

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Rebecca

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Charles:, we found no effect of mgmt on invert div. HOWEVER, we did detect an effect of SITE on Invert Div.

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Charles

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Rebecca

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Human forest management at Sagehen has an effect on species richness, whether negative (insect diversity) or positive (mammal use)

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Casey

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Sagehen biotic communities respond to human disturbances By Charles Chen, Casey Kwok, Rebecca Raven, Iris Wang, and Haleigh Yang

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What is the big idea? Changing climate increases risk of forest fires. Restoring fire cycles improves forest health. Effect of human forest management on ecological communities is unknown.

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Study System 3 sites each including a managed and an unmanaged pair A B C

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Hypothesis: Expecting response to disturbances Human-induced forest management negatively effects mammal presence, invert diversity and tree cover.

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Methods:

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Results:

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Results: Mammals Mammals only found in managed sites (P < 0.01)

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Results: Invert diversity No effect of management Psite = 0.05 Pmgmt = NS Variation among sites

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Results: Management bristletails & mites Bristletails and mites were nearly absent among managed sites (P < 0.01)

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Results: Canopy coverage

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Human disturbance partially affects species richness Canopy cover Bristletails and mites Invert diversity Mammals

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What does this all mean? Forest management impacts species; Site variation is another important factor Further Study Longer Research Term Lichen, moss and decomposing plants Bird Observation Future consequences of management on species

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Thanks! Questions?

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Results: Canopy coverage invert abundance Negative correlation between invertebrate abundance and canopy coverage P = 0.02

Summary: Summer, 2018

Tags: student project

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