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5/24/2018 | 2:15 PM - 2:30 PM | SHORT TERM BIOLOGICAL AND PHYSICOCHEMICAL EFFECTS OF PATCH-BURN GRAZING ON REMNANT TALLGRASS PRAIRIE STREAMS | 410 B

SHORT TERM BIOLOGICAL AND PHYSICOCHEMICAL EFFECTS OF PATCH-BURN GRAZING ON REMNANT TALLGRASS PRAIRIE STREAMS

North American tallgrass prairies are diminished and degraded in North America, but management practices to conserve remaining parcels are evolving. Patch-burn grazing (PBG) has emerged as a management option for remaining tallgrass prairie parcels, but little is known about potential impacts on aquatic habitats. Six headwater streams were sampled over seven years encompassing pre-PBG, PBG, and post-PBG periods; two controls, two PBG with fenced riparian zones, and two PBG with unfenced riparian zones. Macroinvertebrates and water chemistry were sampled monthly. Differences in total phosphorus and nitrate were observed in the unfenced and fenced streams during PBG compared to controls (p < 0.0001 and p < 0.02, respectively). Relative Chironomidae biomass and abundance increased in the unfenced watersheds compared to the controls during the pre-cattle to cattle period (p = 0.008 and p < 0.001, respectively). No differences were observed in EPT abundance or biomass, nitrate, and total phosphorus from pre-PBG to post-PBG. Results suggest that PBG has short term negative effects on prairie streams, but a two year rest cycle allows for the streams to return to pre-PBG conditions.

Disturbance
Intermittent
Watershed

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Presenters/Authors

Jessica Fulgoni (), Missouri Department of Conservation, jessica.Fulgoni@mdc.mo.gov;