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Journal of Environmental Quality Abstract - Landscape and Watershed Processes

Patch-Burn Grazing Effects on the Ecological Integrity of Tallgrass Prairie Streams

 

This article in JEQ

  1. Vol. 44 No. 4, p. 1148-1159
     
    Received: Oct 22, 2014
    Accepted: May 04, 2015
    Published: July 10, 2015


    * Corresponding author(s): kjackson@siu.edu
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doi:10.2134/jeq2014.10.0437
  1. Karen E. Jackson *a,
  2. Matt R. Whilesb,
  3. Walter K. Doddsd,
  4. John D. Reeveb,
  5. Jodi M. Vandermydee and
  6. Heidi M. Rantalac
  1. a P.O. Box 102406, Columbia, SC 29224
    b Dept. of Zoology and Center for Ecology, Southern Illinois University, Carbondale, IL 62901
    d Division of Biology, Kansas State University, Manhattan, KS 66506
    e Illinois Natural History Survey, One Natural Resources Way, Springfield, IL 62702
    c Division of Fish & Wildlife, MN Dept. of Natural Resources, 500 Lafayette Road, St. Paul, MN 55155

Abstract

Conversion to agriculture, habitat fragmentation, and the loss of native grazers have made tallgrass prairie one of the most endangered ecosystems. One management option for the remaining prairie parcels, patch-burn grazing (PBG), applies a controlled burn to a portion of the prairie to attract cattle, creating a mosaic of more- and less-grazed patches. Although beneficial to cattle and grassland birds, the potential impacts of PBG on streams have not been studied, and a holistic approach is needed to ensure against adverse effects. We used a Before-After-Control-Impact design to assess potential impacts of PBG with and without riparian protection on tallgrass prairie headwater streams. We sampled stream macroinvertebrates and benthic organic matter 2 yr before and 2 yr during PBG treatments on two grazed watersheds with riparian fencing (fenced), two unfenced grazed watersheds (unfenced), and two ungrazed (control) watersheds. Very fine benthic organic matter increased significantly (51%) in unfenced streams compared with controls (p < 0.007), and fine particulate organic matter (<1 mm and >250 µm) increased 3-fold in the unfenced streams compared with controls (p = 0.008). The contribution of fine inorganic sediments to total substrata increased 28% in unfenced streams during PBG, which was significantly different from controls (p = 0.03). Additionally, the abundance of Ephemeroptera, Plecoptera, and Trichoptera taxa decreased from 7635 to 687 individuals m−2 in unfenced streams, which was significantly lower than in control streams (p = 0.008). Our results indicate that PBG adversely influences prairie streams through sediment inputs and reductions in sensitive invertebrate taxa, but riparian fencing can alleviate these impacts.

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