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Efficacy of Vegetated Buffer Strips for Retaining Cryptosporidium parvum

^a Department of Agronomy and Range Science, One Shields Avenue, University of California, Davis, CA 95616-8515
^b Veterinary Medicine Teaching and Research Center, School of Veterinary Medicine, University of California, 18830 Road 112, Tulare, CA 93274

View larger version (19K): [in a new window]   Fig. 1. Mean Cryptosporidium parvum oocyst concentration breakthrough curves in overland flow from 0.5-m-wide x 1.1-m-long x 0.3-m-deep soil boxes set to three land slope treatments, planted with grass, filled with a sandy loam soil, spiked with 200 g of cattle fecal deposit with 2 x 108 oocysts, and subject to simulated rainfall intensities of 30 to 47.5 mm/h for 2 h.

View larger version (14K): [in a new window]   Fig. 2. Mean Cryptosporidium parvum oocyst flux (concentration x flow) breakthrough curves in overland flow from 0.5-m-wide x 1.1-m-long x 0.3-m-deep soil boxes set to three land slope treatments, planted with grass, filled with a sandy loam soil, spiked with 200 g of cattle fecal deposit with 2 x 108 oocysts, and subject to simulated rainfall intensities of 30 to 47.5 mm/h for 2 h.

View larger version (17K): [in a new window]   Fig. 3. Mean Cryptosporidium parvum oocyst concentration breakthrough curves in subsurface flow from 0.5-m-wide x 1.1-m-long x 0.3-m-deep soil boxes set to three land slope treatments, planted with grass, filled with a sandy loam soil, spiked with 200 g of cattle fecal deposit with 2 x 108 oocysts, and subject to simulated rainfall intensities of 30 to 47.5 mm/h for 2 h.

View larger version (13K): [in a new window]   Fig. 4. Mean Cryptosporidium parvum oocyst flux (concentration x flow) breakthrough curves in subsurface flow from 0.5-m-wide x 1.1-m-long x 0.3-m-deep soil boxes set to three land slope treatments, planted with grass, filled with a sandy loam soil, spiked with 200 g of cattle fecal deposit with 2 x 108 oocysts, and subject to simulated rainfall intensities of 30 to 47.5 mm/h for 2 h.

View larger version (16K): [in a new window]   Fig. 5. Graphical display of a negative binomial regression model quantifying the effect of land slope and precipitation rate on the total Cryptosporidium parvum oocyst flux, and thus log10 reduction, of oocysts per meter of vegetated buffer with 95% grass cover, sandy loam soil, and C. parvum application in a cattle 200-g fecal deposit spiked with 2 x 108 oocysts.