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|All Authors / Contributors:||Michael J Adams; Christopher A Pearl; Brome McCreary; Stephanie K Galvan; Stephanie J Wessell; Wendy H Wente; Chauncey W Anderson; Allison B Kuehl|
|Notes:||Fig. 1. Map showing location of ponds used to study the effects of grazing exclosures on Rana luteiventris populations in northeastern Oregon (2002-2006). Numbers designate block membership.
Fig. 2. Responses of Rana luteiventris and habitat to grazing exclosures in northeastern Oregon (2002-2006): (A) height of shoreline vegetation; (B) egg mass counts; (C) larval survival; and (D) size at metamorphosis.
Livestock grazing is a common land use across the western United States, but concerns have been raised regarding its potential to affect amphibian populations. We studied the short-term effects of full and partial livestock grazing exclosures on Rana luteiventris (Columbia Spotted Frog) populations using a controlled manipulative field experiment with pre- and posttreatment data (2002-2006). Despite a significant increase in vegetation height within grazing exclosures, we did not find treatment effects for egg mass counts, larval survival, or size at metamorphosis 1-2 years following grazing exclosure installation. Water samples taken in late summer showed concentrations of nitrite, nitrate, ammonia, and orthophosphate that were low or near detection limits across all ponds and years. The results of this experiment do not support a hypothesis that limiting cattle access to breeding ponds will help conserve R. luteiventris populations in our study area. Further research is needed to evaluate regional variation and long-term effects of grazing exclosures on R. luteiventris populations.