1. Dep. of GeographyPennsylvania State Univ. University Park PA 16802, USA
2. Current address: Fruit Research and Extension CenterPennsylvania State Univ. Biglerville PA 17307, USA
3. USDA‐ARS Pasture Systems & Watershed Management Research Unit State College PA 16802, USA
4. Agricultural, Food & Resource SciencesUniv. of Maryland Eastern Shore Princess Anne MD 21853, USA
5. ClearWater Conservancy 2555 North Atherton St. State College PA 16803, USA