Bobcats in Westchester County
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Michael Rubbo, Ph.D. Department of Environmental Studies and Science Pace University 50 mi N of NYC Population of ~ 1 million . 44th most populated county in US 450 mi2 . 290,000 acres Significant open space . Over 100,ooo acres ▪ ~50% forested Approximately 9,500 acres Located in: . Towns of Ossining, Mount Pleasant, New Castle . Villages of Briarcliff Manor, Sleepy Hollow, Pleasantville Pocantico River originates in Echo Lake and ends at Hudson River . Flows north to south . Approximately 9.5 miles in length Sources: Esri, HERE, DeLorme, Intermap, increment P Corp., GEBCO, USGS, FAO, NPS, NRCAN, GeoBase, IGN, Kadaster NL, Ordnance Survey, Esri Japan, METI, Esri China (Hong Kong), swisstopo, MapmyIndia, © OpenStreetMap contributors, and the GIS User Community Public . Rockefeller Park and Preserve – Over 1,700 acres . Hardscrabble Wilderness Area - ~250 acres . Pocantico Lake County Park - ~165 acres Private – open to the public . Stone Barns Center for Food and Agriculture Private . Edith Macy Conference Center - ~400 acres . Campfire Club - ~225 acres Identify unique ecological attributes or areas that are impaired . Will direct preservation/restoration efforts . Serve as basis for watershed management plan First step is to locate resources . Habitats are a good representation of overall biological resources Collected common data layers: . Roads . Municipal tax parcels . Topographic contours . Bedrock geology . Surficial geology . Soils . Hydrography . DEC streams . FEMA floodplains . Department of Environmental Conservation (DEC) wetlands . National Wetlands Inventory (NWI) wetlands . NY Natural Heritage Program (NYNHP) data . Agricultural land Standard hydrography and wetlands data sets Also used soil properties for wetlands . Used soils classes of: ▪ Somewhat Poorly Drained ▪ Poorly Drained ▪ Very Poorly Drained Crest, Ledge, and Talus . Shallow soils – < 20 inches . Steep slopes (> 12 %) Calcareous Soils . Selected soil types identified as calcareous or somewhat calcareous from Table 17 of Biodiversity Assessment Manual Used method developed by Hudsonia . Biodiversity Assessment Manual for the Hudson River Estuary Corridor Habitat types defined by vegetation Identified using Aerial Photograph Interpretation . Google Earth Created polygons for habitat types Identified 59 points in need of field verification Downloaded points onto GPS units Any previously unidentified habitats were located with GPS and added to map Upland Habitats 8,705.4 92.0% Hardwood forest 2,839.1 30.0% Mixed forest 84.9 0.9% Coniferous forest 13.5 0.1% Shrubland 171.0 1.8% Meadow 554.7 5.9% Cultural 377.5 4.0% Waste ground 41.6 0.4% Developed 4,623.1 48.8% Crest, ledge, talus N/A Wetland Habitats 761.1 8.0% Pocantico River and streams N/A - 70.4 miles N/A Tidal tributary mouth* 7.7 0.08% Tidal marsh 6.4 0.07% Tidal swamp 0.8 0.01% Nontidal marsh 113.7 1.2% Hardwood swamp 470.5 5.0% Wet meadow 9.7 0.1% Lakes and ponds 152.3 1.6% Intermittent woodland pool 2.5 (not included in total acreage)^ 0.03% Ecologically unique areas of the watershed that should be protected Defined by: . Large blocks of intact habitat . Unique habitats . Exceptional example of specific habitats . Potential wildlife corridors Identified three PCAs: . Northern PCA ▪ Macy Center, Hardscrabble Wilderness Area, Campfire Club . Southern PCA ▪ Rockefeller, Stone Barns, Pocantico Lake . Pocantico River and riparian area ▪ 100ft buffer on each side of River Goal was to identify specific species in PRW . Focus on large mammals using wildlife cameras Study period January – April Cameras set for 2 weeks . ~15 cameras/2 week period Baited with lure Created a fishnet of 1km2 blocks Added only forested habitats Divided watershed into 3 areas of similar size 1 . Area 1 – 3,074 acres . Area 2 – 3,394 acres 2 . Area 3 – 2,992 acres 3 Used habitat mapping data to 1-4 1-26 1-21 locate forest patches > 5 1-14 1-13 1-8 acres in size 1-20 1-19 1-10 1-15 1-9 Used Create Random Points 1-25 1-24 to locate cameras 2-22 2-21 . Minimum of 500 meters apart 1-23 2-13 2-1 2-15 2-17 Final camera #’s: 2-16 2-14 . 2-3 Area 1 = 14 2-5 ▪ 980 acres forest 2-12 2-7 2-10 ▪ 0.014 cameras/acre of forest 2-9 3-1 . Area 2 = 14 3-6 3-7 3-10 3-8 ▪ 910 acres forest 3-12 3-4 3-11 ▪ 0.015 cameras/acre of forest 3-9 3-18 3-17 3-20 3-21 . Area 3 = 21 3-19 3-16 3-25 3-14 ▪ 1190 acres forest 3-27 3-22 3-26 ▪ 0.018 cameras/acre of forest 3-24 Green = High Species richness was (6 species) Yellow = highest in Area 1 Medium (north) (4-5 species) Red = Low (2-3 species) Coyote Presence (green) or Absence (red) Area 1>Area 2>Area 3 (Slight trend) Bobcat Presence (green) or Absence (red) Area 1>Area 2=Area 3 (Stronger trend) White-tailed Deer Eastern Coyote Continue to develop our understanding of the ecological condition of the PRW . Identify wildlife corridors . Additional water quality studies to identify potential sources of pollution ▪ Nutrients . Riparian area assessment ▪ Vegetation, erosion, point sources Use this info to begin to work on a watershed management plan . Focus on the mitigation of impacts to watershed and river Field Assistants . Hillary Seiner, Angelica Arocho, Morgan Kelly Landowners . Local Municipalities: Town of Ossining, Mt. Pleasant, Briarcliff Manor, Sleepy Hollow, Town of New Castle . Government: Westchester County, State of NY . Private: Girl Scouts, Campfire Club, Bethany Arts Community, Sleepy Hollow Country Club This Project has been funded in part by a grant from the New York State Environmental Protection Fund through the Hudson River Estuary Program of the New York State Department of Environmental Conservation..