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270 THOMAS H. POGSON AND SUSAN M. LINDSTEDT TABLE L Numbers of large sandhill cranes counted in California's Central Valley,Winter 1983-1984. Missing values indicate no data were collected. Regions October November December January L.ocauons Date No.cranes Date No.canes Date No.cranes Date No.nines Chico A. Fcnn's 20 216 21-22 X 20 X 23-24 X Llano Seco Rancho 20 X 22 257 20 455 23 560 M&T Ranch 20 X 21 424 20 262 23 394 Nelson — — 20 69 24 169 Sub-totals 216 681 786 1,123 Afton Schorr Ranch 10-20 0 17-20 0 20 688 24 0 Terhel Farms 10-20 0 17-20 0 20 0 24 233 Sub-totals 0 0 688 233 Butte Sink Bean Patch, 19 1,500 19-20 X 19-20 0 26 0 Brady Ranch 18 1,168 20 2,246 20 469 26 231• Butte Basin Farm 18 509 19 934 19 60 26 0 Gray Lodge W.M.A., 17 702 19-20 X 20 630° 26 0 Sub-totals 3,879 3,180 1,159 231 Thornton Canal Ranch 25 296 27 35 12 467 28 X Cortopassi Farms 22-28 0 27-30 0 11 393 28 X 011 E. Merlo & Sons 26 188 30 279 12 635 28 X El Dorado 24 475 30 909 12 709 28 2,195 Grand Island 26-30 0 16 675 28 0 Staten Island 24 813 29 845 9 595 28 1,634 Sub-totals 1,772 2,068 3,474 3,829 Cosumnes 26 65 3 197 7 238 29 1,390 t Modesto Faith & Mape's R. 5 80 29, 128 28 142 Bogetti Harms — — — — 28 84 — — Sub-totals 80 128 226 — Merced NWR — — — — 14 32 Pixley NWR — — — — 3° 14 — — Totals 6,012 6,057 6,617 6,810 X -targe sandhill nines which probably represent the same individuals counted at a different site on the same day. •Cranes counted on the Brady Ranch and surrounding lands 'Cranes counted in the vicinity of Gray Lodge W.M.A. 29 October 1993. 'January. Managed for wintering waterfowl by state and federal agencies. 1 RESULTS DISTRIBUTION AND ABUNDANCE 1)• More than half of the population used the Butte Sink during October and November, but Central Valley Population cranes, including only 18 and 3%of the population used this region Greater and Canadian Sandhill Cranes, began in December and January,respectively. Declines arriving on their wintering areas the third week in the use of the Butte Sink corresponded with of September, and by late October most were an increase at Chico, Thornton, and in the Co- present in California's Central Valley. The pop- sumnes region.Thornton replaced the Butte Sink ulation wintered at eight regions during the win- as the most important winter area in December, Ft"` tern of 1983-1984 and 1984-1985 (Fig. 1), and supporting 53% of the population. In January, - the distribution of the population varied season- Thornton and the adjacent Cosumnes River ally among the regions of the winter range(Table floodplain supported 76% of the population. VI-L3D