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ROBERT L. WILKERSON AND RODNEY B. SIEGELFIGURE 13. Current and former breeding range of Burrowing Owl in California, and percent of the 2006-2007statewide breeding population estimated to occur in each region based on “best’ estimates” (see Methods forexplanation of “best” estimates) during the 2006-2007 survey.[28]
DISTRIBUTION AND ABUNDANCE OF BURROWING OWLS IN CALIFORNIATABLE 5. Number and percent of owl pairs detected during the 2006 and 2007 statewide Burrowing Owlsurvey, classified by land ownership or jurisdiction._____________________________________________________Number of Burrowing Owl pairs detectedRandomly-selectedRandomly-selected blocksLand ownership or jurisdiction blocks only and historic breeding blocksPrivate 415 (96.7%) 1,592 (90.6%)FederalBureau of Land Management 2 (0.5%) 18 (1.0%)Department of Defense 12 (2.7%) 50 (2.8%)NASA 0 11 (0.6%)National Wildlife Refuge System 0 38 (2.2%)Local government 0 26 (1.5%)State government 0 22 (1.3%)Tribal 0 1 (0.1%)Total 429 1,758TABLE 6. Primary habitats indicated by field observers at sites where Burrowing Owl pairs were found, andprevalence of ground squirrels at those sites.No. of sites wherePercentage of assessedNo. of ground squirrel sites with groundPrimary habitat breeding sites a presence was assessed squirrels presentIrrigation canal b 383 285 19Natural grassland 211 211 92Idle or fallow field 121 103 76Field crop 114 10 60Pasture 100 100 87Brushland 75 75 67Airport 45 45 91Golf course 30 30 100Levee 27 26 92Railroad 26 26 85Grain or hayfield 25 21 57Row crop 14 6 43Other 116 107 48Total 1,287 1,045 64a In many cases breeding sites encompassed multiple Burrowing Owl pairs.b Here the term “irrigation canal” is used broadly to indicate any man-made concrete or earthen waterconveyance structure.owls on those blocks during the 2006-2007survey increased as a function of the number ofowls detected during the 1991-1993 survey (Fig.14; χ 2 = 12.41; P = 0.0004). For example, the1predicted probability of detecting owls duringthe 2006-2007 survey in blocks where just onepair was detected during the 1991-1993 surveywas about 0.36, compared to 0.93 in blockswhere 25 pairs of owls were detected during the1991-1993 survey.DISCUSSIONOur survey method likely contains somesystematic sources of error. As DeSante et al.(2007) pointed out, the inability of observers to[29]
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THE 2007 AND 2008 NORTH AMERICAN BR
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