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Figure 1. Breeding and winter ranges of the Sharp-tailed Sparrow. Solid circles indicate specimen records, open circles additional localities reported in the literature. A solid line delimits the areas in which specimens were collected in June, July, and August, whereas the dashed line delimits the areas in which specimens were collected in December, January, and February. The southern Ontario bird collected 12 June and the Iowa specimen collected 29 June were probably stragglers.
Figure 2. Breeding and winter ranges of the Le Conte's Sparrow. The symbols are the same as in Figure 1.
Figure 3. Ranges of the Le Conte's and Sharp-tailed Sparrows in relation to physiography. The range of leconteii is bounded by a solid line, and where the range of caudacuta differs from that of leconteii it is bounded by a line of dots and dashes. The dotted line represents the southern extent of Wisconsin glaciation.
Figure 4. Ranges of the Le Conte's and Sharp-tailed Sparrows in relation to vegetation types. Symbols not indicated in the key are the same as in Figure 3.
Figure 5. Oblique aerial photograph of the study area and vicinity near the Souris River east of Upham, McHenry County, North Dakota. The study area is outlined in white. View towards northwest. (Courtesy of John W. Winship and Bureau of Sport Fisheries and Wildlife.)
Figure 6. Vertical aerial photograph of the study area, approximate boundaries indicated by white lines. The southern (bottom) square was used in 1965, the entire area in 1966. The vegetation in the lower square is predominantly Spartina pectinata. The dark patch in the upper square is predominantly Hordeum jubatum. The lighter triangle of vegetation on the west side is Spartina mixed with Hordeum. Most of the upper square was hayed in 1964 and was stubble at the beginning of 1965. (Courtesy of John W. Winship and Bureau of Sport Fisheries and Wildlife.)
Figure 11. Le Conte's Sparrow territories in 1965. The quadrats are 100 feet square and take the number of the lowest numbered stake. Solid circles denote identified (color-marked) singing individuals, and solid squares denote identified, nonsinging individuals; open circles denote unidentified singing birds; half-open circles denote flight songs; and N denotes a nest site. Heavy lines delimit territories, and the numbers within them refer to the last three digits of the band number of the resident male. The broken territorial boundaries of 359 and 360 indicate where either a seasonal change in boundary or an overlap of territories occurred. The dot circumscribed by diagonal lines represents a single observation of 360.
Figure 12. Le Conte's Sparrow territories in 1966. In addition to the symbols used in Figure 11, the triangles indicate where the birds were mist-netted. Stakes and quadrats were renumbered in 1966, but stakes 1 to 6 are the same for both years. Changes in territories, indicated by hatching, are described in the text. |
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