. The Canadian field-naturalist. The Canadian Field-Naturalist Vol. 107. I LEGEND • Nest 0^ Figure 5. Sass River Composite Nesting Areas, 1984-1991. male on the basis of behaviour at ANWR (Bishop 1984). In 1982, the two birds returned to nest in the same wetland. By 1987, the male's colour-bands had dis- appeared but the crane could still be identified by the metal band low on the right leg. The pair has nested in the Lobstick marshes each year in 1982-1991, using an area of about km- (Figure 3). 6. Breeding Range Extensions Sass River Since 1984, new pairs have begun nesting in the S
. The Canadian field-naturalist. The Canadian Field-Naturalist Vol. 107. I LEGEND • Nest 0^ Figure 5. Sass River Composite Nesting Areas, 1984-1991. male on the basis of behaviour at ANWR (Bishop 1984). In 1982, the two birds returned to nest in the same wetland. By 1987, the male's colour-bands had dis- appeared but the crane could still be identified by the metal band low on the right leg. The pair has nested in the Lobstick marshes each year in 1982-1991, using an area of about km- (Figure 3). 6. Breeding Range Extensions Sass River Since 1984, new pairs have begun nesting in the Sass River portion of the breeding range (CNA S- 11, S-12, S-13, S-14, S-15, S-16). In addition, other recent nests (27-90 and 12-91; 29-91; 19-88, 22-89 and 30-91, Figure 5) have not yet been assigned to a definite CNA. All nine new nesting pairs are identifiable because of colour-bands on one or both members of each pair. All of these new CNAs and nests are located on the periphery of existing territories but are within the Sass River breeding range. Several vacant CNAs (S-4, S-5, S-7), as well as the western portion of the large CNA S-1 (Figure 5) not used since 1970 (Kuyt and Goossen 1987), have now been encroached upon by new breeders. The borders of CNA S-7 are indeterminate and the area has been vacant except for the northeast portion used since 1983 by a pair in S-9. In 1990 a pair of colour- banded subadult cranes spent part of spring and sum- mer along a section of Preble Creek near the centre of CNA S-7. The continuous use of the area by the cranes (1987 male BWB-YBY and 1985 female White-Green) implied they would return to breed in 1991. They did so, but nested (late in the season) just south of CNA Sass-7 (nest 29-91, Figure 5). In 1988 and 1989, two colour-banded cranes (1985 male Yellow-Green and 1984 female White-Blue) nested at nests 19-88 and 22-89 north of CNA Sass- 11 (Figure 5). None of the three eggs produced (2 eggs in 1988, 1 egg in 1989) was viable nor
Size: 1675px × 1491px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorottawafi, bookcentury1900, bookdecade1910, bookyear1919
