. The Canadian field-naturalist. The Canadian Field-Naturalist Vol. 107 LEGEND. 32-90 N««l Figure 3. Lobstick and Alberta Composite Nesting Areas, 1985-1991, and new 1990 Alberta nest sites. portion of the nonbreeder area. I had failed to locate the pair's nest during spring surveys. No nests had been found there since Novakowski (1966) recorded nests in 1964 and 1965. In spring 1984, 1 found a nest near the birds' August 1983 location and a pair of cranes has nested in the territory each year thereafter. The pair, although successful in 1983, failed to hatch one of its eggs in 1984, and both
. The Canadian field-naturalist. The Canadian Field-Naturalist Vol. 107 LEGEND. 32-90 N««l Figure 3. Lobstick and Alberta Composite Nesting Areas, 1985-1991, and new 1990 Alberta nest sites. portion of the nonbreeder area. I had failed to locate the pair's nest during spring surveys. No nests had been found there since Novakowski (1966) recorded nests in 1964 and 1965. In spring 1984, 1 found a nest near the birds' August 1983 location and a pair of cranes has nested in the territory each year thereafter. The pair, although successful in 1983, failed to hatch one of its eggs in 1984, and both eggs failed in 1985. On 24 May 1986, the banded male was found dead near the nest, as a result of heart muscle degeneration (G. Wobeser, per- sonal communication). Of the two salvaged eggs, one hatched and the other was non-viable. Later in the season we saw a single adult (presumably the surviv- ing mate of the banded crane) and still later a pair of unhanded cranes in CNA SK-2 (Figure 4). The following spring a pair (neither bird banded) returned, and on 29 April 1987 the birds were found with a nest (9-87) close to the nest sites of the previ- ous three years. Neither of the two eggs laid in 1987 was viable. T. Stehn (personal communication) advised he was unable to find this breeding pair on its winter territory in Texas in January 1988, and he believed one of the birds may have mated with the widowed bird from another pair. On 10 May 1988 I found a relatively late nest (26-88) in the south end of the nonbreeder area km from the previous year's nest. A pair of cranes and a nest were also located here the following year, but again the pair from this territory encountered problems, as T. Stehn (personal communication) reported that the unhanded female disappeared in winter and was presumed dead. The male then found a new mate, a bird colour-banded in 1986 (Red-Yellow). This pair was found nesting in CNA SK-2 in 1990 and 1991. The nesting in 1990 was late in the season (
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