. La Canadian field-naturaliste. A ST. GEORGES BAY 0 110 km de l'homme' de la ligne d'alimentation de la rivière iv ^^IGONIS J'NT@ %c., .,../vv&gt ; â â /BRIERD POMOUETt^iSs' BROOK © HARBOUR I l^^TRACADIEl IBOURJ j "POMQU fRIVER e SOUTHS RIVER RIVER 3A5PEREAI .AKE.  ¢ nid actif 1975 &AMP ; 1976 ©nid actif 1975 ©nid actif 1976 O inoctive nest 1975 Figure 1. L'emplacement des sites de nids de Balbuzards dans le comté d'Antigonish, en Nouvelle-Écosse, en 1975 et 1976. La zone ombrée de l'insert montre l'emplacement de la zone d'étude en Nouvelle-Écosse. L'apparition de sites de nids de Balbuzards sur les poteaux électriques est très répandue (Strom-Gotsa dans Brown et

• Contributeur: Book Worm / Alamy Banque D'Images
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. The Canadian field-naturalist. A ST. GEORGES BAY 0 1 10 km RIGHTS' river iv POWER LINE ^I^NT IGONIS@%c., _., ../vv> â â /BRIERD' BROOK POMOUETt^iSs © HARBOUR I l^i^TRACADIEl "IBOURJ fRIVER e SOUTHS POMQU RIVER RIVER 3A5PEREAI .AKE. ⢠active nest 1975 & 1976 ©active nest 1975 ©active nest 1976 O inoctive nest 1975 Figure 1. Locations of Osprey nest sites in Antigonish County, Nova Scotia, in 1975 and 1976. The shaded area in the insert shows location of the study area in Nova Scotia. The occurrence of Osprey nest sites on utility poles is widespread (Strom-Gotsa in Brown and Waterston 1962; Ames 1964; Schroeder 1972; Melquist 1974), and happens in neighboring New Brunswick(Stocek 1972) and elsewhere in Nova Scotia (unpublished data). In our study area, Ospreys seemed to prefer these sites, perhaps because intensive cutting of the forest has reduced natural alternatives. In both years the closest natural nest sites were 2 km apart. In contrast, five nests in 1974, six in 1975, and seven in 1976 were found along one 3-km segment of power line; four of these nests were on one 800-m segment in 1976. Prevost, Seymour, and Titman (in preparation) provide evidence of social foraging in Ospreys, a behavior that may be facilitated by nesting in colonies. Power lines apparently provided the most favorable locations for colonial nesting in northeastern Nova Scotia. Reproductive Success The mean clutch and brood sizes were 2.61 and 2.2 in 1975, and 2.95 and 2.3 in 1976. Clutch size distribution for both 1975 and 1976 combined was (clutch size-number of nests) 1-4, 2-9, 3-16, and 4-9. The success rates of 41 occupied nests (with additional data from adjacent Pictou County) in 1975 and 1976 are shown in Table 1. A hurricane late in the nestling period of 1975 (28 July) dislodged three nests from utility poles and probably killed the young. Another nest was blown from a tree, but the two. Please note that these images are extracted from scanned page ima

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