. L'Est de la mer de Béring Tablette : océanographie et ressources / edited by Donald W. Hood et John A. Calder . La figure 39-18. Moins les colonies de macareux dans la mer de Béring. jours et commencent à éclore à la mi-juillet. Les poussins restent au nid pendant environ 29 jours avant l'envol. En 1966 et 1967, l'envol a eu lieu entre le 15 août et 7 septembre ; moyenne l'envol dates ont été 1er septembre en 1966 et 20 en 1967 (août 1968) Sealy. La productivité sur l'île Saint-Laurent en 1976, un succès de reproduction a été estimé à 0,34 jeunes ailés par nid- avec-œufs (Searing, 1977). En 1976, le taux moyen de croissance des poussins

• Contributeur: The Bookworm Collection / Alamy Banque D'Images
• ID de l’image: MAA2RE
• Taille du fichier: 14,3 MB (234,9 KB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 2532 x 1973 px | 21,4 x 16,7 cm | 8,4 x 6,6 inches | 300dpi

Informations supplémentaires

Cette image appartient au domaine public, ce qui signifie que le droit d’auteur a expiré ou que le titulaire du droit d’auteur a renoncé à ses droits. Les frais facturés par Alamy couvrent l’accès à la copie haute résolution de l’image.

Cette image peut avoir des imperfections car il s’agit d’une image historique ou de reportage.

. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . Figure 39-18. Least Auklet colonies in the Bering Sea. days and begin to hatch in mid-July. Chicks remain in the nest for about 29 days before fledging. In 1966 and 1967, fledging occurred between 15 Au- gust and 7 September; mean fledging dates were 1 September in 1966 and 20 August in 1967 (Sealy 1968). Productivity On St. Lawrence Island in 1976, reproductive suc- cess was estimated at 0.34 chicks fledged per nest- with-eggs (Searing 1977). During 1976 the average rate of chick growth was 3.7 g/d (Searing 1977). This compares favorably to the 3.3 g/d rate reported in 1967 (Sealy 1968). Whiskered Auklet (Aethia pygmaea) Distribution Whiskered Auklets are endemic to the Bering Sea and have the most limited range of the Bering Sea sea- birds. They breed on the Kamchatka Peninsula and on the Aleutian Islands from the Islands of the Four Mountains to the Near Islands (Gabrielson and Lincoln 1959). This species winters within its breed- ing range with little indication of southward move- ment, although individuals have been recorded near Honshu and Shikohu, Japan (Gabrielson and Lincoln 1959). Habitat Whiskered Auklets are reported to use nesting habi- tat similar to that used by Least Auklets: cracks and crevices in talus, boulder beaches, or cliffs (Gabrielson and Lincoln 1959). Colonies Whiskered Auklets are knowm or suspected to nest on ten of the Aleutian Islands in the central part of the chain; from Buldir Island east to the Islands of the Four Mountains and possibly to the Baby Islands (Sowls et al. 1978). The largest knovioi colony is on Buldir Island, which has an estimated population of 3, 000 (Fig. 39-19). Whiskered Auklets nest in mixed colonies with Least, Crested, and Parakeet Auklets. Status of the Bering Sea population Whiskered Auklets were once more widespread than they are now (Sowls et al. 1978). Whiskered Auklets have declined in number or di

Recherche dans la banque de photos par tags

• bookcentury1900
• bookcollectionamericana
• bookdecade1980
• bookspo