. La Canadian field-naturaliste. La figure 1. Cincle d'Amérique adultes têtard à la grenouille à queue des oisillons au nid sous un pont sur une route forestière Tamihi Creek, en Colombie-Britannique, en juin 2002. Photographie par Roberta Olenick. à plusieurs reprises, se nourrissant d'{La grenouille à queue Ascaphus truei) larves. Le travail de terrain sur le cincle d'Amérique a été menée dans le bassin hydrographique de la rivière Chilliwack situé dans le cas- cade montagnes du sud-ouest de la Colombie-Britannique, Canada. Tout en observant les nids de balancier en juin et juillet 2002, nous avons relevé qu'au moins deux paires différentes de l'Ameri- peut, assister à des nids sur l'Tami

• Contributeur: Book Worm / Alamy Banque D'Images
• ID de l’image: RG2TTR
• Taille du fichier: 7,1 MB (526,2 KB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 1675 x 1492 px | 28,4 x 25,3 cm | 11,2 x 9,9 inches | 150dpi

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 Canadian field-naturalist. Figure 1. Adult American Dipper delivering Tailed Frog tadpole to nestlings at a nest under a logging road bridge on Tamihi Creek, British Columbia, in June 2002. Photograph by Roberta Olenick. on several occasions feeding on Tailed Frog {Ascaphus truei) larvae. Field work on the American Dipper was conducted in the Chilliwack River watershed located in the Cas- cade Mountains of southwestern British Columbia, Canada. While observing dipper nests in June and July 2002, we noted at least two different pairs of Ameri- can Dippers, attending separate nests on Tamihi Creek, a tributary of the Chilliwack River (49.02 N, 121.50 W, . Figure 2: Adult American Dipper delivering Tailed Frog tad- pole to newly fledged dipper on Tamihi Creek, British Columbia in July 2002. Photograph by Roberta Olenick. elevation 545 m) feeding Tailed Frog tadpoles to their young. Roberta Olenick photographed those dippers delivering Tailed Frog tadpoles to nestlings or fledg- lings at each nest site (Figures 1 and 2). On one occasion, an adult dipper captured a very large Tailed Frog tadpole (estimated length 5-6 cm) and attempted to feed it to one of its fledglings. The fledgling dipper struggled to swallow the large prey item without success. Several times, the adult dipper retrieved the tadpole, knocked it vigorously against a rock and manipulated the large wide head in its bill. Eventually, after several minutes of handling by the adult, the fledgling dipper managed to swallow the large tadpole whole. During routine annual benthic invertebrate collec- tions in April 1999-2002, we infrequently captured Tailed Frog tadpoles in our Surber samplers using kick-sampling procedures. Larval Tailed Frogs have a distinct round mouth, well adapted to use as suction onto the surface of in stream rocks, making them relatively easy to identify. Tailed Frog larvae were found on several tributaries of the Chilliwack River including Tamihi Creek, Borden Creek, and Chipmunk C

Recherche dans la banque de photos par tags

• bookauthorottawafi
• bookcentury1900
• bookdecade1910
• bookyear1919