. Bulletin of the British Ornithologists' Club. Plate 2. Ferruginous White-eye x Tufted Duck, side view of Plate 3. Tufted Duck x Ferruginous White-eye, underside of adult female. concur with the Drs. Harrison in considering these characters, as found in the Tufted Duck, to be of evolutionary significance. The same remark applies to their occurrence in hybrids where they obviously appear as a result of polygenic action. It would greatly help in confirming this theory if either or both of these characters were found to occur occasionally in some other Aythya species where they are not no
. Bulletin of the British Ornithologists' Club. Plate 2. Ferruginous White-eye x Tufted Duck, side view of Plate 3. Tufted Duck x Ferruginous White-eye, underside of adult female. concur with the Drs. Harrison in considering these characters, as found in the Tufted Duck, to be of evolutionary significance. The same remark applies to their occurrence in hybrids where they obviously appear as a result of polygenic action. It would greatly help in confirming this theory if either or both of these characters were found to occur occasionally in some other Aythya species where they are not normally found, such as white under-tail coverts in A. affinis, A. coUaris, or A. marila: or white at the base of the bill in A. nvroco, A. haeri or A. ausfra/is. In this connection. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Ornithologists' Club. London : British Ornithologists' Club
Size: 2959px × 845px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbritishornithologistsclub, bookcentury1900, bookcollec
