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視聴覚メディア・ノート
Probably the first photo to depict 3 different subspecies of Canada Goose in Alaska: moffitti, fulva, and parvipes.
観察結果の詳細
Compared with fulva: larger body, thinner and longer neck, lighter breast and dorsum, and white throat/cheek patch is whiter and different in shape. Steve Heinl wrote in his "Spring 2016 Southeast Alaska Bird Report": "A large, pale-breasted Canada Goose at the Mendenhall Wetlands 22 April 2016 was identified as subspecies moffitti/maxima (GBV). The bird was described as being slightly larger than the local, dark-breasted fulva Canada Geese it accompanied. There are two prior local reports of large pale-breasted birds (Pt. Bridget S.P., 19 May 2008, PMS; Mendenhall Wetlands, 30 April 2007, GBV), which breed as close as central interior British Columbia (Campbell et al. 1990). Subspecies maxima and moffitti are similar in size and coloration, the differences being largely clinal from western North America (moffitti) east to the Midwest (maxima), and they intergrade extensively; introductions of both subspecies throughout North America have also confused their distributions—as a result, some authors treat them as one subspecies (moffitti; see Mowbray et al. 2002)." Note the similarity in the dates of at least three of these four observations! Probably the first photo to depict 3 different subspecies of Canada Goose in Alaska: moffitti, fulva, and parvipes.
テクニカル・インフォメーション
- オリジナルのファイルサイズ
- 2.41 MB