Article Abstract:
Black Brunt from Alaska has been sighted in Japan as early as Nov. 5 and as late as Mar. 15, which indicates that the birds have nesting grounds along the East Siberian Sea Coast, between Yana and Chauna rivers. Low pressure systems producing northwesterly winds across the Gulf of Alaska cause their departure for wintering areas by mid-Nov. Some of the birds in the staging population spend the winters in and around the Izembek Lagoon. Weather data from the North Pacific reveals that at least three days during Oct and Nov have tailwinds favorable for brant migration to the west.
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Article Abstract:
The ecological impacts of nest site fidelity in birds are examined. Specifically, this study looks at the relationship of the dispersal distance between consecutive nesting attempts with such factors as age, nest success, reproductive performance and spring environment for female black brant at Alaska's Tutakoke River from 1987 to 1993. Findings reveal scant proof of fidelity to natal sites. Successfully breeding brand travelled shorter distances than unsuccessfully breeding brant. Also, early nest-building brant moved farther than later nest-building brant.
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Article Abstract:
The heart rate and behavior of nine free-living Greater White fronted Geese were monitored, at wintering grounds in northern California. Heart rates varied from less than 100 beats per minute (BPM) to more than 400 BPM. Heart rate exceeded 400 BPM during agonistic encounters. Heart rates during non-strenuous activities varied from 80 to 140 BPM, rising to around 180 BPM when birds were alert.
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