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Documents disponibles écrits par cet auteur (10)
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Article
Bryan L. Daniels, Auteur ; David H. Ward, Auteur ; Jeffrey M. Black, Auteur
Article
Kyle A. Spragens, Auteur ; Jeffrey M. Black, Auteur ; Matthew D. Johnson, AuteurDans Wildfowl (65 2015)The recovered Aleutian Cackling Goose Branta hutchinsii leucopareia population nowadays relies during spring on livestock-grazed pastures along the coast of Humboldt and Del Norte Counties, northern California, USA. Selection of these foraging s[...]
Article
Jeffrey M. Black, Auteur ; Carol Gress, Auteur ; Jacob W. Byers, Auteur ; Emily Jennings, Auteur ; Craig Ely, AuteurDans Wildfowl (60 2010)Tundra Swan Cygnus columbianus columbinanus phenology and behaviour at the Eel River delta and southern Humboldt Bay in northern California, USA, is described. Counts made each January from 1963 onwards peaked at 1,502 swans in 1988. Monthly cou[...]
Article
Elizabeth Elkinton, Auteur ; Long Lo, Auteur ; Jeffrey M. Black, AuteurBlack Brant Branta bernicla nigricans arrive at their breeding grounds in arctic and sub-arctic North America and eastern Russia in spring, a time when food resources are limited. They rely largely on energy stores, acquired at staging sites, fo[...]
Article
Kyle A. Spragens, Auteur ; Emily R. Bjerre, Auteur ; Jeffrey M. Black, AuteurThe Black Brant Branta bernicla nigricans is a seagrass-obligate goose, strongly tied to the estuaries of the Pacific Flyway coast of North America. Black Brant are unique in that they remain reliant on their traditional food resource, in contra[...]
Article
Elizabeth H. Rave, Auteur ; Robert C. Fleischer, Auteur ; Fern Duvall, Auteur ; Jeffrey M. Black, AuteurWe determined the effects of inbreeding, husbandry, age, and pair bond tenure on reproductive success in captive populations of endangered Hawaiian Geese, or Nene Branta sandvicensis. We found evidence of inbreeding depressions among captive Nen[...]
Article
Jeffrey M. Black, Auteur ; Derek E. Lee, Auteur ; David H. Ward, AuteurDans Wildfowl (60 2010)Foraging home ranges of Black Brant Branta bernicla nigricans (n = 8) were quantified to determine proportional use of available intertidal habitat during spring migration stopover at Humboldt Bay, California, USA. The average foraging range are[...]
Article
Gavin M. Siriwardena, Auteur ; Jeffrey M. Black, AuteurBarnacle goose parents caring for four or more goslings devoted less time to foraging than did those with fewer offspring, and more time was spent being vigilant. Goslings gained substantial benefits from being in the family unit, including bett[...]
Article
Anne E. Mini, Auteur ; Dominic C. Bachman, Auteur ; Josh Cocke, Auteur ; Kenneth M. Griggs, Auteur ; Kyle A. Spragens, Auteur ; Jeffrey M. Black, AuteurDans Wildfowl (61 2011)Aleutian Cackling Geese Branta butchinsii leucopareia were feared extinct until a remnant population was discovered on Buldir island by Robert "Sea Otter" Jones in 1962. Population declines, primarily due to predation by Arctic Foxes Alopex lago[...]
Article
Jacob L. Berl, Auteur ; Jeffrey M. Black, AuteurDans Wildfowl (61 2011)Observations were made of feeding American Wigeon Anas americana to assess their vigilance levels in relation to foraging location. American Wigeon increased vigilance levels: 1) while foraging on land compared to on water, 2) while grazing prog[...]
