Zobrazeno 1 - 10
of 24
pro vyhledávání: '"Robert A. Stehn"'
Autor:
Courtney L. Amundson, Paul L. Flint, Robert A. Stehn, Robert M. Platte, Heather M. Wilson, William W. Larned, Julian B. Fischer
Publikováno v:
Avian Conservation and Ecology, Vol 14, Iss 1, p 18 (2019)
Rapid physical changes that are occurring in the Arctic are primary drivers of landscape change and thus may drive population dynamics of Arctic-breeding birds. Despite the importance of this region to breeding and molting waterbirds, lack of a compr
Externí odkaz:
https://doaj.org/article/96687d8230f74436b7ef3c1ad2dfa8cf
Autor:
Douglas Causey, Julian B. Fischer, Jeffrey M. Welker, Wade G. Schock, Craig R. Ely, Robert A. Stehn
Publikováno v:
Journal of Fish and Wildlife Management. 9:340-347
Annual productivity is an important parameter for the management of waterfowl populations. Fall age ratio (juveniles:total birds) is an index of productivity of the preceding breeding season. However, differences in the timing of migration between fa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a660fa238008c631fcb9f36d634235f9
https://doi.org/10.3996/112015-jfwm-117
https://doi.org/10.3996/112015-jfwm-117
Publikováno v:
The Journal of Wildlife Management. 82:362-373
Accurate estimates of the age composition of populations can inform past reproductive success and future population trajectories. We examined fall age ratios (juveniles:total birds) of black brant (Branta bernicla nigricans; brant) staging at Izembek
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::60d9ca38d7aaa1ffcb3c5c994ffaad55
https://doi.org/10.1002/jwmg.21388
https://doi.org/10.1002/jwmg.21388
Publikováno v:
The Journal of Wildlife Management. 81:1468-1481
The Yukon–Kuskokwim Delta of Alaska, USA is a globally important region for numerous avian species including millions of migrating and nesting waterbirds. However, data on the current spatial distribution of critical nesting areas and the importanc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b1639fdf0dbc75f13b510e649ce5b2d7
https://doi.org/10.1002/jwmg.21322
https://doi.org/10.1002/jwmg.21322
Autor:
Heather M. Wilson, Julian B. Fischer, Robert A. Stehn, William W. Larned, Paul L. Flint, Robert M. Platte, Courtney L. Amundson
Publikováno v:
Avian Conservation and Ecology, Vol 14, Iss 1, p 18 (2019)
Rapid physical changes that are occurring in the Arctic are primary drivers of landscape change and thus may drive population dynamics of Arctic-breeding birds. Despite the importance of this region to breeding and molting waterbirds, lack of a compr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a32e49f76ea5df2d401fa46fd53d2508
http://www.ace-eco.org/vol14/iss1/art18/
http://www.ace-eco.org/vol14/iss1/art18/
Publikováno v:
Northwestern Naturalist. 96:101-106
We analyzed data on the size of nesting aggregations of Sabine's Gulls (Xema sabini) observed in the Yukon–Kuskokwim Delta (YKD), Alaska, between 1986 and 2013, to determine whether the species is a “solitary low-density nester” there, as in ot
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::528c542177afc0cd5592a8b719ca3570
https://doi.org/10.1898/1051-1733-96.2.101
https://doi.org/10.1898/1051-1733-96.2.101
Autor:
William D. Eldridge, John I. Hodges, Timothy D. Bowman, William Butler, Julian B. Fischer, Robert A. Stehn, Robert M. Platte
Publikováno v:
Trends and Traditions: Avifaunal Change in Western North America
Severe declines of waterfowl populations on the Yukon–Kuskokwim Delta (YKD), Alaska, from the 1960s through the mid-1980s, prompted the initiation in 1985 of standardized surveys of the region’s breeding birds. These entailed coordinated annual a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9b32c3c039f6ef68cb7ec8845e44c4c0
https://doi.org/10.21199/swb3.7
https://doi.org/10.21199/swb3.7
Publikováno v:
The Condor. 107:289-304
The Yellow-billed Loon (Gavia adamsii) is of conservation concern due to its restricted range, small population size, specific habitat requirements, and perceived threats to its breeding and wintering habitat. Within the U.S., this species breeds alm
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eda96ef4d43f8faaecb77b6ee98e71a5
https://doi.org/10.1093/condor/107.2.289
https://doi.org/10.1093/condor/107.2.289
Publikováno v:
The Condor. 106:288-298
Glaucous Gulls (Larus hyperboreus) nesting on the Yukon-Kuskokwim (Y-K) Delta frequently prey on juvenile waterfowl. We collected 434 Glaucous Gulls from late June to early August 1994 to examine diet. Identification of undigested prey tissue, based
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::05885be6e154ddded7ab8dcdd64f2911
https://doi.org/10.1093/condor/106.2.288
https://doi.org/10.1093/condor/106.2.288
Autor:
Robert A. Stehn, Karen L. Kincheloe
Publikováno v:
Canadian Journal of Botany. 69:1616-1627
Tundra vegetation and environmental variables were sampled on the Yukon–Kuskokwim delta in western Alaska. On transects extending from intertidal mudflat to upland tundra, we estimated cover by vascular plant species, soil moisture, salinity, relat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1aeec08758c2cc13639fb003ae24f096
https://doi.org/10.1139/b91-205
https://doi.org/10.1139/b91-205