Publications
Filter Total Items: 1990
Coupled nitrogen and calcium cycles in forests of the Oregon Coast Range
Nitrogen (N) is a critical limiting nutrient that regulates plant productivity and the cycling of other essential elements in forests. We measured foliar and soil nutrients in 22 young Douglas-fir stands in the Oregon Coast Range to examine patterns of nutrient availability across a gradient of N-poor to N-rich soils. N in surface mineral soil ranged from 0.15 to 1.05% N, and was positively relate
Authors
S.S. Perakis, D.A. Maguire, T.D. Bullen, K. Cromack, R.H. Waring, J.R. Boyle
Influence of habitat heterogeneity on distribution, occupancy patterns, and productivity of breeding peregrine falcons in central West Greenland
We used occupancy and productivity data collected at 67 cliffs used for nesting from 1972 to 1999 to assess patterns of distribution and nest-site selection in an increasing population of Peregrine Falcons (Falco peregrinus) in central West Greenland. Peregrine Falcons breeding at traditionally occupied cliffs used for nesting had significantly lower variation in productivity and thus these cliffs
Authors
C.S. Wightman, M.R. Fuller
Northern goshawk diet during the nesting season in southeast Alaska
[No abstract available]
Authors
S.B. Lewis, K. Titus, M.R. Fuller
Landscape attributes and life history variability shape genetic structure of trout populations in a stream network
Spatial and temporal landscape patterns have long been recognized to influence biological processes, but these processes often operate at scales that are difficult to study by conventional means. Inferences from genetic markers can overcome some of these limitations. We used a landscape genetics approach to test hypotheses concerning landscape processes influencing the demography of Lahontan cutth
Authors
H.M. Neville, J. B. Dunham, M.M. Peacock
Fine-scale natal homing and localized movement as shaped by sex and spawning habitat in chinook salmon
Natal homing is a hallmark of the life history of salmonid fishes, but the spatial scale of homing within local, naturally reproducing salmon populations is still poorly understood. Accurate homing (paired with restricted movement) should lead to the existence of fine-scale genetic structuring due to the spatial clustering of related individuals on spawning grounds. Thus, we explored the spatial r
Authors
Helen Neville, Daniel Isaak, J. B. Dunham, Russel Thurow, B. Rieman
Observations of rapid colonization of constructed ponds by Western toad (Bufo boreas) in Oregon, USA
No abstract available.
Authors
Christopher A. Pearl, Jay Bowerman
Long-term golden eagle studies in Denali National Park and Preserve
No abstract available.
Authors
Carol L. McIntyre, Karen Steenhof, Michael N. Kochert, Michael W. Collopy
Conservation genetics in the USGS
Conservation genetics is the application of the tools and concepts of genetics to the conservation of biological resources. Once too sophisticated and expensive for routine use, the tools of conservation genetics are now widely used to address many complex management questions. These novel methods of analysis can augment assessments made with traditional methods and can bring new information to li
Authors
Ruth Jacobs, Susan Haig, Sandra L. Talbot, James Winton, Tim King, Kate Kendall
Influence of alternative silviculture on small mammals
HIGHLIGHT: A variety of harvest methods promote diversity within forests while still generating income. For example, recent studies have shown that when dead wood is left on the forest floor during harvest, biodiversity increases. A new Cooperative Forest Ecosystem Research (CFER) program fact sheet summarizes how small mammals respond to dead wood in forests that are harvested with alternative me
Authors
David L. Waldien, John P. Hayes
Effects of radio marking on prairie falcons: Attachment failures provide insights about survival
From 1999-2002, we attached satellite-received platform transmitter terminals (PTTs) to 40 adult female prairie falcons (Falco mexicanus) on their nesting grounds in the Snake River Birds of Prey National Conservation Area (NCA) in southwest Idaho. We used 3 variations of a backpack harness design that had been used previously on raptors. Each radiomarked falcon also received a color leg band with
Authors
Karen Steenhof, Kirk K. Bates, Mark R. Fuller, Michael N. Kochert, J.O. McKinley, Paul M. Lukacs
Sex determination of Pohnpei Micronesian kingfishers using morphological and molecular genetic techniques
Conservation-oriented studies of Micronesian Kingfishers (Todiramphus cinnamominus) have been hindered by a lack of basic natural history information, despite the status of the Guam subspecies (T. c. cinnamominus) as one of the most endangered species in the world. We used tissue samples and morphometric measures from museum specimens and wild-captured Pohnpei Micronesian Kingfishers (T. c. reiche
Authors
Dylan C. Kesler, I.F. Lopes, Susan M. Haig
Landscape context mediates influence of local food abundance on wetland use by wintering shorebirds in an agricultural valley
While it is widely understood that local abundance of benthic invertebrates can greatly influence the distribution and abundance of wetland birds, no studies have examined if wetland landscape context can mediate this relationship. We studied the influence of wetland food abundance and landscape context on use of agricultural wetlands by wintering dunlin (Calidris alpina) and killdeer (Charadrius
Authors
Oriane W. Taft, Susan M. Haig