Publications
Filter Total Items: 1990
Interaction between introduced trout and larval salamanders (Ambystoma macrodactylum) in high-elevation lakes
The larval stage of the long-toed salamander (Ambystoma macrodactylum) is the top vertebrate predator in high-elevation fishless lakes in the North Cascades National Park Service Complex, Washington (U.S.A.). Although most of these high-elevation lakes were naturally fishless, trout have been stocked in many of them. We sought to determine the effects of physicochemical factors and introduced trou
Authors
T. Tyler, W.J. Liss, L. Ganio, Gary L. Larson, Robert L. Hoffman, E. Deimling, G.A. Lomnicky
Fire, vegetation, and scale: Toward optimal models for the Pacific Northwest
No abstract available.
Authors
D. McKenzie
Organochlorine pesticides, PCBs, and mercury in hawk, falcon, eagle, and owl eggs from the Lipetsk, Voronezh, Novgorod and Saratov regions, Russia, 1992-1993
Fifty-two eggs (one per nest) of 12 species of raptors were collected in 1992-93 for contaminant analysis in three southern European locations in Russia. One Peregrine Falcon (Falco peregrinus) egg was also collected farther northwest in the Novgorod region. A high DDE concentration (27.3 ppm, wet weight [w/w]) in the Peregrine Falcon egg raised concern for the species in European Russia south of
Authors
Charles J. Henny, S.A. Ganusevich, F.P. Ward, T.R. Schwartz, A.L. Mischenko, V.N. Moseikin, V.S. Sarychev
Spatial patterns of tropospheric ozone in the Mount Rainier region of the Cascade Mountains, USA
Few data exist on tropospheric ozone concentrations in rural and wildland areas of western Washington, U.S.A. We measured tropospheric ozone in Mount Rainier National Park and the Puget Sound region of Washington using electronic analyzers and passive samplers during the summers of 1994 and 1995. Electronic analyzers recorded hourly ozone concentrations from five locations between Seattle and Moun
Authors
S. Brace, D. L. Peterson
Avian movements and wetland connectivity in landscape conservation
The current conservation crisis calls for research and management to be carried out on a long-term, multi-species basis at large spatial scales. Unfortunately, scientists, managers, and agencies often are stymied in their effort to conduct these large-scale studies because of a lack of appropriate technology, methodology, and funding. This issue is of particular concern in wetland conservation, fo
Authors
Susan M. Haig, D.W. Mehlman, L.W. Oring
Long-term hydrologic effects on marsh plant community structure in the southern Everglades
Although large-scale transformation of Everglades landscapes has occurred during the past century, the patterns of association among hydrologic factors and southern Everglades freshwater marsh vegetation have not been well-defined. We used a 10-year data base on the aquatic biota of Shark Slough to classify vegetation and describe plant community change in intermediate- to long-hydroperiod Evergla
Authors
David E. Busch, W.F. Loftus, O. L. Bass
Variability of Secchi disk readings in an exceptionally clear and deep caldera lake
SUMMARY: The Peromyscus leucopus on a 17-acre study area were live-trapped, marked, and released over a seven-day period. On the three following nights intensive snap-trapping was done on the central acre of the study plot. The animals caught by snap traps in the central acre represented the population of the central acre and several surrounding acres. By the currently accepted methods of
Authors
Gary L. Larson, M. W. Buktenica
KERNELHR: A program for estimating animal home ranges
Kernel methods are state of the art for estimating animal home-range area and utilization distribution (UD). The KERNELHR program was developed to provide researchers and managers a tool to implement this extremely flexible set of methods with many variants. KERNELHR runs interactively or from the command line on any personal computer (PC) running DOS. KERNELHR provides output of fixed and adaptiv
Authors
D.E. Seaman, B. Griffith, R. A. Powell
Postfledging nest dependence period for bald eagles in Florida
We studied the postfledging dependency period in bald eagles (Haliaeetus leucocephalus), a little studied but important period in the life cycle of avian species. Bald eagles in Florida had a postfledging dependency period of 4-11 weeks (15-22 weeks old). The length of the dependency period did not vary by year of study, sex, number of fledgings, timing of fledging, or hatch order (P > 0.05). Mean
Authors
P.B. Wood, Michael W. Collopy, C.M. Sekerak
Phytoplankton assemblages in high-elevation lakes in the northern Cascade Mountains, Washington State, USA
Phytoplankton assemblages in high-elevation lakes of North Cascades National Park Service Complex were studied during the open-water period in 1989. Collectively, 93 taxa were identified in 55 samples from 51 lakes. Based on cell densities, cyanobacteria had the highest relative abundance (36.7 %), followed by chlorophytes (29.8 %), and chrysophytes (19.6 %). Aphanocapsa delicatissima had the high
Authors
Gary L. Larson, C. D. McIntire, R.E. Truitt, W.J. Liss, Robert L. Hoffman, E. Deimling, G.A. Lomnicky
Relationships among environmental variables and distribution of tree species at high elevation in the Olympic Mountains
Relationships among environmental variables and occurrence of tree species were
investigated at Hurricane Ridge in Olympic National Park, Washington, USA. A transect
consisting of three plots was established down one north-and one south-facing slope in
stands representing the typical elevational sequence of tree species. Tree species
included subalpine fir (Abies lasiocarpa), Douglas-fir (Pseu
Authors
Andrea Woodward
Assessing relative abundance and reproductive success of shrubsteppe raptors
From 1991-1994, we quantified relative abundance and reproductive success of
the Ferruginous Hawk (Buteo regalis), Northern Harrier (Circus cyaneus), Burrowing Owl
(Speotytoc unicularia), and Short-eared Owl (Asio flammeus) on the shrubsteppe plateaus
(benchlands) in and near the Snake River Birds of Prey National Conservation Area in
southwestern Idaho. To assess relative abundance, we search
Authors
Robert N. Lehman, L.B. Carpenter, Karen Steenhof, Michael N. Kochert