Do mammalian nest predators follow human scent trails in the shortgrass prairie?
S. K. Skagen, T.R. Stanley, M.B. Dillon
1999, The Wilson Bulletin (111) 415-420
Nest predation, the major cause of nest failure in passerines, has exerted a strong influence on the evolution of life history traits of birds. Because human disturbance during nest monitoring may alter predation rates, we investigated whether human scent affected the survival of artificial ground nests in shortgrass prairie. Our...
Variation in net trophic transfer efficiencies among 21 PCB congeners
C.P. Madenjian, L.J. Schmidt, S.M. Chernyak, R.F. Elliott, T.J. Desorcie, R.T. Quintal, L.J. Begnoche, R.J. Hesselberg
1999, Environmental Science & Technology (33) 3768-3773
We tested the hypothesis that the efficiency with which fish retain polychlorinated biphenyl (PCB) congeners from their food strongly depends on Kow and degree of chlorination of the congener. We used diet information, determinations of concentrations of individual PCB congeners in both coho salmon (Oncorhynchus kisutch) and their prey, and bioenergetics modeling...
Comparative sequence analyses of sixteen reptilian paramyxoviruses
W. Ahne, W.N. Batts, Gael Kurath, J. R. Winton
1999, Virus Research (63) 65-74
Viral genomic RNA of Fer-de-Lance virus (FDLV), a paramyxovirus highly pathogenic for reptiles, was reverse transcribed and cloned. Plasmids with significant sequence similarities to the hemagglutinin-neuraminidase (HN) and polymerase (L) genes of mammalian paramyxoviruses were identified by BLAST search. Partial sequences of the FDLV genes were used to design primers...
Sidescan-sonar mapping of benthic trawl marks on the shelf and slope off Eureka, California
A. M. Friedlander, G.W. Boehlert, M.E. Field, J.E. Mason, J.V. Gardner, P. Dartnell
1999, Fishery Bulletin (97) 786-801
The abundance and orientation of trawl marks was quantified over an extensive portion (>2700 km2) of the Eureka, California, outer shelf and slope, an important commercial bottom trawling ground for such high-value species as rockfish, sole, and sablefish. Fishing logbook data indicate that the entire reporting area was trawled about...
Reexamining fire suppression impacts on brushland fire regimes
Jon E. Keeley, C. J. Fotheringham, Marco Morais
1999, Science (284) 1829-1832
California shrubland wildfires are increasingly destructive, and it is widely held that the problem has been intensified by fire suppression, leading to larger, more intense wildfires. However, analysis of the California Statewide Fire History Database shows that, since 1910, fire frequency and area burned have not declined, and fire size...
Chemical composition and geologic history of saline waters in Aux Vases and Cypress Formations, Illinois Basin
I. Demir, B. Seyler
1999, Aquatic Geochemistry (5) 281-311
Seventy-six samples of formation waters were collected from oil wells producing from the Aux Vases or Cypress Formations in the Illinois Basin. Forty core samples of the reservoir rocks were also collected from the two formations. Analyses of the samples indicated that the total dissolved solids content (TDS) of the...
Letters: Defending whole animal collections
N.J. Scott Jr., M.R. Jennings
1999, BioScience (49) 511-512
No abstract available. ...
Dissolved sulfide distributions in the water column and sediment pore waters of the Santa Barbara Basin
J.S. Kuwabara, A. VanGeen, D.C. McCorkle, J.M. Bernhard
1999, Geochimica et Cosmochimica Acta (63) 2199-2209
Dissolved sulfide concentrations in the water column and in sediment pore waters were measured by square-wave voltammetry (nanomolar detection limit) during three cruises to the Santa Barbara Basin in February 1995, November–December 1995, and April 1997. In the water column, sulfide concentrations measured outside...
Changes in element contents of four lichens over 11 years in the Boundary Waters Canoe Area Wilderness, northern Minnesota
James P. Bennett, C. M. Wetmore
1999, Environmental and Experimental Botany (41) 75-82
Four species of lichen (Cladina rangiferina, Evernia mesomorpha, Hypogymnia physodes, and Parmelia sulcata) were sampled at six locations in the Boundary Waters Canoe Area Wilderness three times over a span of 11 years and analyzed for concentrations of 16 chemical elements to test the hypotheses that corticolous species would accumulate higher amounts...
Extirpation and recolonization in a metapopulation of an endangered fish, the tidewater goby
K. D. Lafferty, C. C. Swift, R.F. Ambrose
1999, Conservation Biology (13) 1447-1453
The tidewater goby ( Eucyclogobius newberryi ), an endangered species in the United States, occurs in a series of isolated coastal wetlands in California. Using historical presence-absence data and our own surveys, we estimated annual rates of extirpation and recolonization for several populations of the goby in southern California. As predicted, large...
Field guide to the continental Cretaceous-Tertiary boundary in the Raton basin, Colorado and New Mexico
C. L. Pillmore, D. J. Nichols, Fleming
1999, GSA Field Guides (1) 135-155
This guide consists of three general sections: an introduction that includes discussions of Raton basin stratigraphy and the Cretaceous Tertiary (K-T) boundary; descriptions of the geology along the route from Denver, Colorado, to Raton, New Mexico; and descriptions of several K-T sites in the Raton basin. Much of the information...
Subcutaneous anchor attachment increases retention of radio transmitters on Xantus' and marbled murrelets
Scott H. Newman, John Y. Takekawa, Darrell L. Whitworth, Esther E. Burkett
1999, Journal of Field Ornithology (70) 520-534
We modified a subcutaneous anchor attachment and achieved transmitter reten- tion times that exceeded those reported previously for other attachments used on alcids. Traditional suture and epoxy attachment methods were used on Xantus' Murrelets in 1995 and 1996, while the modified attachment was used for Xantus' Murrelets in 1996 and...
Long-term prairie falcon population changes in relation to prey abundance, weather, land uses, and habitat conditions
Karen Steenhof, Michael N. Kochert, L.B. Carpenter, Robert N. Lehman
1999, The Condor (101) 28-41
We studied a nesting population of Prairie Falcons (Falco mexicanus) in the Snake River Birds of Prey National Conservation Area (NCA) from 1974-1997 to identify factors that influence abundance and reproduction. Our sampling period included two major droughts and associated crashes in Townsend's ground squirrel (Spermophilus townsendii) populations. The number...
Reproductive characteristics of migratory golden eagles in Denali National Park, Alaska
Carol L. McIntyre, Layne G. Adams
1999, The Condor (101) 115-123
We describe reproductive characteristics of Golden Eagles (Aquila chrysaetos) breeding in Denali National Park, Alaska during an entire snowshoe hare (Lepus americanus) cycle, 1988-1997. Data on nesting eagles were collected at 58 to 72 nesting areas annually using two aerial surveys. Surveys were conducted during the incubation period to determine...
Plasma steroid concentrations and male phallus size in juvenile alligators from seven Florida lakes
L.J. Guillette Jr., A.R. Woodward, D.A. Crain, D.B. Pickford, A. A. Rooney, H.F. Percival
1999, General and Comparative Endocrinology (116) 356-372
Neonatal and juvenile alligators from contaminated Lake Apopka in central Florida exhibit abnormal plasma sex steroid concentrations as well as morphological abnormalities of the gonad and phallus. This study addresses whether similar abnormalities occur in juvenile alligators inhabiting six other lakes in Florida. For analysis, animals were partitioned into two...
Effects of fire on golden eagle territory occupancy and reproductive success
Michael N. Kochert, Karen Steenhof, J.M. Marzluff, L.B. Carpenter
1999, Journal of Wildlife Management (63) 773-780
We examined effects of fire on golden eagle (Aquila chrysaetos) territory occupancy and reproductive success in southwestern Idaho because wildfires since 1980 have resulted in large-scale losses of shrub habitat in the Snake River Plain. Success (percentage of pairs that raised young) at burned territories declined after major fires (P...
Environmental characteristics associated with the occurrence of avian botulism in wetlands of a northern California refuge
Tonie E. Rocke, Ned H. Euliss Jr., Michael D. Samuel
1999, Journal of Wildlife Management (63) 358-368
Avian botulism is an important disease affecting many species of waterbirds in North America, but the environmental conditions that initiate outbreaks are poorly understood. To determine wetland attributes associated with outbreaks of avian botulism in waterbirds at the Sacramento National Wildlife Refuge (SNWR), California, we compared environmental characteristics between wetlands...
Population demographics and genetic diversity in remnant and translocated populations of sea otters
James L. Bodkin, Brenda E. Ballachey, M. A. Cronin, K.T. Scribner
1999, Conservation Biology (13) 1378-1385
The effects of small population size on genetic diversity and subsequent population recovery are theoretically predicted, but few empirical data are available to describe those relations. We use data from four remnant and three translocated sea otter ( Enhydra lutris) populations to examine relations among magnitude and duration of minimum population...
Discovery of a new Kittlitz's murrelet nest: Clues to habitat selection and nest-site fidelity
John F. Piatt, Nancy L. Naslund, Thomas I. van Pelt
1999, Northwestern Naturalist (80) 8-13
On 13 June 1993, a new Kittlitz's murrelet (Brachyramphus brevirostris) nest was discovered near Red Mountain on the Kenai Peninsula, Alaska. The nest was on a 22° slope at about 900 m elevation with a northeast aspect, and contained a 60.2 × 40.6 mm egg that weighed 49.0 g. Downy...
Puerto Rico – Hurricane Georges
Water Resources Division, U.S. Geological Survey
1999, Fact Sheet 040-99
Maturation, fecundity, and intertidal spawning of Pacific sand lance in the northern Gulf of Alaska
Martin D. Robards, John F. Piatt, G.A. Rose
1999, Journal of Fish Biology (54) 1050-1068
Pacific sand lance Ammodytes hexapterus in Kachemak Bay, Alaska, showed no sexual dimorphism in length-to-weight (gonad-free) ratio or length-at-age relationship. Most matured in their second year, males earlier in the season than females, but females (31%) attained a higher gonadosomatic index than males (21%). Sand lance spawned intertidally once each...
1:24,000-scale Hydrographic Areas for Humboldt River Basin, Nevada
Rose L. Medina
1999, Report
This data set contains the topographic and administrative hydrographic area boundaries for the Humboldt River Basin at 1:24,000-scale....
Survival potential of Cherry Point herring: Larval abnormalities and weight at hatch following in situ incubation of developing embryos
P.K. Hershberger, R. M. Kocan
1999, Report
Abstract not available ...
Habitat invasibility and dominance by alien annual plants in the western Mojave Desert
Matthew L. Brooks
1999, Biological Invasions (1) 325-337
Patterns of habitat invasibility and alien dominance, respectively measured as species richness and biomass of alien annual plants, were evaluated in association with four habitat factors at the Desert Tortoise Research Natural Area (DTNA) in the western Mojave Desert, USA. Habitat factors varied in levels of disturbance outside (high) and...
Concentrations and distribution of manmade organic compounds in the Lake Tahoe Basin, Nevada and California, 1997-99
Michael S. Lico, Nyle Pennington
1999, Water-Resources Investigations Report 99-4218
The U.S. Geological Survey, in cooperation with the Tahoe Regional Planning Agency and the Lahontan Regional Water-Quality Control Board, sampled Lake Tahoe, major tributary streams to Lake Tahoe, and several other lakes in the Lake Tahoe Basin for manmade organic compounds during 1997-99.Gasoline components were found in all samples collected...
