Publications
Filter Total Items: 1990
Parentage and relatedness in polyandrous comb-crested jacanas using ISSRs
In this article we present the first analysis of parentage and relatedness in a natural vertebrate population, using Intersimple Sequence Repeat (ISSR) markers. Thus, 28 ISSR markers were used in a study of a sex-role reversed, simultaneously polyandrous shorebird from northeastern Australia, the comb-crested jacana (Irediparra gallinacea). Assessment of parentage was based on comparison of field
Authors
Susan M. Haig, Terrence R. Mace, Thomas D. Mullins
The effect of stochiastic technique on estimates of population viability from transition matrix models
Population viability analysis is an important tool for conservation biologists, and matrix models that incorporate stochasticity are commonly used for this purpose. However, stochastic simulations may require assumptions about the distribution of matrix parameters, and modelers often select a statistical distribution that seems reasonable without sufficient data to test its fit. We used data from
Authors
T.N. Kaye, David A. Pyke
Habitat use by Swainson's Hawks on their austral winter grounds in Argentina
We examined the use of agricultural habitats by Swainson's Hawks (Buteo swainsoni)in La
Pampa and Santa Fe provinces, Argentina. We found an association of foraging Swainson's Hawks with permanent pastures such as fallow, natural, and alfalfa fields. The hawks also used plowed fields for sunning, resting, and preening. Fields planted with annual crops and pastures were used very little, except wh
Authors
Sonia B. Canavelli, Marc J. Bechard, B. Woodbridge, Michael N. Kochert, Juan J. Maceda, Maria E. Zaccagnini
Response of vegetation and breeding birds to the removal of cattle on the San Pedro River, Arizona (U.S.A.)
In late 1987 cattle were removed from the San Pedro Riparian National Conservation Area ( NCA ) in southeastern Arizona ( U.S.A. ). We monitored vegetation density and abundance of birds during the breeding season during 1986a??1990 in riparian, mesquite grassland, and Chihuahuan desert-scrub communities in the NCA. The density of herbaceous vegetation increased four- to six-fold in riparian and m
Authors
D. Krueper, Jonathan Bart, T. Rich
Processes and rates of sediment and wood accumulation in headwater streams of the Oregon Coast Range, USA
Channels that have been scoured to bedrock by debris flows provide unique opportunities to calculate the rate of sediment and wood accumulation in low-order streams, to understand the temporal succession of channel morphology following disturbance, and to make inferences about processes associated with input and transport of sediment. Dendrochronology was used to estimate the time since the previo
Authors
Christine L. May, Robert E. Gresswell
Effects of fire on fish populations: Landscape perspectives on persistance of native fishes and nonnative fish invasions
Our limited understanding of the short and long-term effects of fire on fish contributes to considerable uncertainty in assessments of the risks and benefits of fire management alternatives. A primary concern among the many potential effects of fire is the effects of fire and fire management on persistence of native fish populations. Limited evidence suggests vulnerability of fish to fire is conti
Authors
J. B. Dunham, M. Young, Robert E. Gresswell, B. Rieman
Organochlorine pesticides in eggs of brids of prey from the Stavropol Region, Russia
No abstract available.
Authors
Charles J. Henny, V.M. Galushin, Alexander N. Khokhlov, Ljubor V. Malovichko, M.P. Iijukh
A Framework for Long-term Ecological Monitoring in Olympic National Park: Prototype for the Coniferous Forest Biome
This report is the result of a five-year collaboration between scientists of the U.S. Geological Survey Forest and Rangeland Ecosystem Science Center, Olympic Field Station, and the natural resources staff of Olympic National Park to develop a comprehensive strategy for monitoring natural resources of Olympic National Park. Olympic National Park is the National Park Serviceʼs prototype monitoring
Authors
Kurt Jenkins, Andrea Woodward, Ed Schreiner
PRAIRIEMAP: A GIS database for prairie grassland management in western North America
The USGS Forest and Rangeland Ecosystem Science Center, Snake River Field Station (SRFS) maintains a database of spatial information, called PRAIRIEMAP, which is needed to address the management of prairie grasslands in western North America. We identify and collect spatial data for the region encompassing the historical extent of prairie grasslands (Figure 1). State and federal agencies, the prim
Authors
Range-wide conservation assessment of Greater Sage-Grouse and sagebrush habitats
Declining numbers of Greater Sage-grouse (Centrocercus urophasianus) over the past three decades across most of their range accompanied by increasing habitat degradation and loss represent major conservation and management challenges. We are conducting a range-wide Conservation Assessment of Greater Sage-grouse and sagebrush habitats. This assessment is an interagency effort sponsored by the Weste
Authors
Native salamanders and introduced fish: Changing the nature of mountain lakes and ponds
During the last century, many fishless mountain lakes and ponds in the Pacific Northwest were stocked with non-native fish, such as brook trout, for recreational purposes. These introduced fish replaced long-toed and northwestern salamander larvae as the top aquatic vertebrate predator by preying on salamander larvae. This predatory interaction has been shown to reduce the abundances of larval sal
Authors
Gary L. Larson, Robert L. Hoffman
The Amphibian Research and Monitoring Initiative in the Pacific Northwest
Amphibians have been disappearing from many locations around the world with reports of declines increasing in recent decades. Some of the most dramatic declines have occurred in areas that were thought to be protected from human disturbance. For example, the once-common boreal toad has virtually disappeared from Rocky Mountain National Park in Colorado. Although there has been debate on whether th
Authors
M. J. Adams