Publications
Below is a list of WERC's peer-reviewed publications. If you are searching for a specific publication and cannot find it in this list, please contact werc_web@usgs.gov
Filter Total Items: 3617
Sunrise nest attendance and aggression by least Bell's vireos fail to deter cowbird parasitism
We video-recorded three, natural, brood-parasitism events by Brown-headed Cowbirds (Molothrus ater) at nests of Least Bell's Vireos (Vireo bellii pusillus). All instances occurred near dawn, during both egg-laying and incubation stages of the nesting cycle. In each case, an adult vireo was on the nest when the female cowbird arrived. Both members of each parasitized pair vigorously attacked the in
Authors
Bryan L. Sharp, Barbara E. Kus
Rana aurora draytonii (California red-legged frog) Predation
No abstract available.
Authors
Gary M. Fellers, Leslie Long Wood
Is predation on waterfowl nests density dependent? Tests at three spatial scales
We tested whether predation on duck nests (Anas spp.) was density dependent at three spatial scales using artificial and natural nests in the Suisun Marsh, California, USA. At the largest spatial scale, we used 5 years (1998–2002) of data to examine the natural variation in duck nest success and nest densities among 8–16 fields per year, each 5–33 ha in size (n=62 fields). At an intermediate spati
Authors
Joshua T. Ackerman, Alexis L. Blackmer, John M. Eadie
Differential spring migration by male and female Western Sandpipers at interior and coastal stopover sites
Western Sandpipers Calidris mauri are differential migrants on their non-breeding areas, with females wintering farther south. Earlier passage of males in the spring has been explained by sexual differences in winter latitude (male-biased sex ratios at more northerly areas) and onset of migration (males departing earlier). We investigated sex differences during spring migration by capturing and ra
Authors
Mary Anne Bishop, Nils Warnock, John Y. Takekawa
Saguaros Under Siege: Invasive Species and Fire
No abstract available.
Authors
T. C. Esque, C. R. Schwalbe, D.F. Haines, W. L. Halvorson
Reproductive success of the Black-crowned Night Heron at Alcatraz Island, San Francisco Bay, California, 1990-2002
Nesting chronology, habitat use, subcolony use, and hatchability were documented for the Black-crowned Night Heron (Nycticorax nycticorax) nesting at Alcatraz Island, San Francisco Bay, California during 1990-2002. Reproductive success was estimated using the Mayfield method and compared among years. Totals of monitored nests per year ranged from 68 in 2001 to 341 in 1996, with a trend of declinin
Authors
Roger L. Hothem, Daphne Hatch
Benefits and impacts of road removal
Road removal is being used to mitigate the physical and ecological impacts of roads and to restore both public and private lands. Although many federal and state agencies and private landowners have created protocols for road removal and priorities for restoration, research has not kept pace with the rate of removal. Some research has been conducted on hydrologic and geomorphic restoration followi
Authors
T.A. Switalski, J.A. Bissonette, T.H. DeLuca, C.H. Luce, Mary Ann Madej
Habitat selection by female northern pintails wintering in the Grassland Ecological Area, California
To determine relative importance of habitats available in the Grassland Ecological Area (GEA) to wintering female northern pintails, Anas acuta, we studied habitat use relative to availability (i.e., habitat selection) in the GEA during September through March, 1991-94 for 196 Hatch-Year (HY) and 221 After-Hatch-Year (AHY) female pintails that were radio tagged during August-early October in the G
Authors
Joseph P. Fleskes, David S. Gilmer, Robert L. Jarvis
Fishing for lobsters indirectly increases epidemics in sea urchins
Two ecological paradigms, the trophic cascade and the host-density threshold in disease, interact in the kelp-forest ecosystem to structure the community. To investigate what happens when a trophic cascade pushes a host population over a host-threshold density, I analyzed a 20-year data set of kelp forest communities at 16 sites in the region of the Channel Islands National Park, California, USA.
Authors
Kevin D. Lafferty
Using radiotelemetry to monitor cardiac response of free-living tule greater white-fronted geese (Anser albifrons elgasi) to human disturbance
We monitored the heart rates of free-living Tule Greater White-fronted Geese (Anser albifrons elgasi) during human disturbances on their wintering range in the Sacramento Valley of California during 1997. We used implanted radio transmitters to record the heart rates of geese as an observer experimentally approached them at a constant walking speed. On average, geese flushed when observers were 47
Authors
Joshua T. Ackerman, John Y. Takekawa, K.L. Kruse, D.L. Orthmeyer, J.L. Yee, Craig R. Ely, David H. Ward, Karen S. Bollinger, Daniel M. Mulcahy
Waterfowl migration on Klamath Basin National Wildlife Refuges 1953-2001:
No abstract available at this time
Authors
D.S. Gilmer, J.L. Yee, D.M. Mauser, J.L. Hainline
Science support for salt pond restoration and management in south San Francisco Bay
No abstract available.
Authors
Kathleen M. Swanson, Gregory Shellenbarger, Kathleen D. Henderson, Jeanne S. DiLeo, David H. Schoellhamer