Publications
Filter Total Items: 1990
Resource manager information needs regarding hydrologic regime shifts for the North Pacific Landscape Conservation
Landscape Conservation Cooperatives (LCCs) are a network of 22 public-private partnerships, defined by ecoregion, that share and provide science to ensure the sustainability of land, water, wildlife, and cultural resources in North America. LCCs were established by the U.S. Department of the Interior (DOI) in recognition of the fact that response to climate change must be coordinated on a landscap
Authors
Andrea Woodward, Karen Jenni
Calcium oxalate contribution to calcium cycling in forests of contrasting nutrient status
Calcium oxalate (Ca oxalate) is an insoluble biomineral that forms in plants and fungi, and occurs in soils across many types of ecosystems. Assessing how Ca oxalate may shape ecosystem Ca cycling requires information on the distribution of Ca oxalate among plant biomass, detritus, and mineral soil, and how it varies with ecosystem Ca status. We compared two Douglas-fir forests of contrasting ecos
Authors
Jenny M. Dauer, Steven S. Perakis
Wetland management and rice farming strategies to decrease methylmercury bioaccumulation and loads from the Cosumnes River Preserve, California
We evaluated mercury (Hg) concentrations in caged fish (deployed for 30 days) and water from agricultural wetland (rice fields), managed wetland, slough, and river habitats in the Cosumnes River Preserve, California. We also implemented experimental hydrological regimes on managed wetlands and post-harvest rice straw management techniques on rice fields in order to evaluate potential Best Manageme
Authors
Collin A. Eagles-Smith, Joshua T. Ackerman, Jacob Fleck, Lisamarie Windham-Myers, Harry McQuillen, Wes Heim
Temporal variation in fish mercury concentrations within lakes from the western Aleutian Archipelago, Alaska
We assessed temporal variation in mercury (Hg) concentrations of threespine stickleback (Gasterosteus aculeatus) from Agattu Island, Aleutian Archipelago, Alaska. Total Hg concentrations in whole-bodied stickleback were measured at two-week intervals from two sites in each of two lakes from June 1 to August 10, 2011 during the time period when lakes were ice-free. Across all sites and sampling eve
Authors
Leah A. Kenney, Collin A. Eagles-Smith, Joshua T. Ackerman, Frank A. von Hippel
Mercury bioaccumulation in estuarine wetland fishes: Evaluating habitats and risk to coastal wildlife
Estuaries are globally important areas for methylmercury bioaccumulation because of high methylmercury production rates and use by fish and wildlife. We measured total mercury (THg) concentrations in ten fish species from 32 wetland and open bay sites in San Francisco Bay Estuary (2005–2008). Fish THg concentrations (μg/g dry weight ± standard error) differed by up to 7.4× among estuary habitats.
Authors
Collin A. Eagles-Smith, Joshua T. Ackerman
Resource partitioning in two stream salamanders, Dicamptodon tenebrosus and Rhyacotriton cascadae, from the Oregon Cascade Mountains
We investigated the potential for resource partitioning between the Coastal giant salamander (Dicamptodon tenebrosus) and the Cascade torrent salamander (Rhyacotriton cascadae) by examining their diet and microhabitats in forest streams. Larval D. tenebrosus and R. cascadae fed primarily upon aquatic insect larvae. We found similar foods in larval and adult R. cascadae and combined these results.
Authors
Wynn W. Cudmore, R. Bruce Bury
Mercury in fishes from Wrangell-St. Elias National Park and Preserve, Alaska
In this study, mercury (Hg) concentrations were examined in fishes from Wrangell-St. Elias National Park and Preserve, Alaska, the largest and one of the most remote units in the national park system. The goals of the study were to (1) examine the distribution of Hg in select lakes of Wrangell-St. Elias National Park and Preserve; (2) evaluate the differences in Hg concentrations among fish specie
Authors
Brandon M. Kowalski, James J. Willacker, Christian E. Zimmerman, Collin A. Eagles-Smith
The persistent problem of lead poisoning in birds from ammunition and fishing tackle
Lead (Pb) is a metabolic poison that can negatively influence biological processes, leading to illness and mortality across a large spectrum of North American avifauna (>120 species) and other organisms. Pb poisoning can result from numerous sources, including ingestion of bullet fragments and shot pellets left in animal carcasses, spent ammunition left in the field, lost fishing tackle, Pb-based
Authors
Susan M. Haig, Jesse D'Elia, Collin A. Eagles-Smith, Jeanne M. Fair, Jennifer Gervais, Garth Herring, James W. Rivers, John H. Schulz
Three-year growth response of young Douglas-fir to nitrogen, calcium, phosphorus, and blended fertilizers in Oregon and Washington
Studies of nutrient limitation in Douglas-fir forests of the Pacific Northwest focus predominantly on nitrogen, yet many stands demonstrate negligible or even negative growth response to nitrogen fertilization. To understand what nutrients other than nitrogen may limit forest productivity in this region, we tested six fertilizer treatments for their ability to increase stem volume growth response
Authors
Douglas B. Mainwaring, Douglas A. Maguire, Steven S. Perakis
Users' guide to system dynamics model describing Coho salmon survival in Olema Creek, Point Reyes National Seashore, Marin County, California
The system dynamics model described in this report is the result of a collaboration between U.S. Geological Survey (USGS) scientists and National Park Service (NPS) San Francisco Bay Area Network (SFAN) staff, whose goal was to develop a methodology to integrate inventory and monitoring data to better understand ecosystem dynamics and trends using salmon in Olema Creek, Marin County, California, a
Authors
Andrea Woodward, Alicia Torregrosa, Mary Ann Madej, Michael Reichmuth, Darren Fong
Birds of a feather
Greater sage-grouse (Centrocercus urophasiunus, hereafter sage-grouse) are broadly distributed, occupy a diversity of sagebrush habitats, and face multiple threats. As a result of these threats, sage-grouse populations are declining and are now absent from almost one-half of their estimated range prior to Euro-American settlement. The risks to sage-grouse are significant enough to merit candidate
Authors
Steven T. Knick, Carmen Gondhaleker
Thresholds for protecting Pacific Northwest ecosystems from atmospheric deposition of nitrogen: state of knowledge report
The National Park Service and U.S. Forest Service manage areas in the states of Idaho, Oregon, and Washington – collectively referred to in this report as the Pacific Northwest - that contain significant natural resources and provide many recreational opportunities. The agencies are mandated to protect the air quality and air pollution-sensitive resources on these federal lands. Human activity h
Authors
Tonnie Cummings, Tamara Blett, Ellen Porter, Linda Geiser, Rick Graw, Jill McMurray, Steven S. Perakis, Regina Rochefort