Publications
This list of publications includes peer-review journal articles, official USGS publications series, reports and more authored by scientists in the Ecosystems Mission Area. A database of all USGS publications, with advanced search features, can be accessed at the USGS Publications Warehouse.
Filter Total Items: 41758
Endangered Klamath suckers
Since Lost River suckers (Deltistes luxatus) and shortnose suckers (Chasmistes brevirostris) hatched in the early 1990s, almost none of the fish have survived to adulthood. When full grown, Lost River suckers are the largest of the Klamath suckers, averaging about two and a half feet long, whereas shortnose suckers are at around twenty-one inches. Rather than an inability to spawn, these species a
Authors
Summer M. Burdick
Using mercury stable isotope fractionation to identify the contribution of historical mercury mining sources present in downstream water, sediment and fish
Ecosystems downstream of mercury (Hg) contaminated sites can be impacted by both localized releases as well as Hg deposited to the watershed from atmospheric transport. Identifying the source of Hg in water, sediment, and fish downstream of contaminated sites is important for determining the effectiveness of source-control remediation actions. This study uses measurements of Hg stable isotopes in
Authors
Chris S. Eckley, Collin Eagles-Smith, Todd P Luxton, Joel C. Hoffman, Sarah E. Janssen
Decoupling of species and plant communities of the U.S. Southwest: A CCSM4 climate scenario example
Climate change is predicted to alter the current climate suitability under which plant species and communities occur. Predictions of change have focused on individual species or entire communities, but theory indicates plants will not respond uniformly to climate change within or between communities. We developed models of the current climate suitability (the baseline) of 66 plant species characte
Authors
Kathryn A. Thomas, Brett A. Stauffer, Christopher J. Jarchow
A comparison of direct & indirect survey methods for estimating colonial nesting waterbird populations
Population estimates derived from monitoring efforts can be sensitive to the survey method selected, potentially leading to biased estimates and low precision relative to true population size. While small unmanned aerial systems (UAS) present a unique opportunity to survey avian populations while limiting disturbance, relatively little is known about how this method compares with more traditional
Authors
Diann Prosser, Jeffery D. Sullivan, Christopher J. Gilbert, David F. Brinker, Peter C. McGowan, Carl R. Callahan, Ben Hutzell, Laurence E. Smith
Genetic diversity and IUCN Red List status
The International Union for Conservation of Nature (IUCN) Red List is an important and widely used tool for conservation assessment. The IUCN uses information about a species’ range, population size, habitat quality and fragmentation levels, and trends in abundance to assess extinction risk. Genetic diversity is not considered, although it affects extinction risk. Declining populations are more st
Authors
Chloe Schmidt, Sean M. Hoban, Maggie Hunter, Ivan Paz-Vinas, Colin J. Garroway
Declines in body size of sockeye salmon associated with increased competition in the ocean
Declining body sizes have been documented for several species of Pacific salmon; however, whether size declines are caused mainly by ocean warming or other ecological factors, and whether they result primarily from trends in age at maturation or changing growth rates remain poorly understood. We quantified changes in mean body size and contributions from shifting size-at-age and age structure of m
Authors
Jan Ohlberger, Timothy Joseph Cline, Daniel Schindler, Bert Lewis
A review of common natural disasters as analogs for asteroid impact effects and cascading hazards
Modern civilization has no collective experience with possible wide-ranging effects from a medium-sized asteroid impactor. Currently, modeling efforts that predict initial effects from a meteor impact or airburst provide needed information for initial preparation and evacuation plans, but longer-term cascading hazards are not typically considered. However, more common natural disasters, such as vo
Authors
Timothy N. Titus, D. G. Robertson, Joel B. Sankey, Larry G. Mastin, Francis K. Rengers
From bottom-up to top-down control of invertebrate herbivores in a retrogressive chronosequence
In the long-term absence of disturbance, ecosystems often enter a decline or retrogressive phase which leads to reductions in primary productivity, plant biomass, nutrient cycling and foliar quality. However, the consequences of ecosystem retrogression for higher trophic levels such as herbivores and predators, are less clear. Using a post-fire forested island-chronosequence across which retrogres
Authors
Anne Kempel, Eric Allan, Martin M. Gossner, Malte Jochum, James Grace, David A. Wardle
Stabilising effects of karstic groundwater on stream fish communities
Although groundwater exchange processes are known to modulate atmospheric influences on stream temperature and flow, the implications for ecological stability are poorly understood. Here, we evaluated temporal change in stream fish communities across a gradient of groundwater influence defined by karst terrain (carbonate parent materials) within the Potomac River basin of eastern North America. We
Authors
Nathaniel Hitt, Karli M Rogers, Karmann G. Kessler, Martin Briggs, Jennifer Burlingame Hoyle Fair
Sierra Nevada amphibians demonstrate stable occupancy despite precipitation volatility in the early 21st Century
Climate can have a strong influence on species distributions, and amphibians with different life histories might be affected by annual variability in precipitation in different ways. The Sierra Nevada of California, United States, experienced some of the driest and wettest years on record in the early 21st Century, with variability in annual precipitation predicted to increase with climate change.
Authors
Brian J. Halstead, Patrick M. Kleeman, Jonathan P. Rose, Gary M. Fellers
Do nurse plant effects strengthen over time? Results from 12 years of desert habitat restoration
Nurse plant effects occur when benefactor perennials facilitate beneficiary plants below their canopies. Two poorly understood aspects of nurse plant ecology include whether facilitation strengthens as nurse plants mature and whether reestablishing perennials through ecological restoration at disturbed sites can trigger facilitation akin to in natural plant communities. We examined these uncertain
Authors
Scott R. Abella, Lindsay P. Chiquoine, Mary A. Balogh, Adam J. Taylor, Seth M. Munson
A restructured Bayesian approach to estimate the abundance of a rare and invasive fish
Quantifying invasive species abundance informs management and control strategies. However, estimating abundance can be challenging, particularly when dealing with rare species early in the invasion process. Data generated from control strategies, such as removing invasive species, are usually not suited to conventional statistical modelling approaches. Hence, we developed a Bayesian model using da
Authors
Ana R. Gouveia, S. S. Qian, C. A. Mayer, J. A. Smith, J. Bossenbroek, W. D. Hintz, R. Mapes, E. Weimer, J. Navarro, J. M. Dettmers, R. Young, J. T. Buszkiewicz, Patrick M. Kočovský