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Threat evolution: negative feedbacks between management actions and species recovery in threatened trout (Salmonidae)

Robert Lusardi Molly R., Stephens Peter Moyle Christy L., Mcguire Josh M., Hull

Published in Reviews in Fish Biology and Fisheries

Resource managers are often presented with dilemmas that require immediate action to avoid species extinction, but that also ensure species long-term persistence. These objectives may conflict with one another, resulting in new threats as initial threats are ameliorated. Such threat evolution is a common pattern in the long history of efforts to co...

Instream flows: new tools to quantify water quality conditions for returning adult Chinook salmon PDF available through Get Fulltext Research

Ann Willis Campbell, Amy M Fowler, Ada C Babcock, Christopher A Howard, Jeanette K Deas, Michael Andrew Nichols

Published in Journal of Water Resources Planning and Management

This paper examines the effect of implementing a water transaction program to address potential water quality limitations for returning adult fall-run Chinook salmon in a stream system where the agriculture is the dominant land and water use. Water transactions are becoming an increasingly used approach to provide instream flows during periods when...

What If Californias Drought Continues?

Hanak, Ellen Jeffrey Mount Chappelle, Caitrin Jay Lund Josué Medellín-Azuara Peter Moyle Seavy, Nathaniel

California is in the fourth year of a severe, hot droughtthe kind that is increasingly likely as the climate warms. Although no sector has been untouched, impacts so far have varied greatly, reflecting different levels of drought preparedness. Urban areas are in the best shape, thanks to sustained investments in diversified water portfolios and con...

Functional Flows in Modified Riverscapes: Hydrographs, Habitats and Opportunities

Sarah Yarnell Petts, Geoffrey Schmidt, John Alison Whipple Beller, Erin Dahm, Clifford Goodwin, Peter Joshua Viers

Published in BioScience

Building on previous environmental flow discussions and a growing recognition that hydrogeomorphic processes are inherent in the ecological functionality and biodiversity of riverscapes, we propose a functional-flows approach to managing heavily modified rivers. The approach focuses on retaining specific process-based components of the hydrograph, ...

Economic Analysis of the 2015 Drought for California Agriculture

Richard Howitt Macewan, Duncan Josué Medellín-Azuara Jay Lund Sumner, Daniel

The drought is tightening its grip on California agriculture, squeezing about 30 percent more workers and cropland out of production than in 2014, according to the latest drought impact report by the UC Davis Center for Watershed Sciences. In 2015, the states agricultural economy directly will lose about 1.84 billion and 10,100 jobs because of the ...

Patterns of Freshwater Species Richness, Endemism, and Vulnerability in California PDF available through Get Fulltext Research

Jeanette, Howard Kirk, Klausmeyer Joseph, Furnish Thomas, Gardali Theodore E, Grantham Jacob, Katz Sarah, Kupferberg Patrick, Macintyre Peter Moyle Peter, Ode ...

Published in PLoS ONE

The ranges and abundances of species that depend on freshwater habitats are declining worldwide. Efforts to counteract those trends are often hampered by a lack of information about species distribution and conservation status and are often strongly biased toward a few well-studied groups. We identified the 3,906 vascular plants, macroinvertebrates...

Hydro-economic analysis of groundwater pumping for irrigated agriculture in California’s Central Valley, USA

Medellín-Azuara, Josué MacEwan, Duncan Howitt, Richard E. Koruakos, George Dogrul, Emin C. Brush, Charles F. Kadir, Tariq N. Harter, Thomas Melton, Forrest Lund, Jay R. ...

Published in Hydrogeology Journal

As in many places, groundwater in California (USA) is the major alternative water source for agriculture during drought, so groundwater’s availability will drive some inevitable changes in the state’s water management. Currently, agricultural, environmental, and urban uses compete for groundwater, resulting in substantial overdraft in dry years wit...

Economics of the Drought for California Food and Agriculture

Sumner, Daniel Hanak, Ellen Jeffrey Mount Josué Medellín-Azuara Macewan, Duncan Jay Lund Richard Howitt

The extreme drought that has gripped California over the past several years is causing onerous adjustments in the natural and human environments. Agriculture, which uses much of the states water, is at the center of many of these arduous responses. The 2015 impacts of the continuing drought are still underway, but in this special ARE Update issue, ...

Ten ways U.S. agencies and Congress can help ease the drought in California and other western states

Hanak, Ellen Jeffrey Mount Chappelle, Caitrin Richard Frank Jay Lund Peter Moyle Gartrell, Greg Gray, Brian Thompson, Buzz

Decision Support Tool for Water Management and Environmental Flows: Mill Creek Case Study

Ta, Jenny

Stream flow drives many physical and ecological processes in rivers that support freshwater ecosystems. Human activities like dam operations, water diversions, and flood control infrastructure together have fundamentally altered many streams. Water scarcity from increasing water demands and prolonged droughts has further stressed freshwater ecosyst...

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