Products

We identify issues and uncertainties that pose obstacles to conservation and then—in collaboration with internal and external colleagues—develop science products that help overcome those obstacles.

2018 | Freshwater | Terrestrial | Planning | Science | Publications & Reports

Water Supply and Habitat Resiliency for a Future Los Angeles River: Site-Specific Natural Enhancement Opportunities Informed by River Flow and Watershed-Wide Action

Brian Cohen, Shona Ganguly, Sophie Parker, John Randall, Jill Sourial, and Lara Weatherly of The Nature Conservancy, Land IQ, Natural History Museum Los Angeles County, WRC Consulting Services Inc., Travis Longcore, University of Southern California, Connective Issue, Inc.

As a basic principle of ecological systems, a watershed’s hydrology determines the flow characteristics of its river system. These flows define what the biological characteristics of that river will be, which in turn determine what kinds of habitat enhancement projects will succeed at various locations along…


2018 | Freshwater | Terrestrial | Planning | Science | Publications & Reports

Ecological spillover dynamics of organisms from urban to natural landscapes

Jill E. Spear, Erik K. Grijalva, Julia S. Michaels, Sophie S. Parker

This paper discusses the impact of urban-dwelling plants and animals on regional wildland populations, both within and across species. The authors reviewed the global conservation literature and identified seven ecological processes that have the potential to be affected by spillover from urban to wildland areas.…


2018 | Freshwater | Planning | Publications & Reports

A freshwater conservation blueprint for California: prioritizing watersheds for freshwater biodiversity

Jeanette K. Howard, Kurt A. Fesenmyer, Theodore E. Grantham, Joshua H. Viers, Peter R. Ode, Peter B. Moyle, Sarah J. Kupferburg, Joseph L. Furnish, Andrew Rehn, Joseph Slusark, Raphael D. Mazor, Nicholas R. Santos, Ryan A. Peek, Amber N. Wright

Freshwater ecosystems are in peril globally. Threats to freshwater biodiversity are numerous and include habitat degradation, pollution, overexploitation, dam construction, species invasion, and hydroclimatic change. With conservation resources often limited, prioritization tooks are needed by land and water managers. To fill this need, the authors…


2018 | Freshwater | Terrestrial | Planning | Science | Publications & Reports

Ecological Values of the Amargosa River in California

Sophie S. Parker, Jim Moore, Leonard Warren

The 185 mile-long Amargosa River, one of only two rivers with perennial flow in the California portion of the Mojave Desert, is fed by an ancient groundwater aquifer. The river provides habitat for hundreds of organisms, including a unique suite of rare, endemic, and imperiled…


2018 | Terrestrial | Planning | Science | Science in Action

Connectivity Roadmap: Can we identify areas where nature will need to migrate in response to climate change?

Dick Cameron, Carrie Schloss

The Conservancy’s Omniscape tool provides a connectivity roadmap for plants and animals that need to adapt as the climate warms.


2018 | Terrestrial | Planning | Science | Publications & Reports

Assessment of Wildlife Crossing Sites for the Interstate 15 and Highway 101 Freeways in Southern California

Seth P. D. Riley, Trish Smith, T. Winston Vickers

Freeways are barriers to wildlife passage and gene exchange. In Southern California, mountain lion movement has been severely restricted due to this infrastructure. As a result, the mountain lions in the Santa Ana and Santa Monica  Mountains have become severely inbred, threatening their long-term health and…


2018 | Freshwater | Terrestrial | Planning | Science | Publications & Reports

Harnessing cross-border resources to confront climate change

Aburto-Oropeza, O., M. Edwards, S. Butterfield, and 93 additional authors

The U.S. and Mexico face many shared ecological changes due to the increased frequency and severity of droughts and rising energy demands; trends that entail economic costs for both nations and major implications for human well-being. This paper synthesizes current knowledge about the most pressing issues…


2018 | Terrestrial | Planning | Science | Publications & Reports

Adapting the bioblitz to meet conservation needs

Parker, S.S., B.V. Brown, B.S. Cohen, N.S. Fraga, J.J. Knapp, Z. Principe, J. Moore, G.B. Pauly, J.M. Randall, T.A. Wake

A bioblitz is a collaborative, rapid field assessment that takes place in a given location over a short period of time. This paper discusses how bioblitz events involving experts are being used to meet the needs of conservation. The authors discuss the best practices for…


2017 | Freshwater | Terrestrial | Planning | Publications & Reports

Identification of potentially suitable habitat for strategic land retirement and restoration in the San Joaquin Desert

H. Scott Butterfield, Rodd Kelsey, Abigail Hart, Tanushree Biswas, Mark Kramer, Dick Cameron, Laura Crane, Erica Brand

California's Sustainable Groundwater Management Act (SGMA) established a framework for sustainable, local groundwater management. SGMA requires groundwater-dependent regions to halt overdraft and bring basins into balanced levels of pumping and recharge. As a result, agricultural land retirement is on the rise in the San Joaquin Valley, California’s largest agricultural region and home to…


2017 | Freshwater | Terrestrial | Planning | Publications & Reports

Rethinking the Grid: Optimizing California’s Transmission System For Renewable Energy

Energy+Environmental Economics for The Nature Conservancy, Arne Olson, Doug Allen, Vivian Li, Emily Leslie

California leads the nation in the transition to a clean energy economy. However, current transmission planning processes limit development of new renewable resources. This report (slide deck), produced for the Conservancy by Energy+Environmental Economics, analyzes an alternative transmission planning framework (Energy-Only) using the San Joaquin Valley as…


2017 | Terrestrial | Planning | Publications & Reports

Regional Prioritization for Forest Restoration across California's Sierra Nevada

Rodd Kelsey, Edward Smith, Tanushree Biswas, Chris McColl, Kristen Wilson, Dick Cameron

This report provides a systematic regional-scale assessment of biodiversity, fire regime change, and fire risk to infrastructure of forested watersheds across the Sierra Nevada and prioritizes watersheds for forest restoration where the greatest risk reduction to biodiversity and human infrastructure can be achieved. For priority…


2017 | Terrestrial | Planning | Publications & Reports

Quantifying Trade-Offs Among Ecosystem Services, Biodiversity, and Agricultural Returns in an Agriculturally Dominated Landscape Under Future Land‑Management Scenarios

Emma C. Underwood, Rachel A. Hutchinson, Joshua H. Viers, T. Rodd Kelsey, Trisha Distler, Jaymee Marty

This paper discusses and provides modeled estimates of the biodiversity and ecosystem service outcomes of three different future land use scenarios, compared to current land uses, in a cultivated landscape of the Central Valley in California. Specifically, it quantifies the impacts to greenhouse gas emissions,…


2017 | Terrestrial | Planning | Microsite

The Bay Area Greenprint

Carrie Schloss, Elizabeth O'Donoghue, Christa Cassidy, Tom Robinson, Serena Unger, Adam Garcia, Dan Rademacher

The Bay Area Greenprint tool provides land use and infrastructure agencies, consultants, and advocates easily accessible, interpretable, and scientifically robust information on habitat and ecosystem service values in the Bay Area. Currently, natural and agricultural lands are not considered early enough in planning processes leading…


2017 | Terrestrial | Planning | Publications & Reports

Solar Energy Development and Regional Conservation Planning

D.R. Cameron, L. Crane, S.S. Parker, J.M. Randall

This book chapter discusses how California's greenhouse gas emission reduction goals spurred solar development in the Mojave Desert—development that could have negative impacts if poorly sited. The authors discuss their wall-to-wall assessment of conservation values across the 32-million-acre Mojave Desert, and their estimation of…


2017 | Freshwater | Planning | Science | Publications & Reports

A Global Synthesis of Managing Groundwater Dependent Ecosystems Under Sustainable Groundwater Policy

Melissa M. Rohde, Ray Froend, Jeanette Howard

Groundwater is a vital water supply worldwide for people and nature. However, species and ecosystems that depend on groundwater for some or all of their water needs, known as groundwater dependent ecosystems (GDEs), are increasingly becoming threatened worldwide. This paper provides an overview of how…


2017 | Freshwater | Terrestrial | Planning | Science | Publications & Reports

Population and habitat objectives for avian conservation in California’s Central Valley riparian ecosystems

Kristen E. Dybala, Neil Clipperton, Thomas Gardali, Gregory H. Golet, Rodd Kelsey, Stefan Lorenzato, Ron Melcer, Jr., Nathaniel E. Seavy, Joseph G. Silveira

The Conservancy and partners are working to establish riparian ecosystems that provide sufficient habitat to support genetically robust, self-sustaining, and resilient bird populations in California's Central Valley. In this study, researchers selected 12 riparian landbird focal species as indicators of riparian ecosystem health and are…


2017 | Terrestrial | Planning | Science | Publications & Reports

A General Framework for Setting Quantitative Population Objectives for Wildlife Conservation

Kristen E. Dybala, Neil Clipperton, Thomas Gardali, Gregory H. Golet, Rodd Kelsey, Stefan Lorenzato, Ronald Melcer, Jr., Nathaniel Seavy, Joseph G. Silveira, Gregory S. Yarris

Quantitative population objectives are necessary to achieve conservation goals of secure or robust wildlife populations, however, existing methods for setting them often require extensive species population viability data, which are often unavailable. This paper presents an alternative method that uses key milestones a population would be expected to…