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 viability. Additional wildlife crossings are needed to improve connectivity across the region. This assessment uses landscape characteristics and wildlife data to evaluate and prioritize possible locations and concepts for wildlife crossings along two major freeways that bisect regional wildlife movement, Interstate 15 at the Riversided-San Diego County border and U.S. 101 in northern Los Angeles County. By combining expert opinion and connectivity science, the authors aim to bridge the gap between science and conservation practice.
Sandi Matsumoto, Gregg Werner, Melissa Rohde, Kirk Klausmeyer
Groundwater dependent ecosystems (GDEs) are plant and animal communities that require groundwater to meet some or all of their water needs. GDEs provide important benefits to California including habitat for animals, water supply, water purification, flood mitigation, erosion control, recreational opportunities and enjoyment of California’s…
The author discusses a need for a new paradigm in fisheries management to address the challenges of a changing climate. See related publication by the author and colleagues in Conservation Letters.
Sean P. Fitzgerald, Jono R. Wilson , Hunter S. Lenihan
Despite the economic value of California fisheries, many lack information needed to determine if fishing is occurring at a sustainable level. The Southern California Rock Crab fishery in the Santa Barbara Channel is one such data-limited fishery that is currently managed through a state-wide size…
Rodd Kelsey, Abby Hart, H. Scott Butterfield, Dan Vink
Restoring habitat in retired farmland could reduce water demand and provide ecosystem services for farmers and local communities. In some areas of California, as a result of the Sustainable Groundwater Management Act (SGMA), it is likely that large amounts of agricultural land will need to…
Travis M. Hinkelman, Myfanwy Johnston, Joseph E. Merz, Julie Zimmerman
To restore degraded stream corridors and develop large-scale, sustainable watershed conservation strategies, it is essential for managers to consider—in order to ultimately re-establish—the habitat requirements of keystone species. For example, in order to restore salmon in the Central Valley of California, we need a clear…
Walter N. Heady, Brian S. Cohen, Mary G. Gleason, Joshua N. Morris, Sarah G. Newkirk, Kirk R. Klausmeyer, Hilary R. Walecka, Elizabeth Gagneron
Sea level rise presents a new challenge to coastal conservation. The authors quantified and mapped the vulnerability of habitats, imperiled species, and conservation lands to sea level rise throughout the entire California coast, where high biodiversity, high endemism, and 26.5 million people coincide. Combining habitat…
Chris Lortie, Alex Filazzola, Rodd Kelsey, Abigail Hart, Scott Butterfield
Over the past 100 years, California's Central Valley has undergone a massive transformation from desert to a mosaic of farmland and urban development. This transformation has also meant many desert species have lost habitat. Now, new groundwater regulations are calling for the retirement of more…
Alex Leumer, Carrie Schloss, Cara Lacey
Plants and animals lack the ability to change their environment. As their current habitat becomes unsuitable due to climate change, they may search out new, more suitable habitat to adapt to changing conditions. With limited resources for protecting additional lands, the conservation community must protect…
Sarah Heard, E.J. Remson, Siobhan King, Sandi Matsumoto
The Conservancy has a vested interest in preserving farms in Ventura County because they buffer important river and wetland habitat from nearby urban lands. In western Ventura County, over 70% of groundwater use is agricultural. Due to requirements of the Sustainable Groundwater Management Act (SGMA), this use will…
Matthew E. Reiter, Nathan K. Elliott, Dennis Jongsomjit, Gregory H. Golet, Mark D. Reynolds
In the Central Valley of California, with 90% of the historic wetlands gone, waterbirds depend upon managed wetlands and seasonally flooded agriculture to meet their habitat needs. The 2013-2015 drought in the Central Valley was more severe than drought years during 2000-2011 and reduced waterbird…
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…
Mario B. Pesendorfer, Christopher M. Baker, Martin Stringer, Eve McDonald‐Madden, Michael Bode, A. Kathryn McEachern, Scott A. Morrison, T. Scott Sillett
A key aim of conservation is to restore ecological processes to degraded ecosystems. This study models how reintroducing an ecosystem engineer – the island scrub-jay, which is a highly efficient seed disperser – to a degraded island ecosystem could accelerate the recovery of its oak…
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.…
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…
Prepared by Andrew Zdon & Associates Inc. for Transition Habitat Conservancy, The Bureau of Land Management, and The Nature Conservancy
The Mojave Desert within California, which spans four counties, exists as one of the most important ecological regions in the southwestern United States. Both the groundwater and surface water in the region support isolated, unique and diverse ecosystems, while also supporting human needs through domestic,…
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…
The Conservancy’s Omniscape tool provides a connectivity roadmap for plants and animals that need to adapt as the climate warms.
