Robert N Fisher
Biography
Dr. Robert Fisher is a conservation biologist with the US Geological Survey’s Western Ecological Research Center and works as part of a large integrated team. His focus has been on how natural systems are responding to the Anthropocene, and what types of resiliency they have or lack as it relates to maintaining ecological integrity and biodiversity. Additionally, through understanding individual species and community responses to perturbations through modern monitoring techniques, he and his team can determine appropriate management experiments or options to possibly recover resiliency. Geographically they have two foci, the first is southern California where urbanization and conservation planning bring various direct and indirect drivers of ecological change, and climate variability is currently extreme and drives landscape level drought and wildfires. Their second foci are the tropical islands of the Pacific Basin, from Palau and Papua New Guinea east to Hawai’i. These islands have also been driven by human change and are on the front line as extreme recent weather variability in the cyclone belt impact terrestrial ecosystems. Understanding how biodiversity was generated in this ecoregion is critical to managing its loss, and their team focuses across time and space (biogeography) to understand these processes utilizing molecular tools tied to expeditions of discovery in this poorly studied ecoregion.
EDUCATION
- Ph.D., Population Biology, University of California, Davis, CA 1995
- M.S., Zoology, University of California, Davis, CA 1991
- B.S., Biology, University of California, Irvine, CA 1988
RESEARCH INTERESTS
- Conservation biology
- Biogeography
- Modelling
- Natural history
- Speciation
- Invasive species
- Climate variability
- Anthropocene
Science and Products
WERC Fire Science
WERC scientists are defining the past, present, and future of wildfires for wildlife and human communities. Explore this webpage to learn about specific, ongoing projects across California and parts of Nevada.
Amphibian Research in Southern California
Amphibian populations have declined in many areas around the world. Initially, there was skepticism as to whether the observed declines were merely minor population fluctuations, but it has become increasingly clear that many declines are both real and sustained. At the request of the U.S. Department of the Interior, USGS Western Ecological Research Center (WERC) scientists are supporting the...
Golden Eagles in Coastal Southern California
The status of the golden eagle (Aquila chrysaetos) in coastal southern California is unclear. To address this knowledge gap, Dr. Robert Fisher in collaboration with local, State and other Federal agencies begin a multi-year survey and tracking program of golden eagles to address questions regarding habitat use, movement behavior, nest occupancy, genetic population structure, and human impacts...
Reptile Biodiversity in the Pacific Basin Islands
Dr. Robert Fisher and his colleagues have teamed up with the U.S. Fish and Wildlife, The Nature Conservancy and multiple universities to conduct several types of studies that will address high priority issues related to reptiles in the Pacific Basin Islands. These studies will provide new information about species diversity, endemicity, biology and demography of reptile fauna and will lay the...
San Diego Field Station
The San Diego Field Station is the site of research on golden eagles, endangered amphibians and reptiles, and more. Click on the "Science" tab for a comprehensive summary of this study site's projects.
Elucidating mechanisms underlying amphibian declines in North America using hierarchical spatial models
Amphibian populations are declining globally at unprecedented rates but statistically rigorous identification of mechanisms is lacking. Identification of reasons underlying large-scale declines is imperative to plan and implement effective conservation efforts. Most research on amphibian population decline has focused on local populations and local factors. However, the ubiquity of declines...
Amphibian responses in the aftermath of extreme climate events
Climate change-induced extinctions are estimated to eliminate one in six known species by the end of the century. One major factor that will contribute to these extinctions is extreme climatic events. Here, we show the ecological impacts of recent record warm air temperatures and simultaneous peak drought conditions in California. From 2008–2016,...
Bucciarelli, Gary M.; Clark, Morgan; Delaney, Katy S.; Riley, Seth P D; Shaffer, H Bradley; Fisher, Robert N.; Honeycutt, Rodney L; Kats, Lee B. Introgression obscures lineage boundaries and phylogeographic history in the western banded gecko, Coleonyx variegatus (Squamata: Eublepharidae)
The geomorphological formation of the Baja California peninsula and the Gulf of California is a principal driver of diversification for the reptiles of North America’s warm deserts. The western banded gecko, Coleonyx variegatus, is distributed throughout the Mojave, Sonoran and Peninsular deserts. In this study we use multilocus sequence data...
Leavitt, Dean H; Hollingsworth, Bradford; Fisher, Robert N.; Reeder, Tod W Integrating multiple data sources and multi-scale land-cover data to model the distribution of a declining amphibian
Determining the spatial scale at which landscape features influence population persistence is an important task for conservation planning. One challenge is that sampling biases confound factors that influence species occurrence and survey effort. Recent developments in Point Process Models (PPMs) enable researchers to disentangle the sampling...
Rose, Jonathan P.; Halstead, Brian J.; Fisher, Robert N. Urbanization reduces genetic connectivity in bobcats (Lynx rufus) at both intra- and interpopulation spatial scales
Urbanization is a major factor driving habitat fragmentation and connectivity loss in wildlife. However, the impacts of urbanization on connectivity can vary among species and even populations due to differences in local landscape characteristics, and our ability to detect these relationships may depend on the spatial scale at which they are...
Kozakiewicz, Christpher P.; Burridge, Christopher P.; Funk, W. Chris; Salerno, Patricia E.; Trumbo, Daryl R.; Gagne, Roderick B.; Boydston, Erin E.; Fisher, Robert N.; Lyren, Lisa M.; Jennings, Megan K.; Riley, Seth P. D.; Serieys, Laurel E.K.; VandeWoude, Sue; Crooks, Kevin R.; Carver, Scott
Track tube construction and field protocol for small mammal surveys with emphasis on the endangered Pacific pocket mouse (Perognathus longimembris pacificus)
Track tubes are used to identify small animals by their tracks. Animals that are small enough to fit into the tubes walk over ink pads and onto cardstock paper to obtain bait within the tube, leaving their footprints. The tracking tubes described in this document are designed to be set on the ground with free access and exit at either end with...
Brehme, Cheryl S.; Matsuda, Tritia A.; Adsit-Morris, Devin T.; Clark, Denise R.; Sebes, Jeremy B.; Burlaza, Melanie Anne T.; Fisher, Robert N. Community-based conservation and recovery of native species on Monuriki Island, Fiji
The small uninhabited island of Monuriki (40.4 ha) in western Fiji is of national and international conservation concern for its several protected species. Exotic invasive species and a Category 5 cyclone have exacerbated conservation challenges. The cooperation of local, national, and international stakeholders continues to be crucial in...
Fisher, Robert N.; Niukula, Jone; Harlow, Peter S.; Rasalato, Sia; Chand, Ramesh; Thaman, Baravi; Seniloli, Elenoa; Vadada, Joeli; Cranwell, Steve; Brown, J. Jed; Lovich, Kim; Thomas-Moko, Nunia Effect of amphibian chytrid fungus (Batrachochytrium dendrobatidis) on apparent survival of frogs and toads in the western USA
Despite increasing interest in determining the population-level effects of emerging infectious diseases on wildlife, estimating effects of disease on survival rates remains difficult. Even for a well-studied disease such as amphibian chytridiomycosis (caused by the fungus Batrachochytrium dendrobatidis [Bd]), there are few estimates of...
Russell, Robin E.; Halstead, Brian J.; Mosher, Brittany; Muths, Erin L.; Adams, Michael J.; Campbell Grant, Evan H.; Fisher, Robert N.; Kleeman, Patrick M.; Backlin, Adam R.; Pearl, Christopher; Honeycutt, R. Ken; Hossack, Blake R. Habitat preference modulates trans-oceanic dispersal in a terrestrial vertebrate
The importance of long-distance dispersal (LDD) in shaping geographical distributions has been debated since the nineteenth century. In terrestrial vertebrates, LDD events across large water bodies are considered highly improbable, but organismal traits affecting dispersal capacity are generally not taken into account. Here, we focus on a recent...
Blom, Mozes P.K.; Matzke, Nicholas J; Bragg, Jason G; Arida, Evy; Austin, Christopher C; Backlin, Adam R.; Carretero, Miguel A; Fisher, Robert N.; Glaw, Frank; Hathaway, Stacie A.; Iskandar, Djoko T; McGuire, Jimmy A; Karin, Benjamin R; Reilly, Sean B; Rittmeyer, Eric N; Rocha, Sara; Sanchez, Mickael; Stubbs, Alexander L; Vences, Miguel; Moritz, Craig Topographic drivers of flight altitude over large spatial and temporal scales
Bird movements vary spatially and temporally, but the primary drivers that explain such variation can be difficult to identify. For example, it is well known that the availability of updraft influences soaring flight and that topography interacts with weather to produce these updrafts. However, the influences of topography on flight are not well...
Duerr, Adam E.; Miller, Tricia A.; Dunn, Leah; Bell, Douglas A.; Bloom, Peter H.; Fisher, Robert N.; Tracey, Jeff A.; Katzner, Todd E. Globally important islands where eradicating invasive mammals will benefit highly threatened vertebrates
Invasive alien species are a major threat to native insular species. Eradicating invasive mammals from islands is a feasible and proven approach to prevent biodiversity loss. We developed a conceptual framework to identify globally important islands for invasive mammal eradications to prevent imminent extinctions among highly threatened species...
Holmes, Nick D.; Spatz, Dena R.; Oppel, Steffen; Tershy, Bernie; Croll, Donald; Keitt, Brad; Genovesi, Piero; Burfield, Ian; Will, David J.; Bond, Alexander L.; Wegmann, Alex; Aguirre-Munoz, Alfonso; Raine, Andre F.; Knapp, Charles R.; Hung, Chung-Hang; Wingate, David; Hagen, Erin; Mendez-Sanchez, Federico; Rocamora, Gerard; Yuan, Hsiao-Wei; Fric, Jakob; Millett, James; Russell, James M.; Liske-Clark, Jill; Vidal, Eric; Jourdan, Herve; Campbell, Karl; Springer, Keith; Swinnerton, Kristy; Gibbons-Decherong, Lolita; Langrand, Olivier; de L. Brooke, M.; McMinn, Miguel; Bunbury, Nancy; Oliveira, Nuno; Sposimo, Paolo; Geraldes, Pedro; McClelland, Pete; Hodum, Peter; Ryan, Peter G.; Borroto-Paez, Rafael; Pierce, Ray J.; Griffiths, Richard; Fisher, Robert N.; Wanless, Ross M.; Pasachnik, Stesha A.; Cranwell, Steve; Micol, Thierry; Butchart, Stuart H. M. Assessing effects of nonnative crayfish on mosquito survival
Introductions of nonnative predators often reduce biodiversity and affect natural predator–prey relationships and may increase the abundance of potential disease vectors (e.g., mosquitoes) indirectly through competition or predation cascades. The Santa Monica Mountains (California, U.S.A.), situated in a global biodiversity hotspot, is an area of...
Bucciarelli, Gary M.; Suh, Daniel; Davis Lamb, Avery; Roberts, Dave; Sharpton, Debra; Shaffer, H. Bradley; Fisher, Robert N.; Kats, Lee B. The Introduced Argentine ant (Linepithema humile) on the California Channel Islands: Distribution and Patterns of Spread
The Argentine ant (Linepithema humile) is a widespread and abundant introduced species that disrupts ecosystems throughout its introduced range. This invader was inadvertently introduced to Santa Catalina, San Clemente, Santa Cruz, and San Nicolas Islands at various points during the past century but currently appears to be absent from the...
Boser, Christina L.; Merrell, Korie; Fisher, Robert N.; Naughton, Ida; Holway, David ALiving with Fire: The USGS Southern California Wildfire Risk Project
Southern California's fire ecology is unlike that of anywhere else in the United States. Fire control strategies developed for mountain forests don't have the same results here. So can science help uncover new answers to help Southern California communities manage and live with wildfires? This 11 minute film showcases ongoing USGS research supporting agencies on the
Wildfire Woes for Things That Swim, Hop, Crawl, and Eat a Lot
Biologist Robert Fisher tells a troubling tale of how wildfire in Southern California has disrupted the lives of frogs, shrews, fish, and salamanders (despite the latter's mythical fondness of flame).
USGS and 2007 California Wildfires: Very Endangered Trout
Adam Backlin, USGS Ecologist, talks about the potential dangers to the aquatic life in the streams around the Santa Ana Mountains as a result of the 2007 California wildfires.
USGS and 2007 California Wildfires: The Big Picture
Robert Fisher, USGS Research Biologist talks about the overall impact of fires on the biology of the area.
USGS and 2007 California Wildfires: Post-Fire—Invasive Plants
USGS Biologist, Robert Fisher, talks about the invasive species growing within the areas devastated by the 2007 California wildfires.
USGS Film: Living with Fire
A screenshot from the USGS film "Living with Fire".
"Living with Fire" is a 11-minute USGS production exploring ongoing USGS research on wildfire science in southern California -- where the fire ecology is unlike any other region in the United States.
USGS is investigating ways to balance community fire risk management and native habitat conservation as part
...
Caught on Camera: Sierra Martens and Flying Squirrels Using Wildlife Passage
The adorable Sierra Marten pictured below was caught on wildlife camera in October. The camera was set up to study animal movement under a new road crossing structure known as the “toad road” in Sierra National Forest.
USGS WERC Researcher Wins Award for Reptile and Amphibian Conservation
SAN DIEGO—Dr. Robert Fisher wins Herpetological Conservation Award
Salamander Surveys by WERC Scientists Help Monitor Fungal Threat (US Fish and Wildlife Pacific Southwest Highlights)
SAN DIEGO – WERC scientists find salamanders, test for deadly chytrid disease
Burrowing Owls and Horned Lizards Thrive in Ecological Hot Spot Next to Los Angeles Airport (Los Angeles Times)
LOS ANGELES -- WERC Researchers study lizards and owls at the LAX Dunes preserve
A Unified Research Strategy for Disease Management
As wildlife diseases increase globally, an understanding of host-pathogen relationships can elucidate avenues for management and improve conservation efficacy. Amphibians are among the most threatened groups of wildlife, and disease is a major factor in global amphibian declines.
Large-scale Review of Amphibian Species and Community Response to Climate Change
Amphibian species and community richness has been declining in North America and climate change may play a role in these declines. Global climate change has led to a range shift of many wildlife species and thus understanding how these changes in species distribution can be used to predict amphibian community responses that may improve conservation efforts.
Toad Crossing Ahead: New Study Tests Elevated Roads as Underpasses for Rare Toad
Many amphibians are either too small or too slow to avoid an oncoming car. For some populations of the Federally threatened Yosemite toad (Anaxyrus canorus), this has meant increased mortality from vehicle strikes in addition to other threats from disease, drought, and habitat loss.
New USGS Study Paves a Path Forward for Reptiles, Amphibians, and Roadways
In a new study, U.S. Geological Survey (USGS) scientists ranked more than 160 species and sub-species of reptiles and amphibians in terms of their vulnerability to vehicle strikes and habitat fragmentation from roadways. Their results are published in the journal Landscape Ecology....
Scientists Discover New Species of Fijian Iguana
Researchers from the U.S. Geological Survey, Taronga Conservation Society Australia, The National Trust of Fiji and NatureFiji-MareqetiViti have discovered a new species of banded iguana.
New Research Confirms Continued, Unabated and Large-Scale Amphibian Declines: Local Action Key to Reversing Losses
New U.S. Geological Survey-led research suggests that even though amphibians are severely declining worldwide, there is no smoking gun – and thus no simple solution – to halting or reversing these declines.