CDFW Conservation Lecture Series Archive

Biologist, Jeff Alvarez, has been working with sympatric populations of California tiger salamanders and California red-legged frogs for nearly 20 years. These apparently disparate species have many similarities and differences, yet aquatic and upland management techniques that support one species appear to support the other. Since the range of red-legged frogs and tiger salamanders overlap over a large area in California, species' management can impact or benefit both species. Jeff will present a lecture that includes discussion about the benefits of grazing, silt and vegetation removal, ground squirrel management, as well as habitat associations, rate of sympatry, inter-annual variability in observed breeding, and more, time permitting. Video: California Red-Legged Frog - by Jeff Alvarez 

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Carson Jeffres, field and laboratory director for the UC Davis Center for Watershed Science, will discuss recent research on use of harvested rice fields as potential salmon nurseries. Frequently inundated large floodplains are functionally extinct in the Central Valley; many of the ecological benefits have been lost to riverine species. Since 2012 Jeffres has been studying whether flooded post-harvest rice fields can act as a surrogate for this lost habitat. Jeffres found that juvenile Chinook salmon on flooded rice fields grow at some of the fastest freshwater growth rates (.95mm/day) of juvenile salmon ever found in California. This talk will focus on what makes this surrogate floodplain productive and how inter-annual variation in weather dictates when and where conditions are suitable for the rearing juvenile Chinook salmon. 

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In 2001, white abalone became the first marine invertebrate to be federally listed as endangered, after intense over fishing in the 1970s severely depleted their population. Enhancement of the wild population through captive propagation was identified as the primary avenue for reversing the population's current trajectory toward extinction. In 2012, the Bodega Marine Laboratory celebrated the first instance of captive white abalone reproduction in nearly a decade, and small successes in captive reproduction have continued. Dr. Aquilino will discuss overcoming challenges in broodstock reproductive conditioning and increasing the survival of newly settled animals, which will help accelerate captive propagation and the recovery of wild white abalone populations. Video: White Abalone. Photo by Sammy Tillery 

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The Amargosa vole is an endangered species with the possibility of extinction without immediate and on-going recovery actions. The presenters discuss population dynamics, habitat selection, occupancy patterns, and relationship of water to the distribution of the vole's habitat. Video: Amargosa Vole. Photo by Dr. Janet Foley, UC Davis 

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The Amargosa vole is an endangered species with the possibility of extinction without immediate and on-going recovery actions. The presenters discuss population dynamics, habitat selection, occupancy patterns, and relationship of water to the distribution of the vole's habitat. Video: Amargosa Vole. Photo by Dr. Janet Foley, UC Davis 

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Dr. Ellis has been studying the ecology of aquatic species in northeastern California since 1990. She wrote the Shasta crayfish draft recovery plan for CDFW and assisted USFWS in the preparation of the final recovery plan for the Shasta crayfish. Dr. Ellis helped to develop a Safe Harbor Agreement for Shasta Crayfish. In her presentation, Dr. Ellis discusses the ecology of the species, threats, and management activities that encourage recovery of the species and restoration of its habitat. Video: Shasta Crayfish Lecture 

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Dr. Searcy presents an overview of the natural history of this species. Dr. Searcy addresses seasonal activity and responses to weather patterns as well as migration distances and density distribution throughout the habitat. Dr. Searcy describes his most recent study results on hybridization with the invasive barred tiger salamander. Video: California tiger salamander. Photo by Margaret Mantor, CDFW 

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Karen Swaim presents current scientific information on Alameda striped racer. Her lecture focuses on the life history of the species, including biology, habitat use, and behavior. Karen addresses conservation and management issues. 

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The coastal cactus wren has declined precipitously in southern California over the last twenty years as a result of habitat loss and fragmentation due to urbanization and catastrophic wildfires. Dr. Preston discusses results of a regional collaborative partnership that has worked to address key questions critical to developing effective management actions to halt the wren’s decline. Video: Cactus wren. Photo by Steve Brad, USGS 

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Dr. Sacks discusses research on Sierra Nevada red fox and the Sacramento Valley red fox. Historically, Sierra Nevada red fox were present throughout the subalpine zone of the Sierra Nevada range in California but over the last century, their abundance and distribution have declined dramatically. The Sacramento Valley red fox was recently shown to be a second native subspecies confined to the northern Central Valley. Dr. Sacks presents findings on biogeography, ecology, and conservation issues in the context of previous and ongoing research. Video: Sierra Nevada and Sacramento Valley red fox. Photo by Dr. Ben Sacks 

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