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Articles 1 - 9 of 9
Full-Text Articles in Life Sciences
Effects Of Natural Flooding And Manual Trapping On The Facilitation Of Invasive Crayfish-Native Amphibian Coexistence In A Semi-Arid Perennial Stream, Lee Kats, Gary Bucciarelli, Thomas Vandergon, Rodney Honeycutt, Evan Mattiasen, Arthur Sanders, Seth Riley, Jacob Kerby, Robert Fisher
Effects Of Natural Flooding And Manual Trapping On The Facilitation Of Invasive Crayfish-Native Amphibian Coexistence In A Semi-Arid Perennial Stream, Lee Kats, Gary Bucciarelli, Thomas Vandergon, Rodney Honeycutt, Evan Mattiasen, Arthur Sanders, Seth Riley, Jacob Kerby, Robert Fisher
Lee Kats
Aquatic amphibians are known to be vulnerable to a myriad of invasive predators. Invasive crayfish are thought to have eliminated native populations of amphibians in some streams in the semi-arid Santa Monica Mountains of southern California. Despite their toxic skin secretions that defend them from native predators, newts are vulnerable to crayfish attacks, and crayfish have been observed attacking adult newts, and eating newt egg masses and larvae. For 15 years, we have observed invasive crayfish and native California newts coexisting in one stream in the Santa Monica Mountains. During that period, we monitored the densities of both crayfish and …
Species-Level Correlates Of Susceptibility To The Pathogenic Amphibian Fungus Batrachochytrium Dendrobatidis In The United States, Betsy Bancroft, Barbara Han, Catherine Searle, Lindsay Biga, Deanna Olson, Lee Kats, Joshua Lawler, Andrew Blaustein
Species-Level Correlates Of Susceptibility To The Pathogenic Amphibian Fungus Batrachochytrium Dendrobatidis In The United States, Betsy Bancroft, Barbara Han, Catherine Searle, Lindsay Biga, Deanna Olson, Lee Kats, Joshua Lawler, Andrew Blaustein
Lee Kats
Disease is often implicated as a factor in population declines of wildlife and plants. Understanding the characteristics that may predispose a species to infection by a particular pathogen can help direct conservation efforts. Recent declines in amphibian populations world-wide are a major conservation issue and may be caused in part by a fungal pathogen, Batrachochytrium dendrobatidis (Bd). We used Random Forest, a machine learning approach, to identify species-level characteristics that may be related to susceptibility to Bd. Our results suggest that body size at maturity, aspects of egg laying behavior, taxonomic order and family, and reliance on water are good …
The Complexity Of Amphibian Population Declines: Understanding The Role Of Cofactors In Driving Amphibian Losses, Andrew Blaustein, Barbara Han, Rick Relyea, Pieter Johnson, Julia Buck, Stephanie Gervasi, Lee Kats
The Complexity Of Amphibian Population Declines: Understanding The Role Of Cofactors In Driving Amphibian Losses, Andrew Blaustein, Barbara Han, Rick Relyea, Pieter Johnson, Julia Buck, Stephanie Gervasi, Lee Kats
Lee Kats
Population losses and extinctions of species are occurring at unprecedented rates, as exemplified by declines and extinctions of amphibians worldwide. However, studies of amphibian population declines generally do not address the complexity of the phenomenon or its implications for ecological communities, focusing instead on single factors affecting particular amphibian species. We argue that the causes for amphibian population declines are complex; may differ among species, populations, and life stages within a population; and are context dependent with multiple stressors interacting to drive declines. Because amphibians are key components of communities, we emphasize the importance of investigating amphibian declines at the …
Undergraduate Research: Communicating Ecological Field Studies To Local School Children Through Outreach And Curriculum, Lee Kats, Shannon Rollert, Trevor Thurling, Richard Johnson, Daniel Cho, Sean Landis, Randall Van Dragt, Gloria Van Dragt
Undergraduate Research: Communicating Ecological Field Studies To Local School Children Through Outreach And Curriculum, Lee Kats, Shannon Rollert, Trevor Thurling, Richard Johnson, Daniel Cho, Sean Landis, Randall Van Dragt, Gloria Van Dragt
Lee Kats
The writers describe a program to communicate undergraduate research results to local K–12 students in California. They describe the development of a curriculum and an outreach effort to convey findings of ecological field work undertaken by Pepperdine University students. They then describe program implementation and program benefits.
Behavioral Avoidance Of Ultraviolet-B Radiation By Two Species Of Neotropical Poison-Dart Frogs, Barbara Han, Lee Kats, Rachel Pommerening, Ryan Ferrer, Marcia Murry-Ewers, Andrew Blaustein
Behavioral Avoidance Of Ultraviolet-B Radiation By Two Species Of Neotropical Poison-Dart Frogs, Barbara Han, Lee Kats, Rachel Pommerening, Ryan Ferrer, Marcia Murry-Ewers, Andrew Blaustein
Lee Kats
Many animals, plants, and microorganisms are harmed by ultraviolet-B radiation. In particular, several members of class amphibia are negatively affected by exposure to ultraviolet-B radiation. Exposure to ultraviolet-B radiation can cause death or various types of sublethal damage in amphibians. One mechanism to lessen the effect of harmful ultraviolet-B radiation is to limit exposure to sunlight behaviorally. Few studies have examined the behavioral sensitivity of adult amphibians to ultraviolet-B radiation. Using both field experiments and field observations, we found that two species of diurnal poison-dart frogs in Costa Rica (Dendrobates pumilio, D. auratus) consistently preferred areas in the field and …
The Scent Of Danger: Tetrodotoxin (Ttx) As An Olfactory Cue Of Predation Risk, Richard Zimmer, Daniel Schar, Ryan Ferrer, Patrick Krug, Lee Kats, William Michel
The Scent Of Danger: Tetrodotoxin (Ttx) As An Olfactory Cue Of Predation Risk, Richard Zimmer, Daniel Schar, Ryan Ferrer, Patrick Krug, Lee Kats, William Michel
Lee Kats
Larvae of the California newt (Taricha torosa) exhibit striking predator- avoidance behavior, escaping to refuges in response to a chemical cue from cannibalistic adults. In laboratory flow-tank experiments, stream water collected near free-ranging adults induced hiding responses in 100% of the larvae tested. Solutions prepared by bathing adults (in field and laboratory) also evoked strong hiding behaviors. Insensitive to adult feeding status (fed or starved), and clearly not an excretory product, the chemical cue was released from adult skin (i.e., in swabs of adult backs, sides, and bellies). Tetrodotoxin (TTX) was found in skin swabs of adults and in bathwater …
Longevity And Breeding Pool Fidelity In The California Newt (Taricha Torosa): A Long-Term Study Using Pit Tagging, T. Watters, Lee Kats
Longevity And Breeding Pool Fidelity In The California Newt (Taricha Torosa): A Long-Term Study Using Pit Tagging, T. Watters, Lee Kats
Lee Kats
No abstract provided.
Barriers And Flow As Limiting Factors In The Spread Of An Invasive Crayfish (Procambarus Clarkii) In Southern California Streams, Jacob Kerby, Seth Riley, Lee Kats, Paul Wilson
Barriers And Flow As Limiting Factors In The Spread Of An Invasive Crayfish (Procambarus Clarkii) In Southern California Streams, Jacob Kerby, Seth Riley, Lee Kats, Paul Wilson
Lee Kats
Invasive crayfish are a major threat to stream ecosystems, yet research has seldom identified successful ways of preventing their spread. Thirty-two stream sections were surveyed during 2000 and 2001 in the Santa Monica Mountains of southern California to determine the distribution of the invasive crayfish Procambarus clarkii. Streams with large barriers (waterfalls, culverts) often did not have crayfish present upstream of barriers. A mark-recapture study indicated that P. clarkii moved both up and downstream between pools, but that barriers significantly reduced movement between pools. Seasonal high flow velocities likely increase passive movement downstream and reduce movement upstream. Results indicate that …
Effects Of Urbanization On The Distribution And Abundance Of Amphibians And Invasive Species In Southern California Streams, Seth Riley, Gary Busteed, Lee Kats, Thomas Vandergon, Lena Lee, Rosi Dagit, Jacob Kerby, Robert Fisher, Raymond Sauvajot
Effects Of Urbanization On The Distribution And Abundance Of Amphibians And Invasive Species In Southern California Streams, Seth Riley, Gary Busteed, Lee Kats, Thomas Vandergon, Lena Lee, Rosi Dagit, Jacob Kerby, Robert Fisher, Raymond Sauvajot
Lee Kats
Urbanization negatively affects natural ecosystems in many ways, and aquatic systems in particular. Urbanization is also cited as one of the potential contributors to recent dramatic declines in amphibian populations. From 2000 to 2002 we determined the distribution and abundance of native amphibians and ex- otic predators and characterized stream habitat and invertebrate communities in 35 streams in an urbanized landscape north of Los Angeles (U.S.A.). We measured watershed development as the percentage of area within each watershed occupied by urban land uses. Streams in more developed watersheds often had exotic crayfish ( Procambarus clarkii) and fish, and had fewer …