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Articles 1 - 13 of 13
Full-Text Articles in Life Sciences
Interactions Between Chytrids Cause Variable Infection Strategies On Harmful Algal Bloom Forming Species, Katelyn M. Mckindles, R. Michael L. Mckay, George S. Bullerjahn, Thijs Frenken
Interactions Between Chytrids Cause Variable Infection Strategies On Harmful Algal Bloom Forming Species, Katelyn M. Mckindles, R. Michael L. Mckay, George S. Bullerjahn, Thijs Frenken
Great Lakes Institute for Environmental Research Publications
Cyanobacteria have a great diversity of natural enemies, such as herbivores and pathogens, including fungal pathogens within the Chytridiomycota (chytrids). While these pathogens have been previously described on a select number of cyanobacterial hosts and are suspected to play a significant ecological role, little is understood about species interactions and how competition between parasites can affect epidemic development and bloom formation. Here, three Planktothrix agardhii isolates from Sandusky Bay, Lake Erie (OH, USA) were challenged in monoculture and polyculture against infection by three isolates (C1, C2, C10) of their obligate chytrid fungal pathogen, Rhizophydiales sp. The chytrid isolates were inoculated …
Prevalence Of Batrachochytrium And Ranavirus In Southern Torrent Salamanders (Rhyacotriton Variegatus) In Northern California, Marilyn Violeta Sandoval
Prevalence Of Batrachochytrium And Ranavirus In Southern Torrent Salamanders (Rhyacotriton Variegatus) In Northern California, Marilyn Violeta Sandoval
Cal Poly Humboldt theses and projects
Amphibian population declines around the world have been attributed in part to the emergence of deadly pathogens. However, the severity of the effects of pathogens on amphibian communities can vary by species and location. This study focuses on assessing the prevalence of Batrachochytrium dendrobatidis (Bd), Batrachochytrium salamandrivorans (Bsal), and ranaviruses in populations of southern torrent salamanders (Rhyacotriton variegatus). I also tested for association between environmental factors and the prevalence and viral load of the three pathogens in Northern California. A total of 309 skin swab samples were collected from salamanders in nine sites in …
Environmental Factors Affecting Chytrid (Chytridiomycota) Infection Rates On Planktothrix Agardhii, Katelyn M. Mckindles, Makayla A. Manes, R. Michael Mckay, Timothy W. Davis, George S. Bullerjahn
Environmental Factors Affecting Chytrid (Chytridiomycota) Infection Rates On Planktothrix Agardhii, Katelyn M. Mckindles, Makayla A. Manes, R. Michael Mckay, Timothy W. Davis, George S. Bullerjahn
Great Lakes Institute for Environmental Research Publications
Planktothrix agardhii dominates the cyanobacterial harmful algal bloom biomass in Sandusky Bay, Lake Erie (USA) from May until September. This filamentous cyanobacterium known parasites including the chytrid fungal species Rhizophydium sp. C02, which was previously isolated from this region. The purpose of our work has been to establish how parasitic interactions affect Planktothrix population dynamics during a bloom event. Samples analyzed from the 2015 to 2019 bloom seasons using quantitative PCR investigate the spatial and temporal prevalence of chytrid infections. Abiotic factors examined in lab include manipulating temperature (17-31°C), conductivity (0.226-1.225 mS/cm) and turbulence. Planktothrix-specific chytrids are present throughout the …
Isolation And Characterization Of Rhizophydiales (Chytridiomycota), Obligate Parasites Of Planktothrix Agardhii In A Laurentian Great Lakes Embayment, Katelyn M. Mckindles, Alejandro N. Jorge, R. Michael Mckay, Timothy W. Davis, George S. Bullerjahna
Isolation And Characterization Of Rhizophydiales (Chytridiomycota), Obligate Parasites Of Planktothrix Agardhii In A Laurentian Great Lakes Embayment, Katelyn M. Mckindles, Alejandro N. Jorge, R. Michael Mckay, Timothy W. Davis, George S. Bullerjahna
Great Lakes Institute for Environmental Research Publications
Planktothrix agardhii dominates the cyanobacterial harmful algal bloom community in Sandusky Bay, Lake Erie (USA), from May through September. This filamentous cyanobacterium is host to a known obligate parasite, the chytrid Rhizophydium sp. During the 2018 bloom season, by utilizing dilution and single-filament isolation techniques, 7 chytrid and 12 P. agardhii strains were isolated from Sandusky Bay. These 7 chytrids and a selection of P. agardhii hosts were then characterized with respect to infection rates. Infections by the isolated chytrids were specific to Planktothrix planktonic species and were not found on other filamentous cyanobacterial taxa present in the bay (Aphanizomenon …
Back From The Brink?: Rebounding And Remnant Amphibian Populations In A Pathogen Enzootic Environment, Alexander D. Shepack
Back From The Brink?: Rebounding And Remnant Amphibian Populations In A Pathogen Enzootic Environment, Alexander D. Shepack
FIU Electronic Theses and Dissertations
The Anthropocene epoch has been marred by a global biodiversity crisis and the advent of Earth’s sixth mass extinction. Amphibians, the most threatened vertebrate taxa, have become the poster children for this sixth mass extinction. The pathogenic fungus Batrachochytrium dendrobatidis has been blamed for many of declines and extinctions seen in amphibians. The now panglobal Bd causes the disease chytridiomycosis in a large number of amphibian species and has been linked to population crashes in Central and South America, Australia, Europe, and the United States. Now enzootic around the world, amphibian populations continue to confront Bd in a long-term battle …
Evaluation Of Severity And Factors Contributing To Foot Lesions In Endangered Ozark Hellbenders, Cryptobranchus Alleganiensis Bishopi, Rebecca H. Hardman, Kelly J. Irwin, William B. Sutton, Debra L. Miller
Evaluation Of Severity And Factors Contributing To Foot Lesions In Endangered Ozark Hellbenders, Cryptobranchus Alleganiensis Bishopi, Rebecca H. Hardman, Kelly J. Irwin, William B. Sutton, Debra L. Miller
Agricultural and Environmental Sciences Faculty Research
Arkansas populations of Ozark Hellbenders, Cryptobranchus alleganiensis bishopi have declined precipitously over the past few decades and are now limited to a single river. Biologists have also observed an increase of distal limb lesions with unidentified etiology and unknown role in morbidity and mortality of the species in this location. We documented lesions and collected associated individual size class data and pathogen samples in Ozark Hellbenders of Arkansas (n = 73) from 2011 to 2014 with the following two objectives: (1) document spatiotemporal patterns and severity of lesions present in this last remaining Arkansas Ozark Hellbender population, and (2) determine …
Release Of Captive-Raised Eastern Hellbenders (Cryptobranchus Alleganiensis) To Test The Success Of A Chytrid Vaccine And New Cage Design, Megan C. Kocher
Release Of Captive-Raised Eastern Hellbenders (Cryptobranchus Alleganiensis) To Test The Success Of A Chytrid Vaccine And New Cage Design, Megan C. Kocher
Biology Theses
Researchers and managers commonly apply captive-raising and reintroductions of animals to offset losses due to worldwide amphibian declines. Recent declines in the Eastern hellbender (Cryptobranchus alleganiensis alleganiensis) have resulted in several reintroductions that have had little success. There is evidence that chytridiomycosis (chytrid), a disease caused by the fungus Batrachochytrium dendrobatidis (Bd), may negatively affect hellbenders post-release. Further, excessive post-release movement may result in movement away from suitable habitat and increased risk of predation which can have negative effects on the survival of released hellbenders. Caging captive-raised animals can be effective for limiting excessive post-release movement. …
Conservation Risk Of Batrachochytrium Salamandrivorans To Endemic Lungless Salamanders, Edward Davis Carter, Debra L. Miller, Anna C. Peterson, William B. Sutton, Joseph Patrick W. Cusaac, Jennifer A. Spatz, Louise Rollins-Smith, Laura Reinert, Markese Bohanon, Lori A. Williams, Andrea Upchurch, Matthew J. Gray
Conservation Risk Of Batrachochytrium Salamandrivorans To Endemic Lungless Salamanders, Edward Davis Carter, Debra L. Miller, Anna C. Peterson, William B. Sutton, Joseph Patrick W. Cusaac, Jennifer A. Spatz, Louise Rollins-Smith, Laura Reinert, Markese Bohanon, Lori A. Williams, Andrea Upchurch, Matthew J. Gray
Agricultural and Environmental Sciences Faculty Research
The emerging fungal pathogen, Batrachochytrium salamandrivorans (Bsal), is a significant conservation threat to salamander biodiversity in Europe, although its potential to affect North American species is poorly understood. We tested the susceptibility of two genera (Eurycea and Pseudotriton) and three populations of lungless salamanders (Plethodontidae) to Bsal. All species became infected with Bsal and two (Pseudotriton ruber and Eurycea wilderae) developed chytridiomycosis. We also documented that susceptibility of E. wilderae differed among populations. Regardless of susceptibility, all species reduced feeding when exposed to Bsal at the highest zoospore dose, and P. ruber and one population of E. wilderae used cover …
Natural History And Conservation Of Bolitoglossine Salamanders In Central Panama, Leslie Caren Brinkman
Natural History And Conservation Of Bolitoglossine Salamanders In Central Panama, Leslie Caren Brinkman
MSU Graduate Theses
I conducted a mark-recapture study to assess the natural history of a Neotropical salamander community in three discrete 4–6 week sampling periods at Chorro Las Yayas, a protected natural area of about 8000 m2 in central Panama, during an extended drought. I captured 87 Bolitoglossa biseriata, 17 Oedipina complex, and 15 O. parvipes. Bolitoglossa biseriata, had a mean mass of 0.8 ± 0.4 g with a mean snout-vent length (SVL) of 31.45 ± 5.30 mm. Bolitoglossa biseriata was active throughout the night, and its detection rate varied with season, air temperature, and amount of precipitation in the previous 24 h. …
An Overview Of Batrachochytrium Dendrobatidis In Utah, With A Focus On Boreal Toads And Their Changing Conservation Status, Samantha A. Beirne
An Overview Of Batrachochytrium Dendrobatidis In Utah, With A Focus On Boreal Toads And Their Changing Conservation Status, Samantha A. Beirne
Undergraduate Honors Capstone Projects
The Boreal Toad (Anaxyrus boreas) has disappeared from a large portion of its range in southern Utah and it has been questioned whether Batrachochytrium dendrobatidis (Bd, also known as chytrid) has played a role in its disappearance. The role of chytrid in range contraction of Boreal Toads and other amphibians in Utah is unknown. The primary objective of this project is to determine if any historic Boreal Toad specimens have chytrid to determine its arrival in Utah. If any old specimens test positive, the secondary goal of this study is to determine if there is a relationship between …
Chytrid Loads, Pathogen Prevalence, And Contemporary Host Source-Sink Dynamics In Dry Vs. Wet Forests; Evaluating Refugia From Disease In Australian Torrent Frogs., Barbara Rizzo
Dissertations and Theses
No abstract provided.
Long-Term Data For Endemic Frog Genera Reveal Potential Conservation Crisis In The Bale Mountains, Ethiopia, David J. Gower, Roman K. Aberra, Silvia Schwaller, Malcolm J. Largen, Ben Collen, Stephen Spawls, Michele Menegon, Breda M. Zimkus, Rafael O. De Sá, Et Al.
Long-Term Data For Endemic Frog Genera Reveal Potential Conservation Crisis In The Bale Mountains, Ethiopia, David J. Gower, Roman K. Aberra, Silvia Schwaller, Malcolm J. Largen, Ben Collen, Stephen Spawls, Michele Menegon, Breda M. Zimkus, Rafael O. De Sá, Et Al.
Biology Faculty Publications
Populations of many frogs have declined alarmingly in recent years, placing nearly one third of the > 6,000 species under threat of extinction. Declines have been attributed largely to habitat loss, environmental degradation and/or infectious diseases such as chytridiomycosis. Many frogs undergo dramatic natural population fluctuations such that long-term data are required to determine population trends without undue influence of stochastic factors. We present long-term quantitative data (individuals encountered per person hour of searching) for four monotypic frog genera endemic to an Afromontane region of exceptional importance but growing conservation concern: one endemic to the Ethiopian highlands (Spinophrynoides osgoodi) and three …
Impact Of A Chytrid-Related Mortality Event On A Population Of The Green And Golden Bell Frog Litoria Aurea, Trent D. Penman, G Muir, E Magarey, E Burns
Impact Of A Chytrid-Related Mortality Event On A Population Of The Green And Golden Bell Frog Litoria Aurea, Trent D. Penman, G Muir, E Magarey, E Burns
Faculty of Science - Papers (Archive)
Chytridiomycosis is considered a key threatening process under Commonwealth legislation. Little is known of the impact of this pathogen within wild populations. The Green and Golden Bell Frog Litoria aurea is a threatened species that is thought to be affected by this disease. Here we present an example of a chytrid related mortality event within an apparently healthy population of this species. The individuals were found to be carrying chytrid and we suggest that this was the proximal cause of mortality. Monitoring was conducted across Sydney Olympic Park between 1998 and 2005. In a small group of ponds in 1999, …