Jacob L Kerby

Jacob L Kerby
University of South Dakota | USD · Department of Biology

Ph.D., Ecology. UC Davis

About

106
Publications
16,630
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2,697
Citations
Additional affiliations
January 2011 - December 2012
The University of Memphis
January 2009 - December 2011
University of South Dakota
January 2009 - present
University of Illinois at Chicago

Publications

Publications (106)
Article
Amphibians are globally threatened by emerging infectious diseases, and ranaviruses are among the most concerning pathogens to threaten species in the wild. We sampled for ranaviruses in wild amphibians at 8 sites in Costa Rica, spanning broad climatic zones and taxonomic associations. Seven of these sites are inhabited by highly threatened amphibi...
Article
Full-text available
Amphibians have declined around the world in recent years, in parallel with the emergence of an epidermal disease called chytridiomycosis, caused by the chytrid fungus Batrachochytrium dendrobatidis ( Bd ). This disease has been associated with mass mortality in amphibians worldwide, including in Costa Rica, and Bd is considered an important contri...
Article
Full-text available
Amphibians are globally threatened by emerging infectious diseases, and ranaviruses are among the most concerning pathogens to threaten species in the wild. We sampled for ranaviruses in wild amphibians at 8 sites in Costa Rica, spanning broad climatic zones and taxonomic associations. Seven of these sites are inhabited by highly threatened amphibi...
Chapter
Full-text available
Animals with complex life histories such as aquatic insects and amphibians link freshwater and terrestrial ecosystems when they transition from water to land during development. This transition requires metamorphosis from juvenile to adult life stages. Metamorphosis is a stressful and ecologically sensitive life history event. Exposure to contamina...
Article
Declines in amphibians are a global problem, influenced by complex local factors. While many factors contribute to these declines, much attention has been focused on the roles of contaminants and pathogens. Throughout eastern South Dakota, row-crop farming has contributed to habitat degradation for many amphibians, often through increases in enviro...
Article
Ongoing investigations into the interactions between microbial communities and their associated hosts are changing how emerging diseases are perceived and ameliorated. Of the numerous host-microbiome-disease systems of study, the emergence of chytridiomycosis (caused by Batrachochytrium dendrobatidis, hereafter Bd) has been implicated in ongoing de...
Article
Full-text available
Several infectious diseases are threatening amphibian species worldwide and have resulted in mass-mortality events across the globe. An emerging group of viral pathogens (ranaviruses) are documented to cause die-offs in amphibian populations worldwide, including in several regions of the U.S. Unfortunately, large gaps remain in our understanding of...
Article
Full-text available
The Prairie Pothole Region (PPR) of the United States and Canada is a vast network of wetlands that provide rich habitat for waterfowl and aquatic organisms. Much of the landscape surrounding these wetlands is dominated by agriculture, allowing for contaminants such as neonicotinoid insecticides and selenium to enter these water bodies following pr...
Article
Full-text available
Chytridiomycosis, an infectious disease caused by the fungus Batrachochytrium dendrobatidis (chytrid or Bd), has not been well studied in Oklahoma. This is of particular concern regarding the connection between seasonality and chytrid infection. To further investigate this connection, chytrid prevalence and infection load were quantified within amp...
Article
Full-text available
Animal-associated microbiomes are integral to host health, yet key biotic and abiotic factors that shape host-associated microbial communities at the global scale remain poorly understood. We investigated global patterns in amphibian skin bacterial communities, incorporating samples from 2,349 individuals representing 205 amphibian species across a...
Article
Full-text available
Understanding how environmental factors influence various aspects of freshwater turtle health remains an important yet understudied topic within the context of individual-environment interactions. This is particularly true of host-associated bacterial microbiota, which are being increasingly recognized as a significant and understudied topic in the...
Article
Full-text available
Amphibian skin is a suitable environment for rich communities of microorganisms, both beneficial and detrimental to the host. The amphibian cutaneous microbiota has been hypothesized to play an important role as symbionts, protecting their hosts against disease. Costa Rica has one of the most diverse assemblages of amphibians in the world and we kn...
Article
Full-text available
Amphibian populations worldwide are facing numerous threats, including the emergence and spread of infectious diseases. In the past 2 decades, Batrachochytrium dendrobatidis (Bd), a parasitic fungus, and a group of viruses comprising the genus Ranavirus have become widespread and resulted in mass mortality events and extirpations worldwide. In 2013...
Article
Full-text available
Accurate pathogen detection is essential for developing management strategies to address emerging infectious diseases, an increasingly prominent threat to wildlife. Sampling for free-living pathogens outside of their hosts has benefits for inference and study efficiency, but is still uncommon. We used a laboratory experiment to evaluate the influen...
Article
The chytrid fungus Batrachochytrium dendrobatidis (Bd), the causal agent of the amphibian disease chytridiomycosis, has spread at an alarming rate since its discovery. Bd was initially thought to only infect keratinizing epithelial cells in amphibians, a core component of amphibian skin. However, recent studies have detected Bd on the integument of...
Article
Full-text available
Global amphibian biodiversity has declined dramatically in the past 4 decades, and many amphibian species have declined to near extinction as a result of emergence of the amphibian chytrid fungus, Batrachochytrium dendrobatidis (Bd). However, persistent or recovering populations of several amphibian species have recently been rediscovered, and such...
Article
Full-text available
Global amphibian declines and extinction events are occurring at an unprecedented rate. While several factors are responsible for declines and extinction, the fungal pathogen Batrachochytrium dendrobatidis (Bd) has been cited as a major constituent in these events. While the effects of this chytrid fungus have been shown to cause broad scale popula...
Article
Full-text available
The fields of behavioral ecology, conservation science, and environmental toxicology individually aim to protect and manage the conservation of wildlife in response to anthropogenic stressors, including widespread anthropogenic pollution. Although great emphasis in the field of toxicology has been placed on understanding how single pollutants affec...
Article
Full-text available
The fungal pathogen Batrachochytrium dendrobatidis (Bd) has caused the greatest known wildlife pandemic, infecting over 500 amphibian species. It remains unclear why some host species decline from disease-related mortality whereas others persist. We introduce a conceptual model that predicts that infection risk in ectotherms will decrease as the di...
Article
Tadpoles of many anuran species live in bodies of water that contain a variety of environmental substrates to which food can be a fixed. Especially for benthic and planktonic feeders, acquiring food from various surfaces may differentially wear tadpole mouthparts and cause alterations in foraging efficiencies and subsequent growth. We conducted an...
Article
The amphibian disease chytridiomycosis, caused by the pathogenic fungus Batrachochytrium dendrobatidis (Bd), has been linked to significant amphibian declines over the past three decades. The most severe effects of the pathogen have been primarily observed in relatively pristine areas that are not affected by many anthropogenic factors. One hypothe...
Article
Full-text available
Wildlife epidemiological outcomes can depend strongly on the composition of an ecological community, particularly when multiple host species are affected by the same pathogen. However, the relationship between host species richness and disease risk can vary with community context and with the degree of spillover transmission that occurs among co-oc...
Data
Table S2. The number of missing tadpoles for each of three host species Anaxyrus boreas (A), Pseudacris regilla (P), and Rana cascadae (R) across 7 species combinations and two pathogen treatments (Bd).
Data
Table S3. Generalized linear models for mean growth in mass (mg) and length (mm) in tadpoles of two amphibian host species among four species combinations (Combo) and two pathogen treatments (Bd). Models include a two-way interaction term (Bd*combo) and Day as a covariate.
Data
Figure S1. The mean proportion of tadpoles of Anaxyrus boreas (A), Pseudacris regilla (B), and Rana cascadae (C) that died in each of four species combinations and two Bd pathogen treatments.
Data
Table S1. Generalized linear models of Batrachochytrium infection severity for each of three host species: Anaxyrus boreas (Anaxyrus), Pseudacris regilla (Pseudacris), and Rana cascadae (Rana). Factors for each model include species combinations (Combinations, 4 levels), and day of death (Day).
Article
Amphibian species worldwide are being confronted with novel anthropogenic stressors such as contaminants and invasive species. While much work has been done to examine these factors individually, less is known about how these stressors might interact. No studies to this point have examined the potentially synergistic impacts between these two stres...
Article
The authors' reply: Ghose et al. [1] reported an array of acute toxicity tests using aquatic amphibian larvae of a single species, combined with meta-analysis techniques, to illustrate that pesticides commonly used in Costa Rica are understudied relative to pesticides commonly used in the United States. In a response to our paper, Weltje and Wheele...
Article
Amphibian populations are declining worldwide, particularly in tropical regions where amphibian diversity is highest. Pollutants, including agricultural pesticides, have been identified as one potential contributor to declines, yet toxicological studies of tropical amphibians are very rare. This study assesses toxic effects on amphibians of ten com...
Conference Paper
Background/Question/Methods Chytridiomycosis, an emerging infectious amphibian disease caused by the pathogenic fungus Batrachochytrium dendrobatidis (Bd), has played a major roll in amphibian declines. Studies have also shown that widespread pesticide use contributes to declines in amphibian health. These causes are not mutually exclusive; thus,...
Conference Paper
Background/Question/Methods Under the Toxic Substances Control Act, the Environmental Protection Agency (EPA) has the power to require testing of chemical substances in order to regulate exposure to chemicals and set acceptable environmental concentrations. Acute toxicity tests (LC50) are highly criticized for being unable to capture the complexi...
Article
Full-text available
American Bullfrogs (Lithobates catesbeianus) have been widely introduced beyond their native range in North America and can negatively affect organisms in wetland environments via a suite of mechanisms including interspecific interactions and disease transmission. Bullfrogs were introduced to the Valentine National Wildlife Refuge in the Sandhill R...
Article
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 crayfis...
Article
Two factors influencing amphibian population declines are infectious diseases and exposure to anthropogenic contaminants. We examined an emerging fungal pathogen, Batrachochytrium dendrobatidis (Bd), and its interaction with an emerging contaminant, the antimicrobial triclosan. We first conducted, a two x two x four factorial study to examine the i...
Article
Full-text available
Amphibian populations are globally threatened by emerging infectious diseases, and 2 pathogens in particular are recognized as major threats: the amphibian chytrid fungus Batrachochytrium dendrobatidis (Bd) and ranaviruses. Here, we evaluated the prevalence of infection by Bd and ranavirus in an assemblage of frogs from a lowland wet forest in Cost...