Stressors

Declines in amphibian populations have occurred not only on areas clearly impacted by human activities such as urbanization, but also on protected lands intended to buffer amphibians and other wildlife from anthropogenic disturbances. Some stressors are not stopped by preserve boundaries and can affect wildlife populations 10's or 100's of kilometers from their source or point of use. For example, pesticides, fertilizers, or supplements given to livestock can be transported from the terrestrial setting where they are applied, to aquatic environments via precipitation, run-off, erosion, wind, and misuse. Conversely, some contaminants such as mercury or selenium occur naturally, but can be concentrated, or disturbed and released into the environment by human activities. Amphibian populations can be exposed to multiple stressors simultaneously, producing novel conditions with unknown outcomes.

ARMI scientists conduct research to identify stressors and evaluate their impacts on amphibian individuals and populations.

Gary Fellers, air quality
ARMI biologist Gary Fellers changing a filter in an air sampler that is used to measure agricultural chemicals that drift into Yosemite NP, California. Photo by: J. Fellers.

Stressors - ARMI Papers & Reports

Trend Data Big Thicket National Preserve Occupancy Monitoring VES/VOC: Acris blanchardi, Eleutherodactylus cystignathoides, Gastrophryne carolinensis, Hyla chrysoscelis, Hyla cinerea, Incilius nebulifer, Lithobates catesbeianus, Lithobates clamitans, Lithobates grylio, Lithobates sphenocephalus, Pseudacris crucifer, Pseudacris fouquettei ( American Bullfrog, Blanchard's Cricket Frog, Cope's Gray Treefrog, Eastern Narrow-mouthed Toad, Green Frog, Green Tree Frog, Pig Frog, Rio Grande Chirping Frog, Southern Leopard Frog, Spring Peeper)
Location: Below Saltwater Barrier ; Below Saltwater Barrier
The goal of this study is to monitor anuran occupancy using standard protocols while also recording salinities, as this area is below a saltwater barrier on the Neches River and is susceptible to saltwater encroachment during tropical storm surges or periods of drought, which may impact anuran occupancy. We also added 20 sites north of the saltwater barrier as reference sites in 2012.
Trend Data Non-federal lands in Iowa, Illinois, Wisconsin, and Minnesota: Acris blanchardi ( Blanchard's Cricket Frog)
Location: Varied with the survey type. For the 2006 nighttime call surveys of Acris crepitans (and subseque... ; Non-federal lands in Iowa, Illinois, Wisconsin, and Minnesota
Describe baseline amphibian diversity, gross external deformities, and the presence of pathogens relative to environmental conditions. Estimate baseline occupancy and detection probabilities when possible.
Trend Data Big Thicket National Preserve Occupancy Monitoring VES/VOC: Acris blanchardi, Eleutherodactylus cystignathoides, Gastrophryne carolinensis, Hyla chrysoscelis, Hyla cinerea, Incilius nebulifer, Lithobates catesbeianus, Lithobates clamitans, Lithobates grylio, Lithobates sphenocephalus, Pseudacris crucifer, Pseudacris fouquettei ( American Bullfrog, Blanchard's Cricket Frog, Cope's Gray Treefrog, Eastern Narrow-mouthed Toad, Green Frog, Green Tree Frog, Pig Frog, Rio Grande Chirping Frog, Southern Leopard Frog, Spring Peeper)
Location: The area of inference is a bottomland swamp north of I10 extending about 7 km, east of Beaumont, ... ; Above Saltwater Barrier
The goal of this study is to monitor anuran occupancy using standard protocols while also recording salinities, as this area is below a saltwater barrier on the Neches River and is susceptible to saltwater encroachment during tropical storm surges or periods of drought, which may impact anuran occupancy. We also added 20 sites north of the saltwater barrier as reference sites in 2012.
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