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Full-Text Articles in Physical Sciences and Mathematics
Climate Matching As A Tool For Predicting Potential North American Spread Of Brown Treesnakes, Gordon H. Rodda, Robert N. Reed, Catherine S. Jarnevich
Climate Matching As A Tool For Predicting Potential North American Spread Of Brown Treesnakes, Gordon H. Rodda, Robert N. Reed, Catherine S. Jarnevich
Managing Vertebrate Invasive Species
Climate matching identifies extralimital destinations that could be colonized by a potential invasive species on the basis of similarity to climates found in the species’ native range. Climate is a proxy for the factors that determine whether a population will reproduce enough to offset mortality. Previous climate matching models (e.g., Genetic Algorithm for Rule-set Prediction [GARP]) for brown treesnakes (Boiga irregularis) were unsatisfactory, perhaps because the models failed to allow different combinations of climate attributes to influence a species’ range limits in different parts of the range. Therefore, we explored the climate space described by bivariate parameters of …
Can Temperature Be Used As A Tool For Limiting Brown Treesnake Invasion Via Transportation Pathways?, Michelle T. Christy, Julie A. Savidge, Richard Bischof, Gordon H. Rodda
Can Temperature Be Used As A Tool For Limiting Brown Treesnake Invasion Via Transportation Pathways?, Michelle T. Christy, Julie A. Savidge, Richard Bischof, Gordon H. Rodda
Managing Vertebrate Invasive Species
The use of extreme temperatures is one of the few chemical residue-free techniques available for control of pest species and has proven fast and effective in a variety of applications. We determined the upper and lower lethal temperatures for the brown treesnake. We also investigated whether gender, size, body condition and exposure time influenced survival at temperature extremes. Elevating snake core temperatures to 40°C and 41°C for one hour resulted in 99% mortality within seven days (40°C) and 100% mortality within one hour of exposure (41°C). Mortality decreased sharply to 51% for a one hour exposure to 39°C. Shorter, heavier …
Spotting Cryptic Animals In The Dark: What Light Properties Should A Good Headlamp Have?, Bjorn Lardner, Julie A. Savidge, Gordon H. Rodda
Spotting Cryptic Animals In The Dark: What Light Properties Should A Good Headlamp Have?, Bjorn Lardner, Julie A. Savidge, Gordon H. Rodda
Managing Vertebrate Invasive Species
Relying on headlamp illumination for visual detection of cryptic nocturnal animals may present a challenge. To test how search light properties affect brown treesnake (Boiga irregularis) detection rate, we assigned eight biologists to search for dead snakes placed in roadside vegetation. Each person conducted 4 searches using lamps with varying properties: weak versus strong light, crossed by narrow versus wide beam. On each occasion, 100 snakes were placed randomly along the roadside transect. The mean number spotted per transect search was 13.5. Using an information theoretic approach, sequential order of transect runs was the only confounding variable included …