![]() ![]() ![]() “You are going to write about snakes?” Vicki said when I mentioned this review. It is all these things that have made them what they are, and these are the things that you can’t come to know by hearsay, you can only know them if you have lived them. Geological Survey Open-File Report 2009–1202, 302 p.Ĭhapter One–Introduction and Synopsis of ConclusionsĬhapter Three–Synopsis of Eradication ToolsĬhapter Four–The Indian or Burmese Python, Python molurusĬhapter Five–The Reticulated Python, Broghammerus reticulatus or Python reticulatusĬhapter Six–The Northern African Python, Python sebae, and the Southern African Python, Python natalensisĬhapter Seven–The Boa Constrictor, Boa constrictorĬhapter Eight–The Yellow Anaconda, Eunectes notaeus, and DeSchauensee’s Anaconda, Eunectes deschauenseeiĬhapter Nine–The Green Anaconda, Eunectes murinus, and Beni Anaconda, Eunectes beniensisĪppendix.Men and women are not only themselves, Somerset Maugham writes in The Razor’s Edge (1944), “they are also the region in which they were born, the city or apartment or the farm in which they learnt to walk, the games they played as children, the old wives’ tales they overheard, the food they ate, the schools they attended, the sports they followed, the poets they read, and the God they believed in. Reed, R.N., and Rodda, G.H., 2009, Giant constrictors: Biological and management profiles and an establishment risk assessment for nine large species of pythons, anacondas, and the boa constrictor: U.S. Download the latest version of Adobe Reader, free of charge. Part or all of this report is presented in Portable Document Format (PDF) the latest version of Adobe Reader or similar software is required to view it. ![]() Because all nine species shared a large number of natural history traits that promote invasiveness or impede population control, none of the species was judged to be of low risk.Ĭenter Director, USGS Fort Collins Science Center Overall risk was judged to be high for five of the giant constrictors studied, and medium for the other four species. There is great uncertainty about many aspects of the risk assessment the level of uncertainty is estimated separately for each risk component. In addition, the risk assessment reviews all management tools for control of invasive giant constrictor populations. climates for each species, and (4) natural history traits, such as reproductive rate and dispersal ability, that influence the probability of establishment, spread, and impact. Primary factors considered in judging the risk of establishment were: (1) history of establishment in other countries, (2) number of each species in commerce, (3) suitability of U.S. The risk assessment enumerates the types of economic impacts that may be experienced, but leaves quantification of economic costs to subsequent studies. The risk assessment quantifies only the ecological risks, recognizing that ecosystem processes are complex and only poorly understood. Federal regulators have the task of appraising the importation risks and balancing those risks against economic, social, and ecological benefits associated with the importation. ![]() Although importation for the pet trade involves some risk that these animals could become established as exotic or invasive species, it does not guarantee such establishment. At present, the only probable pathway by which these species would become established in the United States is the pet trade. The nine include the world’s four largest snake species (Green Anaconda, Eunectes murinus Indian or Burmese Python, Python molurus Northern African Python, Python sebae and Reticulated Python, Broghammerus reticulatus), the Boa Constrictor ( Boa constrictor), and four species that are ecologically or visually similar to one of the above (Southern African Python, Python natalensis Yellow Anaconda, Eunectes notaeus DeSchauensee’s Anaconda, Eunectes deschauenseei and Beni Anaconda, Eunectes beniensis). Giant Constrictors: Biological and Management Profiles and an Establishment Risk Assessment for Nine Large Species of Pythons, Anacondas, and the Boa Constrictor, estimates the ecological risks associated with colonization of the United States by nine large constrictors. ![]()
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