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Environmental temperatures,physiology and behavior limit the range expansion of invasive burmese pythons in southeastern USA

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Integrative Zoology 2012年第3期7卷 271-285页

作者： Elliott R.JACOBSON David G.BARKER Tracy M.BARKER Richard MAULDIN Michael L.AVERY Richard ENGEMAN Stephen SECOR College of Veterinary Medicine University of FloridaGainesvilleFlorida Vida Preciosa International(VPI) BoerneTexas US Department of Agriculture Wildlife ServicesNational Wildlife Research CenterFort CollinsColorado US Department of Agriculture Wildlife ServicesNational Wildlife Research CenterGainesvilleFlorida Department of Biological Sciences University of AlabamaTuscaloosaAlabamaUSA

A well-established population of burmese pythons resides in the Everglades of southern *** in part by a report that identified much of southern USA as suitable habitat for expansion or establishment of the burmese python,we examined the plausibility of this snake to survive winters at sites north of the *** integrated daily low and high temperatures recorded from October to February from 2005-2011 at Homestead,Orlando and Gainesville,Florida;and Aiken,South Carolina,with minimum temperatures projected for python digestion(16℃),activity(5℃)and survival(0℃).Mean low and high temperatures decreased northward from Homestead to Aiken and the number of days of freezing temperatures increased *** was impaired or inhibited for 2 months in the Everglades and up to at least 5 months in Aiken,and activity was increasingly limited northward during these *** of overwinter survivorship document that a single bout of low and freezing temperatures results in python *** capacity for burmese pythons to successfully overwinter in more temperate regions of the USA is seemingly prohibited because they lack the behaviors to seek refuge from,and the physiology to tolerate,cold *** tropical Southeast Asia is the source of the Everglades burmese pythons,we predict it is unlikely that they will be able to successfully expand to or colonize more temperate areas of Florida and adjoining states due to their lack of behavioral and physiological traits to seek refuge from cold temperatures.

关键词： ambient temperature burmese python invasion snake thermal tolerance

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Ecological correlates of invasion impact for burmese pythons in Florida

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Integrative Zoology 2012年第3期7卷 254-270页

作者： Robert N.REED John D.WILLSON Gordon H.RODDA Michael E.DORCAS US Geological Survey Fort Collins Science CenterFort CollinsColorado Department of Fish and Wildlife Conservation Virginia TechBlacksburgVirginia Department of Biology Davidson CollegeDavidsonNorth CarolinaUSA

An invasive population of burmese pythons(python molurus bivittatus)is established across several thousand square kilometers of southern Florida and appears to have caused precipitous population declines among several species of native *** has this giant snake had such great success as an invasive species when many established reptiles have failed to spread?We scored the burmese python for each of 15 literature-based attributes relative to predefined comparison groups from a diverse range of taxa and provide a review of the natural history and ecology of burmese pythons relevant to each *** focused on attributes linked to spread and magnitude of impacts rather than establishment *** results suggest that attributes related to body size and generalism appeared to be particularly applicable to the burmese python’s success in *** attributes with the highest scores were:high reproductive potential,low vulnerability to predation,large adult body size,large offspring size and high dietary ***,attributes of ectotherms in general and pythons in particular(including predatory mode,energetic efficiency and social interactions)might have also contributed to invasion *** establishment risk assessments are an important initial step in prevention of new establishments,evaluating species in terms of their potential for spreading widely and negatively impacting ecosystems might become part of the means by which resource managers prioritize control efforts in environments with large numbers of introduced species.

关键词： body size burmese python Florida invasive species python molurus

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