(http://www.nzfrogs.org/NZ+Frogs/Conservation.html 04.10.2009) 2.2.2.Elukohtade hävimine Isendite arvukuse vähenemise üks põhjuseid on metsade hävimine, mis järgnes eurooplaste ja polüneesialaste tulekule. Praegu tegelevad konnade elukohtade hävitamisega talupidajad, kes soovivad uut maad. Samuti on loomadele ohtlikud teed ja lahtised põllud, mis eraldavad konnade elupaiku. Ohtlikud on ka kaevandused, sest hävitatakse konnade elupaiku, kui ka neid ennast. (http://www.nzfrogs.org/Amphibian+Extinction+Crisis.html 04.10.2009) 2.2.3.Haigused Seenhaigust Batrachochytrium dendrobatidis peetakse süüdlaseks terves maailmas toimuvale kahepaiksete suremisele. Sellega nakatanud konnad põevad chytridiomycosis-t, haigust, mis mõjutab kahepaiksete nahka ja on tihti surmav. Selle seene eosed elavad üle märjad tingimused ja seda võib kohast kohta kandamärgade riiete või saabastega. Uus-Meremaal avastati see haigus 1999. aastal eksootiliste konnade juures Canteburys.
in the world. There are really big mountain ranges like the Rocky Mountains. Also there are several deserts like Arizona desert. In USA the climate is really multifarious. It includes most of the climate types, like in one point in America there can be more than 30 degrees warm and in other point there can be -20 degrees. The United States is home to more than 400 mammal, 750 bird, and 500 reptile and amphibian species. About 91,000 insect species have been described. Satellite image showing topography of the contiguous United States 7 The people of the United States of America There are over 300 million people living in America. The United States is the third most populous country in the world after China and India. The United States has a very diverse
pdf 104 Kaitsealade külastuskoormuse hindamise juhend: seiremeetodite arendamine ja rakendamine Bennett V.J., Beard M., Zollner P.A., Fernandez-Juricic E., Westphal L., LeBlanc C.L. 2009. Understanding wildlife responses to human disturbance through simulation modelling: A management tool. Ecological Complexity 6 (2), 113-134. Blaustein, A.R., Wake, D.B. 1995. The puzzle of declining amphibian populations. Scientific American 272, 52-57. Blaustein, A.R. 1994. Chicken little or Nero’s fiddle: a perspective on declining amphibian populations. Herpetologica 50, 85-97. Cochran, W. G. 1963. Sampling techniques. 2nd ed. New York: John Wiley and Sons. Cole, D.N. 2004. Environmental impacts of outdoor recreation in wildlands. In: Manfredo, M. J., Vaske, J.J., Bruyere, B.L., Field, D.R., Brown, P.J. (eds.). Society and natural
annaabi.ee 
