The Australian Cane Toad Essay Research Paper — страница 4

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challenge experiments is a spectrum of “microbiological, serological, and molecular studies to characterize and compare the agents under investigation, to establish information on the host’s resistance to infection, and to gather information related to similar agents in toads and other amphibian populations.” Should an agent be found which offers the potential for control of the toad, an extensive series of subsequent studies is planned. To achieve the objectives of the project, amphibian populations from around the world are being studied for possible infectious agents. An international network of scientists, scientific institutions, interest groups and interested individuals is being developed for information exchange relating to diseases and population declines of

amphibians. Potential for biological control of the toad is considered good, as the toad is the only representative of the bufonid family in Australia and is distinct from other Australian amphibian species. In addition, many species of the genus Bufo exist overseas, offering exciting prospects that an infectious or parasitic agent from these may cause disease in Australian Bufo marinus, without affecting native species. It is hoped that these studies will provide valuable information on “the causes of, and initiating factors behind, the recent declines in frog populations in Australia, Britain and elsewhere.” Also, to contribute to the possibility that an infectious agent might be found that would control cane toads in Australia. They are constantly looking for possible

pathogens for consideration for the biological control of cane toads. Finally, Chinese medicine manufacturers have been using the toads for centuries in the treatment of Cardio Vascular Diseases and Cancer treatment. It is highly likely that the cane toad will one day be farmed in Queensland for production of therapeutic medicines. Conclusion There is still much work to be done to fully understand what effects cane toads have on native wildlife, and just how far they can spread. There are some reasons for optimism. In the areas where cane toads have been around for the longest time, their populations have declined after the initial population explosion. It is also possible that some native animals are learning to avoid eating them. Other animals have shown they can eat the toad.

The Keelback Snake can detoxify the venom and Water Rats, Ibis, Crows and other birds turn the toads over and eat only the non-poisonous internal organs. Opinion is divided concerning their current status, some think the native wildlife is starting to recognize them as a threat and they stay away. Australia is still a long way from controlling cane toad numbers or putting a stop to their expansion. Scientific evidence suggests that this “imported animal represents a nuisance to man and an ecological threat to the Australian environment.” The rapid growth of the species may have consequences in areas considered irrelevant at the time of its introduction. The cane toad has provided a painful lesson in what can happen to native species when an exotic species is introduced to a

new habitat. 337