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The reading passage indicates three possible solutions of stop cane toads from spreading in Australia. However, based on the listening, none of the measures mentioned in the reading is successful and might cause unwanted environmental damage.
First of all, the reading claims that building a national fence can be effective in prevent the proliferation of cane toads. However, the professor’s lecture contradicts what the reading maintains. She argues in the lecture that a national fence will not stop the spread of toads for the reason that young toads and their eggs are found in rivers and streams. At some point there will be rivers and streams that flow from one side to the other. Such waterways can carry toads and eggs to the other side. Since a few young toads and toad eggs can establish population on the other side, the effectiveness of a national fence cannot be guaranteed.
Secondly, the author of the reading holds the opinion that toads can be eliminated by volunteers. But the professor in the lecture refutes this point by saying that these untrained volunteers would destroy native frogs which are endangered species. It is because distinguishing frogs and cane toads is not easy, especially when they are young.
Finally, from the reading, we know that a disease-causing virus developed by researchers can go a long way in controlling the cane toad populations. In contrast, the listening challenges this viewpoint. It contends that using virus is a bad idea because such method would cause terrible consequences for cane toads in Central and South America. Although Australia is far away from cane toads’ original habitats-Central and South America, some researchers and pet collectors would transport the virus to another continent. Once the virus carried by animals reached Central and South America, it would attack those native cane toads and destroy their populations. That would be an ecological disaster because in the Americans cane toads are native species and a vital part of the ecosystem. As a result, the whole ecosystem would suffer.