Abstract
Lake Victoria, the largest lake in Africa, was once a high quality food source as well as an important field site for studying evolutionary processes. Not any more. The Ugandan government decided to improve the fishery several decades ago by introducing hearty and cacheable perch from the Nile River.1 It turned out, however, that these fish can reach monstrous proportions (up to 6-1/2 feet and 175 pounds) with an appetite to match. About 10 years after these perch were introduced, they began showing up in increasing numbers in the nets of fisherman trying to catch any of the 300 varieties of smaller, more desirable fish in the lake. Soon, the perch wiped out almost two-thirds of the fishery and left a number of the individual species extinct.
For this example (p. 51) and the others to follow, I am indebted to the excellent work by Noel Simon, Nature in Danger. Threatened Habitats and Species (New York: Oxford University Press, 1995).
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Sirotnik, K.A. (2005). Ecological Images of Change: Limits and Possibilities. In: Lieberman, A. (eds) The Roots of Educational Change. Springer, Dordrecht. https://doi.org/10.1007/1-4020-4451-8_10
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