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Unformatted text preview: BIODIVERSITY --> ECOSYSTEM COLLAPSE Biodiversity is bad it makes ecosystems less stable and more prone to collapse simple systems are more stable Heath, 99 (Jim Heath - Australian Orchid Council Inc., 1999, Orchids Australia, WHY SAVE ORCHIDS UNDER THREAT?, http://www.orchidsaustralia.com/whysave.htm, CM) Some people say we cant afford to lose any species, no matter what species they are. Everything needs everything else , they say, to make nature balance . If that were right, it might explain why the six orchid species should be saved. Alas, no . We could pour weedkiller on all the orchids in Australia and do no ecological damage to the rest of the continents biology . But wouldnt the natural ecological systems then become less stable, if we start plucking out species - even those orchids? Not necessarily . Natural biological systems are hardly ever stable and balanced anyway. Everything goes along steadily for a time, then boom - the system falls apart and simplifies for no visible reason . Diverse systems are usually more unstable than the less diverse ones . Biologists agree that in some places less diversity is more stable (in the Arctic, for example). Also, monocultures - farms - can be very stable . Not to mention the timeless grass of a salt marsh. In other words, theres no biological law that says we have to save the orchids because they add diversity, and that added diversity makes the biological world more stable . Biodiversity makes ecosystems less stable and more susceptible to collapse increased biodiversity prevents resiliency and collapses the system Naeem, 02 (Shahid Naeem - Director of Science at Center for Environmental Research and Conservation (CERC), Professor and Chair of Columbia University Department of Ecology, Evolution and Environmental Biology, 07 March 2002, Nature Magazine, Biodiversity: Biodiversity equals instability?, pg. 23, CM) Pfisterer and Schmid  studied biomass production in a combinatorial plant-diversity experiment, which consisted of an array of replicate grassland plots that varied both in their number of plant species (from 1 to 32) and in their combination of species. The authors used their results to test the venerable 'insurance' hypothesis of ecosystem stability. This hypothesis is one of several that have featured in the long-standing ecological debate over the relationship between complexity (diversity) and stability . Over the course of this debate, the prevailing view has see-sawed between the thesis that diversity begets stability, and the antithesis that diversity either leads to instability or is irrelevant. Chief between the thesis that diversity begets stability, and the antithesis that diversity either leads to instability or is irrelevant....
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- Spring '12