texts (e.g. 99) and even in guidelines of the World Bank. Similarly (156), the suggestion that effective population sizes below 50 lead to inbreeding depression and below 500 lead to dangerous loss of genetic variation was raised to the status of a ecosystems and regions (e.g. SIMBERLOFF a â¢â¢ â¢â¢ â¢ â¢â¢ â¢â¢ â¢ â¢â¢ â¢â¢â¢ Figure 1 superior to b â¢â¢ c â¢ â¢ d â¢ â¢â¢ â¢â¢â¢ e Proposed principles of refuge design. In each instance, design on left is viewed as design on right. Based on refs. 90 and 2 14. rule in some management circles (e.g . 107, 146). The "50" part of the rule has appeared in newspapers (e. g . 2 10). Fifty and 500 are called the "magic numbers" (209), and they have already been applied in management plans (e.g . 60) . However, the rules of refuge design and 501500 rule have been questioned recently . Each (save the first rule of refuge design-all other things being equal , a large reserve is better than a small one) has been disputed on theoretical as well as empirical grounds. Further, they have often been uncritically applied and viewed as laws rather
Annual Review of Ecology, Evolution, and Systematics – Annual Reviews
Published: Nov 1, 1988
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