5 50 500 rule Research on minimum viable population They created the 50 500 rule which suggested that a minimum population size of 50 was necessary to combat inbreeding and a minimum of 500 individuals was needed to reduce genetic drift Management agencies tended to use the 50 500 rule under the assumption that it was applicable to species
The 50 500 rule has been used as a guiding principle in conservation for assessing minimum viable effective population size N e There is much confusion in the recent literature about how the 500 value should be applied to assess extinction risk and set priorities in conservation biology 5 50 500 EXPLAINED IN DETAIL 4 OF 16 5 Donors are allowed to count the cost of hosting refugees from developing countries as part of their ODA In 2005 for example US 585 million of France s ODA was actually refugee costs within France itself rather than direct financial assistance to developing countries 6
5 50 500 rule
5 50 500 rule
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Posed by Franklin 1980 The 50 part of the 50 500 rule states that populations with an inbreeding effective population size Nef under 50 are at imm diate risk of extinction This is because in such small populations inbreed ing and demographic stochasticity can quickly push the population i Effective population size Ne is a particularly useful metric for conservation as it af fects genetic drift inbreeding and adaptive potential within populations Current guidelines recommend a minimum Ne of 50 and 500 to avoid short term inbreeding and to preserve long term adaptive potential respectively
50 500 rule minimum viable population MVP ecological threshold that specifies the smallest number of individuals in a species or population capable of persisting at a specific statistical probability level for a predetermined amount of time Based on our review of recent theoretical and empirical evidence we conclude that the oft cited N e 50 rule for avoiding minimising inbreeding depression in the short term 5 generations and N e 500 proposed for maintaining evolutionary potential in perpetuity need to be at least doubled as do the genetically derived IUCN Red List
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These data show that certain taxonomic groups are less likely to meet 50 500 thresholds and are disproportionately impacted by human activities plant mammal and amphibian populations had a Minimum viable population MVP thresholds for assessing the extinction risk of threatened species are set in part by the 50 500 rule a guiding principle in conservation for assessing
As our review points out with extensive evidence and well supported arguments 50 is in fact too low to ensure no inbreeding depression for the majority of species that have been investigated In fact Ne 100 i e Nc 500 to 1000 is closer to the real minimum First an effective population size of at least 50 Franklin 1980 Soul 1980 has been long recommended as a rule for avoiding inbreeding depression in the short term Second N e 500 has been considered suf cient to retain evolutionary potential in perpetuity Franklin 1980 Lande and Barrowclough 1987 These two issues
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5 50 500 rule - 50 500 rule minimum viable population MVP ecological threshold that specifies the smallest number of individuals in a species or population capable of persisting at a specific statistical probability level for a predetermined amount of time