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the replication. Thus its influence is factorized out in the first option or randomized across treatments in the second. 8 All o ...
17 Conservation in theory In this chapter we deal with theory that has been developed to account for why and how populations bec ...
Now consider a subset of this population restricted to a reserve of 200 km^2. The density of 0.01/ km^2 translates to a populati ...
demographic variation between individuals, even when those individuals are in the peak of health and the environment is entirely ...
Genotypes A 1 A 1 A 1 A 2 A 2 A 2 Genotypic frequencies p^22 pq q^2 = 0.01 0.18 0.81 Note that the genotypic frequencies (propor ...
unstable statistic tending to increase as sample size increases. We recommend against its use. The level of heterozygosity withi ...
additive genetic variance is by far the most important and for present purposes can be discussed as if it constituted the total ...
which may alternatively be written: Ht=H 0 e−t/2N After t= 2 Ngenerations the population’s heterozygosity will have dropped to 0 ...
Suppose the A 1 is a recessive, its effect being masked by A 2 when the two occur together at the locus. If additionally A 1 is ...
Is the cheetah in peril? It is possible that as a direct consequence of the low heterozygosity the cheetah produces sperm of low ...
of offspring produced per individual, the effective population size will be smaller than the census size. In the unlikely event ...
is a linear function of the proportion of females in the population. The regression of ∆Non Pfhas a slope of Npband an intercept ...
quantitative phenotypic variation is inherited and 50% is environmentally induced). The figure of 0.5 is the heritability coeffi ...
CONSERVATION IN THEORY 301 50 45 40 35 30 Year Number of female grizzlies 1960 1965 1970 1975 1980 Fig. 17.2Population dynamics ...
many times suggests roughly an 8–10% risk of extinction within the next century, or one extinction event every 10,000–20,000 yea ...
the danger zone. The peak and spread of this curve depends, obviously, on the mean rate of growth, as well as the variance. The ...
1980s proved to be a false alarm, at least in this case, as one might expect in the majority of cases (>90%). Nonetheless, th ...
data on grizzly bears might allow us to make reliable estimates of extinction over the next 5 or 10 years, but certainly not ove ...
The three most common causes of driven extinctions, roughly in order of import- ance, are (i) contraction and modification of ha ...
where Brepresents the density of the endemic prey species, Rrepresents the density of the exotic prey species, and Crepresents t ...
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