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The density of Macrocystis pyrifera is pretty variable. According to Dayton et al. 1984 off of the Southern California coast it can range from less than 0.1 to to 1.0 $individuals/m^2$. The variation depends on the location, where there are different exposure levels to high energy waves, upwellings containing nutrients, and predation by sea urchin. Dayton, P....


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Minimum number of individuals needed to start a population But could just one woman be the progenitor of a healthy nation? And, if not, what is the minimum number of distantly-related individuals required? Healthy is a pretty subjective term, and it's perhaps easier to think of things in terms of a minimum viable population, which is more about straight ...


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The breeding lifespan of an individual is (maximum life span $L$ - age of sexual maturity $M$). Call the time between pregnancies $\tau$ and the gestation period $g$. Then the average number of pregnancies per (female) individual is then $(L-M)/(\tau+g)$. If the average number of individuals per pregnancy is $N$, then each reproducing individual produces $N(...


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Expanding on @heracho's answer and Wikipedia, assume pi denotes the probability of having (exactly) i children, and that dm denotes the probability of extinction by the mth generation (note that this includes extinctions by all generations n with n < m). Then dm can be expressed as: $\displaystyle d_m = p_0 + p_1 d_{m-1} + p_2 d_{m-1}^2 + p_3 d_{m-1}^3 + ...


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Short answer: yes, people have formulated ways to estimate $F_{ST}$ for multiallelic loci, e.g. microsatellites. For a review, see here. Specifically, Nei could define $F_{ST}$ for multiple alleles as $F_{ST} = \frac{(H_t - H_s)}{H_t}$, which is to say the proportion of total heterozygosity that is across rather than within populations. This is agnostic to ...


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Based on the IUCN Criteria for endangered status there are two broad categories of models to help in determining endangered status. Note that no one methodology is used to determine the status of any species. Rather, a panel of experts consider all available evidence (including numerous modelling studies) and essentially make a determination based on their ...


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