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The quantity $r$ must be a frequence, measured in hours $^{-1}$. So it cannot be measured in bacteria/hour/cell. If the number of bacteria is multiplied by 4 each hour, this means that $\exp r= 4,$ or $r= \ln 4$ , or 1, 39 per hours.

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One is a recurrence equation and the other is a general solution. These are basic concepts of mathematical modelling. Reccurence equation A recurrent equation describes the state of a system (here, heterozygosity $H$) at the next time step given the state in the previous time step. The recurrence relation is $H' = (1-1/2N)\times H$. Given the state $H$, ...

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I am a bit wobbly on the subject, but I think the most important bit of information is that they are re-parametrising Wright's (1951) hierarchical analysis of variation, "F-statistics," "hierarchical partitioning of variation," or "population parameters," depending on whom you ask. The parameters correspond as follows (on the bottom of p.1358): Fit=F, Fis=f, ...

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You can try to use some standart data sources, for example: NASA's Gridded Population of the World - LINK Geonames - LINK

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I disagree with GForce's explanation; the meaning is not that growth of prey populations causes instability in predator species. The sentence is merely saying that without predation, prey population growth is more likely to be at a level which leads to ecosystem instability. The term "but for predation" means "if it wasn't for the effects of predation". In ...

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It's essentially saying that high densities of prey species can cause ecosystem instability not only for themselves but also for the predators which prey upon them. In other words, high densities of prey species not only cause ecosystem instability by competing with each other, but this instability can move up the food chain and affect predators at higher ...

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