# Tag Info

## Hot answers tagged population-biology

9 votes

### How is (Insect) population control through male sterilization effective

Sterile insects are typically produced by radiation. A sufficient dose is used to cause substantial DNA damage in the gametes of the males. However, this doesn't mean the sperm are completely non-...
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8 votes

### Effect of sex-ratio on the effective population size

The reason that an unequal sex ratio affects the effective population size is because offspring are produced by one male and one female parent, and an unequal sex ratio increases the rate at which ...
• 16.1k
7 votes

### Exponential growth equation and bacteria

Considering your assumption: I'm just looking at the exponential part, where the simple exponential equation works. If we assume there's sufficient nutrients for bacteria to grow unchecked for ...
• 35.5k
7 votes
Accepted

### Understanding expected mean number of breeding seasons

It's just a continuous version of the discrete calculation. The discrete version is the (infinite series) sum $$\sum_{i = 0}^\infty S^i \cdot bp$$ adding up every (chance of survival to season $i$) ...
• 1,711
7 votes

• 393
4 votes
Accepted

### Which approach is the common one in the literature for determining the bacterial growth rate?

The simple logistic function that you are using here is a fine first-order approximation for modeling microbial growth. Both logarithmic and linear scales are reasonable, with different tradeoffs as ...
• 6,977
3 votes
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### Accurate surveys of urban pigeon and bird populations

You can find population data for lots of species at The Global Population Dynamics Database, which can be used to test and fit population models. When searching for Columbidae (the dove family) I find ...
• 16.7k
3 votes
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### Predator prey interaction

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 ...
• 16.1k
3 votes

### doubt with a multiple choice question

I don't know if this is just me, but I'd consider this a pretty badly worded question. For models of population dynamics, the rate at which the size of a population changes over time is normally ...
• 3,344
3 votes
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### What type of Interspecific relationship does this graph depict?

Competition makes the most sense, IMO. For every other type of relationship, A and B should be dependent and roughly proportional: If parasites kill their host, they die in proportion. If predators ...
• 8,111
3 votes

### How has the use and subsequent ban of DDT affected insect populations?

The most thorough study on the matter appears to be entitled "Anthropogenic impacts on mosquito populations in North America over the past century". Their broad conclusion is that various mosquito ...
• 535
3 votes

### Guide to learning about Population biology / ecology / dynamics for a non-Biologist

There are three seminal works that will give you an excellent grounding in the study of dynamical systems in population biology. The first details the foundations of population genetics: Crow, ...
3 votes
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### Value of r (intrinsic rate of natural increase)

From the UN database (this info is also reported on wikipedia), the growth rate in India in 2016 was $r=1.019$. It is computed as $r = \frac{N_{2017}}{N_{2016}}$, where $N_{y}$ is the population size ...
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3 votes
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### How many giant kelp are there per square meter?

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 ...
• 425
3 votes
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### Finding population dynamics models for multi-generational species evolution with delays

You use the word "evolution" here to mean "change in populations over time", as is typical in (say) astrophysics (or, I guess, economics?). My initial comments and suggestions were ...
• 5,354
2 votes

### Software to calculate Fst from sequence data

If You are familiar with R, try package adegenet. It contains very nice tutorials explaining its usage, including the very R basics. If You require graphical interface, install RStudio - very nice ...
• 201
2 votes
Accepted

### $F_{ST}$ when considering a multi-allelic locus

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 ...
• 9,746
2 votes

### What percentage of the fitness variance is explained by the 'n'- most important loci?

This should be taken less as a holistic answer than as a case study describing an extreme example of very strong selection in a particular environmental context, yielding a particular natural ...
• 9,746
2 votes

### Expected reproduction rate of a dandelion and/or fern

Dandelions may have "from 54 to 172 seeds per head and a single plant can produce more than 2000 seeds" (https://fyi.uwex.edu/weedsci/2002/11/12/dandelion/), but the number of inflorescences depends, ...

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