Skip to main content

Questions tagged [population-biology]

Questions pertaining to populations of organisms.

23 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
6 votes
0 answers
209 views

How does the population fitness change after a change in mutation rate?

The mean population fitness as given by mutation load theory depends only on the genome-wide mutation rate ($U$). My question is: How many generations is needed to reach a new mutation load ...
Remi.b's user avatar
  • 68.3k
4 votes
0 answers
1k views

Mutation-Selection-Drift Equilibrium

mutation-selection-drift equilibrium is one of the most important concept of population genetics. I could easily find the calculations for mutation-secltion equilibrium and for mutation-drift ...
Remi.b's user avatar
  • 68.3k
4 votes
0 answers
98 views

$F_{ST}$ and the genetic variance in metapopulations

From this video (21'15''), the speaker gives the following formulae in order to calculate the between and among populations genetic variance from the $F_{ST}$: $$V_{Among Pop} = 2 F_{ST}V_G$$ $$V_{...
Remi.b's user avatar
  • 68.3k
3 votes
0 answers
94 views

Is there any example, where cooperative behaviour of predators induce fear in prey population?

I am basically from math background and doing Ph.D in mathematical biology. So I am not so efficient in biology. But my problem based on cooperative behaviour of animals during hunting which is ...
SAHEB PAL's user avatar
3 votes
0 answers
123 views

What is the effective population size of a simple two deme metapopulation?

I am confused as to how to compute the effective population size $N_e$ of a theoretical structured population. Let's consider here a simple case study. Imagine a 2-deme metapopulation. Each deme is ...
Remi.b's user avatar
  • 68.3k
3 votes
0 answers
163 views

Understanding the meaning of $s$ and $t$ in a population genetics equation

Sewall Wright in this article (1937) at the end of page 313 gives the equation: $$\Delta q = (s+tq)q(1-q) \space\space\space\space\space\space\space\space\space(1)$$ This equation is an ...
Remi.b's user avatar
  • 68.3k
2 votes
0 answers
54 views

Range for which the Verhulst-Pearl model is a good approximate

The Verhulst-Pearl model describes the growth of a population using the differential equation, $$\frac{dN}{dt}=rN \left(\frac{K-N}{K} \right)$$ where N is the population (no. of organisms), r, the ...
Elendil's user avatar
  • 123
2 votes
0 answers
35 views

Sampling of Species counting same member of species twice

As part of the biology class, we performed a sample on the number of red squirrels in a forest a few miles away from the classroom to estimate its population. When we returned to analyse our data, we ...
vik1245's user avatar
  • 579
2 votes
0 answers
27 views

Population-biology, migration-patterns, & ethology of the Big Five (elephants, rhinos, lions, leopards, & buffalo) in S. Africa's winter months?

I know that animals are unpredictable, but I also know that there are seasons in which the wildlife are more active. Now, August in South Africa is still their winter season, which is emerging into ...
Butterfly and Bones's user avatar
2 votes
0 answers
62 views

Ecological specialization and relative abundance

I am reading Evolution in Changing Environments by R. Levin but have a hard time. Claim At page 25, Levin says as a conclusion The more efficient a caste at meeting the contingency for which it ...
Remi.b's user avatar
  • 68.3k
2 votes
0 answers
365 views

Variance in reproductive success and effective population size

Background The effective population size $N_e$ is the size of the Wright-Fisher population that experience the same amount of drift than the population under consideration. The higher the variance ...
Remi.b's user avatar
  • 68.3k
2 votes
0 answers
61 views

Analytical Methods for Estimating Probability of Fixation

The probability of fixation $P$ of an allele is an very important measure and there exists several solutions to estimate this probability. Each method has its own assumptions and it is often hard to ...
Remi.b's user avatar
  • 68.3k
1 vote
0 answers
45 views

Modeling and Predicting Squirrel Populations

I was recommended to come here from the MathSE site. Here is the question: I am interested in modeling the growth of the Eastern Fox squirrel population in Los Angeles, not only in terms of numbers ...
JoanGi's user avatar
  • 11
1 vote
0 answers
16 views

Evolution equations of a 2-gender age-structure model?

This sounds a bit complicated but I want to grab more feelings on age-structured problems. Less than 2 days to the exam so I appreciate any help. So suppose we get 4 age classes in a population census ...
Yuki.F's user avatar
  • 111
1 vote
0 answers
778 views

Calculate growth rate of a population by Leslie matrix

We can calculate growth rate of a population by calculate the dominant eigen value of a Leslie matrix. What does this growth rate mean? I think that the growth rate N(t+1)/N(t) is depend on the age ...
Z. Y. Jeng's user avatar
1 vote
0 answers
36 views

How does one calculate Rx/a in population genetics?

The ratio of sex-linked to autosome mutation frequencies (R) is Rx/a =(2/3)(2+ α)/(1+ α) for X-linked genes and Ry/a = 2 α /(1+ α) for Y-linked genes. How does one calculate Rx/a, in order to find α?
Ya Boi's user avatar
  • 11
1 vote
0 answers
47 views

How many animals inhabit the United States?

How many animals inhabit the United States and its waters? Not the number of species, but the number of individual animals. And since animals are diverse, maybe we can limit the estimate to just ...
Gabe's user avatar
  • 11
1 vote
0 answers
44 views

Effective population size of a metapopulation structured on a grid

Scenario Consider a rectangular metapopulation consisting of $x \cdot y$ demes, where $x$ is the number of deme horizontally and $y$ is the number of demes vertically. The population size per deme is ...
Remi.b's user avatar
  • 68.3k
1 vote
0 answers
96 views

How important is the womb's environment?

- Background - Talking about one phenotypic trait, the total phenotypic variance $V_p$ is decomposed into genetic and environmental variance for this trait, represented by the symbols $V_G$ and $V_E$ ...
Remi.b's user avatar
  • 68.3k
0 votes
0 answers
20 views

Why might allele frequencies change over many generations at neutral loci?

Lets say that a research team is looking at natural insect populations (e.g. beetle), and they find that allele frequencies at a locus in the genome have changed over the past few generations even ...
BananaGrams's user avatar
0 votes
0 answers
22 views

The evolution equations under different year classes of a age-structured model?

This sounds a bit complicated but I want to grab more feelings on age-structured problems. Less than 2 days to the exam so I appreciate any help. So suppose we only get 3 year classes in a school at ...
Yuki.F's user avatar
  • 111
0 votes
0 answers
141 views

How can we calculate the constants of the SIR model?

I am not a biologist by profession, but I am attempting to implement a simple SIR model from the following paper. The paper assumes the following constants are known: rc = growth rate of ...
Edv Beq's user avatar
  • 109
0 votes
0 answers
28 views

Could there be latent infections in the human population that we don't know of?

Herpes simplex 1 virus and toxoplasmosis are common infections that that many of use have (65% and 10% of americans, respectively). Both of these are chronic, latent infections that can occasionally ...
Kevin Kostlan's user avatar