[R] Exponential population model

[Msindai, Nadejda]

Dear David


I think you misunderstood me, I need to find the name for an r package that models the population size from time 0 for a group of animals.


I provided details to make it clearer the type of model I want to run.


The only population model I have come across thus far is Popbio, which appears to be for plants? Therefore, can you assist me by telling me the name for a package that is used to model exponential growth:


Exponential growth model is --

?The exponential growth model assumes that the population starts out at time t=0 at some initial N(0), and growth at constant exponential rate r. If r>0 this results in theoretically unlimited growth over time.  The fundamental equation of growth is

?

?N(t+1)= N(t) exp(r)


I do not have a known growth rate figure for my species, therefore, I plan to use life history data obtained from wild populations (of one particular species) to model the current population size for a group of animals introduced onto an island.


Thank you for your help in this matter


Josephine

________________________________
From: David Winsemius <dwinsemius at comcast.net>
Sent: 27 August 2016 03:32:55
To: Msindai, Nadejda
Cc: r-help at r-project.org
Subject: Re: [R] Exponential population model


> On Aug 26, 2016, at 5:49 AM, Msindai, Nadejda <n.msindai.09 at ucl.ac.uk> wrote:
>
> Dear admin
>
> I am writing to ask for help with writing an R script to model the current population size using life history data (I do not know the intrinsic rate of increase (r)).
>
> My study population are a group of introduced chimpanzees, that were released by the Frankfurt Zoological Society in 1966-1969 onto an island in Lake Victoria.
>
> Thus I want to run a density independent population model using life history data, with 0 net migration/immigration (so this is a closed system).
>
>
> These are the individuals entering the system (in my case arriving on the island), after 1969 no new animals arrive.
>
> Year    1966    1966    1966    1966    1966    1966    1966    1968    1969    1966    1966    1966    1966    1968    1969
> Animal ID       F1      F2      F3      F4      F5      F6      F7      F8      F9      M1      M2      M3      M4      M5      M6
> DOB     1955    1955    1956    1957    1958    1959    1955    1960    1960    1958    1959    1959    1962    1960    1960
>
> Notes:  Year is the year animal was released into the population
>        F=female
>        M=male
>        DOB=date of birth
>
>
> Using the following life history data I want to estimate the population size for the year 1979, 1989, 1999, and 2014, as well as future projection for 2019, 2029 etc.
>
> Age at first birth for females: 11 years
> Birth interval: 55.2 months
> Age at last birth: 50 years (in 40-50 years only 47% of females have offspring)
> Survival to 8 years = 67.7%(Female) 51.4%(Male)
> Survival to 15 years 41%(Female) 27%(Male)
> Survival 15-40 years 18%(Female) 11%(Male)
> Survival 40+ years 7%(M/F)
>
>
>
> Birth ratio set as ___M = Male, F = Female (set as 50:50)
>

This looks like a homework question and Rhelp is specifically announced as not doing homework. See the Posting Guide.

--
David.
>
>
>
> I hope you can be of help
>
> Kind regards
>
> Josephine
>
>
>
>
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>
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David Winsemius
Alameda, CA, USA


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