[R] Exponential population model
n.msindai.09 at ucl.ac.uk
Mon Aug 29 16:06:30 CEST 2016
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
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
> 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.
> I hope you can be of help
> Kind regards
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