Dear Josephine
I think you may easily build such a model with the mmage package
available at http://livtools.cirad.fr/mmage
Best Regards
Matthieu
On 29/08/2016 16:06, Msindai, Nadejda wrote:
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 <dwinsem...@comcast.net>
Sent: 27 August 2016 03:32:55
To: Msindai, Nadejda
Cc: r-help@r-project.org
Subject: Re: [R] Exponential population model
On Aug 26, 2016, at 5:49 AM, Msindai, Nadejda <n.msindai...@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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David Winsemius
Alameda, CA, USA
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--
Matthieu Lesnoff
CIRAD
Campus de Baillarguet
TA C-112 / A (Bât. A)
34398 Montpellier Cedex 5
Off.: +33 4 67 59 38 66
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E-mail: matthieu.lesn...@cirad.fr
______________________________________________
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