flower (version 1.0)

fCV: The coefficient of variation at population level

Description

It used to quantify the pulsed flowering phenology on the population level. It has been used widely in mast seeding/mast flowering research to estimate the degree of annual variation in seed output within a population.

Usage

fCV(dd, pop)

Arguments

dd

Flowering data.

pop

ID of population.

Value

cv

measure of temporal variation in flowering

n

the number of days individual i was flowering

x

the total number of open flowers per day t and population p

t

flowering day

Details

cv=sqrt((1/(n-1))*sum(xpt-mean(xpt))^2)/mean(xpt);(t=1:n)

References

[1]Silvertown JW. The evolutionary ecology of mast seeding in trees. Biological Journal of the Linnean Society. 1980;14:235~250. [2]Kelly D. The evolutionary ecology of mast seeding. Trends in Ecology & Evolution. 1994;9:465~470.

See Also

nothing

Examples

a1=c(0,1,1,1,0,0,0)
a2=c(0,1,0,1,1,0,0)
a3=c(0,0,0,1,1,1,0)
a4=c(0,0,0,1,1,0,1)
pop=c("pop1","pop1","pop2","pop2")
ind=c("1","2","1","2")
dd=rbind(a1,a2,a3,a4)
colnames(dd)=c("D5/1","D5/2","D5/3","D5/4","D5/5","D5/6","D5/7")
C=fCV(dd,pop)
C