Flowering synchrony index of Albert et al.(2001)

Description

Flowering synchrony was calculated considering all pairs of plants or poluplation.

Usage

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SI(dd, pop)

Arguments

dd

Flowering data.

pop

Research scale, such as Population, individual, inflorescence, single flowers.

Details

si=(1/(n-1))*sum(aij/bij)

Value

m

number of record days

n

number of group levels

f

names of group levels

aij

number of days on which j and i individuals are simultaneously flowering

bij

number of days on which at least one of them (j and/or i) is flowering

si

synchrony index,this index ranges from 0 (no synchrony) to 1 (flowering overlap is complete)

Note

nothing

Author(s)

WANG,XIE

References

[1]Albert MJ, Escudero A, Iriondo JM. Female reproductive success of narrow endemic Erodium paularense in contrasting microhabitats. Ecology.2001,82,1734~1747.

[2]Augspurger CK. Reproductive synchrony of a tropical shrub: experimental studies on effects of pollinators and seed predators on Hybanthus prunifolius (Violaceae),Ecology.1981,62,775~788.

See Also

nothing

Examples

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