flower (version 1.0)

SI: Flowering synchrony index of Albert et al.(2001)

Description

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

Usage

SI(dd, pop)

Arguments

dd

Flowering data.

pop

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

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)

Details

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

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

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