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

In flower: Tools for characterizing flowering traits

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.

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

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

Example output

[1] "Result:S_mean= 0.75 S_sd= 0.35"
$m
[1] 7

$n
[1] 2

$f
[1] "pop1" "pop2"

$aij
     pop1 pop2
pop1    4    2
pop2    2    4

$bij
     pop1 pop2
pop1    4    4
pop2    4    4

$time
pop1 pop2 
   4    4 

$si
   pop1 pop2
Si  0.5    1

flower documentation built on May 1, 2019, 9:27 p.m.