Description Usage Arguments Details Value Note Author(s) References See Also Examples
SI4 thus facilitates comparison between species irrespective of flowering duration.
1 | SI4(dd, pop, ind)
|
dd |
Flowering data. |
pop |
ID of population. |
ind |
ID of individual. |
si4=sum(xit/bit)*pt;bit=sum(xit);t=1:n
si4 |
An alternative synchronization index of Marquis (1988). |
xit |
The numbers of open flowers per day. |
bit |
The total number of flowers of individual i during the whole flowering period. |
pt |
The proportion of all marked stems (inflorescence or individual) in bloom at day t. |
t |
Day. |
SI4 is a function of the numbers of open flowers per plant in contrast to Augspurger's measure SI2 which uses the mere information on whether a plant is flowering or not. SI4 accounts for full effects of variation in both the within-individual and the between-individual flowering patterns, and eventually includes the overlap of the individual flowering with the flowering of other individuals as an aspect of cross-fertilization (Bolmgren, 1998).
WANG,XIE
[1]Marquis RJ. Phenologcal variation in the Neotropical understory shrub Piper arieianum: causes and consequences. Ecology. 1988;69:1552~1565. [2]Bolmgren K. The use of synchronization measures in studies of plant reproduction phenology. Oikos. 1998;82:411~415.
nothing
1 2 3 4 5 6 7 8 9 10 11 12 | 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(1,0,0,1,1,0,1)
a5=c(0,0,1,1,1,0,1)
a6=c(0,0,0,1,1,1,1)
pop=c("pop1","pop1","pop1","pop2","pop2","pop2")
ind=c(1,2,3,1,2,3)
dd=rbind(a1,a2,a3,a4,a5,a6)
colnames(dd)=c("D5/1","D5/2","D5/3","D5/4","D5/5","D5/6","D5/7")
C=SI4(dd,as.matrix(pop),as.matrix(ind))
C
|
[1] "pop1"
[1] "pop1 -SI4"
pop1 - 1 pop1 - 2 pop1 - 3
[1,] 0.6666667 0.7777778 0.6666667
[1] "pop2"
[1] "pop2 -SI4"
pop2 - 1 pop2 - 2 pop2 - 3
[1,] 0.8333333 0.8333333 0.8333333
$Result.si4
n min max mean sd
pop1 3 0.6666667 0.7777778 0.7037037 0.06415003
pop2 3 0.8333333 0.8333333 0.8333333 0.00000000
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