How do I use pboot to set the level of resampling (size of each resample) in mantel()?

if I enter a value for pboot then the ulim==llim

> X<-dist(1:100)
> Y<-dist(1:100+50*rnorm(100))
> length(X)
[1] 4950
> print(mantel(X~Y,nperm=1000,nboot=1000,pboot=10))
   mantelr      pval1      pval2      pval3  llim.2.5% ulim.97.5% 
 0.1396906  0.0010000  1.0000000  0.0010000  0.1396906  0.1396906 


if I do not set a value for pboot then
 as expected ulim>llim


> print(mantel(X~Y,nperm=1000,nboot=1000))
   mantelr      pval1      pval2      pval3  llim.2.5% ulim.97.5% 
 0.1396906  0.0010000  1.0000000  0.0010000  0.1005011  0.1805416 

many thanks

Nevil Amos


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