NY Times Butterflying Article

[David Webster]

Hi Rudy & All,
As evaporation removes water from the surface, there will be mass flow of  water
and solutes towards the surface. So solutes will tend to concentrate at the
surfaces, that are exposed to evaporation, of any porous body as it dries.
DW, Kentville, Nova Scotia
Rudy Benavides wrote:

> Wanda Dameron wrote:
> >A good article you may wish to read:    Cheers, WD
> >
> >http://www.nytimes.com/2001/06/08/living/08OUTS.html
>
> Interesting that the article mentioned Red-spotted Purples (Limenitis
> arthemis astyanax) and salts from excrement.  Just a few days ago I almost
> stumbled on three Red-spotted Purples that were settled on dog excrement.
> What surprised me was their selection of the possibilities available to
> them.  All three were intent on a pile that was much drier in comparison to
> other more recent moist offerings just a few feet away (including that of my
> own dog).  So my question to the group is, does it get saltier as it dries
> out?
>
> Rudy
> Maryland
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