[Taxacom] Hygrobia (was Eurasia-Australian distribution)

Kenneth Kinman kennethkinman at webtv.net
Sun Jul 25 13:18:20 CDT 2010

Hi Jason,
       So, do you think the distribution might more likely be the result
of an association of Hygrobia with a particular kind of plant?  I read
that Hygrobia uniquely (among adephagans) contains a couple of acidic
compounds, so perhaps it depends on a plant to supply those compounds
(or their chemical precursors).  Leopoldo noted the Damasonium
distribution, but I'm not sure its distribution is quite close enough to
be suggestive of a strong association (although both apparently like
acidic ponds).
P.S. Are the species of Hygrobia in Australia common where they occur?
The Chinese species apparently is not, and might even now be extinct.

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