[Re:] informative units of organization

[Thomas Schlemmermeyer]

Willi Hennig defined a species as a complex of small, related reproductive
communities which are in vicariance with each other.
But are there also SYMPATRIC subspecies (without mixed reproduction and
intergrades)?

On (         Wed, 10 Nov 1999 20:31:28 -0500),         John Grehan
<jrg13 at PSU.EDU> wrote:


>Norbert Hahn wrote
>
>In my region all four taxa
>>can be found sympatrically or in close proximity of one another. If one had
>>was to ignore the subspecific classification an immense amount of
>>phytogeographic information is lost.
>
>Perhaps that's the rock bottom of the issue. If the units of labelling are
>informative
>about the structure of the world then they are worth having, whether one might
>want to call the unit a species, subspecies or anything else.
>
>John Grehan
>


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