[LEPS-L:8049] Re: How many years?

[Chris J. Durden]

Hang in there. Don't give up hope. Even if *H. leonardus* is no longer
there, the rest of the community is! The rest of the community is just as
important as the "lost" component. For example do you know the status of
all the Collembolan species in the fauna of this community? The rest of the
community contains other species that are on the edge of local extirpation
and are equally worthy of our conservation efforts. If the community is
conserved, *H. leonardus* may rejoin it through colonization from another
more successful population.
..........Chris Durden

At 07:57  30/11/00 -0500, you wrote:
>In reading T. Eichlin's note on the Chestnut Borer was it actively sought
year after year or even intermittently in the places where it was finally
rediscovered.
>
>We are following two sites that formerly had colonies of Leonard's Skipper
(Hesperia leonardus) where none have been recorded in two and six years.
Both sites still exist although management practices (increased mowing)
have occurred.  How many years would one need to monitor these sites (late
August visits) before accepting that the species is gone.
>    And if it were to show up there in the future, what criteria would be
useful for distinguishing between: recolonization and "it was there all
along but we missed it".   M. Gochfeld
> 


 
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