[LEPS-L:8050] Re: How many years?

[Kondla, Norbert FOR:EX]

Yes, the focus on the habitat should be the prime consideration.  If we try
to conserve every population of every organism we will be guaranteed to fail
and will be fighting the biological reality that it is perfectly natural for
populations to die out from time to time in environments that will continue
to change even when we try to play God and maintain some particular present
state. Best we can hope to achieve with present knowledge and finances is to
maintain some options for the future in the form of a reasonably complete
assemblage of habitats - such as we recognize them at least.

-----Original Message-----
From: Chris J. Durden [mailto:drdn at mail.utexas.edu]
Sent: Thursday, November 30, 2000 8:20 AM
To: leps-l at lists.yale.edu
Subject: [LEPS-L:8049] Re: How many years?


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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