Migration strategies

[Cris Guppy or Aud Fischer]

Ron,
 
What definition of "migration" do you use? Please contrast with a definition
of "dispersal". To start things off, I define "migration" of butterflies as
the movement of many adult butterflies in the same consistent specific
direction away from their place of emergence or hibernation. In contrast I
define "dispersal" of butterflies as the movement of one or many adult
butterflies in an arbitrary direction, away from their place of emergence or
hibernation.
 
Cris.
 
----- Original Message -----
From: "Ron Gatrelle" <gatrelle at tils-ttr.org>
To: "Leps-l" <Leps-l at lists.yale.edu>
Sent: Saturday, January 13, 2001 2:39 PM
Subject: Re: Migration strategies
 
 
> I sent a personal follow-up to Rudy which I will not repeat here. The
> bottom line is in the definition of terms in the minds of differing
> disciplines. Naturalists may at times use the same terms but with very
> different mental images or doctrines. (Butterfly variety vs. plant
> variety.)
>
> Lepidopteran dispersal is well know. But since the great migration of
> birders into the garden over the last 20 years "butterfly migration" has
> become an over used term in my book. Classic bird, mammal, and fish
> migrations are well known and conger up specific imagery in the minds of
> the general populous. So when "migration" is applied to insect dispersal
> the populous sees the same imagery. The problem is not the term, it is the
> definition in ones mind. Without migration the bird, mammal, or fish will
> go extinct. Thus, not only must the destinations be preserved but also the
> route.
>
> The third or fourth next step is to say that possible human induced
> environmental alterations may be interfering with cardui migration and
that
> therefore V. cardui is in-danger of becoming endangered.  Is it a rain
> forest or a jungle? Is it a baby in a humans womb or fetal tissue? Is it
> the War Department or Dept of Defense? Is it migration or dispersal? All
> the above phrases or word pairs are technically the same. But their effect
> on humans and the reactions they stimulate or pacify are very different.
> Which is exactly why the people who are running the show choose their
words
> and terms with great purpose.
>
> Of course not much of the above has anything to do with Rudy or the info
he
> is seeking. The topic just pushed one of my buttons so I editorialized.
>
> ----- Original Message -----
> From: "rudy benavides" <rbenavid at hotmail.com>
> To: <Leps-l at lists.yale.edu>
> Sent: Saturday, January 13, 2001 7:51 PM
> Subject: Re: Migration strategies
>
>
> > Ron Gatrelle wrote....   "Don't strain you eyes in Belieze to look for
> trees
> > of cardui".
> >
> >
> > The following link was sent to me off-line
> > http://www.public.iastate.edu/~mariposa/elnino.htm and raises the
> following
> > questions still unclear to me, but which maybe someone can shed some
> light
> > on.  How far south do they migrate in the sporadic years mentioned? And,
> are
> > there some trans-migratory movements between Canada/US/Mexico?
> >
> > Rudy Benavides
> >
> > Baltimore County/MD
> > _________________________________________________________________
> > Get your FREE download of MSN Explorer at http://explorer.msn.com
> >
> >
> >
> >  ------------------------------------------------------------
> >
> >    For subscription and related information about LEPS-L visit:
> >
> >    http://www.peabody.yale.edu/other/lepsl
> >
> >
>
>
>
>  ------------------------------------------------------------
>
>    For subscription and related information about LEPS-L visit:
>
>    http://www.peabody.yale.edu/other/lepsl
>
>
>
 
 
 
 ------------------------------------------------------------
 
   For subscription and related information about LEPS-L visit:
 
   http://www.peabody.yale.edu/other/lepsl