Migration strategies

[Jean-Michel MAES]

English is not my language but I would be also interested in terms.
 
Migration, I understand also for long distance movement of a population with
a goal. Classical as Danaus plexippus populations from US to Mexico round
trip.
 
Round trip or not. "Migrations" of Urania from atlantic to pacific coast in
Nicaragua. I do not know why they move and I do not think they go back. Is
this migration ?.
 
Short trip with goal. Some Pieridae "migrate" by thousands from dry places
to humid places. Is this migration.
 
I think if we try to put some example it will be more easy to make
definitions.
 
Saludos a todos.
 
Jean-Michel MAES
MUSEO ENTOMOLOGICO
AP 527
LEON
NICARAGUA
tel 505-3116586
jmmaes at ibw.com.ni
www.insectariumvirtual.com/termitero/termitero.htm#nicaragua
www.insectariumvirtual.com/lasmariposasdenicaragua.htm
www-museum.unl.edu/research/entomology/workers/JMaes.htm
www-museum.unl.edu/research/entomology/database2/honduintro.htm
----- Original Message -----
From: rudy benavides <rbenavid at hotmail.com>
To: <leps-l at lists.yale.edu>
Sent: Monday, January 15, 2001 4:40 AM
Subject: Re: Migration strategies
 
 
> Thanks for all your responses which were quite varied.  Especially
> concerning the use of migration and dispersal which was used so
differently
> by some of you (on and off-list). I am comfortable in using the definition
> used by Phil Schappert in his book *A World for Butterflies  Their Lives,
> Behavior and Future*.  In it he states that "migration is a directed,
> long-distance, seasonal movement of individuals, whereas dispersal does
not
> necessarily require long distances or need to be seasonal."  Some
responses
> seemed to imply that for migration to occur, there had to be a return trip
> (the re-colonization) associated with the journey--- requiring the journey
> be bi-directional to fit the definition.  Mis-interpretation on my part...
> or can migration occur in one direction only?  I didn't want to get into a
> big definition squabble, but..
>
> Rudy Benavides
> In the Maryland Piedmont
>
>
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