[Leps-l] Finally Announced: The size of the Mexican monarch overwintering colonies this past winter.

[James, David G]

Reproductive dormancy and migration is induced in monarchs that are exposed as larvae and adults to declining daylengths (> 2 minutes/day) and cooling temps.  Any population of monarchs exposed to these conditions will become migratory.  However, in southern US populations (eg Florida, far S CA) the rate of daylength change is insufficient to induce migration.
David G James
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From: Leps-l <leps-l-bounces at mailman.yale.edu> on behalf of Roger Kuhlman <rkuhlman at hotmail.com>
Sent: Thursday, May 26, 2022 8:04 AM
To: Stan Gorodenski <stanlep at commspeed.net>; Leps List <leps-l at mailman.yale.edu>
Subject: Re: [Leps-l] Finally Announced: The size of the Mexican monarch overwintering colonies this past winter.


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That some Monarchs migrate has to be because they are genetically programed to do so. They do not learn or voluntarily choose to adopt this lifestyle so yes I would say the migrating Monarch is a subspecies. In any case migrating Monarchs are important piece of Biodiversity and anything that threatens this Biodiversity is a very bad thing. Aren't we losing enough Biodiversity in the World today because of Human Overpopulation and Overdevelopment as it is?

Roger Kuhlman
Ann Arbor, Michigan
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From: Leps-l <leps-l-bounces at mailman.yale.edu> on behalf of Stan Gorodenski <stanlep at commspeed.net>
Sent: Wednesday, May 25, 2022 3:21 PM
To: leps-l at mailman.yale.edu <leps-l at mailman.yale.edu>
Subject: Re: [Leps-l] Finally Announced: The size of the Mexican monarch overwintering colonies this past winter.



On 5/25/2022 11:47 AM, Roger Kuhlman wrote:
> found there. Of course this present lack of Milkweeds can only be
> detrimental to breeding Monarch populations in our area. Take away
> masses on Common Milkweeds in the fields and open area, and Monarchs
> are bound to suffer immensely. Who says we could not lose the
> migrating Monarchs as a subspecies?

Are you saying that because they migrate they are a subspecies?
Stan

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