[NatureNS] Study about Monarch migration

Date: Sat, 24 Aug 2019 13:28:05 -0300
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On 24 Aug 2019 11:42, Larry Bogan wrote:
> Hi,
>   Only the abstract of the University of Chicago article about
> Monarchs is free. However, Andy Davis at the University of Georgia 
> has
> a Blog describing the reasearch. See his June 24 Blog on his website
> http://monarchscience.org . I would recommend reading many of his
> other blogs about Monarch Science. (There are several about Nova
> Scotia there)
>
>  There has been some reservations about the rearing of Monarchs being
> of value to migrations for several years now. This article emphasizes
> that commercial Monarchs are different. I think there has to be a 
> more
> definitive experiments about the eclosing indoors effecting the
> migration pattern of the Monarch. In the experiment, they placed the
> pupae in an incubator.
>
>  Alison and I rear our Monarchs on the plants where we found them and
> let them wander at will, and only restricting them when they reach 
> 5th
> instar. Our enclosure is large and near large windows with natural
> light.
>
>  This year we are bringing fewer inside and flagging chysalis in the
> field and monitoring them. A large fraction of them get into trouble
> from predation and attaching to things like grass and dead leaves 
> that
> fall off plants. In those cases we rescue and allow them to eclose
> inside by attaching them to study supports. At the moment we have
> nearly 50 chrysalis flagged in the field and have released over 50
> reared inside. We have at least over 50 in caterpillar stages.
>
>  We saw a greater return of Monarch butterflies this year although
> the were late due to the cool June. The Monarchs are a couple weeks
> behind where they were last year and there will not be two 
> generations
> reared this year.
>
> I will give a more completer report later.
> Regards,
> Larry
>
>
There was a Monarch on my Brown-eyed Susans this morning..the first 
I've seen this year.   French Cove, Rich. Co.
Billy
> --
> Larry Bogan
> <larry@bogan.ca>
> Brooklyn Corner, Nova Scotia
>
> //////////////////////////
> On Fri, 23 Aug 2019 20:55:37 -0300
> Lois Codling <loiscodling@hfx.eastlink.ca> wrote:
>
>>
>> Larry and others will be interested in this study.  If you look at 
>> the
>> link, the article is near the bottom of the page.
>>
>> Lois Codling
>>
>>
>>     Monarch migration aggravation
>>     
>> <https://world.wng.org/content/time_to_get_over_darwin/#monarchs>
>>
>> Soon the monarch butterflies of North America will begin their 
>> annual
>> fall migration to the warmer climates of California or Mexico, where
>> they will winter until their return next spring. Over the past two
>> decades, the number of North American monarchs has dwindled by 90
>> percent. To boost their numbers, hobbyists raise large numbers of
>> monarchs, and commercial breeders sell them for school children to
>> release. But a study <https://www.pnas.org/content/116/29/14671>
>> published July 16 in the /Proceedings of the National Academy of
>> Sciences/, showed that captive breeding disrupts monarchs’ migratory
> ......

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