[Odonata-l] late season Iowa odonates

[Dan Bert]

Hi Steve,

I'm really surprised that your records are late dates for Sympetrum sp..
Warming has definitely occurred here in Canada and we are commonly getting
daytime highs in the mid 70's (low 20 C's) for October this year.  I saw
dozens of S. obtrusum on a hike this weekend--most were close to the end of
their lives, but some were still quite active.  W/r to the A. junius, it
could easily be a migrant, esp. given that it was flying down the main
street.  Warming could lead to more migrants selecting habitat at higher
latitudes, which alone could contribute to later records.

Does anyone have any thoughts on how higher late season daily temps could
affect emergence patterns for late season species?  For example, an average
day in September in Eastern Ontario Canada is now commonly as warm as
August, but since the variability in temps is greater in the fall, I suspect
that the risk of emerging would still be too high for sp. to shift their
emergence patterns.

Regards,
Dan



Dan Bert
Lab Manager, Phd Candidate
Geomatics and Landscape Ecology Research Laboratory (GLEL)
Department of Biology
Carleton University
email: dan.bert at glel.carleton.ca
web: http://www.glel.carleton.ca
phone:(613) 852-5318





On 10/21/07, Steve & Marcia M. Hummel <mshummel at netins.net> wrote:
>
> Hi All,
> Today I observed two species of dragonflies, the dates for both being
> new late season records. Shortly before noon an Anax junius (common
> green darner) was flying down the main street of Lake View, Sac
> County. The previous late date for Iowa was Oct 18, so this is not
> much of a change.
> Later in the afternoon on two occasions about an hour apart, I
> observed Sympetrum corruptum (varigated meadowhawk) at two locations
> in Moorehead Park, Ida Grove, Ida Co. The previous late date for S.
> corruptum was October 4th, so this is a significant change in the
> species temporal range in Iowa.
> Steve Hummel
> Lake View, IA
>
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>


-- 
Dan Bert
Lab Manager, Phd Candidate
Geomatics and Landscape Ecology Research Laboratory (GLEL)
Department of Biology
Carleton University
email: dan.bert at glel.carleton.ca
web: http://www.glel.carleton.ca
phone:(613) 852-5318
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