[tn-dragonflies] Re: some numbers
- From: kjchilds <kjchilds@xxxxxxxxx>
- To: "tn-dragonflies@xxxxxxxxxxxxx" <tn-dragonflies@xxxxxxxxxxxxx>
- Date: Mon, 11 Mar 2013 12:47:04 -0700 (PDT)
It's hard to believe that Lake Co has only 14 records. That area must be rich
in odes but not in ode-ers.
Ken Childs
Henderson, TN
Chester County
http://tinyurl.com/FinishFlagFarmsMoths
http://www.finishflagfarms.com
________________________________
From: "Rconnorsphoto@xxxxxxx" <Rconnorsphoto@xxxxxxx>
To: tn-dragonflies@xxxxxxxxxxxxx
Sent: Monday, March 11, 2013 2:37 PM
Subject: [tn-dragonflies] some numbers
Checking the Odonata Central
database back in January I looked at the numbers, and it looks like we have
been busy documenting
dragonflies and damselflies TN counties over the past
year.
For the 95 TN counties the average
as of January is at aprox. 34.5 species per county, up from aprox 30 spp per
county last time I checked. Now there’s only “21 under 21”, 21 counties with
less than 21
species, but there are still 6 “basement” counties with 10 or
less.
This is not up to the butterfly
records, but I think we Ode-watchers are fewer and have not been at it as long
as the Butterfliers. We should be able to reach a county average for Odes of
50+, as is currently the case for Leps, but it will take a while. The curve
flattens out once the threshold number of species, probably about 30 for odes
as
well as for butterflies, and it takes more time per species to add to the
list.
Some counties are harder to access,
smaller and/or farther from population centers, thus being the least surveyed.
NWTN, for example, is as under-surveyed
for odes as it is for leps. But the "low hanging fruit" should be there for
anyone with the time to target it.
Our top county continues to be
Blount at 86, and with just 14 more needed, it is within striking distance of
100 spp. It would be nice to see one TN county reach the century mark soon.
Other counties with less than 30 needed to reach 100 would be Sullivan,
Cumberlandand Davidson.
A checklist for the 156 species of
TN odes is still available at the TN State Parks website, as well as checklists
for 30+ State Parks/counties that Dr David Hill and I put together :
http://www.tn.gov/environment/parks/atbi/checklists/
If interested, see 2 lists attached
in Word arranged from least to most documented, & by counties in
alphabetical order.This
list is also posted at my Pbase website:
http://www.pbase.com/rconnorsnaturephoto/image/121501748
(here we reach the limit of my
tech abilities & computer skills…)
Odonata Central continues to be the
best resource and clearing house for odonate records and I encourage you to
continue documenting and submitting records.
Enjoy the 2013 season!
Richard Connors
Nashville
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