All: We have followed up on the previous correspondence about looking at Redbud tree seed set to gain understanding about variation in pollination rates. We
Message 1 of 1
, Nov 19, 2010
We have followed up on the previous
correspondence about looking at Redbud tree seed set to gain understanding
about variation in pollination rates. We have been in contact with
Isaac Park who is looking at Cercis ecology and historical bloom patterns
and talked about some general ideas and ways of evaluating the data.
In that regard Sarah Fisher (super intern)
played around with some data from a few trees in the area.
Attached is a pdf with the results (sorry
about the formatting it was originally meant only for Isaac's eyes, but
some of you may be interested).
Bottom line is that with measured several
hundred seed pods on 4 trees in a small suburban wooded yard and found
that the average number of ovules in each tree was:
Ovules, being locations within the pod
that COULD have had a seed.
The average number of seeds was:
The proportion of missing seeds in each
We looked at sets of 15 pods in each
of the 8 primary compass directions and as you can see in the table in
the attached file there are indications of a tree effect in terms of proportional
We also gathered information on an additional
3 trees in the DC area (we have more to go) and found similar seed set.
Here is where you come in.
So, we would be interested in seeing
what seed set was like elsewhere in the country (is it similar to the above
or are there places where it is very low or very high). Redbuds still
mostly have their pods on their trees at this point, so if you have a tree
nearby and want to contribute here is all you need to do:
1. Choose a branch as close as
possible to head height for you.
2. Pull the first 20 seed pods
from that branch starting at the tip and working your way back.
3. Include both the long and short
4. Open up each pod and count
the number of ovules (the place where a seed should be...this should be
obvious) and the number of seeds and email that information back to:
Here is a reasonable format.
Name: Jane Treehugger
Location: 3 miles east of the
interesection or road 334 and 47 in West Mills, KY on highway 47
(optional...you could send us a lat/long)
Height: About 22 feet
Habitat: Along the roadside
Overstory: No overstory...in the
If anything interesting shows up we
might expand this ... but for now we just want some simple seed set information.
Planted or wild trees are both fine.
Alternatively, you can send the pods
Sam Droege sdroege@...
w 301-497-5840 h 301-390-7759 fax 301-497-5624
USGS Patuxent Wildlife Research Center
BARC-EAST, BLDG 308, RM 124 10300 Balt. Ave., Beltsville, MD 20705 Http://www.pwrc.usgs.gov
If trees could scream, would we be so
cavalier about cutting them down?
We might, if they screamed all the time, for no good reason.
- Jack Handey
Bees are not optional.
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