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Hi Jim & All, June 30, 2012
Drawing on memory 50 years dim, the sugar concentration of phlom sap =
(the target of Sapsucker activity) in trunks would be relatively high =
throughout the growing season; either going up to boost shoot extension =
or down to replenish reserves in the roots. But flow would be sluggish =
to nil during periods of moisture stress. Don't bet the farm on this but =
9% comes to mind.
Cutting a sieve tube causes almost immediate plugging of the sieve =
plate, either by flow of protoplasm, synthesis of callose or both. Back =
in the 30's (?) Crafts, Currier & Stocking (?) managed to collect enough =
Cucurbit phloem sap for sugar analysis by repeatedly making small cuts =
back from the wounded surface and collecting the fresh sap with a =
capillary tube (?). In the 60's one visiting prof at Davis (Eschrich) =
was preparing, on return to Germany, to collect phloem sap from leaves =
by using a large feeding aphid and a steady-handed assistant who could =
sever a stunned aphid from its feeding tube without damage to the tube. =
Apparently the very slow flow rates through these small diameter tubes =
are such that sieve plates remain unplugged.
I have often wondered how Sapsuckers manage to get phloem sap to =
run. Looking at an Alder with fresh holes that I collected, probably in =
late May or early June because I was fishing, years ago it suggests that =
they keep enlarging a cell until it dries up. Feeding cells are lined up =
along the axis and perhaps making a cut on the source side of the flow =
reduces plugging when subsequent holes are cut downstream of this. Just =
speculation.
Yt, Dave Webster, Kentville
----- Original Message -----=20
From: James W. Wolford=20
To: NatureNS=20
Cc: Donna Crossland=20
Sent: Saturday, June 30, 2012 2:31 PM
Subject: [NatureNS] sapsucker-hummingbird symbiosis observation
I just got this from Donna Crossland of Parks Canada, Kejimkujic Nat. =
Park. I can add to her observation that of course the oozing sap from =
the sapsucker holes attracts many insects and other invertebrates, which =
then the hummingbirds can catch and eat. Cheers from Jim in Wolfville.
Begin forwarded message:
From: Donna.Crossland@pc.gc.ca
Date: June 29, 2012 3:42:55 PM ADT
To: "James W. Wolford" <jimwolford@eastlink.ca>
Subject: Re: Beaver Roadkill, Falmouth -- what about mink??
Hi Jim! Happy Canada day!
I've just spent two wonderful days in the woods, staying at Peskawa =
camp and
conducting song bird counts. Only 2 more outings, and then I am =
finished
for this year.
My favourite moment was listening to a hummingbird overhead and =
wondering
what the attraction could be, as I had remarked that I had heard it =
in the
same area the day before.... It just happened that Mr. and Mrs. =
sapsucker
were at this tree only moments before... When I took a closer look, =
I
could see the hummingbird poking its little bill in each tiny =
sapsucker
hole... I knew about hummingbirds relying on sapsuckers when they =
return
in early spring, but apparently this symbiosis continues throughout =
the
summer(?) To my surprise the tree was red oak... wonder just what =
the
sugar content would be in oak this time of year....
Good to hear from you!
Donna
Donna Crossland MScF
Resource Management and Public Safety Specialist, =
Sp=E9cialiste en
gestion des ressources et s=E9curit=E9
`
publique
Kejimkujik National Park & National Historic Site =
Parc
national et lieu historique Kejimkujik
Parks Canada Agency
L'Agence Parcs Canada
P.O. Box 236, Maitland Bridge, NS B0T 1B0 =
C.P. 236.
Maitland Bridge, N-=C9 B0T 1B0
donna.crossland@pc.gc.ca
Work / Travail 902-682-2293
Cell / Cullulaire 902-298-0716
Government of Canada / Gouvernement du Canada
From: "James W. Wolford" <jimwolford@eastlink.ca>
To: Donna Crossland <donna.crossland@pc.gc.ca>
Cc: Jim Wolford <jimwolford@eastlink.ca>
Date: 27/06/2012 08:46 PM
Subject: Beaver Roadkill, Falmouth -- what about mink??
Donna, remember when we chatted about not seeing many mink =
road-kills? It
occurred to me later, of course, that minks are small enough that =
they will
not stay on roads long after being killed, since scavengers can =
easily get
them somewhere more safe for consumption. Cheers from Jim
Begin forwarded message:
From: fulton.harding@ns.sympatico.ca
Date: June 27, 2012 6:48:48 PM ADT
To: naturens@chebucto.ns.ca
Cc: desolatechair@gmail.com
Subject: Re: [NatureNS] Beaver Roadkill
Reply-To: naturens@chebucto.ns.ca
Yes, I saw that this morning on the way to work and it was =
still
there this evening at 6 pm when I came home. Pretty good size
beaver.
Marian Fulton
Hantsport NS
---- desolatechair@gmail.com wrote:
There was a fair sized ~20lb dead but otherwise healthy =
looking
beaver in
Falmouth at intersection of #1 and the Bog Rd this AM.
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06/25/12
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<DIV><FONT size=3D2>Hi Jim & All, =
=20
June 30,=20
2012</FONT></DIV>
<DIV><FONT size=3D2> Drawing on memory 50 years dim, =
the sugar=20
concentration of phlom sap (the target of Sapsucker =
activity) in=20
trunks would be relatively high throughout the growing season;=20
either going up to boost shoot extension or down to replenish =
reserves in=20
the roots. But flow would be sluggish to nil during periods of moisture =
stress.=20
Don't bet the farm on this but 9% comes to mind.</FONT></DIV>
<DIV>