[NatureNS] Goldfinch and Earwigs

Date: Thu, 19 Nov 2009 10:31:36 -0400
Thread-Topic: Goldfinch and Earwigs
Thread-Index: AcpovNC4VtHCFzHVSbG3Yxw/IhSALAAaC8C5
References: <7C697C2CF39E4B76A960AB50127A99F3@D58WQPH1> <6.2.3.4.1.20091118215729.01ed7b10@pop1.ns.sympatico.ca>
From: "David McCorquodale" <David_McCorquodale@cbu.ca>
To: <naturens@chebucto.ns.ca>
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Goldfinch feeding:

There are three American Goldfinch feeding on White Birch seeds in my =
yard.  Also in my field of view is a nyger seed feeder that has not been =
bothered by goldfinches for more than 2 months (mid-September).  I had =
not noticed the abundance of birch catkins until the leaves were all =
finally blown off a couple of weeks ago.  Here in eastern Cape Breton =
White Spruce and White Birch both have significant seeds crops.  My =
guess is that goldfinches and siskins will only occasionally visit =
feeders until it gets much colder and the birch and spruce seed stock is =
much reduced.

An aside about the large crop of cones on Balsam Fir and White Spruce in =
Cape Breton.  Usually large conifer cone crops attract White-winged =
Crossbills.  Often they arrive in late June while the cones are still =
green on the trees.  However I have seen and heard about few crossbills =
this year.  It is difficult to find a spruce that is not laden with =
cones, but there are even fewer crossbills than barren spruces. =20

Some earwig notes:

Most students react with disgust to earwigs, a big ICK! factor.  For =
more than 15 years I have been trying to get my entomology students to =
convince others that earwigs should be revered (well at least =
respected).=20

Humans generally think maternal behaviour is a plus.  Among insects =
earwigs, including the European Earwig that is so common in most areas =
with lots of people in Nova Scotia, look after their young far more than =
most.  Females construct a little tunnel in a dark damp place.  In the =
tunnel she lays eggs.  Dark, damp places have lots of fungi.  Many fungi =
readily =91eat=92 insect eggs.  How to protect the eggs?  Female earwigs =
groom their eggs.  They lick them, eating the fungus that might have =
started growing on them.  As well their saliva has antibiotics in it =
that slow the growth of fungi on the eggs.  This often continues through =
the first larval instar as well.

I also think earwigs get a bad reputation for other reasons.  They do =
not harm to people.  As far as crop damage or damage to gardens, their =
role is usually minor  Often they feed after another pest has started =
the problem.  They have relatively weak mandibles and feed almost =
exclusively on very soft food.  For example in sweet corn they do not =
eat kernels unless something else has broken the surface to allow them =
access.  So when you pick a cob and it has several earwigs, they have =
just moved in to take advantage of food that perhaps a corn earworm (a =
caterpillar) has made available for them.

DBMcC

PS I have considered, but so far have not acted upon my intention to get =
a job as a full-time publicity agent for earwigs.


DB McCorquodale
Department of Biology, Cape Breton University
1250 Grand Lake Rd., Sydney, NS B1P 6L2
902-563-1260  david_mccorquodale@cbu.ca



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