[NatureNS] dead birds on causway

Date: Mon, 13 Nov 2006 17:20:30 -0400
Thread-Topic: [NatureNS] dead birds on causway
Thread-Index: AccHLnaPllhGbv8aTuC9wD/nU1HsbgAOFGNy
From: "David McCorquodale" <David_McCorquodale@capebretonu.ca>
To: <naturens@chebucto.ns.ca>
Cc: "Kellie White" <Kellie_White@capebretonu.ca>
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Today, Monday 13 November 2006, Dave Johnston and one of biology classes =
spent a couple of hours watching Northern Gannets along the Canso =
Causeway.  We estimated about 200 gannets, about 80% immatures.  This =
yearly concentration of needlefish and then the hoards of fish eating =
birds is one of the most spectacular yearly birding events in Cape =
Breton.  We missed the peak numbers, but still watching gannet after =
gannet plunge into the water was spectacular.

Also:=20
Bonaparte's Gull, about 15
Herring Gull
Ring-billed Gull, 1
Great Black-backed Gull
White-winged Scoter, 1
Bald Eagle, 3 or 4
Gray Seal, a few

After lunch we examined a few of the dead birds along the causeway:

Shearwater sp.  (had been there for many weeks)
Double-crested Cormorant, another old carcass
Northern Gannet, 10+ all immatures, most recent (probably less than a =
week)
Herring Gull, 10+, some recent, some older
Great Black-backed Gull, 10+,  some recent, some older
Common Eider, male and female, recent
Bald Eagle, 1 ad.
Saury (aka billfish, needlefish), 1 on the side of the highway

Bird kills because of the wires are a regular phenomenon in the fall and =
early winter.  My view is that high winds combined with the power lines =
lead to many birds breaking wings.  A few of these injured birds are =
then hit by vehicles, most succumb with vehicular assistance.  A very =
full crop could make it more difficult for them to maneuver through the =
wires.

In Nyanza, Vic. Co., there were still 2 male and a female Ring-necked =
Duck along with 8 Canada Geese.  Another 110 Canada Geese were at =
Baddeck Inlet.

About 80 Canada Geese and 1 Great Blue Heron were at Waycobah. =20

DBMcC

PS The Canso Causeway was opened in 1955.


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



-----Original Message-----
From: naturens-owner@chebucto.ns.ca on behalf of Jim Wolford
Sent: Mon 11/13/2006 9:37
To: NatureNS
Subject: FW: [NatureNS] dead birds on causway
=20
Mike Dadswell of Acadia University Biology says that every year at this =
time
of year there is a blocked migration of Atlantic sauries (blocked by the
causeway).  As the water temperature gradually decreases, millions of =
the
sauries end up dying there and then washing up against the causeway in a
very thick windrow of carcasses.  This in turn attracts scavenging birds
like gulls, eagles, etc.  These foraging birds are then road-killed =
along
the causeway, and perhaps the wires also play a role?

The fact that the behaviour of the sauries has not changed since the
causeway was built (1950s?) must be a testimony to how powerful the
reproduction of the species is in most years.  Surviving sauries migrate
south along the U.S. eastern caost, where their reproduction occurs.

Cheers? from Jim in Wolfville
----------
From: Jeannie <jeannies@ns.sympatico.ca>
Reply-To: naturens@chebucto.ns.ca
Date: Mon, 13 Nov 2006 07:31:34 -0400
To: naturens@chebucto.ns.ca
Subject: [NatureNS] dead birds on causway

Hi,
I counted 30 dead birds on the Canso Causeway.Does anyone know why this =
is?
Does it have anything to do with the wires?
Thank you,Jeannie=20
Jeannie Shermerhorn,Port Hawkesbury

Cottage....Cape George,Cape Breton


jeannies@ns.sympatico.ca




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