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This porpoise looks emaciated. The dorsal musculature is concave (both =
sides of the dorsal fin) and the skull is beginning to show a bit of a =
neck. Emaciation is a common cause of death in the winter when prey =
species such as herring are using their own fat reserves. The porpoises =
may need to eat two to three times as many fish as they would in the =
summer to obtain enough energy depending on the seasonal energy level of =
each fish. Many can not find enough to eat and begin metabolizing their =
blubber. This poses the additional problem of hypothermia because the =
blubber is an insulating layer. Blubber, of course, also helps with =
streamlining, provides buoyancy and is elastic which can help with =
swimming and therefore reducing the amount of oxygen required since the =
muscles don't have to work as hard, but I digress.
Seabirds can also become emaciated in the winter for the same reason.
Laurie Murison
Grand Manan, NB
----- Original Message -----=20
From: John Kearney=20
To: naturens@chebucto.ns.ca=20
Sent: Saturday, January 15, 2011 5:25 PM
Subject: [NatureNS] Harbour Porpoise?
I found what looks to me to be a dead Harbour Porpoise on the beach at =
Arisaig Point this afternoon. Photos are at the following link: =
http://picasaweb.google.com/j.f.kearney/MarineMammal#.
Can someone confirm the identification?
Thanks,
John=20
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<DIV><FONT size=3D2 face=3DArial>This porpoise looks emaciated. =
The dorsal=20
musculature is concave (both sides of the dorsal fin) and the skull is =
beginning=20
to show a bit of a neck. Emaciation is a common cause of death in =
the=20
winter when prey species such as herring are using their own fat=20
reserves. The porpoises may need to eat two to three times as many =
fish as=20
they would in the summer to obtain enough energy depending on the =
seasonal=20
energy level of each fish. Many can not find enough to eat =
and begin=20
metabolizing their blubber. This poses the additional problem =
of=20
hypothermia because the blubber is an insulating =
layer. Blubber,=20
of course, also helps with streamlining, provides buoyancy and is =
elastic=20
which can help with swimming and therefore reducing the amount of oxygen =
required since the muscles don't have to work as hard, but I=20
digress.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT> </DIV>
<DIV><FONT size=3D2 face=3DArial>Seabirds can also become emaciated in =
the winter=20
for the same reason.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT> </DIV>
<DIV><FONT size=3D2 face=3DArial>Laurie Murison</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>Grand Manan, NB</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"=20
dir=3Dltr>
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
<A title=3Djohn.kearney@ns.sympatico.ca=20
href=3D"mailto:john.kearney@ns.sympatico.ca">John Kearney</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dnaturens@chebucto.ns.ca=20
href=3D"mailto:naturens@chebucto.ns.ca">naturens@chebucto.ns.ca</A> =
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, January 15, =
2011 5:25=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [NatureNS] Harbour=20
Porpoise?</DIV>
<DIV><BR></DIV>
<DIV class=3DWordSection1>
<P class=3DMsoNormal>I found what looks to me to be a dead Harbour =
Porpoise on=20
the beach at Arisaig Point this afternoon. Photos are at the following =
link:=20
<A=20
=
href=3D"http://picasaweb.google.com/j.f.kearney/MarineMammal#">http://pic=
asaweb.google.com/j.f.kearney/MarineMammal#</A>.<o:p></o:p></P>
<P class=3DMsoNormal>Can someone confirm the =
identification?<o:p></o:p></P>
<P class=3DMsoNormal>Thanks,<o:p></o:p></P>
<P class=3DMsoNormal>John<SPAN=20
style=3D"FONT-FAMILY: 'Comic Sans MS'; FONT-SIZE: 10pt; =
mso-fareast-language: EN-CA">=20
</SPAN><o:p></o:p></P></DIV></BLOCKQUOTE></BODY></HTML>
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