[NatureNS] Ipswich Sparrow kill, "black-backed robin"

Date: Sun, 03 Apr 2011 15:43:08 -0300
From: iamclar@dal.ca
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All:

Bernice and I did a rather lazy tour of the E. Shore, but did walk on  
the Hartlen Pt. harbourside beach, where we met Rita Viau. Rita had  
found a Sanderling there - a winter resident? migrant?

When we walked back to admire four spanking Ipswich Sparrows, a  
Sharp-shinned Hawk appeared out of nowhere, snatched one, and whizzed  
off to distance spruces. The sparrows, adapted for life in the  
bleached dune grasses in winter, were feeding on the dark seaweed on  
the beach - risky business. Incidentally, a couple of days ago I heard  
from an environmental scientist in Virginia that the outer-island  
beaches there had been so devastated by storms this winter, that there  
were very few wintering Ipswiches, and many were feeding for the fist  
time in his experience at tidelines. Precipitation (as a surrogate for  
bad weather) and population size (counts in early fall on Sable I.)  
are statistically significant negative influences on overwinter  
survival.

At 3-Fathom Hbr. we came across four robins foraging on a lawn.One was  
a "black-backed" male. I put a photo of it on NS-RBA photos at the end  
of the "other passerines" folder.

I've discussed this black-backed form before, so forgive me if . . .  
You'll see that the photo'd one is pretty dark-backed, tho' not as  
dark as some. More striking is its almost black throat. These birds  
were formerly thought to be a distinct subspecies, _nigrideus_, and  
sometimes wrongly called "Newfoundland" Robin (rare in insular NF).  
Sibley refers to their range as "Atlantic Canada", which is not quite  
right. But, they do nest widely, even in NS. Black-backed birds are  
probably almost "pure" in northern Ungava, but don't have the  
well-circumscribed range expected of a true subspecies.

Cheers, Ian
Ian McLaren

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