[mou] Re: Henslow's Sparrows (numbers)

[Steve G]

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On Monday, 4 Jul 2005, Jim Williams wrote:
"Can anyone offer insight into the very large number of Henslow's Sparrows
being reported in Minnesota this summer? More birds? Why? What changed? Or,
more birders? Do we simply find more once we begin looking?"

While waiting for the Prairie Warbler on Monday (in vain) at Ritter Park,
where there also are Henslow's this year, I discussed this same question
with Dennis Martin. He has a hypothesis about how the weather pattern this
April and May might have encouraged birds to overshoot their ranges, which
I'll leave to him to explain. But when he pointed out that Henslow's have
long been found in most of the limited grassland in Iowa, the fundamental
reason for their expansion seemed simpler to me: the recent change to a
warmer, wetter climate.  Not that there aren't other factors behind the
suddenness of the expansion; Brad Bolduan asked some good questions as to
whether numbers are reduced in their core range, and about what habitat the
birds are using.  But think of all the species that are doing great in
Minnesota these days - Cooper's Hawk, Red-bellied Woodpecker (but not other
woodpeckers like flicker or Red-headed), these sparrows (but not our normal
grassland birds), mockingbirds this year - what do they all have in common?


So we may no longer have moose in Minnesota (they're disappearing from NW
Minnesota because of the warming), but we'll have Henslow's Sparrows.  More
like Iowa, you might say.


Stephen Greenfield
Minneapolis
tapaculo@halcyon.ws



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