Wow that's a lot of Louisiana  water thrushes!  Interesting and timely post Hans. 

Sent from my iPod

> On Apr 27, 2015, at 8:35 AM, Haans Petruschke <[log in to unmask]> wrote:
> 
> Hi,
> 
> During our bbs survey hike up Stebbins' Run (~ 41deg 36min N, 81deg 16 min
> W)  yesterday we found 9 Louisiana Waterthrushes in 6 distinct territories,
> over a 1.8 km length of stream bed.  The territories are remarkable in the
> regularity of their spacing of about 300m.  We can determine boundaries
> because the birds will move up stream ahead of us to the edge of their
> territory and then will fly back past us.  The boundaries are also distinct
> features such as a waterfall or side run.  I also mark each location as a
> point using GPS and can review the location data later.
> 
> Louisiana Waterthushes are now fully established on nesting territory over
> most of their range.  They are among the earliest and most regular warbler
> migrants we find, and are found on or about the first of April in northern
> Ohio.
> 
> Louisiana Waterthushes are a habitat specialist and make their living in
> and around running water with a rocky or gravel bed. They are seldom if
> ever found along still waters which are the realm of the closely related
> Northern Waterthrush.  Also northern Ohio and and southern Ontario are the
> northern end of the breeding range for Louisiana Waterthrush and the
> southern end of the breeding range for Northern Waterthrush.
> 
> As previously stated extreme care is needed to identify a Louisiana
> Waterthrush found in inappropriate habitat after the 3rd week of April. Due
> to the similarity and often overlapping morphology of the Waterthrush
> species this should only be done if you are very familiar with Louisiana
> Waterthrush after extensive study becoming familiar with all their
> vocalizations in the appropriate habitat. The probability far and away
> favors any Waterthrush found along a lake, pond or marshy area being
> Northern, in spite of what you might find on eBird.
> 
> Haans
> 
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