[obol] Fern Ridge Black Terns have fledged, grebe survey

[Daniel Farrar]

Exact Aechmophorus Grebe numbers are as follows for Friday July 13th, 2007
at Fern Ridge Reservoir:

  Site Total # Clark's # Juv Total #  Fern Ridge Reservoir 620 112 183
100% 18% 30%

Juvenile Clark's and Westerns were counted together for the juv total.
Clark's were counted individually, Westerns were not.


Daniel Farrar
USACOE

On 7/14/07, DAVID IRONS <llsdirons at msn.com> wrote:
>
> I forgot to mention in my post yesterday that the first juvenile Black
> Terns
> are now out of the nest at Fern Ridge.  I saw two yesterday.  Also Daniel
> Farrar and I did a boat survey of the Western and Clark's Grebes at Fern
> Ridge yesterday (Friday) morning.  Daniel can provide the official tally,
> but we had between 500-600 total grebes, about 175 juveniles of various
> sizes.  Clark's represented about 20-25% of the total.  The count last
> fall
> count produced more individuals, perhaps due to an influx of migrants
> and
> the percentage of Clark's was much lower (about 10-15%).  We will be doing
> another survey in September, which should provide a better comparison.
>
> Dave Irons
>
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-- 
Daniel Farrar
Eugene, Oregon
jdanielfarrar at gmail.com
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