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New  - January  2010 samples from the Willamette River at Albany,

February 2010 samples from the Willamette River at Albany,

Late March, 2010, Willamette River at Albany

see bottom of this page

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Photo below,  Willamette River at Portland, Oregon,  in summer, near the entry into the Columbia River, and about 20 miles downstream from Willamette Falls.


-Willamette River, Portland, Oregon, same location

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  The Willamette River (above)  enters the Columbia River at Portland, Oregon, about 100 miles upstream from the ocean at Astoria.  Tides affect both rivers up to and beyond Portland.    Willamette Falls, about 26 miles upstream on the Willamette, has a drop of about 42 feet, and a flow of about 5000 cubuc feet per second.  

    The Lower Willamette would thus seem to be quite separated ecologically from the river above the falls.  Ocean tides raise and lower water levels about 3 feet at the falls. 

The report on the link below gives details of the ecology of the lower Willamette.

(Report with useful  pictures of specimens collected from the lower river, plus other information}.(http://www.portlandonline.com/bes/index.cfm?&a=76769

Link of general interest regarding the terrestrial ecology of the region.http://www.fs.fed.us/pnw/pubs/gtr512.pdf

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For purposes here, the upper  Willamette extends  from the falls (mile 26) for about a hundred miles to Corvallis, Albany, and beyond.

The Photos and videos below are from the general area of miles 120-140 (Albany-Peoria).

Heptageniidae dorsal pattern,

(see  list of Heptageniid
species
reported from the Willamette
River below. Identification
 of specimen below pending)
videoHeptageniidae ventral-labrum

Also Tricorythodes above.

P7230084 Hept group albany ore.AVI

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(http://www.portlandonline.com/bes/index.cfm?&a=76769) Willamette, with pictures of specimens


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"Upper" Willamette River, Albany, Oregon---------------------------------------------------------------------------------------------------------------------------

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Mayflies of the Willamette River, from Meyer and McCafferty, 2007.

(9 Families, 16 Genera, 20 species, 7 species shared with Saskatchewan River)

Ameletidae

       Ameletus exquisitus Eaton

Ametropodidae

      Ametropus ammophilus Allen, Benton Co.,   Mary's River (presumably from the Willamette as well)

Baetidae

      Acentrella insignificans (McDunnough) (also in Saskatchewan River)

      Acentrella turbida (McDunnough) April-July (also in Saskatchewan River)

      Baetis notas Allen and Murvish  June-July

      Diphetor hageni (Eaton) widespread and common, one record from Willamette River

Caenidae

     Caenis latipennis Banks  (also in Saskatchewan River)

Ephemerellidae    

       Drunella flavilinea (McDunnough)

       Drunella grandis (Eaton)

       Drunella spinifera (Needham)

       Eurylophella lodi Mayo

       Seratella levis (Day)

       Seratella micheneri (Traver)

Ephemeridae

     Ephemera simulans Walker Mary's River, Avery Park, Benton County (also Saskatchewan River)

     Hexagenia limbata (Serville)  Corvallis (also Saskatchewan River)

Heptageniidae

      Leucrocuta jewetti (Allen) Mary's River, Avery Park, Benton County, presumably Willamette River as well.

      Maccaffertium terminatum (Walsh) (also Saskatchewan River)

Isonychiidae

      Isonychia velma Needham

Leptohyphidae

       Asioplax edmundsi (Allen)

       Tricorythodes minutus Traver (also Saskatchewan River)

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(See below for February 2010 samples)

Samples taken in winter , January 2010,  at Albany, Oregon (see above for  photos of the same area in summer) yielded large numbers of specimens, dominated by two or more species of Ephemerella and a species o Heptageniidae,  but also present was a Baetid species, plus a species of Ameletus, which was quite abundant. Trichoptera, Plecoptera, Hemiptera/Corixidae, annelids, and Gammarids were also present.  Details to follow.

************************************************************************************************************************************************

Ameletidae

Note no
movement of
gills in the videos
below
About 20 species of Ameletus are found in Oregon.  A. exquisitus has previously been reported from the Willamette River.  The as yet unidentified species below was abundant at Albany in winter.
The specimen below is freshly preserved in alcohol, and has the most of the original coloration, - colors fade in preserved
specimens. 

See Home for  a photo of the living individual. below.

P1270359.AVI

Ameletus

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Gallery of Mayflies from winter samplesAlbany, Oregon, Willamette River
Baetidae - See list above, id pending
-
The individual left was collected in March
2010 at Albany, Oregon. Comparisons are
being made with the specimens above.
Trichoptera to follow
Ephemerellidae
see known Willamette species in list
above
           

Ephemerella 382 gills and movement.AVI
Video of gill action and general activity of live larvae of Ephemerellidae.
Genus is not Ephmerella- this is the old name (left)
          A golden species with 2 small and 1 wide black band on tails (caudal
filaments)
     The two species pictured 
below are shown here, tail to 
tail                  
                                     
A darkly pigmented species with no black bands
or spots on tails (caudal filaments) (below)
Darkly pigmented species, spots
on tails (below)

-

 Albany, Oregon
Willamette River
January 2010
-
video below
Two species of Plecoptera- Stoneflies
-
Photo below-
upper Heptageniid mayfly
lower- stonefly (Perlodidae)
identifications to follow
  

stonefly448.AVI
Compare the 
Heptageniid
mayfly left
with the
summer species
at the top of
this page.

Identifications
to follow.

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New collections and photos (below) from 14 February  2010:


000This Ameletus species was collected in January 2010.  Note the mid-tail black band and the black tip of the tails, the lack of pigment in the gills, and the distinct dorsal color pattern of the abdomen.  Compare with the individual pictred below, collected Feg. 14, 2010.
oooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo
This is a second species of Ameletus collected at the same site as above (Albany).  Collection date, 14 Feb. 2010.  Note the black mid- band on the antennae, the dark pigment on the tips of all the gills, the broad middle band on the tails, and the color pattern on the dorsal abdomen- clearly a different species compare to the above. 
Middle above- ventral color pattern, directly above- the two species side by side, both collected 14 February 2010

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March 2010, Willamette River, Albany, Oregon: grass is green and growing, trees are showing may new leaves.
Photos above and below, 25 March 2010.

-

Previously uncollected Baetid from the Willamette River,  Albany, Oregon
-In the older keys, this
individual would
be identified as
a "Centroptilum"
species.  The new
classification of
Baetidae is
completely different,
and the identity
of this individual
is unknown at
present.  It is not
one of the four
species of
Baetidae listed
in Meyer and
McCafferty 2007 above.

In this specimen
(photographed alive)
there are 7 pairs of gills,
the first pair being very
small, and there are
no denticles on the
claws, which are short.
Two "Centroptilum"

P3250403.AVI

Above "Centroptilum" collected on 25 March 2010 at
Albany Oregon. Willamette River.
The next day, I attempted to collect more specimens at the same
site, but because of rains the water level had risen about two feet,
and almost nothing was collected, including no more of the above
species.
A week later, water had risen about 10-12 feet, flooding the
rocky shore and all of the grassy area (see below)
the water reaching the trees at left in the photo above.
The previous sampling areas are under more than 10 feet of water because of rains.


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