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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


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


  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


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
reported from the Willamette
River below. Identification
 of specimen below pending)
videoHeptageniidae ventral-labrum

Also Tricorythodes above.

P7230084 Hept group albany ore.AVI


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

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


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

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


       Ameletus exquisitus Eaton


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


      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


     Caenis latipennis Banks  (also in Saskatchewan River)


       Drunella flavilinea (McDunnough)

       Drunella grandis (Eaton)

       Drunella spinifera (Needham)

       Eurylophella lodi Mayo

       Seratella levis (Day)

       Seratella micheneri (Traver)


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

     Hexagenia limbata (Serville)  Corvallis (also Saskatchewan River)


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

      Maccaffertium terminatum (Walsh) (also Saskatchewan River)


      Isonychia velma Needham


       Asioplax edmundsi (Allen)

       Tricorythodes minutus Traver (also Saskatchewan River)


(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.



Note no
movement of
gills in the videos
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

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




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
see known Willamette species in list

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
     The two species pictured 
below are shown here, tail to 
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

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

to follow.


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.
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


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"


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
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.