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Revisit to the study site of   "Lehmkuhl D.M. 1973. Adaptations to a marine climate illustrated by Ephemeroptera. // In: Peters W.L. & Peters J.G. (eds). Proceedings of the 1st international conference on Ephemeroptera. E.J. Brill, Leiden: 33-38, 1 pl. "

Below, This Leptophlebia pacifica was collected 21 Feb. 2010.  The location is the exact site mentioned in the publication above, available in the pdf below.  The site is about 6 miles south of Corvallis and 3 1/2 miles west of Hwy. 99 W..  The life cycle of L. pacifica is discussed in the pdf below, and the collections made in 2010 were taken to see if the species was still present in the area.  The habitat has changed somewhat since the late 1960's, but the species is still present.  At the time of publication of the paper below, the species seemed to be resricted to Benton County, Oregon, but Meyer and McCafferty (Mayflies of Oregon) have extended the range of the species to a number of nearby counties. 


Leptophlebia gills and movement 250.AVI


marine climate.pdf


Sample site, Feb. 20, 2010.  Compare with Plate I C in the pdf above
Samples were taken from the water in the ditches on both sides of the road. A thin layer of ice had formed overnight but daytime temperatures were about 10 C.
It is known that in some species of Leptophlebia, larvae hatch in flowing water, then migrate in huge numbers into
nearby connected flooded areas.  Notice the stream above and the water in the roadside ditch where
the larvae were collected.  It may be that the Willamette Valley species also does this, but this has not been investigated.
Net and sample pan, with submerged vegetation in roadside ditch that is the habitat of L. pacifica

See Oregon Rivers for related discussions.