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 Center for Algal Microscopy
Procter and Gamble Environmental Stream Facility


    This directory contains 67 digitized diatom images representing 66 taxa from the Procter and Gamble Experimental Stream Facility near Cincinnati, OH. See Belanger et al in Aquatic Mesocosm Studies in Ecological Risk Assessment, Ward, C.H., B.T. Walton, and T.W. La Point, Lewis Publishers for a detailed description of the facility. Water for the artificial streams comes from the Lower East Branch of the Little Miami River in Clermont County. This 5th order tributary of the Little Miami has been designated as an Exceptional Warmwater Habitat by the Ohio EPA. Most of the water shed (1297 km2) consists of heavily wooded slopes and zones of riparian vegetation. There are seven populations centers and one dam along its 132 km course. The designed low flow from the dam is 30 CFS. The ESF has the ability to supply its artificial stream channels with a mixture of stream water, waste water effluent, and product chemicals. These manipulations serve as multispecies bioassay experiments before commercial introduction of consumer products. These digitized images are from diatoms collected from tile and cobble substrates through the course of a bioassay testing the effects of lauryl trimethyl ammonium chloride, a proposed detergent surfactant (see Belanger et al 1993).

We'd like to thank Scott Belanger and The Procter and Gamble Company for permission to make these images available.

    You can learn more about the facility here.

Taxa in this archive

Karayevia clevei Planothidium lanceolatum
Amphora ovalis v. pediculus Amphora perpusilla
Amphora submontana Aulacosira granulata
Bacillaria paxillifer Cocconeis pediculus
Cocconeis placentula Cyclotella atomus
Cyclotella meneghiniana Cyclotella stelligera
Cymatopleura solea Cymbella tumida
Cymbella turgidula Diatoma vulgare
vDiploneis puella Staurosirella pinnata
Gomphonema brasiliensis Gomphonema gracile
Gomphonema vibrio v. intricatum Gomphonema parvulum
Gyrosigma accuminatum Gyrosigma accuminatum
Gyrosigma obtusatum Melosira varians
Craticula accomoda Hipodonta capitata
Navicula cryptocephala Navicula cryptocephala v. veneta
Placoneis elginensis Navicula gastrula
Navicula gregaria Geissleria thingvallae
Navicula luzonensis Navicula menisculus
Navicula radiosa v. tenella Navicula capitatoradiata
Navicula seminulum Navicula symmetrica
Navicula tenera Navicula tripunctata
Navicula tripuncta v. schizonemoides Navicula viridula
Navicula viridula v. rostellata Nitzschia amphibia
Tryblionella calida Nitzschia compressa v. vexans
Nitzschia dissipata Nitzschia frustulum
Tryblionella hungarica Nitzschia inconspicua
Nitzschia lanceolata v. minutula Nitzschia levidensis
Nitzschia palea Nitzschia recta
Nitzschia tubicola Pinnularia hilseana
Pleurosira laevis Pleurosira laevis
Reimeria sinuata Sellaphora pupula
Stephanodiscus invisitatus Surirella linearis v. helvetica
Surirella ovata  


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