(Kützing) Rabenhorst 1864 Category: Symmetrical biraphid
BASIONYM: Navicula brebissonii Kützing 1844
REPORTED AS: Pinnularia microstauron var. brebissonii (Krammer and Lange-Bertalot 1986, p. 426, fig. 191: 7-9)
Contributor: Loren Bahls - March 2014
Length Range: 20-57 µm
Width Range: 7.3-10.9 µm
Striae in 10 µm: 10-13
Valves are fusiform to nearly elliptic , with parallel margins in larger specimens. The apices are broadly apiculate. The axial area is narrow near the apices, becoming wider toward the central area. The central area is a broad, rhombic fascia. The raphe is weakly lateral and straight. Proximal raphe ends are distinctly inflated and laterally deflected. Terminal raphe fissures are deflected to the primary valve side and are shaped like question marks. Striae are strongly radiate near the central area, becoming parallel, then convergent near the apices.
Pinnularia brebissonii is part of a large species complex, including a number of varieties (Krammer 2000). The specimens here conform to the nominate variety.
Basionym: Navicula brebissonii
Author: Kützing 1844
Length Range: µm
Striae in 10 µm:
Krammer, K. (1992). Die Gattung Pinnularia in Bayern. Hoppea 52: 1-308.
Krammer, K. (2000). The genus Pinnularia. The Diatoms of Europe. Diatoms of Inland Waters and Comparable Habitats 1: 1-703.
Krammer, K. and Lange-Bertalot, H. (1986). Bacillariophyceae. 1. Teil: Naviculaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Süsswasserflora von Mitteleuropa, Band 2/1. Gustav Fisher Verlag, Jena. 876 pp.
Kützing, F.T. (1844). Die kieselschaligen Bacillarien oder Diatomeen. Nordhausen. 152 pp., 30 pls.
Patrick, R.M. and Reimer, C.W. (1966). The Diatoms of the United States exclusive of Alaska and Hawaii, V. 1. Monographs of the Academy of Natural Sciences of Philadelphia 13.
Rabenhorst, L.G. (1864). Flora Europaea Algarum aquae dulcis et submarinae. Sectio I. Algas diatomaceas complectens, cum figuris generum omnium xylographice impressis. Eduardum Kummerum, Lipsiae 359 pp.
The cosmopolitan species Pinnularia brebissonii comprises a large infraspecific complex of varieties, each with rather narrow autecological preferences (Krammer 2000). Specimens of P. brebissonii pictured here are from a shallow alkaline lake in Glacier National Park (photo below) and a cattail marsh adjacent to Interstate 90 in Butte, Montana. The lake, Hidden Meadow Lake, had a pH of 7.82 and a specific conductance of 332 µS/cm.
Hidden Meadow Lake, Glacier National Park, Montana: home of Pinnularia brebissonii.
The Environmental Protection Agency (EPA) western Environmental Monitoring and Assessment Program (EMAP) study was completed during the years 2000-2004 (see citations at bottom of this page). Over 1200 streams and rivers in 12 western states (Arizona, California, Colorado, Idaho, Montana, Nevada, North Dakota, Oregon, South Dakota, Utah, Washington and Wyoming) were selected for sampling based on a stratified randomized design. This type of design insures that ecological resources are sampled in proportion to their actual geographical presence. Stratified randomized design also allows for estimates of stream length with a known confidence in several “condition classes” (good or least-disturbed, intermediately-disturbed, and poor or most-disturbed) for biotic condition, chemistry and habitat.
Results are published in:
Johnson, T., Hermann, K., Spaulding, S., Beyea, B., Theel, C., Sada, R., Bollman, W., Bowman, J., Larsen, A., Vining, K., Ostermiller, J., Petersen, D. Hargett, E. and Zumberge, J. (2009). An ecological assessment of USEPA Region 8 streams and rivers. U.S. Environmental Protection Agency Region 8 Report, 178 p.
Stoddard, J. L., Peck, D. V., Olsen, A. R., Larsen, D. P., Van Sickle, J., Hawkins, C. P., Hughes, R. M., Whittier, T. R., Lomnicky, G. A., Herlihy, A. T., Kaufman, P. R., Peterson, S. A., Ringold, P. L., Paulsen, S. G., and Blair, R. (2005). Environmental Monitoring and Assessment Program (EMAP) western streams and rivers statistical summary. U.S. Environmental Protection Agency Report 620/R-05/006, 1,762 p.
Stoddard, J. L., Peck, D. V., Paulsen, S. G., Van Sickle, J., Hawkins, C. P., Herlihy, A. T., Hughes, R. M., Kaufman, P. R., Larsen, D. P., Lomnicky, G. A., Olsen, A. R., Peterson, S. A., Ringold, P. L., and Whittier, T. R. (2005). An ecological assessment of western streams and rivers. U.S. Environmental Protection Agency Report 620/R-05/005, 49 p.