(Ehrenberg) Ralfs in Pritchard 1861 Category: Symmetrical biraphid
BASIONYM: Pinnularia cincta Ehrenberg 1854
Contributor: Loren Bahls - July 2012
Length Range: 17-27 µm
Width Range: 4.0-5.6 µm
Striae in 10 µm: 9-10 in center valve, 11-13 at the apices
Valves are linear-lanceolate to elliptic-lanceolate with obtusely rounded, never protracted apices. The axial area is narrow and widens gradually into the central area, which is small and irregular in shape due to the variable length of the central striae. The raphe is filiform and straight with proximal ends that are slightly inflated and relatively close together. Striae are radiate and more widely spaced at valve center, abruptly becoming parallel and then convergent near the apices. Areolae in the striae are very fine and difficult to resolve in LM.
Basionym: Pinnularia cincta
Author: Ehrenberg 1854
Length Range: µm
Striae in 10 µm:
Carter, J.R. (1979). On the identity of Navicula cincta Ehrenberg. Bacillaria 2, J. Cramer, Braunschweig, pp. 73-84.
Ehrenberg, C.G. (1854). Mikrogeologie. Einundvierzig Tafeln mit über viertausend grossentheils colorirten Figuren, Gezeichnet vom Verfasser. Voss, Leipzig., Pl. 5, II, fig. 23 (iconotype).
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.
Lange-Bertalot, H. (2001). Navicula sensu stricto, 10 genera separated from Navicula sensu lato, Frustulia. Diatoms of Europe 2: 1-526.
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.
Navicula cincta is widespread and locally abundant in streams with moderate to high levels of conductivity. These waters tend to have elevated concentrations of chloride, sodium, and sulfate (see table below). Common diatom associates of N. cincta (see table below) share an affinity for brackish and nutrient-rich inland waters.
Abundance-weighted means for selected water quality variables measured concurrently with the collection of samples containing Navicula cincta.
Credit/Source: Montana Diatom Database
Percent co-occurrence of the most frequent diatom associates of Navicula cincta.
Credit/Source: Montana Diatom Database
Charlie Creek, Richland County, Montana: home of Navicula cincta.
Credit/Source: Loren Bahls
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.