Ehrenberg 1836 Category: Symmetrical biraphid
BASIONYM: Navicula cari Ehrenberg 1836
SYNONYM(S): Navicula cincta var. cari (Ehrenberg) Cleve 1895
REPORTED AS: Navicula graciloides (Patrick and Reimer 1966, p. 516, plate 49, figs. 9-10)
Contributor: Loren Bahls - July 2012
Length Range: 27-52 µm
Width Range: 6.3-9.0 µm
Striae in 10 µm: 10-13
Valves are lanceolate to linear-lanceolate with obtusely rounded to acutely rounded apices. The axial area is very narrow. The central area is laterally expanded and rounded to nearly rectangular. The raphe is filiform with weakly expanded proximal ends that are deflected slightly in the same direction and widely separated. Striae are curved and strongly radiate near the valve center, becoming straight and parallel to convergent near the apices. Areolae are indistinct and number 32 or more in 10 µm.
Basionym: Navicula cari
Author: Ehrenberg 1836
Length Range: µm
Striae in 10 µm:
Ehrenberg, C.G. (1836). Mittheilungen über fossile Infusionsthiere. Bericht über die zur Bekanntmachung geeigneten Verhandlungen der Königlich-Preussischen Akademie der Wissenschaften zu Berlin 1836:50-54.
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 cari is widely distributed in lakes, but also in creeks and rivers, throughout the Northwest United States. Here it prefers alkaline, nutrient-rich waters with average to higher conductivity and elevated concentrations of sulfate (see table below). It is usually present in low numbers.
Abundance-weighted means of selected water quality variables measured concurrently with the collection of samples containing Navicula cari.
Credit/Source: Montana Diatom Database
Lake Levale, Bob Marshall Wilderness, Montana: home of Navicula cari.
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.