Lange-Bertalot 1993 Category: Symmetrical biraphid
BASIONYM: Navicula wildii Lange-Bertalot 1993
REPORTED AS: Navicula species 1 (Krammer and Lange-Bertalot 1986)
Contributor: Loren Bahls - March 2012
Length Range: 29-49 µm
Width Range: 6.3-7.8 µm
Striae in 10 µm: 12-14
Valves are narrowly lanceolate with gradually attenuated, obtusely rounded apices. The raphe is filiform. Proximal raphe ends are bent to the secondary side. Distal raphe fissures are also bent to the secondary side. The axial area is narrow and merges into a small, lanceolate to rhombic central area formed by irregularly shortened striae. Striae are radiate, becoming parallel and then convergent at the apices. Areolae are indistinct and number 30–36 in 10 μm.
Basionym: Navicula wildii
Author: Lange-Bertalot 1993
Length Range: 23-50 µm
Width Range: 5.5-7.5 µm
Striae in 10 µm: 11-12.5
Valves (narrow) lanceolate, gradually narrowing to obtusely rounded ends, very rarely almost imperceptibly protracted, length 23-50 μm, breadth 5.5-7.5 μm. Raphe usually filiform, central pores distinct (when correctly focused), appearing a little hook-shaped. Axial area narrow, linear, widened to a small, irregularly bordered, usually lanceolate to rhombic central area. Striae strongly radiate, abruptly parallel and finally convergent at the ends, 11-12.5/10 μm. Lineolae difficult to separate (in LM), 30-33(35?) in 10 μm.
Bahls, L.L. (2012). Seven new species in Navicula sensu stricto from the Northern Great Plains and Northern Rocky Mountains. Nova Hedwigia, Beiheft 141: 19–38.
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.
Krammer, K. and Lange-Bertalot, H. (2004). Bacillariophyceae 4. Teil: Achnanthaceae, Kritische Erganzungen zu Navicula (Lineolatae), Gomphonema Gesamtliteraturverzeichnis Teil 1-4 [second revised edition]. In: H. Ettl et al., Suesswasserflora von Mitteleuropa. Spektrum Akademischer Verlad Heidelberg, 468 pp.
Lange-Bertalot, H. (1993). 85 Neue taxa und uber 100 weitere neu definierte Taxa erganzend zur Subwasserflora von Mittleuropa. Bibliotheca Diatomologica 27, 454 p. Cramer, Berlin, Stuttgart.
Lange-Bertalot, H. (2001). Navicula sensu stricto, 10 genera separated from Navicula sensu lato, Frustulia. Diatoms of Europe 2: 1-526.
Navicula wildii is widely distributed in lakes and streams in western Montana and southern Alberta, where it is present in low numbers. In these waters it prefers neutral to moderately alkaline pH and low to moderate levels of electrolytes (see table below).
Governor Pond and Grinnell Point, Swiftcurrent Valley, Glacier National Park, Montana. Governor Pond is home to Navicula wildii.
Credit/Source: Loren Bahls
Abundance-weighted means of selected water quality variables measured concurrently with the collection of samples containing Navicula wildii.
Credit/Source: Montana Diatom Database
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.