(Kützing) Rabenhorst 1860 Category: Nitzschioid
BASIONYM: Synedra dissipata Kützing 1844
Contributor: Kalina Manoylov - June 2010
Length Range: 12-72 µm
Width Range: 2.9-8 µm
Striae in 10 µm: 32-50
Valves linear to lanceolate, with rostrate ends slightly to strongly protracted. Length is 11-72 µm, width 3-8 µm. The canal raphe is prominent and slightly eccentric, or may be positioned central axis of the valve. Fibulae are distinct and parallel to the transapical axis. Interspaces of the fibulae are rectangular to square, 5-12 in 10 µm. A conopeum is present and recognizable under LM as two parallel lines on either side of the raphe. Transapical striae are not discernable or only faintly visible under the light microscope. Viewed with SEM, striae number 32-50 in 10 µm. Each stria is composed of a single row of small round to oval areolae (40-70 in 10 µm). The terminal raphe fissure is hooked and sometimes projects widened or bifurcate in LM.
Basionym: Synedra dissipata
Author: Kützing 1844
Length Range: µm
Striae in 10 µm:
Rabenhorst, L. (1860). Die Algen Sachsens resp. Mittel-Europa’s. Decas 95-96. no. 943-953 etc. .
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.