Kociolek and Kingston 1999 Category: Asymmetrical biraphid
BASIONYM: Gomphonema kobayasii Kociolek and Kingston 1999
Contributor: Pat Kociolek - January 2011
Length Range: 10-30 µm
Width Range: 3.5-5.0 µm
Striae in 10 µm: 9-12
Valves are linear-clavate with headpole rounded, footpole narrowly rounded. The striae are parallel to radiate, strongly radiate at the footpole and uniseriate. The axial area is narrow at the poles, widening towards the central area. The central area is broadly rectangular with shortened striae on either side; the central striae are more widely spaced than the others. A stigma is located in the central area. The raphe is straight and lateral, with external proximal raphe ends dilated slightly.
Note that the present concept of this species is based on the variation of the type population. This species is either variable in US material, or there are a number of species within the species complex. Specimens with a more narrow axial area or more elongate valve are reported by analysts. Further studies are necessary to establish species limits for this and closely related species.
Basionym: Gomphonema kobayasii
Author: Kociolek and Kingston 1999
Length Range: µm
Striae in 10 µm:
Kociolek, J.P. and Kingston, J.C. (1999). Taxonomy, ultrastructure, and distribution of some gomphonemoid diatoms (Bacillariophyceae: Gomphonemataceae) from rivers in the United States. Canadian Journal of Botany 77: 686-705. 10.1139/cjb-77-5-686
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.