Navicula seibigiana

Lange-Bert. 1993      Category: Symmetrical biraphid

REPORTED AS: Navicula species 3 (Krammer and Lange-Bertalot 1986, Fig. 38: 21) | Navicula seibigii (Krammer and Lange-Bertalot 1991 & 2004, Fig. 63: 1-6) 

Navicula schweigeri

 

Navicula slesvicensis
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LM scalebar = 10 µm = 80 pixels.

Observations

Contributor: Loren Bahls - April 2012
Length Range: 26-29 µm
Width Range: 5.2-5.8 µm
Striae in 10 µm: 11-12

Description

Valves are lanceolate with slightly protracted, broadly rounded apices. The axial area is narrow and linear. The central area is small and bordered on each side by one or two short striae. The raphe is filiform with inflated proximal ends. Striae are robust, strongly radiate in the middle, becoming abruptly parallel then convergent near the ends. Areolae are fine and number 34-38 in 10 µm.

Original Description

Basionym:
Author: Lange-Bert. 1993
Length Range: 25-35 µm
Width Range: 5.5-6.5 µm
Striae in 10 µm: 9-11

Original Description

Valves elliptic-lanceolate to linear-lanceolate, ends often slightly protracted for a short distance, very obtusely to almost broadly rounded, length 25-35 µm, breadth 5.5-6.5 µm. Raphe branches filiform with very distinct central pores. Axial area narrow, linear, central area irregularly bordered on both sides due to the shortening of one or two striae, almost rectangular, only slightly enlarged. Striae fairly strongly radiate in the middle, then abruptly parallel, becoming convergent, 9-11/10 µm; lineolae c. 36/10 µm.

Original Images

Cite This Page:
Bahls, L. (2012). Navicula seibigiana. In Diatoms of the United States. Retrieved April 23, 2018, from http://westerndiatoms.colorado.edu/taxa/species/navicula_seibigiana

Species: Navicula seibigiana

Contributor: Loren Bahls

Reviewer: Sarah Spaulding

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Image Credit: Sarah Spaulding

  1. Striae radiate in center
  2. Striae convergent near apices
  3. Striae robust
  4. Central striae shortened

Valves are 5-6 µm wide with robust striae that number 11-12 in 10 µm. Striae are radiate in the middle, becoming abruptly convergent near the apices. The central 1 or 2 striae are shortened.

Compare

Navicula tenelloides has narrower valves and a higher stria density. Navicula libonensis has a larger central area and higher stria density.

Navicula libonensis

Navicula tenelloides

Hust. 1937

Citations

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.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Navicula seibigiana CAS

North American Diatom Ecological Database (NADED)

NADED ID: 46870

Autecology Discussion

Navicula seibigiana has been recorded from 55 ponds and small streams in the Pacific Northwest, where it is present in small numbers. In these waters mean water temperature is 9.3 degrees C, mean pH is 7.6, and mean specific conductance is 120 µS/cm.

Images

Blakiston Beaver Pond A, Waterton Lakes National Park, Alberta: home of Navicula seibigiana.

Credit/Source: Barb Johnston, Parks Canada.

Habits

Size Range

101-1000 µm3 (ie Amphora veneta)

Motility

moderately motile (e.g. Navicula tripunctata)

Attachment

unattached

Habitat

benthic

Colony

solitary

EMAP Assessment

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.

EMAP Distribution

Navicula seibigiana

Distribution

The distribution map represents the relative abundance of this Navicula seibigiana in the western EMAP study. Relative abundance is a measure of the proportion of cells of this species based on a "fixed count" of 300 total diatom cells counted and identified. Each of the western EMAP sample sites is shown, either with a black dot for sites where Navicula seibigiana was not recorded, or with a red circle indicating the relative abundance of Navicula seibigiana.

Note that the size of the proportional symbols varies between species to help show both abundant and rare species.

Scale for the map to the left

EMAP Response Plots

Navicula seibigiana

Responses

The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Navicula seibigiana from all the stream reaches where it was present. Note that the relative abundance scale is the same on each plot. Explanation of each environmental variable and units are as follows:

ELEVATION = stream reach elevation (meters)
STRAHLER = distribution plot of the Strahler Stream Order
SLOPE = stream reach gradient (degrees)
W1_HALL = an index that is a measure of streamside (riparian) human activity that ranges from 0 - 10, with a value of 0 indicating of minimal disturbance to a value of 10 indicating severe disturbance.
PHSTVL = pH measured in a sealed syringe sample (pH units)
log_COND = log concentration of specific conductivity (µS/cm)
log_PTL = log concentration of total phosphorus (µg/L)
log_NO3 = log concentration of nitrate (µeq/L)
log_DOC = log concentration of dissolved organic carbon (mg/L)
log_SIO2 = log concentration of silicon (mg/L)
log_NA = log concentration of sodium (µeq/L)
log_HCO3 = log concentration of the bicarbonate ion (µeq/L)
EMBED = percent of the stream substrate that is embedded by sand and fine sediment
log_TURBIDITY = log of turbidity, a measure of cloudiness of water, in nephelometric turbidity units (NTU).
DISTOT = an index of total human disturbance in the watershed that ranges from 1 - 100, with a value of 0 indicating of minimal disturbance to a value of 100 indicating severe disturbance.

EMAP citations

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.