Eunotia tenella

(Grunow) Hustedt in A. Schmidt et al. 1913      Category: Eunotioid
BASIONYM: Eunotia arcus var.? tenella Grunow in Van Heurck 1881
SYNONYM(S): Eunotia exigua var. tenella  (Grunow) Nörpel et Alles in Alles, Nörpel and Lange-Bertalot 1991 

Eunotia subherkiniensis

 

Eunotia tetraodon
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LM scalebar = 10 µm = 80 pixels.

Observations

Contributor: Paula Furey - March 2012
Length Range: 11-33 µm
Width Range: 2.6-3.7 µm
Striae in 10 µm: 16-22

Description

Ventral margin is slightly concave. Dorsal margin is parallel in longer specimens to more convex in smaller specimens. Apices are broadly rounded to truncate. Helictoglossae are positioned close to the apices. Distal raphe ends curve slightly on to the valve face. Areolae are not visible in the LM. One apical rimoportula is positioned mid-way up valve apex.

Original Description

Basionym: Eunotia arcus var.? tenella
Author: Grunow in Van Heurck 1881
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Furey, P. (2012). Eunotia tenella. In Diatoms of the United States. Retrieved May 23, 2013, from http://westerndiatoms.colorado.edu/taxa/species/eunotia_tenella

Species: Eunotia tenella

Contributor: Paula Furey

Reviewer: Marina Potapova

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Image Credit: Paula Furey

  1. Ventral margin concave
  2. Dorsal margin parallel
  3. Apices broadly rounded to truncate
  4. Helictoglossae close to apices
  5. Distal raphe curves onto valve face

Ventral margin is slightly concave. Dorsal margin is parallel in longer specimens to more convex in smaller specimens. Apices are broadly rounded to truncate. Helictoglossae are positioned close to the apices. Distal raphe ends curve slightly on to the valve face.

Compare

Eunotia tenella valves are broader, the ends are not as distinctly curved, and the striae are not as dense as valve of E. enischna. *Eunotia tenella valve ends are not as strongly dorsally recurved as in E. exigua and E. cataractarum. The dorsal margin of E. tenella is less convex than in E. exigua. The valve size range of E. tenella is shorter and the apices are more broadly rounded compared to E. paludosa.

Eunotia enischna

Eunotia exigua

Eunotia cataractarum

Eunotia paludosa

Citations

Alles, E., Nörpel-Schempp, M. and Lange-Bertalot, H. (1991). Taxonomy and ecology of characteristic Eunotia species in headwaters with low electric conductivity. Nova Hedwigia. 53: 171-213.

Lange-Bertalot, H., Bak, M., Witkowski, A. and Tagliaventi, N. (2011). Eunotia and some related genera. Diatoms of the European Inland Waters and Comparable Habitats. 6: 747 pp.

Schmidt, A. (-). (1874-1959). Atlas der Diatomaceen-Kunde, von Adolf Schmidt, continued by Martin Schmidt, Friedrich Fricke, Heinrich Heiden, Otto Muller, Friedrich Hustedt. Reprint 1984, Koeltz Scientific Books, Konigstein, 480 plates.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Eunotia tenella CAS

North American Diatom Ecological Database (NADED)

NADED ID: 33060

Autecology Discussion

Habits

Size Range

Motility

Attachment

Habitat

Colony

EMAP Assessment

Sampling for 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). Streams and rivers in 12 western states (Arizona, California, Colorado, Idaho, Montana, Nevada, North Dakota, Oregon, South Dakota, Utah, Washington and Wyoming). Over 1200 sites on 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

Eunotia tenella

Distribution

The distribution map represents the relative abundance of this Eunotia tenella 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 Eunotia tenella was not recorded, or with a red circle indicating the relative abundance of Eunotia tenella.

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

Eunotia tenella

Responses

The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Eunotia tenella 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.