Navicula notha

Wallace 1960      Category: Symmetrical biraphid
BASIONYM: Navicula notha Wallace 1960

REPORTED AS: Navicula heimansioides (Krammer and Lange-Bertalot 1991) 

Navicula lundii

 

Navicula nunivakiana
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LM scalebar = 10 µm = 80 pixels.

Observations

Contributor: Marina Potapova - February 2011
Length Range: 18.7-39.3 µm
Width Range: 4.1-5.5 µm
Striae in 10 µm: 14-17

Description

Valves are lanceolate to linear-lanceolate with slightly drawn-out ends. Axial area is narrow, central area is small, rhomboid to elliptical. Proximal raphe ends are noticeably deflected to the primary side. Striae are radiate and bent at valve center, convergent at apices, 14-17 in 10 μm. There are 36-40 lineolae in 10 μm.

Note that this concept of Navicula notha is different from that presented in Krammer & Lange-Bertalot (1991) and Lange-Bertalot (1993, 2001) who distinguished N. notha and N. heimansioides. Most studied populations of N. notha from USA, including the type population from Virginia, had both relatively small specimens that fit Lange-Bertalot's concept of N. notha (length equal or less than 32 μm) and large specimens fitting the concept of N. heimansioides (length equal or greater than 30 μm). A morphometric study across several USA populations failed to reveal any breaks in distribution of size and striae density. SEM examination of large and small specimens from the type material did not show any ultrastructural differences. Therefore, we consider N. heimansioides to be a part of N. notha.

Original Description

Basionym: Navicula notha
Author: Wallace 1960
Length Range: 19-31 µm
Width Range: 4-4.5 µm
Striae in 10 µm: 16-17

Original Description

Valvis angustis lanceolatis 19-31 μ longis, 4-4.5 μ latis, prope apices paullo concavis, apicibus breve productis vel subcapitatis, striis medis radiantibus, terminalibus parallelis vel vix convergentibus, 16-17 in 10 μ.

Original Images

Cite This Page:
Potapova, M. (2011). Navicula notha . In Diatoms of the United States. Retrieved May 25, 2013, from http://westerndiatoms.colorado.edu/taxa/species/navicula_notha

Species: Navicula notha

Contributor: Marina Potapova

Reviewer: Pat Kociolek

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Image Credit: Marina Potapova

  1. Valve lanceolate to linear-lanceolate
  2. Central area small
  3. Proximal raphe ends deflected to primary side
  4. Striae radiate and bent at center
  5. Striae convergent at apices

Valves are lanceolate to linear-lanceolate with slightly drawn-out ends. Valves are 4.1-5.5 μm wide. Axial area is narrow, central area is small, rhomboid to elliptical. Proximal raphe ends are noticeably deflected to the primary side. Striae are radiate and bent at valve center, convergent at apices, 14-17 in 10 μm. There are 36-40 lineolae in 10 μm.

Compare

Navicula cryptocephala differs from N. notha by wider valves and larger round central area. N. leptostriata has very close proximal raphe endings.

Navicula cryptocephala

Navicula leptostriata

Citations

Krammer, K. and Lange-Bertalot, H. (1991). Bacillariophyceae. 3. Teil: Centrales, Fragilariaceae, Eunotiaceae. . In Ettl, H., Gerloff, J., Heynig, H. & Mollenhauer, D. (Eds.). Süsswasserflora von Mitteleuropa. 2(3): 1-576. Gustav Fisher Verlag, Stuttgart, Germany.

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.

Wallace, J. (1960). New and variable diatoms. Notulae Naturae 331: 1-8.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Navicula notha CAS

North American Diatom Ecological Database (NADED)

NADED ID: 46044

Autecology Discussion

Characteristic for soft waters of low nutrient content.

Habits

Size Range

101-1000 µm3 (ie Amphora veneta)

Motility

moderately motile (e.g. Navicula tripunctata)

Attachment

unattached

Habitat

benthic

Colony

solitary

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

Navicula notha

Distribution

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

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 notha

Responses

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