Navicula tripunctata

(O.F. Müller) Bory 1822      Category: Symmetrical biraphid
BASIONYM: Vibrio tripunctatus O.F. Müller 1786

Navicula trilatera

 

Navicula trivialis
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LM scalebar = 10 µm = 40 pixels.

Observations

Contributor: Marina Potapova - May 2009
Length Range: 32-60 µm
Width Range: 6–10 µm
Striae in 10 µm: 9–12

Description

Valves are linear-lanceolate with wedge-shaped ends, 6-10 µm wide, 32-60 µm long. The raphe is straight. The axial area is narrow, linear, with the central area transversely rectangular or elliptical. The striae are almost parallel throughout the valve, weakly radiate in the middle and slightly convergent at the apices, 9-12 in 10 µm. Areolae 30-33 in 10 µm.

Original Description

Basionym: Vibrio tripunctatus
Author: O.F. Müller 1786
Length Range: µm
Striae in 10 µm:

Original Description

Vibrio linearis, utrique attenuatus, globulis tribus, extremis minoribus.

Original Images

Cite This Page:
Potapova, M. (2009). Navicula tripunctata. In Diatoms of the United States. Retrieved June 19, 2013, from http://westerndiatoms.colorado.edu/taxa/species/Navicula_tripunctata

Species: Navicula tripunctata

Contributor: Marina Potapova

Reviewer: Sam Rushforth

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Image Credit: Marina Potapova

  1. Valves linear-lanceolate with wedge-shaped ends
  2. Central area symmetrical, transversely rectangular or elliptical
  3. Striae nearly parallel

Valves linear-lanceolate with wedge-shaped ends. Central area variable in shape, symmetrical, transversely rectangular or elliptical. Striae parallel, or nearly parallel throughout the valve except near the central area and poles.

Compare

Navicula margalithii is most similar to N. tripunctata. N. margalithii, however, possesses a strongly asymmetrical central nodule, a small central area and the lineolate areolae are longer. Navicula recens has shorter and more lanceolate valves and strongly radiate striae. N. geronimensis has asymmetrical central area and central raphe endings sharply bent to the primary side of the valve.

Navicula recens

Navicula geronimensis

Navicula margalithii

Lange-Bertalot

Citations

Bory de Saint-Vincent, J.B.M. (1822). Dictionnaire Classique d’Histoire Naturelle. Paris. Rey & Gravier, libraires-éditeurs; Baudouin Frères, libraires-éditeurs. vol. 1.

Müller, O.F. (1786). Diatomaceen (Vibrio paxillifer, V. bipunctatus, V. tripunctatus, Gonium pulvinatum). Animalcula infusoria fluviatilia et marina quae detexit, systematice, descripsit et ad vivum delineare curavit O.F. Muller. Havniae, 1786., LVI + 367 pp., 50 pls.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Navicula tripunctata CAS

NCBI Genbank Taxonomy

Navicula tripunctata NCBI

North American Diatom Ecological Database (NADED)

NADED ID: 46104

Autecology Discussion

Eutraphentic species

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

Navicula tripunctata

Distribution

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

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 tripunctata

Responses

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