Navicula viridulacalcis subsp. neomundana

Lange-Bertalot and Rumrich in Rumrich, Lange-Bertalot and Rumrich 2000      Category: Symmetrical biraphid
BASIONYM: Navicula viridulacalcis subsp. neomundana Rumrich and Lange-Bertalot in Rumrich, Lange-Bertalot and Rumrich 2000

REPORTED AS: Navicula viridula var. linearis Hustedt (Patrick and Reimer 1966) 

Navicula viridula

 

Navicula vulpina
Show images Hide

LM scalebar = 10 µm = 40 pixels.

Observations

Contributor: Marina Potapova - May 2011
Length Range: 45-68 µm
Width Range: 10.0-12.2 µm
Striae in 10 µm: 8-9

Description

Valves linear with wedge-shaped apices. The axial area is narrow and straight. The central area is asymmetric, trapezoid on primary side, semi-circular on secondary side. The raphe is straight, with external proximal raphe ends slightly dilated and bent towards primary side of the valve. The central nodule is asymmetrically expanded on the internal valve surface to the primary side. Striae are radiate in the valve center, becoming convergent at the apices. The areolae are visible under LM, 22-26 in 10 μm.

Original Description

Basionym: Navicula viridulacalcis subsp. neomundana
Author: Rumrich and Lange-Bertalot in Rumrich, Lange-Bertalot and Rumrich 2000
Length Range: µm
Striae in 10 µm:

Original Description

Valves usually somewhat broader and more abruptly cuneate towards the ends (than the nominate variety)

Original Images

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

Species: Navicula viridulacalcis

Contributor: Marina Potapova

Reviewer: Rex Lowe

Show guide Hide

Image Credit: Marina Potapova

  1. Valves linear
  2. Apices wedge-shaped
  3. Valves 10-12.2 μm wide
  4. Central nodule asymmmetric
  5. External proximal raphe ends bent towards primary side

Valves are linear with wedge-shaped apices. The central area is asymmetric, trapezoid on primary side, semi-circular on secondary side. External proximal raphe ends are bent towards primary side of the valve. The central nodule is asymmetrically expanded to the primary side. Areolae are visible under LM, 22-26 in 10 μm.

Compare

Navicula viridulacalcis subsp. neomundana differs from N. viridula by the linear valves with distinctly wedge-shaped apices. N. slesvicensis has a symmetrical central nodule, straight proximal raphe ends, and lanceolate valve shape. N. rostellata is smaller and has higher striae density. The nominate variety N. viridulacalcis subsp. viridulacalcis has more narrow valves with less abruptly cuneate apices, but its occurrence in North America has not been confirmed.

Navicula rostellata

Navicula viridula

Navicula slesvicensis

Navicula viridulacalcis subsp. viridulacalcis

Lange-Bertalot in Rumrich et al.

Citations

Lange-Bertalot, H. (2001). Navicula sensu stricto, 10 genera separated from Navicula sensu lato, Frustulia. Diatoms of Europe 2: 1-526.

Rumrich, U., Lange-Bertalot, H. and Rumrich, M. (2000). Diatoms of the Andes. From Venezuela to Patagonia/Tierra del Fuego and two additional contributions. Lange-Bertalot, H. (ed.), Iconographia Diatomologica. Annotated Diatom Micrographs. Vol. 9. Phytogeography-Diversity-Taxonomy. Koeltz Scientific Books, Königstein, Germany, 9:673 pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Navicula viridulacalcis subsp. neomundana CAS

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion

Habits

Size Range

1001-10,000 µm3 (ie Diatoma vulgaris)

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 viridulacalcis subsp. neomundana

Distribution

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

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 viridulacalcis subsp. neomundana

Responses

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