Navicula viridula | Species - Diatoms of North America

Category

Symmetric Biraphid
Length Range

50-70 µm
Width Range

11.2-13.5 µm
Striae in 10 µm

8-9

Contributor

Marina Potapova - Nov 2011
Reviewer

Rex Lowe - Nov 2011

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Identification

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Description

Valves are lanceolate to linear-lanceolate with subrostrate apices. The axial area is narrow and straight. The central area is asymmetric; it is trapezoid on the primary side, and semi-circular on the secondary side. The raphe is straight, with external proximal raphe ends slightly dilated and bent toward the 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. Areolae are usually visible under LM and number 24-25 in 10 μm.

Autecology

This taxon is most abundant in low gradient streams and rivers, where fine sediments are prevalent. It is tolerant of high pH, conductance, and alkalinity. It is found across a range of nitrogen concentrations and high phosphorus.

Size Range, µm3

1001-10000
Motility

Moderately motile
Attachment

Unattached
Habitat

Benthic
Colony

Solitary
Occurrence

Rare
BCG

BCG 5
Waterbody

Inland Rivers Lakes
Distribution

Western rivers 2004 California coastal rivers 2017 Northeast lake sediments Great Lakes inventory
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Original Description

FRUSTULIA VIRIDULA. Ktz. (Fig. 12.) Frustulis minutissimis viridi-lutescentibus, lanceolatis, altero latere truncates, altero acutiusculis, aut opacis aut apicibus hyalines, in strato mucoso nidulantibus. Ich fand sie in einem Teiche bei Markwerben unweit Weissenfels an Hypnum fluitans, so wie auch unter Oscillatorien, mit der folgenden vermischt. Sie bewegte sich.

Basionym

Frustulia viridula
Author

Kütz. 1833

Original Images

Citations & Links

Citations

Cite This Page

Potapova, M. (2011). Navicula viridula. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/47098/navicula_viridula

Responses

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