Diatoms of North AmericaDiatoms of North America

Navicula veneta

Kütz. 1844

Navicula Veneta Guide
  • Category
    Symmetric Biraphid
  • Length Range
    17-26 µm
  • Width Range
    4.4-5.3 µm
  • Striae in 10 µm
    14-15 in the center valve
  • Synonyms
    Navicula cryptocephala var. veneta (Kütz.) Rabenh.

Identification

Gc112144 Nrsa0167 Naven4 Gc112144 Nrsa0167 Naven7 Gc112144 Nrsa0167 Naven1 Gc112144 Nrsa0167 Naven5 Gc112144 Nrsa0167 Naven6 Gc112144 Nrsa0167 Naven3 Gc112144 Nrsa0167 Naven2
View image metadata
Navicula veneta SEM2 Navicula veneta SEM1

Description

Valves are lanceolate to linear-lanceolate with moderately protracted apices. The axial area is narrow and straight. The central area is transversely rectangular or ellipticl. The raphe is straight, with drop-like external proximal ends. Striae are slightly radiate around the center, becoming convergent at the apices. The areolae are sometimes visible under LM, approximately 35 in 10 μm.

Autecology

This taxon is found in low gradient rivers and is tolerant of high pH, conductance, nitrogen and phosphorus concentrations, and alkalinity. It is able to live in rivers with high sediment loads, turbidity and measures of high human disturbance. Indeed, it is considered a pollution-tolerant species.

Original Description

N. minutula, lanceolata, latiuscula, laevissima, apicibus productis obtusiusculus. Long. 1/115’’’.

  • Author
    Kütz. 1844
  • Length Range
    19.6 µm

Original Images

Naveneta Or Ill
Na Veneta Or Descr

Cite This Page

Potapova, M. (2011). Navicula veneta. In Diatoms of North America. Retrieved November 21, 2024, from https://diatoms.org/species/navicula_veneta

Responses

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