Diatoms of North AmericaDiatoms of North America

Navicula cincta

(Ehrenb.) Ralfs in A.Pritch. 1861

Navicula Cinta Guide
  • Category
    Symmetric Biraphid
  • Length Range
    17-27 µm
  • Width Range
    4.0-5.6 µm
  • Striae in 10 µm
    9-10 in center valve, 11-13 at the apices

Identification

Navicula cincta LM7 Navicula cincta LM6 Navicula cincta LM5 Navicula cincta LM4 Navicula cincta LM3 Navicula cincta LM2 Navicula cincta LM1
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Description

Valves are linear-lanceolate to elliptic-lanceolate with obtusely rounded, never protracted apices. The axial area is narrow and widens gradually into the central area, which is small and irregular in shape due to the variable length of the central striae. The raphe is filiform and straight with proximal ends that are slightly inflated and relatively close together. Striae are radiate and more widely spaced at valve center, abruptly becoming parallel and then convergent near the apices. Areolae in the striae are very fine and difficult to resolve in LM.

Autecology

Navicula cincta is widespread and locally abundant in streams with moderate to high levels of conductivity. These waters tend to have elevated concentrations of chloride, sodium, and sulfate (see table below). Common diatom associates of N. cincta (see table below) share an affinity for brackish and nutrient-rich inland waters.

Navcincta Chem
Credit: Montana Diatom Database
Abundance-weighted means for selected water quality variables measured concurrently with the collection of samples containing Navicula cincta.
Navcincta Associates
Credit: Montana Diatom Database
Percent co-occurrence of the most frequent diatom associates of Navicula cincta.
Charlie Creek 2
Credit: Loren Bahls
Charlie Creek, Richland County, Montana: home of Navicula cincta.

Original Description

  • Basionym
    Pinnularia cincta
  • Author
    Ehrenb. 1854

Cite This Page

Bahls, L. (2012). Navicula cincta. In Diatoms of North America. Retrieved November 21, 2024, from https://diatoms.org/species/navicula_cincta

Responses

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