• Category
  • Length Range
    9-16 µm
  • Width Range
    3-4 µm
  • Striae in 10 µm
    33-35

Identification

Description

Valves are lanceolate with apices subcapitate to produced. The raphe and keel are strongly excentric. There is a large central nodule present. Fibulae are small about 13 in 10 µm. Striae are indistinct, not punctate.

Distribution: Known only from Oregon

Autecology

Original Description

  • Author
    Sovereign 1958

Original Images

Sovereign 1958  Plate  Iv Fonticoloides
Sovereign 1958 P 130 Fonticoloides

Cite This Page

Kociolek, P. (2011). Nitzschia fonticoloides. In Diatoms of North America. Retrieved July 23, 2018, from https://diatoms.org/species/nitzschia_fonticoloides

Responses

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