• Category
  • Length Range
    8-20 µm
  • Width Range
    3-4 µm
  • Striae in 10 µm
    22-27

Identification

Description

Valves are linear to linear-lanceolate, with parallel margins. The distal valve tapers abruptly to form slightly protracted to rounded apices. Fibulae are distinct, numbering 11-13 in 10 µm. Striae are parallel and finely punctate.

Autecology

Original Description

  • Basionym
    Nitzschia frustulum var. perminuta
  • Author
    Grunow in Van Heurck 1881

EMAP Assessment

EMAP Distribution

Nitzschia Perminuta   Grunow   Peragallo 10
Map 10

Response Plots

Nitzschia Perminuta   Grunow   Peragallo

Cite This Page

Kociolek, P. (2011). Nitzschia perminuta . In Diatoms of North America. Retrieved July 21, 2018, from https://diatoms.org/species/nitzschia_perminuta

Responses

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