Diatoms of North AmericaDiatoms of North America

Navicula elsoniana

R.M.Patrick and Freese 1961

Navicula Elsoniana Guide
  • Category
    Symmetric Biraphid
  • Length Range
    29.5–38.5 µm
  • Width Range
    11–11.5 µm
  • Striae in 10 µm
    11

Identification

Navicula elsoniana LM1 Navicula elsoniana LM5 Navicula elsoniana LM6 Navicula elsoniana LM4 Navicula elsoniana LM3 Navicula elsoniana LM2
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Description

Valves are widely lanceolate with protracted rounded apices. Striae are radiate at the center and convergent at the apices. The central area is large and asymmetric. The axial area is narrow, straight and slightly elevated. The raphe is filiform and linear. The proximal raphe ends are linearly expanded as a pore.The distal fissures are weakly hooked. Areolae are lineate. In LM, a thickened central nodule is not evident.

Autecology

Original Description

Valves broadly lanceolate with protracted, narrow, rounded ends. Axial area narrow and together with the central nodule, distinct from the central area. Central area large, orbicular, formed by the slightly irregular shortening of the striae around the central area. Striae distinctly lineate, radiate throughout most of the valve. Striae at the ends of the valve convergent. Striae 10–11 in 10 µm. Length, 39–43 µm. Breadth, 10–12 µm

  • Author
    R.M.Patrick and Freese 1961
  • Length Range
    39–43 µm
  • Width
    10–12 µm
  • Striae in 10µm
    10–11

Cite This Page

Hamilton, P. (2012). Navicula elsoniana. In Diatoms of North America. Retrieved April 27, 2024, from https://diatoms.org/species/navicula_elsoniana

Responses

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