• Category
  • Length Range
    29-49 µm
  • Width Range
    6.3-7.8 µm
  • Striae in 10 µm
    12-14
  • Reported As
    Navicula species 1 (Krammer and Lange-Bertalot 1986)

Identification

Description

Valves are narrowly lanceolate with gradually attenuated, obtusely rounded apices. The raphe is filiform. Proximal raphe ends are bent to the secondary side. Distal raphe fissures are also bent to the secondary side. The axial area is narrow and merges into a small, lanceolate to rhombic central area formed by irregularly shortened striae. Striae are radiate, becoming parallel and then convergent at the apices. Areolae are indistinct and number 30–36 in 10 μm.

Autecology

Navicula wildii is widely distributed in lakes and streams in western Montana and southern Alberta, where it is present in low numbers. In these waters it prefers neutral to moderately alkaline pH and low to moderate levels of electrolytes (see table below).

Governor  Pond And  Grinnell  Point
Credit: Loren Bahls
Governor Pond and Grinnell Point, Swiftcurrent Valley, Glacier National Park, Montana. Governor Pond is home to Navicula wildii.
Navwildii Chem
Credit: Montana Diatom Database
Abundance-weighted means of selected water quality variables measured concurrently with the collection of samples containing Navicula wildii.

Original Description

Valves (narrow) lanceolate, gradually narrowing to obtusely rounded ends, very rarely almost imperceptibly protracted, length 23-50 μm, breadth 5.5-7.5 μm. Raphe usually filiform, central pores distinct (when correctly focused), appearing a little hook-shaped. Axial area narrow, linear, widened to a small, irregularly bordered, usually lanceolate to rhombic central area. Striae strongly radiate, abruptly parallel and finally convergent at the ends, 11-12.5/10 μm. Lineolae difficult to separate (in LM), 30-33(35?) in 10 μm.

  • Author
    Lange-Bert. 1993
  • Length Range
    23-50 µm
  • Width
    5.5-7.5 µm
  • Striae in 10µm
    11-12.5

Original Images

Nwildii Origimag
Nwildii Origdesc

EMAP Assessment

EMAP Distribution

Navicula Wildii 40
Map 40

Response Plots

Navicula Wildii

Cite This Page

Bahls, L. (2012). Navicula wildii. In Diatoms of North America. Retrieved August 20, 2018, from https://diatoms.org/species/navicula_wildii

Responses

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