Diatoms of North AmericaDiatoms of North America

Navicula supleeorum

Bahls 2013

Navicula Supleeorum Guide
  • Category
    Symmetric Biraphid
  • Length Range
    23-32 µm
  • Width Range
    6.1-7.0 µm
  • Striae in 10 µm
    12-14

Identification

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

Valves are lanceolate in larger specimens, to elliptic-lanceolate in smaller specimens. Apices are acutely rounded, rounded in larger specimens and weakly apiculate in smaller specimens. The axial area is narrow, barely wider than the raphe and widening into a small, elliptic central area. The raphe is straight and weakly lateral, becoming filiform near the proximal and distal ends. The proximal raphe ends are dilated. The distal raphe fissures are hooked toward the secondary side. Striae are radiate, becoming parallel then weakly convergent at the apices. Alternate short-long-short striae are typical in the central area. Areolae are fine and number 30-32 in 10 µm.

Autecology

Navicula supleeorum is known to date only from the type locality: Rock Creek in Valley County, Montana. It has probably been mistaken for and lumped with N. cryptotenella in biological surveys. On the date the type sample was collected, pH in Rock Creek measured 8.30 and specific conductance measured 1402 µS/cm.

Original Description

Valves lanceolate in larger specimens to elliptic-lanceolate in smaller specimens. Valve length 23–32 μm; valve width 6.1–7.0 μm. Apices acutely rounded, not protracted in larger specimens, weakly protracted in smaller specimens. Axial area narrow, barely wider than the raphe, widening into a small elliptic central area. Raphe straight and weakly lateral, becoming filiform near the proximal and distal ends. External proximal raphe ends dilated. Striae radiate, becoming parallel then weakly convergent at the apices, 12–14 in 10 μm. Alternate short-long-short striae typical in the central area. Areolae 30–32 in 10 μm.

  • Author
    Bahls 2013
  • Length Range
    23-32 µm
  • Width
    6.1-7.0 µm
  • Striae in 10µm
    12-14

Original Images

Naviculasupleeorum Origimag007
Naviculasupleeorum Origdesc008

Cite This Page

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

Responses

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