Diatoms of North AmericaDiatoms of North America

Stauroneis vandevijveri

Bahls 2010

Stauroneis Vandevijveri Guide
  • Category
    Symmetric Biraphid
  • Length Range
    48-73 µm
  • Width Range
    9.5-12.5 µm
  • Striae in 10 µm
    19-23
  • Reported As
    Stauroneis “arctic-anceps” manuscript name (Van de Vijver et al. 2004, Pl. 39, Figs 1-10)

Identification

Stauroneis vandevijveri LM2 Stauroneis vandevijveri LM1 Stauroneis vandevijveri LM3 Stauroneis vandevijveri LM5 Stauroneis vandevijveri LM4
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Description

Valves are lanceolate with rostrate to subcapitate apices. The axial area is narrow and linear, not widening towards the central area. The stauros is broad, expanded toward the valve margins like a bow tie. External raphe fissures are weakly lateral. Proximal raphe ends are straight and not expanded. Striae are radiate throughout and curved near the central area. Areolae are very fine and number 24-28 in 10 µm.

Autecology

Stauroneis vandevijveri has been recorded from two ponds in southwestern Montana, where pH measured 6.5 and 7.8 and specific conductance measured 25 and 27 µS/cm. This taxon was reported as Stauroneis arctic-anceps (invalid manuscript name) from a shallow ditch in the Russian Arctic (Van de Vijver et al. 2004).

Bloody Dick Pond 1 1
Credit: Loren Bahls
Bloody Dick Pond #1, Beaverhead County, Montana: type locality for Stauroneis vandevijveri.

Original Description

Valves lanceolate with rostrate to subcapitate ends. Length 48-73 µm, width 9.5-12.5 µm. Axial area narrow, linear, not widening towards the central area. Central area a broad fascia, expanded toward the valve margins. Raphe weakly lateral, proximal endings practically straight, central pores not inflated. Striae curved, radiate throughout, 19-23 in 10 µm. Striae puncta very fine, 24-28 in 10 µm. For measurements, n = 25 valves.

  • Author
    Bahls 2010
  • Length Range
    48-73 µm
  • Width
    9.5-12.5 µm
  • Striae in 10µm
    19-23

Original Images

Svandevijveri Origimag
Svandevijveri Origdesc

Cite This Page

Bahls, L. (2011). Stauroneis vandevijveri. In Diatoms of North America. Retrieved November 23, 2024, from https://diatoms.org/species/stauroneis_vandevijveri

Responses

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