• Category
  • Length Range
    122-182 µm
  • Width Range
    26-33 µm
  • Striae in 10 µm
    11-12

Identification

Description

Valves are broadly lanceolate with rounded apices. A prominent pseudoseptum is present at each apex. The axial area is broad, about three times the width of the raphe, and becomes wider near the central area. The central area is a nearly rectangular stauros, expanding slightly near the valve margins. External raphe fissures are lateral, becoming reverse lateral and strongly curved near the large, proximal pores. Striae are radiate throughout and extend onto the valve mantles. Areolae are round, coarse and number 12-16 in 10 µm. Cells are commonly joined, face-to-face, in colonies.

Autecology

Stauroneis kishinena is known only from the type locality, Starvation Ridge Pond in Glacier National Park, which it shares with S. americana and S. finlandia. Water quality measurements were not taken at this site.

Dscn2204 1
Credit: Billy Schweiger, National Park Service
Starvation Ridge Pond, Glacier National Park, Montana: type locality of Stauroneis kishinena.

Original Description

Frustules commonly found adherent face-to-face in short chains; intercalary bands evident in girdle view. Valves broadly lanceolate with rounded ends that appear subtly protracted only in very large specimens. Length 122-182 µm, width 26-33 µm. A prominent pseudoseptum is present at each end. Axial area broad, expanding in deltoid fashion into the central area. Central area a nearly rectangular fascia, widening slightly near valve margins. Raphe fissures lateral, becoming reverse lateral and strongly hooked near the large central pores. Distal raphe fissures hooked toward the secondary side. Striae radiate throughout, continuing over onto the valve mantles, 11-12 in 10 µm. Striae puncta 12-16 in 10 µm. For measurements, n = 30 valves.

  • Author
    L.L.Bahls 2010
  • Length Range
    122-182 µm
  • Width
    26-33 µm
  • Striae in 10µm
    11-12

Original Images

Skish Origimage
Skish Origdesc

Cite This Page

Bahls, L. (2011). Stauroneis kishinena. In Diatoms of North America. Retrieved August 19, 2018, from https://diatoms.org/species/stauroneis_kishinena

Responses

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