Stauroneis separanda | Species - Diatoms of North America

Category

Symmetric Biraphid
Length Range

13.9-15.3 µm
Width Range

3.8-4.8 µm
Striae in 10 µm

30

Contributor

Loren Bahls - Dec 2012
Reviewer

Sarah Spaulding - Aug 2013

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Identification

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Description

Valves are linear-lanceolate with triundulate margins and short rostrate-apiculate apices. Valves are widest at the center. A pseudoseptum is present at each apex. The axial area is very narrow and linear, becoming wider near the central area. The central stauros is narrow and linear. The raphe is filiform with straight and weakly inflated proximal ends. Striae are parallel at the center to weakly radiate near the apices. Areolae are very fine and difficult to resolve in LM.

Autecology

Werum & Lange-Bertalot (2004) report that S. separanda is widely distributed in chalk-rich springs in Europe. It is probably also common in head-water habitats in North America, but under-reported here because of its close resemblance to the more familiar S. smithii.

Size Range, µm3

11-100
Motility

Moderately motile
Attachment

Unattached
Habitat

Moist habitats Benthic
Colony

Solitary
Waterbody

Inland
Learn more about this

Credit: Barb Johnston, Parks Canada

Blakiston Beaver Pond A on Blakiston Creek in Waterton Lakes National Park, Alberta: home of Stauroneis separanda.

Original Description

Author

Lange-Bert. and Werum in Werum and Lange-Bert. 2004
Length Range

13-17 µm
Width

3.6-4.7 µm
Striae in 10µm

27-29

Original Images

Citations & Links

Citations

Werum, M. and Lange-Bertalot, H. (2004) Diatoms in springs, from Central Europe and elsewhere under the influence of hydrogeology and anthropogenic impages Iconographia Diatomologica 13: 1-417

Cite This Page

Bahls, L. (2012). Stauroneis separanda. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/49149/stauroneis_separanda

Responses

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