Credit: Becca Rapelje
Weeping Wall along the Going-To-The-Sun Road in Glacier National Park, Montana. A similar habitat nearby supported a large population of Cymbella laevis.
Cymbella laevis
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Category
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Length Range21.0-35.2 µm
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Width Range4.9-7.7 µm
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Striae in 10 µm13-17 dorsal and 16-20 ventral at the valve center; 18-22 at the apices
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ContributorLoren Bahls - Jun 2016
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ReviewerMarina Potapova - Jun 2016
Identification
Description
Valves are lanceolate with very narrow, weakly protracted apices. The dorsal margin is moderately arched; the ventral margin is somewhat less arched. The axial area gradually widens to merge with a slightly wider, but poorly defined central area. The raphe is lateral, becoming reverse-lateral at the proximal ends. Proximal raphe ends are deflected ventrally and terminate with very small central pores. Terminal raphe fissures are deflected dorsally. Striae are finely punctate and radiate. Areolae are distinct in LM. Isolated stigmata are absent.
Autecology
The specimens on this web page were collected from a mossy seep at the base of the Garden Wall along the Going-To-The-Sun Road in Glacier National Park, Montana.
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Size Range, µm3
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Motility
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Attachment
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Habitat
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Colony
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Waterbody
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Distribution
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Original Description
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AuthorNaegeli in Kütz. 1849
Original Images
Citations & Links
Citations
Links
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Index Nominum Algarum
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GenBank
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North American Diatom Ecological DatabaseNADED ID: 23093
Cite This Page
Bahls, L. (2016). Cymbella laevis. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/51476/cymbella_laevis
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Cymbella laevis 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.
Cymbella laevis
- Valves <8 µm wide
- Apices narrow
- Striae >12 in 10 µm
Valves are small and less than 8 µm wide. The apices are narrow, and weakly protracted. Striae number more than 12 in 10 µm at the valve center. Areolae are very fine and difficult to resolve in LM. Stigmata are absent.