Eunotia cataractarum
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Category
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Length Range11-21 µm
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Width Range3.1-3.9 µm
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Striae in 10 µm15-20 in the center valve, 16-19 at the ends, puncta 44-50
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ContributorPaula Furey - Feb 2011
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ReviewerMarina Potapova - Mar 2011
Identification
Description
Valves are concave on the ventral margin, sometimes with scarcely visible swellings on the ventral margin, marking the position of the proximal raphe ends. Valves have a slightly convex, flattened dorsal margin. The apices are set off dorsally by a fairly steep sloping shoulder. Apices are capitate and rounded. Helictoglossae are not visible in the LM. One apical rimoportula at the center of the apex, with a distinct external pore (visible in SEM). Striae are parallel to slightly radiate.
Autecology
Eunotia cataractarum is commonly found in the epilithon or epiphytic on bryophytes at waterfalls, and occasionally in streams in the Great Smoky Mountains National Park.
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Size Range, µm3
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Motility
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Habitat
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Waterbody
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Original Description
Valves concave on the ventral margin, sometimes with scarcely visible swellings marking the position of the proximal raphe ends. Slightly convex flattened dorsal margin, with apices set off dorsally by a fairly steep sloping shoulder. Apices capitate, rounded. Helictoglossae not visible in the light microscope. Rimoportula at one end of valve, at the center of the apex, with a distinct external pore. Striae parallel to slightly radiate, 15 – 20 in 10 μm in the valve center, 16 – 19 in 10 μm at the apices. Puncta 44 – 50 in 10 μm.
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AuthorFurey, Lowe and Johansen 2011
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Length Range11-21 µm
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Width3.1-3.9 µm
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Striae in 10µm15-20 in the center valve, 16-19 at the ends, puncta 44-50
Original Images
Cite This Page
Furey, P. (2011). Eunotia cataractarum. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/45600/eunotia_cataractarum
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Eunotia cataractarum 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.
Eunotia cataractarum
- Ventral margin concave
- Dorsal margin slightly convex
- Apices capitate
- Striae parallel to slightly radiate
- One apical rimoportula
Valves with a concave ventral margin. The dorsal margin is slightly convex and set off dorsally by a steep sloping shoulder. Apices are capitate and rounded. Striae are parallel to slightly radiate. One apical rimoportula at the center of the apex (visible in SEM), with a distinct external pore. .