Eucocconeis alpestris
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Category
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Length Range11.5-22 µm
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Width Range5.9-7.6 µm
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Striae in 10 µm25-30
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SynonymsAchnanthes flexella var. alpestris Brun
Achnanthes alpestris (Brun) Lange-Bert. and Metzeltin
Eucocconeis flexella var. alpestris (Brun) Hust.
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ContributorMarina Potapova - Oct 2010
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ReviewerMark Edlund - Dec 2010
Identification
Description
Valves are rectangular-elliptical with slanted ends or in the shape of a parallelogram, often twisted. The raphe valve has an oblique narrow linear or slightly sigmoid axial area and a transversely rectangular central area. The raphe is slightly sigmoid with terminal raphe fissures curved to opposite directions. The rapheless valve has a narrow linear or slightly sigmoid axial area, which is also often oblique. The central area on rapheless valve is large, hexagonal to diamond-shaped or rounded. The striae are punctate, slightly radiate, or radiate on one side of the valve, but parallel to slightly convergent on the other side, 25-30 in 10 μm.
Autecology
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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
Var. : Alpestris. Nova, Pl. III, fig. 26. — L. 15 à 45 μ. — F.v. courbée, ventrue, à terminaisons larges, arrondies et un peu capitulées ; stries subtiles; nœud large, ordinairement conique. F.v. à simple courbure. Sources des Alpes et de la région montagneuse; assez commune.
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BasionymAchnanthes flexella var. alpestris
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AuthorBrun 1880
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Length Range15-45 µm
Original Images
Citations & Links
Citations
Links
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Index Nominum Algarum
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North American Diatom Ecological DatabaseNADED ID: 187005
Cite This Page
Potapova, M. (2010). Eucocconeis alpestris. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/44853/eucocconeis_alpestris
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Eucocconeis alpestris 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.
Eucocconeis alpestris
- Valves parallelogram-shaped
- Raphe oblique to apical axis
- Striae 25-30 in 10 μm
Valves are rectangular-elliptical with slanted ends or in the shape of a parallelogram. Raphe valve has a transversely rectangular central area. Raphe is oblique to the apical axis of the valve. Central area on rapheless valve is large, hexagonal to diamond-shaped or rounded. Striae are slightly radiate, or radiate on one side of the...