Epithemia adnata
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Category
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Length Range32-70 µm
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Width Range7.5-9.7 µm
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Striae in 10 µm12-14
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ContributorRex Lowe - Dec 2010
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ReviewerSarah Spaulding - Dec 2010
Identification
Description
Valves are dorsiventral and are 32-70 μm long and 7.5-9.7 μm wide. Valves taper toward rounded to rostrate ends. Striae are 12-14 in 10 μm and costae are 4-5 in 10 μm. There are 3-7 striae between costae. The dorsal margin is strongly convex and the ventral margin is moderately concave. The raphe canal lies against the ventral margin at distal ends of the valve and arches toward the dorsal margin in the valve center. The central arch of the canal is approximately 3-6 μm above the ventral margin reaching less than half the distance to the dorsal margin.
Autecology
This taxon is often in aggregates in areas of low N/P ratio. Often epiphytic. Like other species of Epithemia, E. adnata contains endosymbiotic N-fixing cyanobacteria.
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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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Nitrogen Fixer
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BCG
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Waterbody
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Distribution
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Original Description
Frustulis adnatis fuscis crassiusculis cymbiformibus opacis, saepe hyalino-marginatis, media interdum fascia transversali hyalina notatis, utrinque truncatis, plerumque binatim conjunctis.
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BasionymFrustulia adnata
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AuthorKütz. 1833
Original Images
Citations & Links
Citations
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Publication Link: 10.1080/0269249X.2024.2388108
Links
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North American Diatom Ecological DatabaseNADED ID: 32003
Cite This Page
Lowe, R. (2010). Epithemia adnata. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/45303/epithemia_adnata
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Epithemia adnata 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.
Epithemia adnata
- Striae 12-14 in 10 μm
- Costae 3-4 in 10 μm
- Raphe canal lies against ventral margin at distal ends of valve arching toward the dorsal margin in valve center
- Central arch of canal approximately 3-6 μm above the ventral margin reaching less than half the distance to the dorsal margin
Valves are dorsiventral, with rounded to rostrate ends. Striae 12-14 in 10 μm, costae are 3-4 in 10 μm with 3-7 striae between costae. Dorsal margin is strongly convex and ventral margin is moderately concave. Raphe canal lies against the ventral margin at distal ends of the valve arching toward the dorsal margin in valve center. The...