Aulacoseira valida
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Category
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Diameter7-16 µm
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Width Range10-16 µm
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Striae in 10 µm12-17
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SynonymsMelosira valida (Grunow in Van Heurck) F.Meister
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ContributorJonathan English, Marina Potapova - Dec 2010
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ReviewerSarah Spaulding - Aug 2013
Identification
Description
Frustules are cylindrical and form chains. Valves are 7-16 µm in diameter, with a mantle height of 7-16 µm. The ratio of the mantle height to valve diameter is 0.8-1.5. The mantle has thick walls. The valve face is slightly convex, covered by small areolae. Pervalvar rows of coarse, rectangular areolae are strongly curved to the right (dextrorse), 12-17 in 10 µm. There are 11-17 areolae in 10 µm along the pervalvar row. The mantle areolae are larger near the valve face and gradually become smaller toward the collum. The collum is approximately 1/3-1/5 of the mantle height. The spines are large, spatula-shaped and originate from two pervalvar costae. The ringleiste is solid and wide.
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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BCG
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Waterbody
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Distribution
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Original Description
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BasionymMelosira crenulata var. valida
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AuthorGrunow in Van Heurck 1882
Original Images
Citations & Links
Citations
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Publication Link: 10.1080/0269249X.2007.9705695
Links
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Index Nominum Algarum
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GenBank
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North American Diatom Ecological DatabaseNADED ID: 10029
Cite This Page
English, J., Potapova, M. (2010). Aulacoseira valida. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/45226/aulacoseira_valida
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Aulacoseira valida 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.
Aulacoseira valida
- Ratio of mantle height to valve diameter 0.8-1.5
- Rows of mantle areolae curve to the right
- Mantle areolae become smaller from valve face to collum
- Spines large, spatula-shaped
- Spines originate from two pervalvar costae
Valves have thick walls and are 10-16 µm in diameter, with a mantle height of 7-16 µm. The ratio of the mantle height to valve diameter is 0.8-1.5. The valve face is slightly convex, covered by small areolae. Pervalvar rows of areolae are strongly curved to the right (dextrorse), 12-17 in 10 µm. There are 11-17 areolae in 10 µm along the...