Credit: Barb Johnston, Parks Canada
Indian Springs Ponds, Waterton Lakes National Park, Alberta, Canada: home of Craticula sardiniana.
Craticula sardiniana
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Category
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Length Range68-113 µm
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Width Range15.6-19.5 µm
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Striae in 10 µm14 (middle) to 18 (ends)
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Reported AsCraticula "silviae" (Lange-Bertalot 2001)
Craticula (?) acidoclinata (Lange-Bertalot et al. 2003)
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ContributorLoren Bahls - Jun 2012
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ReviewerSarah Spaulding - Aug 2013
Identification
Description
Valves are lanceolate with broadly rounded apices. The axial area is linear and narrow. The central area is elliptic with convex sides, and about two times wider than the axial area. The raphe is weakly lateral, with straight and slightly inflated proximal ends. Striae are parallel in the middle, becoming weakly radiate and then convergent near the apices. Areolae may be resolved in LM and number 26 in 10 µm.
Autecology
Craticula sardiniana has been collected from two ponds in the northern Rocky Mountains where pH ranges from 7.8 to 11.1 and specific conductance ranges from 49 to 313 µS/cm. Its preference for alkaline waters with higher electrolyte content sets this taxon apart from Craticula acidoclinata, which prefers acidic or circumneutral waters with very low electrolyte content. Craticula sardiniana was first reported (as ? Craticula acidoclinata) from rock pools in Sardinia rich in electrolytes (Lange-Bertalot et al. 2003).
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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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Credit: Loren Bahls
Skinner Pond No. 1, Beaverhead County, Montana: home of Craticula sardiniana.
Original Description
Valves lanceolate with broadly rounded, unprotracted apices. Valve length 68–113 μm; valve width 15.6–19.5 μm. Axial area linear and narrow. Central area elliptic with convex sides, about two times wider than axial area. Raphe weakly lateral with straight and slightly inflated proximal ends. Striae parallel in the middle, becoming weakly radiate, then convergent near the apices, 14 in 10 μm at the valve center to 18 in 10 μm near the apices. Areolae 26 in 10 μm. Craticula valves observed; “Heribaudii” valves not observed.
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AuthorBahls 2013
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Length Range68-113 µm
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Width15.6-19.5 µm
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Striae in 10µm14 at valve center, 18 near the apices
Original Images
Citations & Links
Citations
Links
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Index Nominum Algarum
Cite This Page
Bahls, L. (2012). Craticula sardiniana. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/48663/craticula_sardiniana
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Craticula sardiniana 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.
Craticula sardiniana
- Valves lanceolate
- Apices not protracted
- Central area elliptic
Valves are large (68-113 µm long) and lanceolate with rounded apices. The central area is elliptic, with convex sides.