Credit: Loren Bahls
Kootenai Pond, Glacier National Park, Montana: home of Encyonema vulgare
Encyonopsis cesatiformis
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Category
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Length Range26-43 µm
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Width Range5.4-7.6 µm
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Striae in 10 µm17-19 near the valve center, 19-21 near the ends
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Reported AsEncyonopsis montana (Bahls 2013, figs. 89, 90)
Encyonopsis cesatii var. geitleri (Bahls 2012, Diatoms of the US)
Encyonopsis montana (Bahls 2013, Diatoms of the US)
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ContributorLoren Bahls - Jun 2014
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ReviewerSarah Spaulding - Sep 2014
Identification
Description
Valves are broadly lanceolate and nearly symmetric with respect to the apical axis. Apices are rostrate and deflected slightly to the ventral side. The axial area is narrow. The central area is small and asymmetric, rounded on the dorsal side and the ventral side with two or three shortened striae. The raphe is weakly lateral. Proximal raphe ends are deflected toward the dorsal side and distal raphe ends are hooked toward the ventral side. Striae are radiate throughout. Areolae are very fine and difficult to resolve in LM.
Autecology
Encyonopsis cesatiformis was collected from a wetland and a small pond (pictured below) in Glacier National Park, Montana. The pH of the pond on the collection date was 7.78 and the specific conductance measured 139 µS/cm. Encyonopsis cesatiformis was described from material collected from a wetland in Finnish Lapland. It is also found in the European Alps. Krammer (1997) describes its preferred habitat as oligotrophic waters with low electrolyte content.
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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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Original Description
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AuthorKrammer 1997
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Length Range26-49 µm
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Width6.9-9.0 µm
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Striae in 10µm16-17
Original Images
Citations & Links
Citations
Links
Cite This Page
Bahls, L. (2014). Encyonopsis cesatiformis. In Diatoms of North America. Retrieved December 21, 2024, from https://diatoms.org/species/49625/encyonopsis_cesatiformis
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Encyonopsis cesatiformis 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.
Encyonopsis cesatiformis
- Valves broadly lanceolate
- Valves up to 43 µm long
- Striae radiate, 17-19 in 10 µm
- Central area small, asymmetric
Encyonopsis cesatiformis has broadly lanceolate valves up to 43 µm long and 7.6 µm wide. The striae are radiate and number 17-19 in 10 µm near the central area. The central area is small and asymmetric.