Encyonopsis lacusalpini | Species - Diatoms of North America

Category

Asymmetric Biraphid
Length Range

11.3-12.6 µm
Width Range

3.0-3.4 µm
Striae in 10 µm

26-29

Contributor

Loren Bahls - May 2013
Reviewer

Mark Edlund - Aug 2013

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Identification

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Description

Valves are elliptic-lanceolate and not or slightly dorsiventral. Apices are subcapitate. The axial area is narrow and a central area is lacking. The raphe is filiform. Proximal raphe ends are not expanded and deflected dorsally. Distal raphe fissures are hooked toward the ventral margin. Striae are parallel to weakly radiate, somewhat more prominent and more widely spaced near the valve center.

Autecology

Encyonopsis lacusalpini is known only from Upper Trilobite Lake, a small alpine lake on the Continental Divide in the heart of the Bob Marshall Wilderness of Montana (photo below). Water quality data are not available.

Size Range, µm3

11-100
Motility

Slightly motile
Attachment

Unattached
Habitat

Benthic
Colony

Solitary
Waterbody

Inland
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Credit: Loren Bahls

Upper Trilobite Lake, Bob Marshall Wilderness, Montana: type locality of Encyonopsis lacusalpini.

Original Description

Valves elliptic-lanceolate, not or slightly dorsiventral. Apices subcapitate. Valve length 11.3–12.6 µm; valve width 3.0–3.4 µm. Axial area narrow. Central area lacking. Raphe filiform. Proximal raphe ends not expanded, deflected dorsally. Distal raphe fissures hooked toward the ventral margin. Striae parallel to weakly radiate, somewhat more widely spaced near the valve center, 26–29 in 10 µm.

Author

Bahls 2013
Length Range

11.3-12.6 µm
Width

3.0-3.4 µm
Striae in 10µm

26-29

Original Images

Citations & Links

Citations

Cite This Page

Bahls, L. (2013). Encyonopsis lacusalpini. In Diatoms of North America. Retrieved December 21, 2024, from https://diatoms.org/species/49307/encyonopsis_lacusalpini

Responses

The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Encyonopsis lacusalpini 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.