Diatoms of North AmericaDiatoms of North America

Encyonopsis czarneckii

Bahls 2013

Encyonopsis Czarnecki Guide
  • Category
    Asymmetric Biraphid
  • Length Range
    19.6-30.1 µm
  • Width Range
    3.7-5.2 µm
  • Striae in 10 µm
    22-24 at the valve center, 24-26 near the apices

Identification

Encyonopsis Czarneckii 1 Encyonopsis Czarneckii 2 Encyonopsis Czarneckii 3 Encyonopsis Czarneckii 4 Encyonopsis Czarneckii 5 Encyonopsis Czarneckii 6 Encyonopsis Czarneckii 7
View image metadata

Description

Valves are linear-lanceolate and slightly dorsiventral with capitate apices. The axial area is narrow and near the valve midline. The central area is small and asymmetric, rounded on the dorsal side and defined by two or three unevenly shortened striae on the ventral side. The raphe is weakly lateral, narrowing near the proximal and distal ends. Proximal raphe ends are weakly expanded and deflected dorsally. Distal raphe fissures are hooked toward the ventral side. Striae are radiate throughout.

Autecology

Encyonopsis czarneckii is widely distributed and locally abundant in lakes of the northern Rocky Mountains. The type locality is Lake McDonald in Glacier National Park (photo below). On the date the type sample was collected, Lake McDonald had a pH of 8.7 and specific conductance of 92 µS/cm.

Lake Mc Donald October 4 2007
Credit: Glacier National Park webcam.
Lake McDonald, Glacier National Park, Montana: type locality of Encyonopsis czarneckii.

Original Description

Valves linear-lanceolate, slightly dorsiventral. Apices capitate. Valve length 19.6–30.1 µm; valve width 3.7–5.2 µm. Axial area narrow, near valve midline. Central area small, asymmetric, rounded on the dorsal side, defined by two unevenly shortened striae on the ventral side. Raphe weakly lateral, filiform near the proximal and distal ends. Proximal raphe ends weakly expanded, deflected dorsally. Distal raphe fissures hooked toward the ventral side. Striae radiate throughout, 22–24 in 10 µm at valve center, 24–26 in 10 µm near the apices.

  • Author
    Bahls 2013
  • Length Range
    19.6-30.1 µm
  • Width
    3.7-5.2 µm
  • Striae in 10µm
    22-24 at valve center, 24-26 near the apices

Original Images

Encyonopsis czarneckii orig illus
Encyo Czarneckii Origdesc001

Cite This Page

Bahls, L. (2013). Encyonopsis czarneckii. In Diatoms of North America. Retrieved December 03, 2024, from https://diatoms.org/species/encyonopsis_czarneckii

Responses

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