• Category
  • Length Range
    29.5-63 µm
  • Width Range
    8-11 µm
  • Striae in 10 µm
    9-10 at the center
  • Synonyms
    Cymbella hebridica Cleve

Identification

Description

Valves are moderately dorsiventral with slightly or moderately rostrate, narrowly rounded apices. The dorsal margin is moderately arched. The ventral margin is moderately tumid at the center in larger specimens to convex in smaller specimens. The axial area is narrow. The central area is rounded in larger specimens and indistinct in small specimens. The striae are slightly radiate across most of the valve, except at the apices where they are slightly convergent. Internally, the proximal raphe ends are strongly deflected dorsally.

Autecology

Original Description

  • Author
    Gregory 0

Cite This Page

Graeff, C. (2012). Encyonema hebridicum. In Diatoms of North America. Retrieved July 21, 2018, from https://diatoms.org/species/encyonema_hebridicum

Responses

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