Diatoms of North AmericaDiatoms of North America

Navicula erifuga

Lange-Bert. in Krammer and Lange-Bert. 1985

N Erifuga Guide
  • Category
    Symmetric Biraphid
  • Length Range
    21-36 µm
  • Width Range
    5–7 µm
  • Striae in 10 µm
    12–14
  • Synonyms
    Navicula leptocephala Bréb. ex Grunow in Van Heurck
  • Reported As
    Navicula tripunctata var. schizonemoides (early ANSP (1970-80's) usage)

Identification

Navicula erifuga LM7 Navicula erifuga LM2 Navicula erifuga LM4 Navicula erifuga LM5 Navicula erifuga LM6 Navicula erifuga LM3 Navicula erifuga LM1
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Navicula erifuga SEM2 Navicula erifuga SEM1

Description

Valves are lanceolate with acutely rounded ends. The raphe is filiform. The central portions of the raphe branches and proximal raphe ends are deflected toward the primary side. Terminal raphe fissures are hooked towards the secondary side. The axial area is narrow and linear. The central area is asymmetric, "bow-tie" shaped on the primary side and crescent-shaped at the secondary side. The lineolate striae are radiate, becoming convergent at the valve apices. Striae number 12-14 in 10 µm and areolae number 30-35 in 10 µm.

Autecology

Navicula erifuga prefers brackish water or fresh water of high mineral content, and it is tolerant of high nutrient concentrations.

Original Description

Cite This Page

Potapova, M. (2009). Navicula erifuga. In Diatoms of North America. Retrieved April 23, 2024, from https://diatoms.org/species/navicula_erifuga

Responses

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