• Category
  • Length Range
    9.5-14.5 µm
  • Width Range
    2.5 µm

Identification

Description

The valves are small and lanceolate or linear-lanceolate with apices that are extremely narrowly rounded and often protracted. The striae are generally biseriate but become multiseriate and disorganized near the raphe canal. The striae are not resolvable in the LM, but the presence of transapical costae gives the valves the appearance of having resolved striae. The costa density is 18 in 10 microns.

Autecology

Original Description

  • Basionym
    Nitzschia delognei
  • Author
    Grunow in Van Heurck 1885

Original Images

Simonseniapic
Simonseniatxt

EMAP Assessment

EMAP Distribution

Simonsenia Delognei   Grunow   Lange  Bertalot 3
Map 3

Response Plots

Simonsenia Delognei   Grunow   Lange  Bertalot

Cite This Page

Graeff, C. (2012). Simonsenia delognei. In Diatoms of North America. Retrieved June 25, 2018, from https://diatoms.org/species/simonsenia_delognei

Responses

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