• Category
  • Length Range
    36-69 µm
  • Width Range
    10-12.5 µm
  • Striae in 10 µm
  • Synonyms
    Navicula viridula var. slesvicensis (Grunow in Van Heurck) Grunow in Cleve and J.D.Möller



Valves are linear-elliptic to linear-lanceolate with apices that are wedge-shaped in smaller specimens and more produced, subrostrate in larger specimens. The axial area is narrow and straight. The central area is transversely elliptic or irregularly rhomboid. The raphe is straight, moderately lateral, with dilated external proximal raphe ends. The central nodule is symmetric. Striae are radiate in the valve center, more widely spaced about the central area and convergent at the apices. The areolae are visible under LM and number approximately 25 in 10 μm.


Navicula slesvicensis has been reported from creeks and rivers in Montana, North Dakota and Wyoming, where it prefers warm, muddy waters rich in sodium sulfate and organic nitrogen. Common diatom associates of N. slesvicensis in these streams include Navicula peregrina, Entomoneis paludosa, Navicula salinarum, Ctenophora pulchella, Entomoneis alata, Biremis circumtexta, Craticula halophila, Tabularia fasciculata, Pleurosigma delicatulum, Fragilaria famelica, Navicula goersii, and Fallacia tenera. In Europe, Navicula slesvicensis is found in electrolyte-rich freshwaters and in coastal waters, estuaries, and inland salt springs (Lange-Bertalot 2001).

Original Description

  • Author
    Grunow in Van Heurck 1880

Original Images

Naslesvicensis  Orig Ill

Cite This Page

Potapova, M., Bahls, L. (2011). Navicula slesvicensis. In Diatoms of North America. Retrieved June 13, 2024, from https://diatoms.org/species/navicula_slesvicensis


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