Navicula erifuga | Species - Diatoms of North America

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)

Contributor

Marina Potapova - May 2009
Reviewer

Sarah Spaulding - May 2010

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Identification

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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.

Size Range, µm3

101-1000
Motility

Moderately motile
Attachment

Unattached
Habitat

Benthic
Colony

Solitary
Occurrence

Rare
BCG

BCG 5
Waterbody

Inland
Distribution

Western rivers 2004 California coastal rivers 2017
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Original Description

Citations & Links

Citations

Krammer, K. and Lange-Bertalot, H. (1985) Naviculaceae Neue und wenig bekannte Taxa, neue Kombinationen und Synonyme sowie Bemerkungen zu einigen Gattungen. Bibliotheca Diatomologica 9:5-230, 43 pls.

Cite This Page

Potapova, M. (2009). Navicula erifuga. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/44506/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.