Navicula cari | Species - Diatoms of North America

Category

Symmetric Biraphid
Length Range

27-52 µm
Width Range

6.3-9.0 µm
Striae in 10 µm

10-13

Synonyms

Navicula cincta var. cari (Ehrenb.) Cleve 1895
Reported As

Navicula graciloides (Patrick and Reimer 1966, p. 516, plate 49, figs. 9-10)

Contributor

Loren Bahls - Jul 2012
Reviewer

Marina Potapova - Oct 2012

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Identification

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Description

Valves are lanceolate to linear-lanceolate with obtusely rounded to acutely rounded apices. The axial area is very narrow. The central area is laterally expanded and rounded to nearly rectangular. The raphe is filiform with weakly expanded proximal ends that are deflected slightly in the same direction and widely separated. Striae are curved and strongly radiate near the valve center, becoming straight and parallel to convergent near the apices. Areolae are indistinct and number 32 or more in 10 µm.

Autecology

Navicula cari is widely distributed in lakes, but also in creeks and rivers, throughout the Northwest United States. Here it prefers alkaline, nutrient-rich waters with average to higher conductivity and elevated concentrations of sulfate (see table below). It is usually present in low numbers.

Size Range, µm3

1001-10000
Motility

Moderately motile
Attachment

Unattached
Habitat

Benthic
Colony

Solitary
Occurrence

Rare
BCG

BCG 4
Waterbody

Inland Rivers Lakes
Distribution

Western rivers 2004 Southeast rivers 2014 California coastal rivers 2017 Northeast lake sediments
Learn more about this

Credit: Montana Diatom Database

Abundance-weighted means of selected water quality variables measured concurrently with the collection of samples containing Navicula cari.

Credit: Loren Bahls

Lake Levale, Bob Marshall Wilderness, Montana: home of Navicula cari.

Original Description

Author

Ehrenb. 1836

Citations & Links

Citations

Cite This Page

Bahls, L. (2012). Navicula cari. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/48158/navicula_cari

Responses

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