Navicula radiosa | Species - Diatoms of North America

Category

Symmetric Biraphid
Length Range

52-105 µm
Width Range

8.8-11.2 µm
Striae in 10 µm

9-11

Contributor

Marina Potapova - Mar 2011
Reviewer

Sarah Spaulding - Dec 2011

Identification

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Description

The valves are narrow and lanceolate, with acutely rounded ends. The axial area is narrow and linear. The central area is rhombic. The raphe is straight with proximal ends that are hooked to the secondary side. The transapical striae are strongly radiate, bent in the valve center and convergent near the poles. Lineolae number 28-32 in 10 μm.

Note that this concept of N. radiosa is similar to that of Lange-Bertalot (2001) and includes considerable morphological variation, especially in the overall shape of the valve and in the shape of the apices. Further investigations may reveal pseudocryptic species within N. radiosa.

Autecology

This taxon is common in rivers and lakes of the US. It is considered a tolerant species and is found in waters of high conductance and nutrient concentrations. It is able to live in rivers with embedded benthic substrates, in turbid waters, and tolerates human disturbance.

Size Range, µm3

101-1000
Motility

Moderately motile
Attachment

Unattached
Habitat

Benthic
Colony

Solitary
Occurrence

Common
BCG

BCG 4
Waterbody

Inland Rivers Lakes
Distribution

Western rivers 2004 Southeast rivers 2014 California coastal rivers 2017 Northeast lake sediments Great Lakes inventory
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Original Description

NAVICULA RADIOSA. Taf. 4. Fig. XXIIl, (420/1). N. mediocris lanceolata, gracilίs, acuta, striis radiantibus distinctis, in 1/100’’’15-18. Long.1/30‘‘‘ In Süsswassergräben bei Halle! Weissenfels ! Nordhausen! — Die Streifen sind stärker und deutlicher als bei N. gracilis, der sie übrigens sehr ähnlich ist.

Author

Kütz. 1844
Length Range

75 µm
Striae in 10µm

6.6-8.0

Original Images

Citations & Links

Citations

Cite This Page

Potapova, M. (2011). Navicula radiosa. In Diatoms of North America. Retrieved December 30, 2024, from https://diatoms.org/species/45847/navicula_radiosa

Responses

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