Credit: Loren Bahls
Governor Pond and Grinnell Point, Swiftcurrent Valley, Glacier National Park, Montana. Governor Pond is home to Navicula wildii.
Navicula wildii
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Category
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Length Range29-49 µm
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Width Range6.3-7.8 µm
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Striae in 10 µm12-14
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Reported AsNavicula species 1 (Krammer and Lange-Bertalot 1986)
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ContributorLoren Bahls - Mar 2012
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ReviewerSarah Spaulding - Mar 2012
Identification
Description
Valves are narrowly lanceolate with gradually attenuated, obtusely rounded apices. The raphe is filiform. Proximal raphe ends are bent to the secondary side. Distal raphe fissures are also bent to the secondary side. The axial area is narrow and merges into a small, lanceolate to rhombic central area formed by irregularly shortened striae. Striae are radiate, becoming parallel and then convergent at the apices. Areolae are indistinct and number 30–36 in 10 μm.
Autecology
Navicula wildii is widely distributed in lakes and streams in western Montana and southern Alberta, where it is present in low numbers. In these waters it prefers neutral to moderately alkaline pH and low to moderate levels of electrolytes (see table below).
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Size Range, µm3
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Motility
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Attachment
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Habitat
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Colony
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Occurrence
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BCG
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Waterbody
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Distribution
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Credit: Montana Diatom Database
Abundance-weighted means of selected water quality variables measured concurrently with the collection of samples containing Navicula wildii.
Original Description
Valves (narrow) lanceolate, gradually narrowing to obtusely rounded ends, very rarely almost imperceptibly protracted, length 23-50 μm, breadth 5.5-7.5 μm. Raphe usually filiform, central pores distinct (when correctly focused), appearing a little hook-shaped. Axial area narrow, linear, widened to a small, irregularly bordered, usually lanceolate to rhombic central area. Striae strongly radiate, abruptly parallel and finally convergent at the ends, 11-12.5/10 μm. Lineolae difficult to separate (in LM), 30-33(35?) in 10 μm.
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AuthorLange-Bert. 1993
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Length Range23-50 µm
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Width5.5-7.5 µm
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Striae in 10µm11-12.5
Original Images
Citations & Links
Citations
Links
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Index Nominum Algarum
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North American Diatom Ecological DatabaseNADED ID: 46660
Cite This Page
Bahls, L. (2012). Navicula wildii. In Diatoms of North America. Retrieved December 26, 2024, from https://diatoms.org/species/47261/navicula_wildii
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Navicula wildii 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.
Navicula wildii
- Valves narrowly lanceolate
- Apices gradually attenuated and obtusely rounded
- Striae 12-14 in 10 μm
- Areolae 30-36 in 10 μm
Navicula wildii has narrow lanceolate valves with gradually attenuated and obtusely rounded apices. Striae number 12-14 in 10 μm. Areolae are not visible in LM, but number 30-36 in 10 μm.