Navicula wildii

Lange-Bertalot 1993      Category: Symmetrical biraphid
BASIONYM: Navicula wildii Lange-Bertalot 1993

REPORTED AS: Navicula species 1 (Krammer and Lange-Bertalot 1986) 

Navicula whitefishensis

 

Navicula winona
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LM scalebar = 10 µm = 80 pixels.

Observations

Contributor: Loren Bahls - March 2012
Length Range: 29-49 µm
Width Range: 6.3-7.8 µm
Striae in 10 µm: 12-14

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.

Original Description

Basionym: Navicula wildii
Author: Lange-Bertalot 1993
Length Range: 23-50 µm
Width Range: 5.5-7.5 µm
Striae in 10 µm: 11-12.5

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.

Original Images

Cite This Page:
Bahls, L. (2012). Navicula wildii. In Diatoms of the United States. Retrieved May 24, 2013, from http://westerndiatoms.colorado.edu/taxa/species/navicula_wildii

Species: Navicula wildii

Contributor: Loren Bahls

Reviewer: Sarah Spaulding

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Image Credit: Loren Bahls

  1. Valves narrowly lanceolate
  2. Apices gradually attenuated and obtusely rounded
  3. Striae 12-14 in 10 μm
  4. 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.

Compare

Navicula winona differs by its lower areola density. Navicula densilineolata has non-attenuated, acutely rounded apices and more coarse areolae (27–30 in 10 μm). Valves of Navicula cryptotenella are smaller, lack long attenuated apices, and have higher stria and areola density. Navicula notha is smaller and has higher stria and areola density. The ends of Navicula radiosafallax are not attenuated and are obtusely wedge-shaped.

Navicula winona

Navicula cryptotenella

Navicula notha

Navicula radiosafallax

Navicula densilineolata

Lange-Bertalot 1993

Citations

Bahls, L.L. (2012). Seven new species in Navicula sensu stricto from the Northern Great Plains and Northern Rocky Mountains. Nova Hedwigia, Beiheft 141: 19–38.

Krammer, K. and Lange-Bertalot, H. (1986). Bacillariophyceae. 1. Teil: Naviculaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Susswasserflora von Mitteleuropa, Band 2/1. Gustav Fisher Verlag, Jena. 876 pp.

Krammer, K. and Lange-Bertalot, H. (2004). Bacillariophyceae 4. Teil: Achnanthaceae, Kritische Erganzungen zu Navicula (Lineolatae), Gomphonema Gesamtliteraturverzeichnis Teil 1-4 [second revised edition]. In: H. Ettl et al., Suesswasserflora von Mitteleuropa. Spektrum Akademischer Verlad Heidelberg, 468 pp.

Lange-Bertalot, H. (1993). 85 Neue taxa und uber 100 weitere neu definierte Taxa erganzend zur Subwasserflora von Mittleuropa. Bibliotheca Diatomologica 27, 454 p. Cramer, Berlin, Stuttgart.

Lange-Bertalot, H. (2001). Navicula sensu stricto, 10 genera separated from Navicula sensu lato, Frustulia. Diatoms of Europe 2: 1-526.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Navicula wildii CAS

North American Diatom Ecological Database (NADED)

NADED ID: 46660

Autecology Discussion

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).

Images

Governor Pond and Grinnell Point, Swiftcurrent Valley, Glacier National Park, Montana. Governor Pond is home to Navicula wildii.

Credit/Source: Loren Bahls

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

Credit/Source: Montana Diatom Database

Habits

Size Range

1001-10,000 µm3 (ie Diatoma vulgaris)

Motility

moderately motile (e.g. Navicula tripunctata)

Attachment

unattached

Habitat

benthic

Colony

solitary

EMAP Assessment

Sampling for the Environmental Protection Agency (EPA) western Environmental Monitoring and Assessment Program (EMAP) study was completed during the years 2000-2004 (see citations at bottom of this page). Streams and rivers in 12 western states (Arizona, California, Colorado, Idaho, Montana, Nevada, North Dakota, Oregon, South Dakota, Utah, Washington and Wyoming). Over 1200 sites on streams and rivers in 12 western states (Arizona, California, Colorado, Idaho, Montana, Nevada, North Dakota, Oregon, South Dakota, Utah, Washington and Wyoming) were selected for sampling based on a stratified randomized design. This type of design insures that ecological resources are sampled in proportion to their actual geographical presence. Stratified randomized design also allows for estimates of stream length with a known confidence in several “condition classes” (good or least-disturbed, intermediately-disturbed, and poor or most-disturbed) for biotic condition, chemistry and habitat.

EMAP Distribution

Navicula wildii

Distribution

The distribution map represents the relative abundance of this Navicula wildii in the western EMAP study. Relative abundance is a measure of the proportion of cells of this species based on a "fixed count" of 300 total diatom cells counted and identified. Each of the western EMAP sample sites is shown, either with a black dot for sites where Navicula wildii was not recorded, or with a red circle indicating the relative abundance of Navicula wildii.

Note that the size of the proportional symbols varies between species to help show both abundant and rare species.

Scale for the map to the left

EMAP Response Plots

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.

EMAP citations

Results are published in:

Johnson, T., Hermann, K., Spaulding, S., Beyea, B., Theel, C., Sada, R., Bollman, W., Bowman, J., Larsen, A., Vining, K., Ostermiller, J., Petersen, D. Hargett, E. and Zumberge, J. (2009). An ecological assessment of USEPA Region 8 streams and rivers. U.S. Environmental Protection Agency Region 8 Report, 178 p.

Stoddard, J. L., Peck, D. V., Olsen, A. R., Larsen, D. P., Van Sickle, J., Hawkins, C. P., Hughes, R. M., Whittier, T. R., Lomnicky, G. A., Herlihy, A. T., Kaufman, P. R., Peterson, S. A., Ringold, P. L., Paulsen, S. G., and Blair, R. (2005). Environmental Monitoring and Assessment Program (EMAP) western streams and rivers statistical summary. U.S. Environmental Protection Agency Report 620/R-05/006, 1,762 p.

Stoddard, J. L., Peck, D. V., Paulsen, S. G., Van Sickle, J., Hawkins, C. P., Herlihy, A. T., Hughes, R. M., Kaufman, P. R., Larsen, D. P., Lomnicky, G. A., Olsen, A. R., Peterson, S. A., Ringold, P. L., and Whittier, T. R. (2005). An ecological assessment of western streams and rivers. U.S. Environmental Protection Agency Report 620/R-05/005, 49 p.