Synedra mazamaensis | Species - Diatoms of North America

Category

Araphid
Length Range

12–38 µm
Width Range

3–5 µm
Striae in 10 µm

19-23

Synonyms

Fragilaria mazamaensis (Sovereign) Lange-Bert.

Contributor

Marina Potapova - May 2009
Reviewer

Sarah Spaulding - May 2010

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Identification

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Description

Valves are lanceolate with attenuate and capitate ends, slightly swollen in the middle portion, width 3-5 µm, length 12-38 µm. Striae number 19-23 in 10 µm. The external openings of the areolae are apically elongated. Axial area is linear and very narrow. The central area is asymmetrical about the apical median plane, and ghost striae may be present in some specimens. One rimportula is present at a valve apex. Apical pore fields are present at both apices. The pores within the apical porefields are arranged in parallel rows.

Autecology

Freshwater

Size Range, µm3

1001-10000
Motility

Non-motile
Attachment

Prostrate
Habitat

Benthic
BCG

BCG 2
Waterbody

Inland
Distribution

Western rivers 2004 California coastal rivers 2017
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Original Description

Valvae lanceolatae apicibus attenuatis, capitatis, 13-40 µ longae, 3-5 µ latae. Costa media longitudinalis (pseudoraphe) angustissima, area axialis nulla, area centralis unilateralis. Striae transapicales 19-23 in 10 µ, lenissime radiantes.

Author

Sovereign 1958
Length Range

13-40 µm
Width

3-5 µm
Striae in 10µm

19-23

Original Images

Original text and images reproduced with permission by Blackwell Publishing.

Citations & Links

Citations

Sovereign, H.E. (1958) The diatoms of Crater Lake, Oregon Transactions of the American Microscopical Society 77(2):96-134.

Cite This Page

Potapova, M. (2009). Synedra mazamaensis. In Diatoms of North America. Retrieved December 12, 2024, from https://diatoms.org/species/44572/synedra_mazamaensis

Responses

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