Karayevia ploenensis var. gessneri | Species

Category

Monoraphid
Length Range

11-16 µm
Width Range

4.8-5.6 µm
Striae in 10 µm

14-16 in the center of raphe valve, 15-17 in the center of raphe valve, up to 20 at the ends

Synonyms

Achnanthes ploenensis var. gessneri (Hust.) Lange-Bert. in Lange-Bert. and Krammer

Contributor

Marina Potapova - May 2010
Reviewer

Rex Lowe - Nov 2011

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Identification

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Description

Valves are elliptic-lanceolate, with subrostrate to rostrate apices. Both raphe and rapheless valves have a narrow lanceolate axial area and lack a distinct central area. The raphe is straight. Striae on the raphe valve are strongly radiate, becoming parallel to slightly convergent toward the apices. The striae on the rapheless valve are slightly radiate, becoming parallel to slightly convergent toward the apices. The striae on the rapheless valve are interrupted by a marginal longitudinal line on each side of the valve.

Autecology

Size Range, µm3

11-100 101-1000
Motility

Slightly motile
Attachment

Unattached
Habitat

Benthic
Colony

Solitary
Waterbody

Inland
Distribution

Northeast lake sediments
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Original Description

Valvae elliptico-lanceolatae apicibus obtuse rostratis, 14-17 µ latae. Rhaphovalva rhaphe directa poris centralibus approximatis, area axiali anguste lanceolata, striis transapicalibus radiantibus in media parte circiter 16 in 10 µ, ad apices versus paulo densioribus, usque ad 20 in 10 µ. Areovalva area axiali anguste lanceolata, striis transapicalibus in media parte lenissime radiantibus vel ad lineam mediam perpendicularibus, 16-20 in 10 µ, ad apices versus magis radiantibus et paulo densioribus, prope marginem costa longitudinali decussatis. Fig. 14-19.

Basionym

Achnanthes gessneri
Author

Hust. 1953
Length Range

14-17 µm
Width

5-6 µm
Striae in 10µm

16 in the center of raphe valve

Original Images

Citations & Links

Citations

Cite This Page

Potapova, M. (2010). Karayevia ploenensis var. gessneri. In Diatoms of North America. Retrieved December 26, 2024, from https://diatoms.org/species/44605/karayevia_ploenensis

Responses

The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Karayevia ploenensis var. gessneri 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.