Craticula acidoclinata | Species - Diatoms of North America

Category

Symmetric Biraphid
Length Range

94-168 µm
Width Range

22-29 µm
Striae in 10 µm

12-14

Contributor

Loren Bahls - Jun 2012
Reviewer

Steve Main - Jun 2012

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Identification

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Description

Valves are lanceolate with weakly protracted (subrostrate) and broadly rounded apices. The axial area is narrow and widens gradually into the central area, which is longitudinally elongate with convex sides. The raphe is weakly lateral with proximal ends that are moderately distant, somewhat inflated and hooked to the same side. Striae are weakly radiate but convergent very near the apices. Areolae are easily distinguished in LM and number 23-24 in 10 µm. Craticula are present in some specimens.

Autecology

Craticula acidoclinata is uncommon in small ponds and pools in the Northern Rockies. The Montana population pictured here was found in a small pond in a conifer forest at 2,000 m elevation along the Continental Divide near Helena. The pH of this pond measured 6.98 and specific conductance measured 46 µS/cm. These low pH and specific conductance values distinguish this species ecologically from Craticula cuspidata, which prefers more alkaline water with higher electrolyte content. Craticula acidoclinata was described from an oligo-dystrophic lake in Finland with a pH of 6.5 and a specific conductance of 17 µS/cm.

Size Range, µm3

10001-100000
Motility

Moderately motile
Attachment

Unattached
Habitat

Benthic
Colony

Solitary
Waterbody

Inland
Distribution

Northeast lake sediments
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Original Description

Author

Lange-Bert. and Metzeltin 1996
Length Range

60-110 µm
Width

16-23 µm
Striae in 10µm

13-15

Original Images

Citations & Links

Citations

Cite This Page

Bahls, L. (2012). Craticula acidoclinata. In Diatoms of North America. Retrieved December 21, 2024, from https://diatoms.org/species/48516/craticula_acidoclinata

Responses

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