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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: well documented and well performed according to scientific standards

Data source

Reference
Reference Type:
publication
Title:
Inhibition of cellular events during early algal gametophyte development: effects of select metals and an aqueous petroleum waste
Author:
Garman GD, Pillai MC, Cherr GN
Year:
1994
Bibliographic source:
Aquatic Toxicology 28, 127-144

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
long-term saltwater toxicity test of macroalgae
GLP compliance:
not specified

Test material

Reference
Name:
Unnamed
Type:
Constituent

Sampling and analysis

Analytical monitoring:
yes

Test organisms

Test organisms (species):
other: Macrocystis pyrifera

Study design

Test type:
static
Water media type:
saltwater
Total exposure duration:
113 h

Test conditions

Test temperature:
15 °C
pH:
7.8
Salinity:
19 parts per thousand
Nominal and measured concentrations:
Confirmation of test concentration: 93% to 106% of nominal As

Results and discussion

Effect concentrationsopen allclose all
Duration:
42 h
Dose descriptor:
NOEC
Effect conc.:
0.04 mg/L
Nominal / measured:
meas. (not specified)
Conc. based on:
dissolved
Basis for effect:
other: germination, germ tube growth, nuclear migration
Remarks on result:
other: NOEC=test concentration at which effect is not statistically different from control. In addition, based on LOEC of 0.08 mg/L causing < 20 % effect, NOEC=LOEC/2.
Duration:
42 h
Dose descriptor:
LOEC
Effect conc.:
0.08 mg/L
Nominal / measured:
meas. (not specified)
Conc. based on:
dissolved
Basis for effect:
other: germination, germ tube growth, nuclear migration
Remarks on result:
other: LOEC resulting in < 20 % effect.
Duration:
42 h
Dose descriptor:
EC50
Effect conc.:
> 0.09 - < 0.11 mg/L
Nominal / measured:
meas. (not specified)
Conc. based on:
dissolved
Basis for effect:
other: nuclear migration
Remarks on result:
other: Germination and germ tube growth were less sensitive.

Applicant's summary and conclusion

Conclusions:
A NOEC of 0.04 mg/L was reported for the marine macroalga Macrocystis pyrifera covering endpoints related to reproduction (germination, germ tube growth, nuclear migration). According to a graphical display of the test results, the EC50 is estimated to be in the range of 0.09 - 0.11 mg/L. The NOEC and the EC50 values are considered for the Chemical Safety Assessment.