Determining The Suitability Of
Ceriodaphnia Rigaudii As A Toxicity
Test Species
Author(s)
A. Mohammed
Abstract
The selection criteria for toxicity test species though well documented, does not
provide a clear approach for establishing the suitability of a species for toxicity
testing. This study looks at an approach used for establishing C. rigaudii as a
suitable freshwater toxicity test species for regulatory testing in Trinidad and
Tobago. A comparison was made between the life cycle, toxicological responses
and sensitivity of C. rigaudii and D. magna. The results showed that C. rigaudii
(0.45mm) was significantly smaller in size, had a shorter life cycle, matured
faster and was more sensitive to toxicants than the temperate cladoceran species,
D. magna. This study was useful in defining a stepwise approach to help
establish C. rigaudii as an indigenous tropical toxicity test species in Trinidad.
Keywords: ceriodaphnia rigaudii, cladoceran, Trinidad, interspecies
correlation, species selection, toxicity test.
1 Introduction
Toxicity tests generally follow standard protocols developed for both aquatic and
terrestrial organisms. These tests are often standardized with respect to species
selection, pre-test maintenance/care of organisms, age of test organisms, food,
duration, ambient light conditions, temperature, and end-points. Standardised test
protocols [1–4], are commonly used by various environmental protection
agencies (U.S. Environmental Protection Agency, Environment Canada and
Environmental Management Authority in Trinidad), forming an integral part of
their environmental monitoring programs.
The choice of test organism has a major influence on the relevance, success,
and interpretation of toxicity tests. No one organism may be suited for all
Keywords
ceriodaphnia rigaudii, cladoceran, Trinidad, interspecies
correlation, species selection, toxicity test.
Related Book
Other papers in this volume
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