Advantages and disadvantages of performing ecotoxicological bioassays with larvae of polychaetes belonging to the Capitella capitata species-complex.
DOI:
https://doi.org/10.37543/oceanides.v21i1-2.31Keywords:
Trochophores, Metatrochophores, metamorphosis, laboratory experimentsAbstract
The deposit feeder polychaete Capitella capitata contributes to the elimination of toxic substances from sediments. The taxon comprises a sibling species-complex that differs in their reproductive modes. It is known that larvae from this species-complex can delay or inhibit metamorphosis to the juvenile stage in the presence of toxic substances in the environment. The incorporation of these substances can delay the recruitment of individuals into natural populations. The advantages of performing bioassays to test effects on metamorphosis of C. capitata larvae are that these organisms are cosmopolitan, and are easy to collect, transport and culture without feeding. In addition, each brood can produce a high number of knownaged larvae, which are sensitive to different toxicants, especially when in solution. Nevertheless, the lack of knowledge about their life cycles and experimental protocols, the requirement of daily observations, the intraspecific individual variability, and their small body size and motility can difficult the experimental work. The use of C. capitata larvae to perform ecotoxicological studies in laboratory is recommended.
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