The sea cucumbers are common members of marine benthic communities, widespread distributed, easily available and handled. Nevertheless, no data are available on embryo toxicity assays using sea cucumbers, despite some of these species could fully meet the requirements for model test organisms. Holothuria polii is a key species in soft sediments and seagrass meadows; the aim of the present study was the standardization of a new embryo bioassay with this species, as an ecologically relevant test to evaluate the effects of environmental stressors. Sequential experiments were carried out, allowing to define the test acceptability, and a minimum sample size of 240 embryos. Temperature of 26 degrees C, salinity at 36 parts per thousand and a density of 60 eggs/ml were identified as optimum experimental conditions for performing the bioassay. The EC50 calculated for Cd2+ and Cu2+ in dose-response experiments indicated a good sensitivity of H. polii, with comparable values with those obtained in embryo toxicity bioassays of other marine invertebrates. An Integrative Toxicity Index (ITI) was calculated by integrating the frequency of abnormal embryos with the severity of observed abnormalities. The index allows to better discriminate different levels of toxicity, appearing particularly relevant for validating the usefulness of H. polii in embryo assays and ecotoxicological studies on environmental quality. (C) 2019 Published by Elsevier Ltd.

Morroni, L., Rakaj, A., Grosso, L., Fianchini, A., Pellegrini, D., Regoli, F. (2020). Sea cucumber Holothuria polii (Delle Chiaje, 1823) as new model for embryo bioassays in ecotoxicological studies. CHEMOSPHERE, 240, 124819 [10.1016/j.chemosphere.2019.124819].

Sea cucumber Holothuria polii (Delle Chiaje, 1823) as new model for embryo bioassays in ecotoxicological studies

Rakaj, A.
Conceptualization
;
2020

Abstract

The sea cucumbers are common members of marine benthic communities, widespread distributed, easily available and handled. Nevertheless, no data are available on embryo toxicity assays using sea cucumbers, despite some of these species could fully meet the requirements for model test organisms. Holothuria polii is a key species in soft sediments and seagrass meadows; the aim of the present study was the standardization of a new embryo bioassay with this species, as an ecologically relevant test to evaluate the effects of environmental stressors. Sequential experiments were carried out, allowing to define the test acceptability, and a minimum sample size of 240 embryos. Temperature of 26 degrees C, salinity at 36 parts per thousand and a density of 60 eggs/ml were identified as optimum experimental conditions for performing the bioassay. The EC50 calculated for Cd2+ and Cu2+ in dose-response experiments indicated a good sensitivity of H. polii, with comparable values with those obtained in embryo toxicity bioassays of other marine invertebrates. An Integrative Toxicity Index (ITI) was calculated by integrating the frequency of abnormal embryos with the severity of observed abnormalities. The index allows to better discriminate different levels of toxicity, appearing particularly relevant for validating the usefulness of H. polii in embryo assays and ecotoxicological studies on environmental quality. (C) 2019 Published by Elsevier Ltd.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore BIO/07
English
Ecotoxicology
Embryo bioassay
Harbor sediments
Holothuria polii
Sea cucumber
Water quality
Animals
Biological Assay
Ecotoxicology
Sea Cucumbers
Morroni, L., Rakaj, A., Grosso, L., Fianchini, A., Pellegrini, D., Regoli, F. (2020). Sea cucumber Holothuria polii (Delle Chiaje, 1823) as new model for embryo bioassays in ecotoxicological studies. CHEMOSPHERE, 240, 124819 [10.1016/j.chemosphere.2019.124819].
Morroni, L; Rakaj, A; Grosso, L; Fianchini, A; Pellegrini, D; Regoli, F
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/303478
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