Abstract

BARRERA-HERRERA, July Andrea  and  ESPINOSA-RAMIREZ, Adriana Janneth. Ecotoxicological comparison to Sodium Chloride in Hydra vulgaris and Hydra viridissima. Rev. colomb. biotecnol [online]. 2023, vol.25, n.1, pp.4-14.  Epub Dec 06, 2023. ISSN 0123-3475.  https://doi.org/10.15446/rev.colomb.biote.v25n1.96258.

The increase in salinity in freshwater ecosystems raises concern about the adverse effects that it can cause in freshwater species and the soil. The sodium and calcium ions optimum concentrations required for genus Hydra to have adequate physiological conditions are relatively low. This research compared the H. vulgaris and H. viridissima sodium chloride (NaCl) sensitivity. The species were propagated under photoperiod, lighting and temperature-controlled conditions. The growth rates were obtained and EC50 (mean effective concentration) and LC50 (mean lethal concentration) were calculated by means of acute toxicity tests as indicators of sensitivity to NaCl. For H. vulgaris the LC50-96h was 1.0 g/l of NaCl with a range between 0.8 - 1.2 g/l of NaCl, compared to H. viridissima presented an average LC50-96h of 2.6 g/l of NaCl with a 95% confidence interval between 2.0 - 3.3 g/l of NaCl. The H. viridissima was more tolerant, probably the symbiotic relationship with Chlorella vulgaris, can generate a protective effect. Understanding the behavior of these species with respect to increased salinization can allow an early assessment of ecological risks in tropical aquatic ecosystems.

Keywords : Ecotoxicity; freshwater; hydrozoans; salinization; sensitivity.

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