Increased extinction probability and altered physiological characteristics in pirimicarb-tolerant Daphnia magna.

Autor: Ishimota M; Laboratory of Residue Analysis II, Chemistry Division, The Institute of Environmental Toxicology, Joso-shi, Ibaraki, Japan. mota-4024will@hotmail.co.jp., Kodama M; Laboratory of Residue Analysis II, Chemistry Division, The Institute of Environmental Toxicology, Joso-shi, Ibaraki, Japan., Tomiyama N; Laboratory of Residue Analysis II, Chemistry Division, The Institute of Environmental Toxicology, Joso-shi, Ibaraki, Japan., Ohyama K; Laboratory of Residue Analysis II, Chemistry Division, The Institute of Environmental Toxicology, Joso-shi, Ibaraki, Japan.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2024 Jul; Vol. 31 (35), pp. 47690-47700. Date of Electronic Publication: 2024 Jul 13.
DOI: 10.1007/s11356-024-34386-4
Abstrakt: We evaluated the physiological characteristics of chemical-tolerant cladocerans. Over the course of 26 generations (F25), Daphnia magna was continuously exposed to pirimicarb (carbamate) solutions (0, 3.8, 7.5, and 15 µg/L) in sub-lethal or lethal levels. The 48 h EC 50 values (29.2-29.9 µg/L) for 7.5 and 15 µg/L exposure groups were found to be nearly two times higher than that in the control (17.2 µg/L). Subsequently, we investigated whether the extinction probability changed when the chemical-tolerant daphnids were fed two different types of food, Chlorella vulgaris and Synechococcus leopoliensis. Furthermore, we ascertained how chemical tolerance influences respiration and depuration rates. The 48 h EC 50 value was positively related to the extinction probability when the daphnids were fed S. leopoliensis. Because the measured lipid content of S. leopoliensis was three times lower than that of C. vulgaris, the tolerant daphnids struggled under nutrient-poor conditions. Respiration rates across all pirimicarb treatment groups were higher than those in the control group, suggesting that they may produce large amounts of energy through respiration to maintain the chemical tolerance. Since the pirimicarb depuration rate for 7.5 µg/L exposure groups was higher than that in the control, the altered metabolic/excretion rate may be one factor for acquiring chemical tolerance. These altered physiological characteristics are crucial parameters for evaluating the mechanisms of chemical tolerance and associated fitness costs.
(© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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