The effects of diltiazem on growth, reproduction, energy reserves, and calcium-dependent physiology in Daphnia magna.

Autor: Steinkey D; Dept. of Biological Sciences, University of Lethbridge, Lethbridge, AB, T1K 3M4, Canada., Lari E; Dept. of Biological Sciences, University of Lethbridge, Lethbridge, AB, T1K 3M4, Canada; Department of Cell & Systems Biology, 25 Harbord Street, University of Toronto, Toronto, ON M5S 3G5, Canada., Woodman SG; Dept. of Biological Sciences, University of Lethbridge, Lethbridge, AB, T1K 3M4, Canada., Steinkey R; Dept. of Biological Sciences, University of Lethbridge, Lethbridge, AB, T1K 3M4, Canada., Luong KH; Richardson College for the Environment, University of Winnipeg, Winnipeg, MB, R3B 2E9, Canada., Wong CS; Richardson College for the Environment, University of Winnipeg, Winnipeg, MB, R3B 2E9, Canada., Pyle GG; Dept. of Biological Sciences, University of Lethbridge, Lethbridge, AB, T1K 3M4, Canada. Electronic address: gregory.pyle@uleth.ca.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2019 Oct; Vol. 232, pp. 424-429. Date of Electronic Publication: 2019 May 23.
DOI: 10.1016/j.chemosphere.2019.05.176
Abstrakt: With the growth of both the pharmaceutical industry and the human population and longevity, more drugs are used and processed each day. Inevitably, these pharmaceuticals enter wastewater through human excretion and improper disposal of leftovers. One such medication, diltiazem, a calcium channel blocker, is of importance due to its widespread consumption, and prevalence in aquatic environments. To study the sub-lethal effects of diltiazem on aquatic animals, we investigated its impacts no feeding behaviour, heart rate, respiration, growth, and reproduction of a bioindicator species, Daphnia magna. When exposed to environmentally relevant concentrations, D. magna increased their heart rate by 12% and oxygen consumption by 48%. However, exposure did not have any effects on thoracic limb movement frequency or peristalsis (i.e. feeding behaviour). Individuals exposed to diltiazem for a longer duration (16 days) showed a 44% decrease in lipid reserves and produced between 17 and 28% fewer neonates which were 10-12% larger. Our study demonstrated that exposure to diltiazem creates an energy imbalance in D. magna which could, in the long run, influence their populations.
(Copyright © 2019 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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