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Acute and chronic toxicity of manganese to tropical adult coral (Acropora millepora) to support the derivation of marine manganese water quality guideline values

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posted on 2023-11-17, 00:12 authored by LA Golding, MT Binet, MS Adams, J Hochen, CA Humphrey, GAV Price, AJ Reichelt-Brushett, M Salmon, Jenny StauberJenny Stauber
Adult corals are among the most sensitive marine organisms to dissolved manganese and experience tissue sloughing without bleaching (i.e., no loss of Symbiodinium spp.) but there are no chronic toxicity data for this sensitive endpoint. We exposed adult Acropora millepora to manganese in 2-d acute and 14-d chronic experiments using tissue sloughing as the toxicity endpoint. The acute tissue sloughing median effect concentration (EC50) was 2560 μg Mn/L. There was no chronic toxicity to A. millepora at concentrations up to and including the highest concentration of 1090 μg Mn/L i.e., the chronic no observed effect concentration (NOEC). A coral-specific acute-to-chronic ratio (ACR) (EC50/NOEC) of 2.3 was derived. These data were combined with chronic toxicity data for other marine organisms in a species sensitivity distribution (SSD). Marine manganese guidelines were 190, 300, 390 and 570 μg Mn/L to provide long-term protection of 99, 95, 90, and 80 % of marine species, respectively.

Funding

Funding for this research came from CSIRO and the Australian Government Department of Climate Change, Energy, the Environment and Water.

History

Publication Date

2023-09-01

Journal

Marine Pollution Bulletin

Volume

194

Issue

Pt B

Article Number

115242

Pagination

14p.

Publisher

Elsevier

ISSN

0025-326X

Rights Statement

/© 2023 Commonwealth Scientific and Industrial Research Organisation. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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