Manganese uptake and partitioning between the tissue of the anemone host Exaiptasia pallida and Symbiodinium spp., including assessment of stress and recovery

Iyagbaye, Louis; Reichelt‐Brushett, Amanda; Benkendorff, Kirsten

doi:10.1016/j.chemosphere.2022.133895

Cited by 5 publications

(3 citation statements)

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“…The anemone Exaiptasia pallida survived after a 12‐day exposure to 54 000 µg dissolved Mn/L (Summer et al, 2019), and up to 87 000 µg dissolved Mn/L following 24 days exposure; however, stress responses of tentacle retraction were observed at concentrations as low as 460 µg dissolved Mn/L (Iyagbaye et al, 2022). Iyagbaye et al (2022) also showed that Symbiodinium spp. played a role in Mn uptake and depuration from E. pallida .…”

Section: Discussionmentioning

confidence: 99%

“…Although limited to just two studies, there is some evidence to suggest that closely related noncalcifying cnidarians appear to be less sensitive to Mn than scleractinian corals. The anemone Exaiptasia pallida survived after a 12‐day exposure to 54 000 µg dissolved Mn/L (Summer et al, 2019), and up to 87 000 µg dissolved Mn/L following 24 days exposure; however, stress responses of tentacle retraction were observed at concentrations as low as 460 µg dissolved Mn/L (Iyagbaye et al, 2022). Iyagbaye et al (2022) also showed that Symbiodinium spp.…”

Section: Discussionmentioning

confidence: 99%

“…Corals are classified as cnidarians, a phylum that is one of the most abundant and diverse in tropical marine waters, also including anemones, jellyfish, and hydroids, among other taxa (WoRMs, 2022). Recent studies with cnidarians suggest that adult scleractinan corals are particularly sensitive to Mn (median effect concentrations [EC50s] of 700–860 µg/L, based on dissolved and nominal datasets), even when compared with early life stages of corals (EC50s of 7000–237 000 µg/L, dissolved) and with another cnidarian species (EC50 of 164 000 µg/L, dissolved; Iyagbaye et al, 2022; Stauber et al, 2002; Summer et al, 2019). Reported 48‐h EC50 values of 700 µg nominal Mn/L ( Acropora spathulata ) and 860 µg dissolved Mn/L ( Stylophora pistillata ) in static renewal experimental systems suggest that some coral species are sensitive to environmentally relevant Mn concentrations (Stauber et al, 2002; Summer et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Adult Corals Are Uniquely More Sensitive to Manganese Than Coral Early-Life Stages

Binet

Reichelt‐Brushett

McKnight

et al. 2023

Environmental Toxicology and Chemistry

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Manganese (Mn) is an essential element and is generally considered to be one of the least toxic metals to aquatic organisms, with chronic effects rarely seen at concentrations below 1000 µg/L. Anthropogenic activities lead to elevated concentrations of Mn in tropical marine waters. Limited data suggest that Mn is more acutely toxic to adults than to early life stages of scleractinian corals in static renewal tests. However, to enable the inclusion of sufficient sensitive coral data in species sensitivity distributions to derive water quality guideline values for Mn, we determined the acute toxicity of Mn to the adult scleractinian coral, Acropora muricata, in flow‐through exposures. The 48‐h median effective concentration was 824 µg Mn/L (based on time‐weighted average, measured, dissolved Mn). The endpoint was tissue sloughing, a lethal process by which coral tissue detaches from the coral skeleton. Tissue sloughing was unrelated to superoxidase dismutase activity in coral tissue, and occurred in the absence of bleaching, that is, toxic effects were observed for the coral host, but not for algal symbionts. We confirm that adult scleractinian corals are uniquely sensitive to Mn in acute exposures at concentrations 10–340 times lower than those reported to cause acute or chronic toxicity to coral early life stages, challenging the traditional notion that early life stages are more sensitive than mature organisms. Environ Toxicol Chem 2023;42:1359–1370. © 2023 Commonwealth Scientific and Industrial Research Organisation. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC.

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Section: Discussionmentioning

confidence: 99%