Document of bibliographic reference 348288

BibliographicReference record

Type

Bibliographic resource

Type of document

Journal article

BibLvlCode

AS

Title

Changes in the colour and photosynthetic efficiency of the hermatypic coral Acropora tenuis exposed to Irgarol 1051 at 30 °C seawater temperature

Abstract

Besides global warming, coral reefs face various anthropogenic threats, including watershed-based and marine-based contaminants. Recently, Irgarol 1051, a photosystem II herbicide, has been introduced as a “booster” agent in copper-based antifouling paints after global ban of tributyltin (TBT) in January 2008. Irgarol is considered to pose a potential risk to corals. In this study, a clone of Acropora tenuis separated from the colony collected from Sesoko Island, Okinawa, southern Japan, was exposed to 1.0 μg L⁻¹ Irgarol at 27.5 °C and 30.0 °C (higher than the temperature in the warmest month in southern Japan) for 7 d. The coral colour was converted to RGB values, ranging from 0 (darkest) to 255 (brightest). The RGB values under both temperature treatments slightly decreased in the control (no herbicide exposure), but those in both 27.5 °C and 30.0 °C Irgarol treatments increased after day 3. The maximum effective quantum yield (ΔF/Fm′) slightly increased in both 27.5 °C and 30.0 °C control treatments, but decreased in 27.5 °C and 30.0 °C Irgarol treatments after day 1. The exposure to 1.0 μg L⁻¹ Irgarol induced significant differences in RGB values and ΔF/Fm′ compared with those in the control at the same temperature. Regarding the temperature difference (27.5 °C vs. 30.0 °C), no significant differences in RGB values and ΔF/Fm′ were detected in both control and Irgarol treatments. Our results revealed no significant combined effect of Irgarol exposure and 30.0 °C on A. tenuis. These findings suggest that 30.0 °C is a normally inhabitable environmental temperature for A. tenuis. The bleaching of A. tenuis is more likely caused by the exposure to 1.0 μg L⁻¹ Irgarol than by the exposure to high seawater temperature of 30.0 °C.

WebOfScience code

https://www.webofscience.com/wos/woscc/full-record/WOS:000697015300003

Bibliographic citation

Gushi, M.; Ishibashi, H.; Takayama, K.; Yamashiro, H.; Takeuchi, I. (2021). Changes in the colour and photosynthetic efficiency of the hermatypic coral Acropora tenuis exposed to Irgarol 1051 at 30 °C seawater temperature. Regional Studies in Marine Science 47: 101957. https://dx.doi.org/10.1016/j.rsma.2021.101957

Topic

Marine

Is peer reviewed

true