首页|Interactive effects of high seawater temperature and the PS II herbicide Irgarol 1051 on photosynthetic efficiency of one species of the Acropora tenuis [sensu lato] complex (Scleractinia: Acroporidae)
Interactive effects of high seawater temperature and the PS II herbicide Irgarol 1051 on photosynthetic efficiency of one species of the Acropora tenuis [sensu lato] complex (Scleractinia: Acroporidae)
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NETL
NSTL
Elsevier
Among herbicides, Irgarol 1051 causes the strongest inhibition of maximum effective quantum yield (dF/Fm ') in symbiotic dinoflagellates of corals. In this study, interactive effects of heat stress and Irgarol (1.0 mu g/L) were investigated using aquaculture-reared Acropora sp., a species in the Acropora tenuis [sensu lato] complex in southern Japan. Two 7-d experiments were conducted with 27.5 degrees C as the temperature control and 30.0 or 32.0 degrees C as heat stress treatments. Coral colour, evaluated by red-green-blue values, and dF/Fm ' of symbiotic dinoflagellates in coral were monitored daily. In the 27.5 and 30.0 degrees C treatments, coral colour remained stable throughout the experiment; whereas, corals began to whiten at 32.0 degrees C in both control and Irgarol treatments. dF/Fm ' decreased from day 1 in both Irgarol treatments under control (27.5 degrees C) and heat stress conditions (30.0 and 32.0 degrees C). In the control treatment, heat stress of 32.0 degrees C induced a decrease in dF/Fm ', but less than the decrease in dF/Fm ' during Irgarol exposure. dF/Fm ' did not decrease in the temperature control and 30.0 degrees C heat stress treatments. A significant interactive decrease in dF/Fm ' was observed on day 1 at both 30.0 and 32.0 degrees C. Thus, at 30.0 and 32.0 degrees C, heat stress was considered to accelerate the dF/Fm ' reduction at the early stage of Irgarol exposure in aquaculture-reared Acropora sp. Compared to our previous study, the present study suggests that the response of corals in the A. tenuis [sensu lato] complex to Irgarol exposure differs depending on the genetic differences, such as species level.
NETL
NSTL
Elsevier
