Photosystem II herbicide pollution in Hong Kong and its potential photosynthetic effects on corals |
| |
| Institution: | 1. College of Resources and Environment, Anhui Agricultural University, Key Laboratory of Agri-food Safety of Anhui Province, Hefei 230036, PR China;2. Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, 1955 East–West Road, Honolulu, HI 957822, USA;1. Marine Ecology Research Centre, School of Environment Science and Engineering, Southern Cross University, PO Box 157, Lismore, NSW 2480, Australia;2. Centre for Coastal Biogeochemistry Research, School of Environment Science and Engineering, Southern Cross University, PO Box 157, Lismore, NSW 2480, Australia |
| |
| Abstract: | Photosystem II (PSII) herbicides have been shown to affect the photosynthesis of corals at low, environmentally relevant concentrations. The recent detection of the PSII herbicide Irgarol-1051 in coastal waters of Hong Kong at concentrations above the EC50 for reduction of photosynthesis of corals prompted further investigation into the extent of PSII herbicide pollution in coral reefs of Hong Kong. Snap-shot and passive samples were taken from coral reef sites and evaluated via HPLC/MS–MS and a novel bioanalytical technique. Low concentrations (less than 10 ng L?1) of diuron and atrazine were found at all study sites. Extracts from these samples concentrated by a factor of 10 were found to reduce the photosynthetic yield of zooxanthellae. It appears unlikely that herbicide pollution is a key issue in isolation but may act synergistically with other stressors to reduce the viability of Hong Kong’s coral reefs. The study has also demonstrated the feasibility of combining sample extraction techniques with a coral specific bioanalytical technique for a sensitive assessment of risks associated with herbicide exposure in corals. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
