Effects of Photosystem II-inhibiting herbicides on mangroves: preliminary toxicology trials

Bell, Alicia M., and Duke, Norman C. (2005) Effects of Photosystem II-inhibiting herbicides on mangroves: preliminary toxicology trials. Marine Pollution Bulletin, 51 (1-4). pp. 297-307.

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Abstract

Mangroves are sensitive to the root application of Photosystem-II inhibiting herbicides and Avicennia marina is more sensitive than other mangroves tested. Seedlings of four mangrove species, including two salt-excreting species (Avicennia marina and Aegiceras corniculatum) and two salt-excluding species (Rhizophora stylosa and Ceriops australis) were treated with a range of concentrations of the herbicides diuron, ametryn and atrazine. Assessment of responses required the separation of seedlings into two groups: those that had only their roots exposed to the herbicides through the water (Avicennia marina and Rhizophora stylosa) and those that had both roots and leaves exposed to herbicides through the water (Aegiceras corniculatum and Ceriops australis). Salt-excreting species in each group were more susceptible to all herbicide treatments than salt-excluding species, indicating that root physiology is a major factor in the uptake of toxic pollutants in mangroves. Submergence of leaves may facilitate herbicide uptake, having serious implications for seedling recruitment in the field. Each herbicide was ranked by its toxicity to the seedlings from most effective to least effective, with diuron>ametryn>atrazine. These preliminary trials support the idea that herbicides, particularly diuron, have contributed to the serious dieback of Avicennia marina in the Mackay region.

Item ID: 34945
Item Type: Article (Research - C1)
ISSN: 1879-3363
Keywords: mangrove; plants; Avicennia; Rhizophora; Aegiceras; Ceriops; physiology; salinity; herbicides; diuron; effects; planthouse; trials; experiments; seedlings; Queensland; Australia; IWP
Funders: Queensland Department of Primary Industries and Fisheries
Date Deposited: 11 Nov 2014 02:39
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050204 Environmental Impact Assessment @ 30%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 50%
05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050206 Environmental Monitoring @ 20%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 30%
96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960503 Ecosystem Assessment and Management of Coastal and Estuarine Environments @ 40%
96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961102 Physical and Chemical Conditions of Water in Coastal and Estuarine Environments @ 30%
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