Effects of oils and dispersed-oils on mangrove seedlings in planthouse experiments: a preliminary assessment of results two months after oil treatments

Duke, N.C., Burns, K.A., and Dalhaus, O. (1998) Effects of oils and dispersed-oils on mangrove seedlings in planthouse experiments: a preliminary assessment of results two months after oil treatments. APPEA Journal, 38 (2). pp. 631-636.

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Abstract

The effects of oil and dispersed-oil treatments on mangrove seedlings, grown in artificial tidal systems in tropical north-eastern Australia, were assessed two months after application. Seedling mortality was used as a measure of treatment toxicity. All oils and dispersed-oils were toxic to mangrove seedlings although the effect of Bunker C was quite low. Overall, oils and dispersed-oils were ordered by increasing toxicity: Bunker C fuel, Arabian Light crude, Gippsland Light crude, Thevenard crude, and Woodside condensate. Toxicity of oils correlated with viscosity, where low toxicity of the heavy fuel oil (3% mortality) stood in marked contrast with high levels of mortality scored for very light crude oils, Thevenard (73%) and Woodside (85%). Mangrove species were ordered by their overall increased vulnerability to oils and dispersed-oils as, Ceriops spp., Rhizophora stylosa, Avicennia marina and Aegiceras corniculatum. As expected, higher doses (2.0 L/m2) showed an overall increase of 30% mortality compared with lower doses (0.2 L/m2). However, values for each grouping of seedlings varied widely, indicating possible synergistic effects of different environmental factors. Despite this, at least one other pattern was evident. Dispersed-oil treatments were usually less toxic to mangrove seedlings than undispersed oils, particularly for high doses. This result needs to be further assessed, but it is of interest that added dispersant did not usually result in increased seedling mortality. We will re-evaluate all findings once the trials are completed.

Item ID: 48908
Item Type: Article (Refereed Research - C1)
Keywords: mangrove; plants; seedlings; pollution; oil; hydrocarbon; experimental; laboratory; planthouse; Australia; IWP
ISSN: 1326-4966
Funders: Australian Petroleum Production and Exploration Association (APPEA), Energy Research and Development Corporation (ERDC)
Date Deposited: 11 May 2017 22:48
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050205 Environmental Management @ 30%
05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050204 Environmental Impact Assessment @ 40%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 30%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 30%
96 ENVIRONMENT > 9612 Rehabilitation of Degraded Environments > 961201 Rehabilitation of Degraded Coastal and Estuarine Environments @ 40%
96 ENVIRONMENT > 9606 Environmental and Natural Resource Evaluation > 960609 Sustainability Indicators @ 30%
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