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High sedimentary oxygen consumption indicates that sewage input from small islands drives benthic community shifts on overfished reefs

Citation

Ford, AK and van Hoytema, N and Moore, BR and Pandihau, L and Wild, C and Ferse, SCA, High sedimentary oxygen consumption indicates that sewage input from small islands drives benthic community shifts on overfished reefs, Environmental Conservation pp. 1-7. ISSN 0376-8929 (2017) [Refereed Article]


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DOI: doi:10.1017/S0376892917000054

Abstract

Small-island coral reef ecosystems are usually closely coupled to the activities of human inhabitants. Ahus Island (Papua New Guinea) is an isolated Pacific island with a rapidly growing population, heavy reliance on marine resources and limited infrastructure. We hypothesized that untreated sewage was driving distinct benthic assemblages around Ahus and neighbouring uninhabited Onetah. At sites with varying proximities to beach toilets, fore-reef herbivorous fish biomass and benthic composition were measured alongside reef-flat sedimentary oxygen consumption (SOC); a high SOC rate reflects high organic input into coastal waters, thus serving as a potential indicator of sewage input. Fish biomass was low (17.120.1 g m2), but consistent between sites. However, cyanobacteria dominated the fore-reef closest to toilets (62 3%) with highest reef-flat SOC, whereas hard corals dominated furthest away (63 1%), where SOC was lowest. To our knowledge, this is the first study that used SOC to detect local differences in sewage pollution. The results indicate that whilst corals can maintain their dominance on overfished reefs, additional sewage stress may drive pronounced benthic shifts, highlighting the urgency to improve small-island waste management.

Item Details

Item Type:Refereed Article
Keywords:phase shifts, sewage, sedimentary oxygen consumption, herbivorous fish, cyanobacteria, waste management, small-island communities, coral reefs, overfishing
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Aquatic Ecosystem Studies and Stock Assessment
Objective Division:Environment
Objective Group:Ecosystem Assessment and Management
Objective Field:Ecosystem Assessment and Management of Coastal and Estuarine Environments
Author:Moore, BR (Mr Bradley Moore)
ID Code:121434
Year Published:2017
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2017-09-28
Last Modified:2017-10-03
Downloads:0

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