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Interactive responses of primary producers and grazers to pollution on temperate rocky reefs

Citation

Fowles, AE and Stuart-Smith, RD and Hill, NA and Thomson, RJ and Strain, EMA and Alexander, TJ and Kirkpatrick, J and Edgar, GJ, Interactive responses of primary producers and grazers to pollution on temperate rocky reefs, Environmental Pollution, 237 pp. 388-395. ISSN 0269-7491 (2018) [Refereed Article]

Copyright Statement

Copyright 2018 Elsevier Ltd.

DOI: doi:10.1016/j.envpol.2018.02.061

Abstract

Macroalgal beds provide important habitat structure and support primary production for rocky reef communities, but are increasingly degraded as a result of human pressures. Various sources of pollution can have both direct and interactive effects on stressed ecosystems. In particular, interactions involving invertebrate grazers could potentially weaken or strengthen the overall impact of pollution on macroalgal beds. Using a paired impact-control experimental design, we tested the effects of multiple pollution sources (fish farms, marinas, sewerage, and stormwater) on translocated and locally established algal assemblages, while also considering the influence of invertebrate grazers. Marinas directly affected algal assemblages and also reduced densities of amphipods and other invertebrate mesograzers. Fish farms and sewerage outfalls tended to directly increase local establishment of foliose and leathery algae without any indication of changes in herbivory. Overall, pollution impacts on algae did not appear to be strongly mediated by changes in grazer abundance. Instead, mesograzer abundance was closely linked to availability of more complex algal forms, with populations likely to decline concurrently with loss of complex algal habitats. Macrograzers, such as sea urchins, showed no signs of a negative impact from any pollution source; hence, the influence of this group on algal dynamics is probably persistent and independent of moderate pollution levels, potentially adding to the direct impacts of pollution on algal beds in urbanised environments.

Item Details

Item Type:Refereed Article
Keywords:pollution, field experiment, Hobart, marinas, fish farms, epifauna, herbivory, aquaculture, kelp, invertebrates
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Marine Flora, Fauna and Biodiversity
UTAS Author:Fowles, AE (Ms Amelia Fowles)
UTAS Author:Stuart-Smith, RD (Dr Rick Stuart-Smith)
UTAS Author:Hill, NA (Dr Nicole Hill)
UTAS Author:Strain, EMA (Dr Beth Strain)
UTAS Author:Kirkpatrick, J (Professor James Kirkpatrick)
UTAS Author:Edgar, GJ (Professor Graham Edgar)
ID Code:124882
Year Published:2018
Web of Science® Times Cited:2
Deposited By:Ecology and Biodiversity
Deposited On:2018-03-16
Last Modified:2018-11-14
Downloads:0

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