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

Fowles, AE, Stuart-Smith, RD ORCID: 0000-0002-8874-0083, Hill, NA ORCID: 0000-0001-9329-6717, Thompson, RJ, Strain, EMA, Alexander, TJ, Kirkpatrick, JB ORCID: 0000-0002-3152-3299 and Edgar, GJ ORCID: 0000-0003-0833-9001 2018 , 'Interactive responses of primary producers and grazers to pollution on temperate rocky reefs' , Environmental Pollution, vol. 237 , pp. 388-395 , doi: 10.1016/j.envpol.2018.02.061.

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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 Type: Article
Authors/Creators:Fowles, AE and Stuart-Smith, RD and Hill, NA and Thompson, RJ and Strain, EMA and Alexander, TJ and Kirkpatrick, JB and Edgar, GJ
Keywords: pollution, field experiment, Hobart, marinas, fish farms, epifauna, herbivory, aquaculture, kelp, invertebrates
Journal or Publication Title: Environmental Pollution
Publisher: Elsevier Sci Ltd
ISSN: 0269-7491
DOI / ID Number: 10.1016/j.envpol.2018.02.061
Copyright Information:

Copyright 2018 Elsevier Ltd.

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