Marine reserves shape seascapes on scales visible from space

Elizabeth M.P. Madin, Alastair R. Harborne, Aaron M.T. Harmer, Osmar J. Luiz, Trisha B. Atwood, Brian J. Sullivan, Joshua S. Madin

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    Marine reserves can effectively restore harvested populations, and 'megareserves' increasingly protect large tracts of ocean. However, no method exists of monitoring ecological responses at this large scale. Herbivory is a key mechanism structuring ecosystems, and this consumer-resource interaction's strength on coral reefs can indicate ecosystem health. We screened 1372, and measured features of 214, reefs throughout Australia's Great Barrier Reef using high-resolution satellite imagery, combined with remote underwater videography and assays on a subset, to quantify the prevalence, size and potential causes of 'grazing halos'. Halos are known to be seascapescale footprints of herbivory and other ecological interactions. Here we show that these halo-like footprints are more prevalent in reserves, particularly older ones (approx. 40 years old), resulting in predictable changes to reef habitat at scales visible from space. While the direct mechanisms for this pattern are relatively clear, the indirect mechanisms remain untested. By combining remote sensing and behavioural ecology, our findings demonstrate that reserves can shape large-scale habitat structure by altering herbivores' functional importance, suggesting that reserves may have greater value in restoring ecosystems than previously appreciated. Additionally, our results show that we can now detect macro-patterns in reef species interactions using freely available satellite imagery. Low-cost, ecosystem-level observation tools will be critical as reserves increase in number and scope; further investigation into whether halos may help seems warranted. Significance statement: Marine reserves are a widely used tool to mitigate fishing impacts on marine ecosystems. Predicting reserves' large-scale effects on habitat structure and ecosystem functioning is a major challenge, however, because these effects unfold over longer and larger scales than most ecological studies. We use a unique approach merging remote sensing and behavioural ecology to detect ecosystem change within reserves in Australia's vast Great Barrier Reef. We find evidence of changes in reefs' algal habitat structure occurring over large spatial (thousands of kilometres) and temporal (40+ years) scales, demonstrating that reserves can alter herbivory and habitat structure in predictable ways. This approach demonstrates that we can now detect aspects of reefs' ecological responses to protection even in remote and inaccessible reefs globally.

    Original languageEnglish
    Article number20190053
    Pages (from-to)1-11
    Number of pages11
    JournalProceedings of the Royal Society B: Biological Sciences
    Volume286
    Issue number1901
    DOIs
    Publication statusE-pub ahead of print - 24 Apr 2019

    Fingerprint

    Reefs
    marine park
    Ecosystem
    reefs
    reef
    habitat structure
    Ecosystems
    herbivores
    herbivory
    ecosystems
    ecosystem
    habitats
    Herbivory
    behavioral ecology
    Great Barrier Reef
    barrier reef
    footprint
    satellite imagery
    remote sensing
    Satellite imagery

    Cite this

    Madin, E. M. P., Harborne, A. R., Harmer, A. M. T., Luiz, O. J., Atwood, T. B., Sullivan, B. J., & Madin, J. S. (2019). Marine reserves shape seascapes on scales visible from space. Proceedings of the Royal Society B: Biological Sciences, 286(1901), 1-11. [20190053]. https://doi.org/10.1098/rspb.2019.0053
    Madin, Elizabeth M.P. ; Harborne, Alastair R. ; Harmer, Aaron M.T. ; Luiz, Osmar J. ; Atwood, Trisha B. ; Sullivan, Brian J. ; Madin, Joshua S. / Marine reserves shape seascapes on scales visible from space. In: Proceedings of the Royal Society B: Biological Sciences. 2019 ; Vol. 286, No. 1901. pp. 1-11.
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    abstract = "Marine reserves can effectively restore harvested populations, and 'megareserves' increasingly protect large tracts of ocean. However, no method exists of monitoring ecological responses at this large scale. Herbivory is a key mechanism structuring ecosystems, and this consumer-resource interaction's strength on coral reefs can indicate ecosystem health. We screened 1372, and measured features of 214, reefs throughout Australia's Great Barrier Reef using high-resolution satellite imagery, combined with remote underwater videography and assays on a subset, to quantify the prevalence, size and potential causes of 'grazing halos'. Halos are known to be seascapescale footprints of herbivory and other ecological interactions. Here we show that these halo-like footprints are more prevalent in reserves, particularly older ones (approx. 40 years old), resulting in predictable changes to reef habitat at scales visible from space. While the direct mechanisms for this pattern are relatively clear, the indirect mechanisms remain untested. By combining remote sensing and behavioural ecology, our findings demonstrate that reserves can shape large-scale habitat structure by altering herbivores' functional importance, suggesting that reserves may have greater value in restoring ecosystems than previously appreciated. Additionally, our results show that we can now detect macro-patterns in reef species interactions using freely available satellite imagery. Low-cost, ecosystem-level observation tools will be critical as reserves increase in number and scope; further investigation into whether halos may help seems warranted. Significance statement: Marine reserves are a widely used tool to mitigate fishing impacts on marine ecosystems. Predicting reserves' large-scale effects on habitat structure and ecosystem functioning is a major challenge, however, because these effects unfold over longer and larger scales than most ecological studies. We use a unique approach merging remote sensing and behavioural ecology to detect ecosystem change within reserves in Australia's vast Great Barrier Reef. We find evidence of changes in reefs' algal habitat structure occurring over large spatial (thousands of kilometres) and temporal (40+ years) scales, demonstrating that reserves can alter herbivory and habitat structure in predictable ways. This approach demonstrates that we can now detect aspects of reefs' ecological responses to protection even in remote and inaccessible reefs globally.",
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    Madin, EMP, Harborne, AR, Harmer, AMT, Luiz, OJ, Atwood, TB, Sullivan, BJ & Madin, JS 2019, 'Marine reserves shape seascapes on scales visible from space', Proceedings of the Royal Society B: Biological Sciences, vol. 286, no. 1901, 20190053, pp. 1-11. https://doi.org/10.1098/rspb.2019.0053

    Marine reserves shape seascapes on scales visible from space. / Madin, Elizabeth M.P.; Harborne, Alastair R.; Harmer, Aaron M.T.; Luiz, Osmar J.; Atwood, Trisha B.; Sullivan, Brian J.; Madin, Joshua S.

    In: Proceedings of the Royal Society B: Biological Sciences, Vol. 286, No. 1901, 20190053, 24.04.2019, p. 1-11.

    Research output: Contribution to journalArticleResearchpeer-review

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    AU - Harborne, Alastair R.

    AU - Harmer, Aaron M.T.

    AU - Luiz, Osmar J.

    AU - Atwood, Trisha B.

    AU - Sullivan, Brian J.

    AU - Madin, Joshua S.

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    Madin EMP, Harborne AR, Harmer AMT, Luiz OJ, Atwood TB, Sullivan BJ et al. Marine reserves shape seascapes on scales visible from space. Proceedings of the Royal Society B: Biological Sciences. 2019 Apr 24;286(1901):1-11. 20190053. https://doi.org/10.1098/rspb.2019.0053