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A community and functional comparison of coral and reef fish assemblages between four decades of coastal urbanisation and thermal stress

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Cook, KM, Yamagiwa, H, Beger, M, Masucci, GD, Ross, S, Lee, HYT, Stuart-Smith, RD ORCID: 0000-0002-8874-0083 and Reimer, JD 2022 , 'A community and functional comparison of coral and reef fish assemblages between four decades of coastal urbanisation and thermal stress' , Ecology and Evolution, vol. 12, no. 3 , pp. 1-13 , doi: 10.1002/ece3.8736.

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Abstract

Urbanized coral reefs experience anthropogenic disturbances caused by coastal development, pollution, and nutrient runoff, resulting in turbid, marginal conditions in which only certain species can persist. Mortality effects are exacerbated by increasingly regular thermal stress events, leading to shifts towards novel communities dominated by habitat generalists and species with low structural complexity. There is limited data on the turnover processes that occur due to this convergence of anthropogenic stressors, and how novel urban ecosystems are structured both at the community and functional levels. As such, it is unclear how they will respond to future disturbance events. Here, we examine the patterns of coral reef community change and determine whether ecosystem functions provided by specialist species are lost post-disturbance. We present a comparison of community and functional trait-based changes for scleractinian coral genera and reef fish species assemblages subject to coastal development, coastal modification, and mass bleaching between two time periods, 19751976 and 2018, in Nakagusuku Bay, Okinawa, Japan. We observed an increase in fish habitat generalists, a dominance shift from branching to massive/sub-massive corals and increasing site-based coral genera richness between years. Fish and coral communities significantly reassembled, but functional trait-based multivariate space remained constant, indicating a turnover of species with similar traits. A compression of coral habitat occurred, with shallow (8 m) coral genera shifting towards the mid-depths (58 m). We show that although reef species assemblages altered post disturbance, new communities retained similar ecosystem functions. This result could be linked to the stressors experienced by urban reefs, which reflect those that will occur at an increasing frequency globally in the near future. Yet, even after shifts to disturbed communities, these fully functioning reef systems may maintain high conservation value.

Item Type: Article
Authors/Creators:Cook, KM and Yamagiwa, H and Beger, M and Masucci, GD and Ross, S and Lee, HYT and Stuart-Smith, RD and Reimer, JD
Keywords: coastal reefs, community turnover, functional traits, Okinawa, temporal change, urbanization
Journal or Publication Title: Ecology and Evolution
Publisher: John Wiley & Sons Ltd
ISSN: 2045-7758
DOI / ID Number: 10.1002/ece3.8736
Copyright Information:

© 2022. The Authors. This is an open access article under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License, (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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