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

Citation

Cook, KM and Yamagiwa, H and Beger, M and Masucci, GD and Ross, S and Lee, HYT and Stuart-Smith, RD and Reimer, JD, A community and functional comparison of coral and reef fish assemblages between four decades of coastal urbanisation and thermal stress, Ecology and Evolution, 12, (3) Article e8736. ISSN 2045-7758 (2022) [Refereed Article]


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DOI: doi:10.1002/ece3.8736

Abstract

  1. 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.
  2. 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.
  3. 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.
  4. 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 (<5 m) and deep (>8 m) coral genera shifting towards the mid-depths (58 m).
  5. 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 Details

Item Type:Refereed Article
Keywords:coastal reefs, community turnover, functional traits, Okinawa, temporal change, urbanization
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and estuarine ecology (incl. marine ichthyology)
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Global effects of climate change (excl. Australia, New Zealand, Antarctica and the South Pacific) (excl. social impacts)
UTAS Author:Stuart-Smith, RD (Dr Rick Stuart-Smith)
ID Code:150889
Year Published:2022
Deposited By:Ecology and Biodiversity
Deposited On:2022-07-04
Last Modified:2022-07-04
Downloads:0

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