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- W2023365817 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 414:65-74 (2010) - DOI: https://doi.org/10.3354/meps08730 Sea urchins, macroalgae and coral reef decline: a functional evaluation of an intact reef system, Ningaloo, Western Australia C. L. Johansson1, 2,*, D. R. Bellwood1, M. Depczynski3 1Australian Research Council Centre of Excellence for Coral Reef Studies and School of Marine and Tropical Biology, James Cook University, Townsville, Queensland 4811, Australia 2AIMS@JCU, Australian Institute of Marine Science, School of Marine and Tropical Biology, James Cook University, Townsville, Queensland 4811, Australia 3Australian Institute of Marine Science, UWA Oceans Institute, Crawley, Western Australia 6009, Australia *Email: charlotte.johansson@jcu.edu.au ABSTRACT: The number of relatively untouched coral reefs worldwide is rapidly decreasing. Nevertheless, one coral reef ecosystem remains relatively intact: the largest west-continental reef ecosystem in the world, Ningaloo Reef in Western Australia. This study investigated the status of 2 potential bio-indicators for coral reef decline, macroalgae and sea urchin densities, on this reef. Surprisingly, both were abundant, with the presence of extensive macroalgal beds in the sandy lagoon and a sea urchin-dominated reef slope. The algal distribution on Ningaloo reflected marked cross-shelf variation in the composition of fish functional groups, with only the back reef and the reef slope exhibiting high grazing rates (completely scraped every 43 and 59 d, respectively). Estimated bioerosion rates by fishes ranged between 1 and 2.3 kg m–2 yr–1. Echinoids only played a significant role in bioerosion on the reef slopes owing to their high abundance in that habitat (>12 individuals m–2). Here, estimated echinoid erosion equalled that of the most abundant excavating parrotfish, Chlorurus sordidus. High echinoid and macroalgal abundances on this relatively intact reef system highlight the need for caution when using these metrics for evaluating reef ecosystem condition. KEY WORDS: Ningaloo · Herbivory · Echinoderms · Algae · Parrotfish · Functional groups · Ecosystem function · Coral reef Full text in pdf format Supplementary material PreviousNextCite this article as: Johansson CL, Bellwood DR, Depczynski M (2010) Sea urchins, macroalgae and coral reef decline: a functional evaluation of an intact reef system, Ningaloo, Western Australia. Mar Ecol Prog Ser 414:65-74. https://doi.org/10.3354/meps08730Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 414. Online publication date: September 13, 2010 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2010 Inter-Research." @default.
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- W2023365817 title "Sea urchins, macroalgae and coral reef decline: a functional evaluation of an intact reef system, Ningaloo, Western Australia" @default.
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