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Top-down and bottom-up effects on Red Sea coral reef algae

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2012

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Jessen, Christian
Roder, Cornelia
Villa Lizcano, Javier
Wild, Christian

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YELLOWLEES, David, ed., Terry HUGHES, ed.. Proceedings of the 12th International Coral Reef Symposium. Townsville, Australia: James Cook University, 2012, ICRS2012_11A_1. ISBN 978-0-9808572-5-2

Zusammenfassung

Overfishing and eutrophication can lead to a reduction in herbivory and an increase in algae growth, respectively. Therefore, they are among the most significant local pressures on coral reefs. In particular Red Sea coral reefs, with their high degree of endemism, are increasingly threatened by effects of coastal development and overfishing. Here, we evaluated the independent and combined effects of the top-down factor herbivory and the bottom -up factor inorganic nutrient availability in an offshore reef of the Central Red Sea. We deployed exclosure cages and fertilizer sources in situ over 4 months (with 5 temporal samplings) to study development of dry mass and fu nctional groups of algae on installed terracotta tiles. Our findings indicate that exclusion of herbivores had a stronger impact than eutrophication alone, and the combined treatment had the highest impact. The effect of elevated nutrients alone had no impact on composition of functional algae groups, dry mass, and the development of organic carbon (Corg) and nitrogen (N) on the tiles. However, when larger herbivores were excluded, tile surface cover changed drastically from patchy non-coralline crusts to filamentous algae. Dry mass increased up to 300 times, and with additional nutrient enrichment up to 500 times, though strong successional patterns could be observed. Our study is the first from the Red Sea that evaluates top-down and bottom-up factors on algae development and underlines the importance of addressing both of these factors in management measures to preserve the local coral reef resources.

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Fachgebiet (DDC)
570 Biowissenschaften, Biologie

Schlagwörter

Red Sea, Herbivory, Cage experiments, Eutrophication, Settlement tiles

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12th International Coral Reef Symposium, 9. Juli 2012 - 13. Juli 2012, Cairns, Queensland, Australia
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ISO 690JESSEN, Christian, Cornelia RODER, Javier VILLA LIZCANO, Christian R. VOOLSTRA, Christian WILD, 2012. Top-down and bottom-up effects on Red Sea coral reef algae. 12th International Coral Reef Symposium. Cairns, Queensland, Australia, 9. Juli 2012 - 13. Juli 2012. In: YELLOWLEES, David, ed., Terry HUGHES, ed.. Proceedings of the 12th International Coral Reef Symposium. Townsville, Australia: James Cook University, 2012, ICRS2012_11A_1. ISBN 978-0-9808572-5-2
BibTex
@inproceedings{Jessen2012Topdo-66711,
  year={2012},
  title={Top-down and bottom-up effects on Red Sea coral reef algae},
  isbn={978-0-9808572-5-2},
  publisher={James Cook University},
  address={Townsville, Australia},
  booktitle={Proceedings of the 12th International Coral Reef Symposium},
  editor={Yellowlees, David and Hughes, Terry},
  author={Jessen, Christian and Roder, Cornelia and Villa Lizcano, Javier and Voolstra, Christian R. and Wild, Christian},
  note={Article Number: ICRS2012_11A_1}
}
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