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Impacts of artisanal fishing on key functional groups and the potential vulnerability of coral reefs
Stockholm University, Faculty of Science, Department of Systems Ecology.
Stockholm University, Stockholm Resilience Centre.
Stockholm University, Faculty of Science, Department of Systems Ecology.
Stockholm University, Stockholm Resilience Centre.
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2010 (English)In: Environmental Conservation, ISSN 0376-8929, E-ISSN 1469-4387, Vol. 36, no 4, 327-337 p.Article in journal (Refereed) Published
Abstract [en]

Fishing can have major impacts on the structure of coral reef ecosystems. Overfishing of herbivores is particularly detrimental, as it makes the coral system more likely to undergo shifts to macroalgal dominance in the event of coral mass mortality. Knowing when important processes, such as herbivory, are becoming brittle is important because it can provide an opportunity for managers to avoid undesirable ecosystem-level changes. This study investigates the impact of artisanal fishing on three important functional groups of herbivores (grazers, scrapers and excavators) on five coral-dominated reefs outside Zanzibar (Tanzania). There was a negative correlation between fishing pressure and fish biomass, abundance, diversity and species richness. Moreover, fishing had a negative influence on the demographic structure of functional groups, particularly excavators, manifesting itself as a skewness towards smaller individuals within populations. Artisanal fishing can have significant impacts on key functional groups of herbivorous reef fishes which may increase the vulnerability of coral reefs to undesirable ecosystem shifts.

Place, publisher, year, edition, pages
Online, 2010. Vol. 36, no 4, 327-337 p.
National Category
Other Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-53762DOI: 10.1017/S0376892910000147OAI: oai:DiVA.org:su-53762DiVA: diva2:391259
Note
EC PerspectivesAvailable from: 2011-01-24 Created: 2011-01-24 Last updated: 2017-12-11Bibliographically approved

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Nyström, MagnusNorström, Albert V.Folke, Carl
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