AustralieFrV1, Main, Exploration, bibRecord, 006D18

Associational refuges among corals mediate impacts of a crown-of-thorns starfish Acanthaster planci outbreak: Indirect positive interactions in communities

Identifieur interne : 006D18 ( Main/Exploration ); précédent : 006D17; suivant : 006D19

Associational refuges among corals mediate impacts of a crown-of-thorns starfish Acanthaster planci outbreak: Indirect positive interactions in communities

Auteurs : Mohsen Kayal [Polynésie française] ; Hunter S. Lenihan [États-Unis] ; Cedric Pau [Polynésie française, France] ; Lucie Penin [Polynésie française, France, Australie] ; Mehdi Adjeroud [France]

Source :

Coral reefs : (Print) [ 0722-4028 ] ; 2011.

RBID : Pascal:11-0383837

Descripteurs français

Pascal (Inist)
- Zone refuge, Corail, Houppier, Pullulation, Interaction, Communauté, Prédation, Mortalité, Habitat, Résilience, Récif corallien, Cnidaria, Asteroidea, Acanthaster planci.
Wicri :
- topic : Mortalité, Habitat.

English descriptors

KwdEn :
- Acanthaster planci, Asteroidea, Cnidaria, Community, Coral, Coral reef, Habitat, Interaction, Mortality, Outbreak, Predation, Refuge, Resilience, Tree crown.

Abstract

Interactions among coral populations can moderate the impact of coral predator outbreaks, enhancing community resilience and recovery. This study used predator-exclusion cages and neighbour removals in a field experiment to test how indirect interactions between populations of three coral taxa, Acropora, Pocillopora, and Porites, influenced their survival during an outbreak of the crown-of-thorns starfish, Acanthaster planci, in Moorea, French Polynesia. High densities of corals enhanced survival by generating associational refuges: physical structures that impeded Acanthaster and protected corals, and by simple density-dependent prey dilution that reduced predation rates. Acarethaster showed feeding preferences, resulting in varying intensities of predation on corals, which (1) influenced the type and strength of the associational refuge among corals and (2) resulted in significant loss of the competitive dominants to the benefit of the competitive inferiors. The result was a set of indirect positive interactions (IPIs) that prevented Acanthaster from eradicating Acropora and may have enhanced Porites, a relatively weak competitor among corals. IPIs probably play a key role in many ecosystems, especially in coral reefs in which corals act as engineer species, to reduce impacts of perturbations and enhance community resilience. This study illustrates the importance of IPIs in community regulation with a new conceptual model.

Affiliations:

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Le document en format XML

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<term>Coral reef</term>
<term>Habitat</term>
<term>Interaction</term>
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<term>Predation</term>
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<term>Communauté</term>
<term>Prédation</term>
<term>Mortalité</term>
<term>Habitat</term>
<term>Résilience</term>
<term>Récif corallien</term>
<term>Cnidaria</term>
<term>Asteroidea</term>
<term>Acanthaster planci</term>
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<front><div type="abstract" xml:lang="en">Interactions among coral populations can moderate the impact of coral predator outbreaks, enhancing community resilience and recovery. This study used predator-exclusion cages and neighbour removals in a field experiment to test how indirect interactions between populations of three coral taxa, Acropora, Pocillopora, and Porites, influenced their survival during an outbreak of the crown-of-thorns starfish, Acanthaster planci, in Moorea, French Polynesia. High densities of corals enhanced survival by generating associational refuges: physical structures that impeded Acanthaster and protected corals, and by simple density-dependent prey dilution that reduced predation rates. Acarethaster showed feeding preferences, resulting in varying intensities of predation on corals, which (1) influenced the type and strength of the associational refuge among corals and (2) resulted in significant loss of the competitive dominants to the benefit of the competitive inferiors. The result was a set of indirect positive interactions (IPIs) that prevented Acanthaster from eradicating Acropora and may have enhanced Porites, a relatively weak competitor among corals. IPIs probably play a key role in many ecosystems, especially in coral reefs in which corals act as engineer species, to reduce impacts of perturbations and enhance community resilience. This study illustrates the importance of IPIs in community regulation with a new conceptual model.</div>
</front>
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Associational refuges among corals mediate impacts of a crown-of-thorns starfish Acanthaster planci outbreak: Indirect positive interactions in communities

Associational refuges among corals mediate impacts of a crown-of-thorns starfish Acanthaster planci outbreak: Indirect positive interactions in communities

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri