ARAN - Access to Research at NUI Galway

Like a rolling stone: the mobility of maerl (corallinaceae) and the neutrality of the associated assemblages.

ARAN - Access to Research at NUI Galway

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dc.contributor.author Johnson, Mark P. en
dc.date.accessioned 2009-09-28T11:06:57Z en
dc.date.available 2009-09-28T11:06:57Z en
dc.date.issued 2008 en
dc.identifier.citation Hinojosa-Arango G., Maggs C. A. and Johnson M.P. Like a rolling stone: the mobility of maerl (corallinaceae) and the neutrality of the associated assemblages. Ecology 90, 517-528. en
dc.identifier.issn 0012-9658 en
dc.identifier.uri http://hdl.handle.net/10379/316 en
dc.description.abstract Beds of non-attached coralline algae (maerl or rhodoliths) are widespread and considered relatively species rich. This habitat is generally found in areas where there is chronic physical disturbance such that maerl thalli are frequently moved. Little is known, however, about how natural disturbance regimes affect the species associated with maerl. This study compared the richness, animal abundance and algal biomass of maerl-associated species over a two year period in a wave disturbed and a sheltered maerl bed. Changes in associated species over time were assessed for departures from a neutral model, where the dissimilarity between samples reflects random sampling from a common species pool. Algal biomass and species richness at the wave exposed site and on stabilized maerl at the sheltered site were reduced at times of higher wind speeds. The changes in species richness were not distinguishable from a neutral model, implying that algal species were added at random to the assemblage as the level of disturbance lessened. Results for animal species were more mixed. Although mobile species were less abundant during windy periods at the exposed site, both neutral and non-neutral patterns were evident in the assemblages. Artificial stabilization of maerl had inconsistent effects on the richness of animals, but always resulted in more attached algal species. While the results show that the response of a community to disturbance can be neutral, the domain of neutral changes in communities may be relatively small. Alongside non-neutral responses to natural disturbance, artificial stabilization always resulted in an assemblage that was more distinct than would be expected under random sampling from a common pool. Community responses to stabilization treatments did not consistently follow the predictions of the dynamic equilibrium model, intermediate disturbance model or a facilitation model. These inconsistencies may reflect site-specific variation in both the disturbance regime and the adjacent habitats that provide source populations for many of the species found associated with maerl. en
dc.format application/pdf en
dc.language.iso en en
dc.publisher Ecological Society of America en
dc.subject Nestedness en
dc.subject Disturbance en
dc.subject Rhodolith en
dc.subject Stability en
dc.subject Phymatolithon Calcareum en
dc.subject.lcsh Coralline algae en
dc.subject.lcsh Ecological distrubances en
dc.title Like a rolling stone: the mobility of maerl (corallinaceae) and the neutrality of the associated assemblages. en
dc.type Article en
dc.local.publisherstatement Copyright by the Ecological Society of America en
dc.description.peer-reviewed peer-reviewed en

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