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dc.contributor.authorHereu, Bernat-
dc.contributor.authorZabala, Mikel-
dc.contributor.authorSala, Enric-
dc.identifier.citationEcology 89(12) : 3423-3435 (2008)es_ES
dc.description13 páginas, 4 figuras, 1 foto.es_ES
dc.description.abstractThe structure and dynamics of ecological communities can be determined by both top-down (e.g., predation) and bottom-up (e.g., energy inputs) processes, which can act synergistically and across spatial and temporal scales. Here we aimed at understanding the role of multiple controls in a Mediterranean rocky sublittoral marine community that harbors a diverse algal community and strongly interacting herbivores, and which is subject to marked seasonality in energy inputs. We conducted an experiment by manipulating densities of the major consumers of benthic algae (fishes and sea urchins) in ;100-m 2 enclosures in a marine reserve, and monitored algal assemblages over two and a half years. Most algae showed a marked annual cycle, with a biomass peak in late spring/summer and low biomass in winter, following seasonal fluctuations in resource availability, indicating the existence of bottom-up processes. Sea urchins reduced the abundance of most algal species, indicating the existence of top-down processes. The effect of fish grazing on algal abundances was significantly weaker. Sea urchin grazing was inhibited when predatory fish were present. Multivariate analysis showed that the interaction between seasonal resource inputs and herbivory induced the formation of algal assemblages characterized by different species abundances. The organization of algal assemblages was determined by the synergistic interaction between top-down and bottom-up processes: top-down control regulated total algal abundance, while bottom-up control determined seasonal fluctuations.es_ES
dc.description.sponsorshipThis study was funded by grant MAR1999-0526 from the Spanish Department of Education and Science, and by the Department of the Environment of the Catalan Government.es_ES
dc.publisherEcological Society of Americaes_ES
dc.subjectSea urchinses_ES
dc.subjectTop-down processeses_ES
dc.subjectBottom-up processeses_ES
dc.titleMultiple controls of community structure and dynamics in a sublittoral marine environmentes_ES
dc.description.peerreviewedPeer reviewedes_ES
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