English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/90702
COMPARTIR / IMPACTO:
Estadísticas
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Título

Multiple Processes Regulate Long-Term Population Dynamics of Sea Urchins on Mediterranean Rocky Reefs

AutorHereu, Bernat; Linares, Cristina ; Sala, Enric ; Garrabou, Joaquim ; García-Rubies, Antoni ; Díaz, David ; Zabala, Mikel
Fecha de publicaciónmay-2012
EditorPublic Library of Science
CitaciónPLoS ONE 7(5): e36901 (2012)
ResumenWe annually monitored the abundance and size structure of herbivorous sea urchin populations (Paracentrotus lividus and Arbacia lixula) inside and outside a marine reserve in the Northwestern Mediterranean on two distinct habitats (boulders and vertical walls) over a period of 20 years, with the aim of analyzing changes at different temporal scales in relation to biotic and abiotic drivers. P. lividus exhibited significant variability in density over time on boulder bottoms but not on vertical walls, and temporal trends were not significantly different between the protection levels. Differences in densities were caused primarily by variance in recruitment, which was less pronounced inside the MPA and was correlated with adult density, indicating density-dependent recruitment under high predation pressure, as well as some positive feedback mechanisms that may facilitate higher urchin abundances despite higher predator abundance. Populations within the reserve were less variable in abundance and did not exhibit the hyper-abundances observed outside the reserve, suggesting that predation effects maybe more subtle than simply lowering the numbers of urchins in reserves. A. lixula densities were an order of magnitude lower than P. lividus densities and varied within sites and over time on boulder bottoms but did not differ between protection levels. In December 2008, an exceptionally violent storm reduced sea urchin densities drastically (by 50% to 80%) on boulder substrates, resulting in the lowest values observed over the entire study period, which remained at that level for at least two years (up to the present). Our results also showed great variability in the biological and physical processes acting at different temporal scales. This study highlights the need for appropriate temporal scales for studies to fully understand ecosystem functioning, the concepts of which are fundamental to successful conservation and management. © 2012 Hereu et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
Descripción12 pages, 4 figures, 7 tables, supporting information in http://dx.doi.org/10.1371/journal.pone.0036901
Versión del editorhttp://dx.doi.org/10.1371/journal.pone.0036901
URIhttp://hdl.handle.net/10261/90702
DOI10.1371/journal.pone.0036901
Identificadoresdoi: 10.1371/journal.pone.0036901
issn: 1932-6203
Aparece en las colecciones: (ICM) Artículos
(CEAB) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
journal.pone.0036901.pdf703,58 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 

Artículos relacionados:


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.