Do native herbivores provide resistance to Mediterranean marine bioinvasions? A seaweed example

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dc.contributor.author Cebrián Pujol, Emma
dc.contributor.author Ballesteros i Segarra, Enric
dc.contributor.author Linares, Cristina
dc.contributor.author Tomás, Fiona
dc.date.issued 2011
dc.identifier.issn 1387-3547 (versió paper)
dc.identifier.issn 1573-1464 (versió electrònica)
dc.identifier.uri http://hdl.handle.net/10256/7135
dc.description.abstract Generalist herbivores in marine ecosystems are poorly examined for their potential to serve as a source of biotic resistance against algal invasion. We assessed how one of the main generalist herbivores in Mediterranean rocky reefs (the sea urchin Paracentrotus lividus) affects Lophocladia lallemandii and Caulerpa racemosa, two algal invaders with strong detrimental effects on native benthic communities. In a comparison of sea urchin gut contents to algal community composition, strong preferences were exhibited, leading to no relationship between consumption and availability. Both C. racemosa and L. lallemandi were abundant in algal assemblages (>60% occurrence), but C. racemosa (20% of diet) was consumed more than L. lallemandi (3.5%). Experimental enclosures of sea urchins (12 sea urchins * m−2) were carried out in locations where L. lallemandii was already established and C. racemosa was rare (new invasion) or abundant (established invasion). C. racemosa was negatively affected by sea urchins only when it was rare, and no effect was detected when the alga was already abundant. Results for L. lallemandi were exactly opposite: urchins limited seasonal increases in L. lallemandi in highly-invaded areas. Because of the small amount of direct consumption of L. lallemandi, its decrease in abundance may be related to the grazing of native algae where L. lallemandii is attached. Overall, our results show that high densities of native herbivores may reduce invasive algae at low densities, due to a combination of direct and indirect effects, but it has no significant effect in highly-invaded areas
dc.format.mimetype application/pdf
dc.language.iso eng
dc.relation.isformatof Reproducció digital del document publicat a: http://dx.doi.org/10.1007/s10530-010-9898-1
dc.relation.ispartof © Biological Invasions, 2011, vol. 13, núm. 6, p. 1397-1408
dc.relation.ispartofseries Articles publicats (D-CCAA)
dc.rights Tots els drets reservats
dc.subject Invasions biològiques -- Mediterrània, Mar
dc.subject Plantes invasores -- Mediterrània, Mar
dc.subject Algues marines -- Mediterrània, Mar
dc.subject Invasive plants -- Mediterranean Sea
dc.subject Biological invasions -- Mediterranean Sea
dc.subject Marine algae -- Mediterranean Sea
dc.title Do native herbivores provide resistance to Mediterranean marine bioinvasions? A seaweed example
dc.type info:eu-repo/semantics/article
dc.rights.accessRights info:eu-repo/semantics/closedAccess
dc.relation.projectID info:eu-repo/grantAgreement/EC/FP7/248252
dc.type.version info:eu-repo/semantics/publishedVersion
dc.identifier.doi http://dx.doi.org/10.1007/s10530-010-9898-1


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