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Cebrian Pujol, Emma
Ballesteros i Sagarra, Enric Linares, Cristina Tomàs Nash, Fiona |
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2011 | |
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 | |
application/pdf | |
http://hdl.handle.net/10256/7135 | |
eng | |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s10530-010-9898-1 info:eu-repo/semantics/altIdentifier/issn/1387-3547 info:eu-repo/semantics/altIdentifier/eissn/1573-1464 info:eu-repo/grantAgreement/EC/FP7/248252/EU/Effects of global warming and alien species invasions on high diverse communities of NW Mediterranean Sea./CORALCHANGE |
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Tots els drets reservats | |
Invasions biològiques -- Mediterrà nia, Mar
Plantes invasores -- Mediterrà nia, Mar Algues marines -- Mediterrà nia, Mar Invasive plants -- Mediterranean Sea Biological invasions -- Mediterranean Sea Marine algae -- Mediterranean Sea |
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Do native herbivores provide resistance to Mediterranean marine bioinvasions? A seaweed example | |
info:eu-repo/semantics/article | |
DUGiDocs |