Publication details.


Author(s):I. Castejón-Silvo, J. Terrados
Title:Experimental assessment of Posidonia oceanica-associated gastropods grazing on an early-successional biofilm community: nutrient availability and species-specific effects
Journal:Marine Ecology-An Evolutionary Perspective
JCR Impact Factor:1.246
Issue No.:1
Although grazing is considered an essential process controlling epiphyte biomass
on seagrass leaves, there is still a lack of fundamental knowledge about
the species-specific consumption rates of the most common grazers in Mediterranean
meadows. This study experimentally assessed the effect of Posidonia
oceanica-associated gastropod grazing on early successional biofilm and the
species-specific relationship between biofilm consumption rates and biofilm
biomass. Two biofilms on artificial substrata, both developed in situ (in a
P. oceanica meadow), one under ambient conditions and the other under
nutrient-enriched conditions, were offered in aquaria assays to nine species of
grazers found in P. oceanica meadows. Biofilm consumption rates and their
association with biofilm biomass were assessed. It was found that: (i) there was
a positive association between biofilm consumption and biofilm biomass up to
20 mg Chl a m-2 for Bittium reticulatum, Gibbula ardens, Jujubinus exasperatus
and Tricolia pullus; (ii) Alvania montagui, B. reticulatum and Jujubinus striatus
showed the highest consumption rates and are thus expected to be amongst
the leading consumers in early-successional epiphytic communities; (iii) there
was not an increase of consumption rate when a substratum colonized under
nutrient-enriched conditions was offered to any of the nine studied species.
This study provides species-specific consumption rates knowledge that is useful
for the assessment of the strength of grazer–epiphyte interactions and trophic
fluxes in P. oceanica meadows.

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  • Inés Castejón Silvo
  • Jorge Terrados Muñoz
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