Trophic structure of vermetid reef community: High trophic diversity at small spatial scales

Type Article
Date 2013-03
Language English
Author(s) Colombo Francesca1, Costa Valentina1, 2, Dubois StanislasORCID3, Gianguzza Paola1, Mazzola Antonio1, Vizzini Salvatrice1
Affiliation(s) 1 : Univ Palermo, Dept Earth & Marine Sci, CoNISMa, I-90123 Palermo, Italy.
2 : Univ Parma, Dept Environm Sci, I-43124 Parma, Italy.
3 : IFREMER, Lab Benth Ecol, F-29280 Plouzane, France.
Source Journal Of Sea Research (1385-1101) (Elsevier Science Bv), 2013-03 , Vol. 77 , P. 93-99
DOI 10.1016/j.seares.2012.10.005
WOS© Times Cited 14
Keyword(s) Dendropoma petraeum, Stable Isotope, Bayesian Mixing Model, Trophic Niche, Intertidal
Abstract Stable isotopes were used to investigate contributions of autochthonous (i.e. benthic: epilithon and macroalgae) and allochthonous (i.e. pelagic: phytoplankton) organic matter sources to the diet of suspension-feeders, grazers and predators associated to small reef-pools (cuvettes) created by the reef-building species Dendropoma petraeum in the north-western coast of Sicily (Italy). Contributions of potential food sources were calculated using Bayesian mixing-models and integrated to a multivariate approach to highlight the diversity of C and N pathways within Dendropoma cuvettes. Both pelagic and benthic organic matter sources were exploited by benthic consumers, although clear differences were revealed in the various species depending on their feeding strategy. Three different trophic pathways were identified: one based mainly on phytoplankton, one based mainly on macroalgae and a third one mainly on epilithon. Suspension-feeders seemed to rely mainly on allochthonous organic matter sources, while grazers showed a wider diet spectrum. Predators revealed a high specialization in each of the three food chains and showed a distinct reliance on organic matter originated from benthic or pelagic sources. Stable isotopes evidenced here a marked differentiation of the trophic niche within the cuvette-associated community, which allows minimizing competition in very space-limited conditions. (C) 2012 Elsevier B.V. All rights reserved.
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