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Marine Biology

, 166:153 | Cite as

Resource partitioning among sympatric elasmobranchs in the central-western Mediterranean continental shelf

  • Antonello MulasEmail author
  • Andrea Bellodi
  • Rita Cannas
  • Pierluigi Carbonara
  • Alessandro Cau
  • Martina Francesca Marongiu
  • Paola Pesci
  • Cristina Porcu
  • Maria Cristina Follesa
Original Paper

Abstract

Knowledge of the mechanisms that allow coexistence among sympatric species is fundamental to understand ecosystem functioning. Resource partitioning among seven elasmobranchs inhabiting the Sardinian continental shelf (40°07′N, 9°00′E): Dasyatis pastinaca; Raja asterias; R. brachyura; R. clavata; R. miraletus; R. polystigma and Scyliorhinus canicula, was investigated through stomach content analysis. Data from 1680 samples collected between 2005 and 2014, in 26–200 m depth, were analysed with respect to population, sex, season (winter and summer) and size groups. Species living in shallower waters (characterized by a narrower bathymetric range) had the most specialized diets. All species appeared to be mesopredators, feeding mainly on Crustacea, Actinopterygii, Mollusca and Polychaeta. Despite shared common morphological features, from the high ecological diversity of prey items, we hypothesized the presence of different predatory behavior among the species studied: some species were able to feed on endobenthic and/or epibenthic organisms, while others had made limited movements in the water column. Non-parametric Multi-Dimensional Scaling analysis highlighted the presence of five predator groups, confirming strong resource partitioning, as also demonstrated by low levels of interspecific niche overlap. The observed variations in feeding habits could be ascribed only to size and not to sex or season. Generally, diet changed from small Crustacean prey, to larger prey, like Actinopterygii and Mollusca. Some species became more generalist during development, others restricted their prey range. Shifts in feeding habits affected species’ roles in the food web, with different species occupying different functional trophic groups over the course of their life cycles.

Notes

Acknowledgements

The authors would like to thank the Responsible Editor, Dr. Ewan Hunter, and the anonymous referee for their constructive comments and their kind help in improving the manuscript.

Funding

Funding for this research were provided by the European Union and the Italian Ministry for Agriculture and Forestry.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

Samples were collected from monitoring programs. All applicable international, national, and/or institutional guidelines for the care and use of organisms for the study were followed.

Supplementary material

227_2019_3607_MOESM1_ESM.pdf (839 kb)
Supplementary material 1 (PDF 840 kb)

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Authors and Affiliations

  1. 1.Department of Life and Environmental SciencesUniversity of CagliariCagliariItaly
  2. 2.CoNISMa, Consorzio Interuniversitario per le Scienze del MareRomeItaly
  3. 3.COISPA Tecnologia & Ricerca, Stazione Sperimentale per lo Studio delle Risorse del MareBariItaly

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