Ecological Research

, Volume 24, Issue 1, pp 109–118 | Cite as

Effects of body size, age and maturity stage on diet in a large shark: ecological and applied implications

  • Luis O. Lucifora
  • Verónica B. García
  • Roberto C. Menni
  • Alicia H. Escalante
  • Natalia M. Hozbor
Original Article

Abstract

Ontogenetic diet shifts are a widespread phenomenon among vertebrates, although their relationships with life history traits are poorly known. We analyzed the relative importance of body size, age and maturity stage as determinants of the diet of a marine top predator, the copper shark, Carcharhinus brachyurus, by examining stomach contents using a multiple-hypothesis modeling approach. Copper sharks shifted their diet as size and age increased and as they became sexually mature, incorporated larger prey as they grew, and had a discrete shift in diet with body size, with only individuals larger than ≈200 cm total length able to prey on chondrichthyans. Body size was the most important trait explaining the consumption of chondrichthyans, while age determined the consumption of pelagic teleosts. Pelagic teleosts were consumed mostly by medium-aged sharks, a result, probably, of a risk-reducing feeding strategy at young ages coupled with either a senescence-related decline in performance or a change in sensory capabilities as sharks age. Copper sharks of all sizes were able to cut prey in pieces, implying that gape limitation (i.e., the impossibility of eating prey larger than a predator’s mouth) did not play a role in producing the diet shift. Our results suggest that, contrary to the current practice of setting minimum but not maximum size limits in catches, any plan to conserve or restore the ecological function of sharks, through their predatory control of large prey, should aim to maintain the largest individuals.

Keywords

Predation Ontogenetic niche shift Life history Shark fisheries Patagonia 

Notes

Acknowledgements

Field work was supported by CONICET (Argentina) (scholarship to L.O.L.). L.O.L. and V.B.G. were supported by the Pew Charitable Trusts through the Pew Global Shark Assessment. We thank the fishermen and fish processing plants from Bahía San Blas (Tiburón I, Deró, Penélope, La Barca, Atlántida and La Filetera) for allowing us the access to sample sharks. We thank Claudia Bremec and Diego Giberto for help in the identification of invertebrate prey, and Marti Anderson for advice for conducting the NPMANOVA analysis. We thank Julia Baum, Ariel Farías, Alejandro Frid, Boris Worm and two anonymous reviewers for valuable comments that greatly improved the manuscript. Field work procedures of this study comply with the laws of Argentina.

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Copyright information

© The Ecological Society of Japan 2008

Authors and Affiliations

  • Luis O. Lucifora
    • 1
  • Verónica B. García
    • 1
  • Roberto C. Menni
    • 2
    • 3
  • Alicia H. Escalante
    • 3
    • 4
  • Natalia M. Hozbor
    • 5
  1. 1.Department of BiologyDalhousie UniversityHalifaxCanada
  2. 2.Departamento Científico Zoología VertebradosMuseo de La PlataLa PlataArgentina
  3. 3.Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)Buenos AiresArgentina
  4. 4.Departamento de BiologíaUniversidad Nacional de Mar del PlataMar del PlataArgentina
  5. 5.Instituto Nacional de Investigación y Desarrollo PesqueroMar del PlataArgentina

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