Feeding habits and food partitioning between three commercial fish associated with artificial reefs in a tropical coastal environment

  • C Mablouké
  • J Kolasinski
  • M Potier
  • A Cuvillier
  • G Potin
  • L Bigot
  • P Frouin
  • S Jaquemet

Abstract

At Réunion Island (south-western Indian Ocean), artificial reefs were submerged in 2003 in a bay and were soon colonised by fish, among which were the highly abundant commercial species Lutjanus kasmira, Priacanthus hamrur and Selar crumenophthalmus. The high concentration and diversity of fish around the artificial reefs is surprising, considering the low abundance of potential benthic prey. We investigated the diet and food partitioning between the aforementioned species using stomach content and stable isotope analyses (δ13C,δ15N). Priacanthus hamrur and S. crumenophthalmus fed on a larger prey diversity and showed significant overlap in their diets, with crustacean larvae the dominant prey. Fish larvae dominated L. kasmira’s diet, and δ15N values confirmed the species’ higher trophic level. Differences in δ13C between P. hamrur and S. crumenophthalmus indicated niche segregation, probably as a way to reduce competition, with P. hamrur being characterised by a smaller δ13C range and exhibiting a smaller isotopic niche than S. crumenophthalmus. There was a significant correlation between δ15N and fish standard length for the three species, suggesting that ontogeny partially explained the niche breadth. There was also a significant correlation between δ13C and length for L. kasmira, whereas individual specialisation was prevalent in S. crumenophthalmus.

Keywords: Lutjanus kasmira, Priacanthus hamrur, Réunion Island, Selar crumenophthalmus, stable isotopes, stomach contents, trophic niche width

African Journal of Marine Science 2013, 35(3): 323–334

Author Biographies

C Mablouké
Université de la Réunion, Laboratoire ECOMAR FRE 3560 (CNRS/INEE/UR), 15 Avenue René Cassin, CS 92003, 97744 Saint-Denis Cedex 09, France
J Kolasinski
IsoEnvironmental cc, Botany Department, Rhodes University, PO Box 94, Grahamstown 6140, South Africa
M Potier
IRD, UMR 212 EME (IRD/IFREMER/UM2), Centre de Recherche Halieutique Méditerranéenne et Tropicale, Avenue Jean Monet, BP 171, 34 203 Sète Cedex, France
A Cuvillier
Université de la Réunion, Laboratoire ECOMAR FRE 3560 (CNRS/INEE/UR), 15 Avenue René Cassin, CS 92003, 97744 Saint-Denis Cedex 09, France
G Potin
Université de la Réunion, Laboratoire ECOMAR FRE 3560 (CNRS/INEE/UR), 15 Avenue René Cassin, CS 92003, 97744 Saint-Denis Cedex 09, France
L Bigot
Université de la Réunion, Laboratoire ECOMAR FRE 3560 (CNRS/INEE/UR), 15 Avenue René Cassin, CS 92003, 97744 Saint-Denis Cedex 09, France
P Frouin
Université de la Réunion, Laboratoire ECOMAR FRE 3560 (CNRS/INEE/UR), 15 Avenue René Cassin, CS 92003, 97744 Saint-Denis Cedex 09, France
S Jaquemet
Université de la Réunion, Laboratoire ECOMAR FRE 3560 (CNRS/INEE/UR), 15 Avenue René Cassin, CS 92003, 97744 Saint-Denis Cedex 09, France; IsoEnvironmental cc, Botany Department, Rhodes University, PO Box 94, Grahamstown 6140, South Africa; IRD, UMR 212 EME (IRD/IFREMER/UM2), Centre de Recherche Halieutique Méditerranéenne et Tropicale, Avenue Jean Monet, BP 171, 34 203 Sète Cedex, France
Published
2013-10-24
Section
Articles

Journal Identifiers


eISSN: 1814-2338
print ISSN: 1814-232X