Marine Biology

, 164:86 | Cite as

Trophic structure in the northern Humboldt Current system: new perspectives from stable isotope analysis

  • Pepe Espinoza
  • Anne Lorrain
  • Frédéric Ménard
  • Yves Cherel
  • Laura Tremblay-Boyer
  • Juan Argüelles
  • Ricardo Tafur
  • Sophie Bertrand
  • Yann Tremblay
  • Patricia Ayón
  • J.-M. Munaron
  • Pierre Richard
  • Arnaud Bertrand
Original Paper

Abstract

The northern Humboldt Current system (NHCS) is the most productive eastern boundary upwelling system (EBUS) in terms of fish productivity despite having a moderate primary production compared with other EBUS. To understand this apparent paradox, an updated vision of the trophic relationships in the NHCS is required. Using δ13C and δ15N as a proxy of foraging habitat and trophic position, respectively, we focused on thirteen relevant taxonomic groups from zooplankton to air-breathing top predators collected off Peru from 2008 to 2011. Estimates of trophic position (TP) for the anchoveta Engraulis ringens were high (3.4–3.7), in accordance with previous studies showing zooplankton as a major contributor to anchoveta diet and challenging the often-cited short food chain hypothesis for this ecosystem. The squat lobster, Pleuroncodes monodon, a little studied consumer had similar δ15N values that of anchoveta, and thus similar trophic position. However, their differing δ13C values indicate that their foraging habitat do not fully overlap, which could alleviate potential competition between these species. Given the current high biomass of squat lobsters in the ecosystem, we encourage that future research focus on this species and its role in the diet of top predators. The present study provides first estimates of the relative TP of important taxonomic groups in the NHCS, which are needed to revisit anchoveta-centred ecosystem models for this region. Further work using amino acid compound specific stable isotope analyses is now required to confirm these TP estimates.

Notes

Acknowledgements

This work is a contribution to the cooperative agreement between the Instituto del Mar del Peru (IMARPE), the Institut de Recherche pour le Developpement (IRD), and of the LMI DISCOH. This publication was made possible through support provided by the ANR TOPINEME. We would like to thank G. Guillou from the LIENSs laboratory for stable isotope analysis, and the two anonymous reviewers for their constructive comments on the manuscript. PE was financially supported by the BEST Grant from IRD and managed by Campus France.

Compliance with ethical standards

This study was funded by IRD, IMARPE and ANR TOPINEME. None of the coauthors have ethical issues arising from conflicts of interest. All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.

Supplementary material

227_2017_3119_MOESM1_ESM.pdf (78 kb)
Supplementary material 1 (PDF 78 KB)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Pepe Espinoza
    • 1
    • 2
  • Anne Lorrain
    • 3
  • Frédéric Ménard
    • 4
  • Yves Cherel
    • 5
  • Laura Tremblay-Boyer
    • 6
  • Juan Argüelles
    • 1
  • Ricardo Tafur
    • 1
  • Sophie Bertrand
    • 2
  • Yann Tremblay
    • 2
  • Patricia Ayón
    • 1
  • J.-M. Munaron
    • 3
  • Pierre Richard
    • 7
  • Arnaud Bertrand
    • 2
  1. 1.Instituto del Mar del PerúLimaPeru
  2. 2.IRD, UMR248 MARBEC IRD/IFREMER/UM/CNRSSète CedexFrance
  3. 3.IRD, LEMAR UMR 6539 IFREMER/IRD/CNRS/UBOPlouzanéFrance
  4. 4.Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIOMarseilleFrance
  5. 5.Centre d’Études Biologiques de Chizé (CEBC)UMR 7372 du CNRS-Université de La RochelleVilliers-en-boisFrance
  6. 6.Secretariat of the Pacific Community, SPCNouméa CedexNew Caledonia
  7. 7.Littoral, Environnement et SociétésUMR 7266 CNRS-Université de La RochelleLa RochelleFrance

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