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Polar Biology

, Volume 42, Issue 2, pp 317–334 | Cite as

The importance of macroalgae and associated amphipods in the selective benthic feeding of sister rockcod species Notothenia rossii and N. coriiceps (Nototheniidae) in West Antarctica

  • Esteban Barrera-OroEmail author
  • Eugenia Moreira
  • Meike Anna Seefeldt
  • Mariano Valli Francione
  • María Liliana Quartino
Original Paper

Abstract

Studies on feeding selectivity in Antarctic fish with comparison between diet organisms and those available in the wild are scarce. We explored this issue in Notothenia rossii (NOR) and N. coriiceps (NOC) at Potter Cove in summer 2016 to test: (1) their preference among different benthic groups, primarily species of algae and amphipods and (2) differences between these nototheniids given their distinct morphology but their known similar general ecology in the fjords. The methodology included a comparative analysis of benthic organisms identified in the stomachs and those collected on macroalgal beds (Ivlev Index). Benthic amphipods, mainly Gondogeneia antarctica and Cheirimedon femoratus, followed by macroalgae, mainly Palmaria decipiens and Desmarestia spp., were the most important and frequent dietary items (IRI%) for both nototheniids. However, NOC was more herbivorous and fed more intensively on a wider diversity of benthic organisms such as certain algal-associated groups like gastropods and bivalves, whereas NOR fed on a greater proportion of epibenthic amphipods and other epibenthic prey. Although in the last three decades the physiognomy of the inner cove has been changed due to the retreat of the Fourcade Glacier, at our sampling site in the outer cove the abundance and vertical distribution of macroalgae did not show substantial changes compared with those reported in the literature in 1994–1996. Temporal differences in the feeding selectivity of NOC on amphipod species, between contemporary and historical samples, may be explained by variations in the assemblage of the algal-associated epifauna. We suggest factors that may have produced these changes.

Keywords

Antarctic fish Diet Potter Cove South Shetland Islands Marine ecology 

Notes

Acknowledgements

We thank C. Bellisio and J. Acosta for their help in field activities and laboratory tasks and Lic. G. Campana for the sampling bags. The divers and boat drivers of Carlini Station provided valuable logistic support. We are very grateful to Prof. J. T. Eastman for his valuable comments on the manuscript. This study was undertaken within the scientific collaboration between Instituto Antártico Argentino and the Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research. It was supported by grants from ANPCyT-DNA (PICTO 0100–2010). M.A.S. was funded by the German Science Foundation (DFG) with the project HE 3391/7–1 within the Priority Programme 1158 on Antarctic Research. This paper presents an outcome of the EU research network IMCONet funded by the Marie Curie Action IRSES (FP7 IRSES, Action No. 319718).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.

Supplementary material

300_2018_2424_MOESM1_ESM.doc (146 kb)
Electronic supplementary material 1 (DOC 146 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Instituto Antártico ArgentinoSan MartínArgentina
  2. 2.Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)Buenos AiresArgentina
  3. 3.Museo Argentino de Ciencias Naturales Bernardino RivadaviaBuenos AiresArgentina
  4. 4.Functional Ecology SectionAlfred Wegener Institute Helmholtz Centre for Polar and Marine ResearchBremerhavenGermany
  5. 5.Department of Animal Ecology, Evolution and Biodiversity, Faculty of Biology and BiotechnologyRuhr University BochumBochumGermany
  6. 6.Universidad Nacional de General SarmientoLos PolvorinesArgentina

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