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Trophic structure of shallow-water benthic communities in the sub-Antarctic Strait of Magellan

Polar Biology volume 39, pages 2281–2297 (2016)Cite this article

Abstract

Trophic structure is among the most fundamental characteristics of an ecosystem since it is a useful way to determine the main energy flow at the ecosystem level. In the Magellan Strait, the local spatial heterogeneity at the shallow-waters ecosystems may have a great variety of potential food sources; however, knowledge about their biological communities and their structure is still unclear. We examined the trophic structure of shallow-water-mixed bottom communities at two sites in the sub-Antarctic Magellan Strait based on carbon (δ 13C) and nitrogen (δ 15N) stable isotope ratios. The benthic communities were composed of 46 species from 20 major taxa at Bahía Laredo (BL) and 55 species from 18 major taxa at Punta Santa Ana (PSA). Benthic macroalgae and organic matter associated with sediment are the major primary food sources at both sites. Although both sites are quite similar in their food sources and in their vertical trophic structure (≥three trophic levels), the food web structure varied distinctly. Functionally, predators and grazers dominated both communities, but top predators were shorebirds, carnivore anemones and predatory nemerteans at BL, and sea stars, shorebirds, crabs and fishes at PSA. The distinct differences in the trophic structure at BL and PSA highlight the important variability of δ 15N at the base of the benthic food web, the role of local environmental conditions and community dynamics in structuring shallow-water communities.

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Acknowledgments

We thank the Laboratorio de Hidrobiología, Instituto de la Patagonia, Universidad de Magallanes for providing partly of the resources for this research. Special thanks go to Lic. Erika Mutschke who made the holdfast samples available for this study and to Dr. Américo Montiel who very kindly identified polychaetes samples. We thank Kerstin Beyer at AWI for her help during the sample preparation of the material for the Stable Isotopes Analyses. We also thank the editor and two anonymous reviewers for their comments, which helped improve this manuscript. This research was supported by a PhD fellowship (A0882368) to CA from the Deutscher Akademischer Austauschdienst (DAAD, Bonn, Germany) and the Comisión Nacional de Ciencia y Tecnología (CONICYT, Santiago, Chile).

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  1. Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Am Alten Hafen 26, 27568, Bremerhaven, Germany

    Claudia Andrade, Dieter Gerdes & Thomas Brey

  2. Instituto de la Patagonia, Universidad de Magallanes, Casilla 113-D, Punta Arenas, Chile

    Claudia Andrade & Carlos Ríos

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  1. Claudia Andrade
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Correspondence to Claudia Andrade.

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Andrade, C., Ríos, C., Gerdes, D. et al. Trophic structure of shallow-water benthic communities in the sub-Antarctic Strait of Magellan. Polar Biol 39, 2281–2297 (2016). https://doi.org/10.1007/s00300-016-1895-0

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Keywords

  • Benthic communities
  • Functional guilds
  • Isotopic niche
  • Magellan Strait
  • Stable isotope
  • Subpolar
  • Trophic ecology