The diet of introduced brook trout (Salvelinus fontinalis; Mitchill, 1814) in an alpine area and a literature review on its feeding ecology

  • Rocco Tiberti | rocco.tiberti@gmail.com Alpine Wildlife Research Centre, Gran Paradiso National Park - Università degli Studi di Pavia, Italy.
  • Stefano Brighenti Alpine Wildlife Research Centre, Gran Paradiso National Park, Italy.
  • Claudia Canedoli Università degli Studi Milano-Bicocca, Italy.
  • Rocco Iacobuzio Università degli Studi di Milano, Italy.
  • Matteo Rolla Swansea University, United Kingdom.

Abstract

Introduced fish are a major threat for high altitude aquatic habitats and Salvelinus fontinalis have been widely used throughout the Alps for stocking lakes and rivers. Understanding its feeding ecology is a basic, but essential tool for interpreting its impact. To assess which factors determine the diet of S. fontinalis we analyzed more than 500 stomachs from several introduced populations from the Gran Paradiso National Park (GPNP, Western Italian Alps) and we measured the availability of several prey groups (zooplankton, aquatic invertebrates, terrestrial invertebrates). We complemented the study with a short, but exhaustive literature review on the S. fontinalis feeding ecology. In general the food composition reflected the availability of prey -confirming that S. fontinalis is an opportunistic predator- and was influenced by habitat type (stream vs lake), fish size, and seasonality. The obtained results were discussed in the light of the existing literature on the feeding ecology and ecological impact of S. fontinalis. Large benthonic insects account for a substantial part of  the diet of stream dwelling brook trout, while they are almost absent both in the diet and in the prey species pool of lake-dwelling brook trout, probably reflecting a stronger ecological impact in the lakes.

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Published
2016-05-03
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Original Articles
Supporting Agencies
Gran Paradiso National Park (FP7 ACQWA Project - Grant 212250), LIFE project BIOAQUAE (LIFE11 BIO/IT/000020).
Keywords:
Stomach content, alpine rivers, alpine lakes, prey availability, Gran Paradiso National Park, LIFE Bioaquae.
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How to Cite
1.
Tiberti R, Brighenti S, Canedoli C, Iacobuzio R, Rolla M. The diet of introduced brook trout (Salvelinus fontinalis; Mitchill, 1814) in an alpine area and a literature review on its feeding ecology. J Limnol [Internet]. 2016May3 [cited 2020Oct.29];75(3). Available from: https://www.jlimnol.it/index.php/jlimnol/article/view/jlimnol.2016.1366