Hydrobiologia

, Volume 783, Issue 1, pp 105–115

Food resource partitioning between stream-dwelling Arctic charr Salvelinus alpinus (L.), Atlantic salmon Salmo salar L. and alpine bullhead Cottus poecilopus Heckel, 1836: an example of water column segregation

  • Javier Sánchez-Hernández
  • Heidi-Marie Gabler
  • Per-Arne Amundsen
CHARR II

DOI: 10.1007/s10750-015-2547-z

Cite this article as:
Sánchez-Hernández, J., Gabler, HM. & Amundsen, PA. Hydrobiologia (2016) 783: 105. doi:10.1007/s10750-015-2547-z

Abstract

We assessed the food resource partitioning of three fish species (Arctic charr, Atlantic salmon and alpine bullhead) living in sympatry in a subarctic river. Fish were sampled monthly during the ice-free season (May–October), and dietary overlap among the species was calculated according to Schoener’s index. In October, the diet overlap among all three species was high (>70%). In contrast, large to modest food resource partitioning occurred among Arctic charr and the other two species from May to September (27–59% overlap), whereas there was a distinct diet overlap between Atlantic salmon and alpine bullhead in May, August and September (>64%), but not in July (53%). Surface prey (terrestrial and emerged aquatic insects), probably caught at the surface, were important for Arctic charr in August and September (24.9 and 46.6%, respectively), whereas the other fish species mainly fed on Apatania stigmatella, Mystrophora intermedia and Ephemerella aurivilli. Alpine bullhead seemed to feed close to the bottom, Atlantic salmon used both the bottom and water of various depths, whereas Arctic charr showed the greatest capacity to forage at the water surface. This vertical segregation may be important for fish assemblages in subarctic rivers, allowing food resource partitioning and coexistence of sympatric species.

Keywords

Allochthonous resources Diet overlap Feeding ecology Subarctic rivers Vertical distribution 

Supplementary material

10750_2015_2547_MOESM1_ESM.docx (474 kb)
Supplementary material 1 (DOCX 474 kb)
10750_2015_2547_MOESM2_ESM.docx (478 kb)
Supplementary material 2 (DOCX 477 kb)
10750_2015_2547_MOESM3_ESM.docx (489 kb)
Supplementary material 3 (DOCX 489 kb)
10750_2015_2547_MOESM4_ESM.docx (473 kb)
Supplementary material 4 (DOCX 472 kb)

Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.Department of Arctic and Marine Biology, Faculty of Biosciences, Fisheries and EconomicsUiT The Arctic University of NorwayTromsøNorway
  2. 2.Department of Zoology and Physical Anthropology, Faculty of BiologyUniversity of Santiago de CompostelaSantiago de CompostelaSpain

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