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Polar Biology

, Volume 38, Issue 10, pp 1613–1622 | Cite as

Spatial variation in the diet of Patagonotothen tessellata (Pisces, Nototheniidae) from the fjords and channels of southern Chilean Patagonia

  • Mathias HüneEmail author
  • Rodrigo Vega
Original Paper

Abstract

The black southern cod, Patagonotothen tessellata, is the most important notothenioid fish species in terms of abundance in southern Chilean Patagonia. However, studies on its trophic ecology are scarce. Here we assessed the spatial variation in the diet of P. tessellata between two localities, one with oceanic influence (Staples Strait) and another with continental influence (Puerto Bories). We used permutation analysis combined with non-metric multi-dimensional scaling to evaluate spatial differences in diet. In addition, generalized additive models were used to identify the most significant environmental, biological and spatial predictors of variability in diet. The black southern cod presents spatial differences in diet composition among contrasting environmental localities. The diet in Staples Strait was characterized by the dominance of the polychaete Platynereis australis, whereas diet in Puerto Bories was characterized by crustaceans, mainly ostracods, gammarids and algae, mainly the filamentous green alga Rhizoclonium sp. and the red algae Polysiphonia sp. Diet composition did not show significant difference between sexes, whereas diet of small, medium and large fish differed to some degree. Smaller-sized P. tessellata were most likely to contain food. Salinity and temperature had significant influence on diet variability, suggesting that P. tessellata showed a greater diversity of prey items in environmental conditions with greater temperature and lower salinity. The results provide evidence of two dietary patterns depending on the type of environment in which they are distributed, highlighting the potential role of the environmental variables on the availability and abundance of potential prey and in structuring diet.

Keywords

Patagonotothen Feeding habits Southern Patagonia ice fields Magellan region 

Notes

Acknowledgments

The authors would like to express their gratitude to Gladys Rivera, José Sánchez and Pedro Contreras for the onsite and logistic support.

Supplementary material

300_2015_1726_MOESM1_ESM.pdf (105 kb)
Supplementary material 1 (PDF 105 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Fundación IctiológicaProvidenciaChile
  2. 2.Instituto de Ecología y Biodiversidad (IEB)SantiagoChile
  3. 3.Instituto de Fomento PesqueroValparaisoChile

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