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New insights into the autecology of the two sympatric fish species Notothenia coriiceps and N. rossii from western Antarctic Peninsula : a trophic biomarkers approach

Eugenia Moreira, Manuel Novillo, Katja Mintenbeck, Gastón Alurralde, Esteban Barrera-Oro and Marleen De Troch (UGent)
(2021) POLAR BIOLOGY. 44(8). p.1591-1603
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Abstract
Biomarker analysis, especially fatty acids (FA) and stable isotopes (SI), has become a useful tool to elucidate the flow of energy and trophic interactions in an ecosystem and to analyse the diet of species that are hard to observe whilst feeding. Herein we compare FA profiles and SI composition (nitrogen, delta N-15 and carbon, delta C-13) of muscle tissue from two sympatric Antarctic fish species-Notothenia rossii and N. coriiceps-that are key components in the inshore ecosystem of the South Shetland Islands. For both nototheniids, potential benthic food sources (algae, amphipods, polychaetes and gastropods) were screened in order to re-evaluate their trophic position (TP) and the energy flow. Significant differences in FA and SI composition between the two fish species were found. Notothenia rossii showed a higher total FA concentration, with high levels of polyunsaturated FA. Conversely, the potential food sources tested showed low concentrations of these FAs. This could indicate that both nototheniids are feeding mainly on another food source or that FA bioconversion takes place. While the FA results might suggest a possible trophic niche segregation between N. rossii and N. coriiceps, both species occupy a similar trophic position. Furthermore, we found a 50-times higher total concentration of monounsaturated FA in N. rossii than in N. coriiceps that can be related to the higher buoyancy capacity of the former. Trophic biomarkers did not elucidate the main prey item as lipid source for N. rossii and N. coriiceps, suggesting that other food sources and potential fatty acid bioconversion should be further investigated.
Keywords
Nototheniid fish, Fatty acids, Stable isotopes, Diet, South Shetland Islands, Antarctica, SOUTH-SHETLAND ISLANDS, FATTY-ACID COMPOSITION, FOOD-WEB, POTTER COVE, STABLE ISOTOPES, DIETARY OVERLAP, MARINE, ECOLOGY, CARBON, NICHE

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MLA
Moreira, Eugenia, et al. “New Insights into the Autecology of the Two Sympatric Fish Species Notothenia Coriiceps and N. Rossii from Western Antarctic Peninsula : A Trophic Biomarkers Approach.” POLAR BIOLOGY, vol. 44, no. 8, 2021, pp. 1591–603, doi:10.1007/s00300-021-02903-7.
APA
Moreira, E., Novillo, M., Mintenbeck, K., Alurralde, G., Barrera-Oro, E., & De Troch, M. (2021). New insights into the autecology of the two sympatric fish species Notothenia coriiceps and N. rossii from western Antarctic Peninsula : a trophic biomarkers approach. POLAR BIOLOGY, 44(8), 1591–1603. https://doi.org/10.1007/s00300-021-02903-7
Chicago author-date
Moreira, Eugenia, Manuel Novillo, Katja Mintenbeck, Gastón Alurralde, Esteban Barrera-Oro, and Marleen De Troch. 2021. “New Insights into the Autecology of the Two Sympatric Fish Species Notothenia Coriiceps and N. Rossii from Western Antarctic Peninsula : A Trophic Biomarkers Approach.” POLAR BIOLOGY 44 (8): 1591–1603. https://doi.org/10.1007/s00300-021-02903-7.
Chicago author-date (all authors)
Moreira, Eugenia, Manuel Novillo, Katja Mintenbeck, Gastón Alurralde, Esteban Barrera-Oro, and Marleen De Troch. 2021. “New Insights into the Autecology of the Two Sympatric Fish Species Notothenia Coriiceps and N. Rossii from Western Antarctic Peninsula : A Trophic Biomarkers Approach.” POLAR BIOLOGY 44 (8): 1591–1603. doi:10.1007/s00300-021-02903-7.
Vancouver
1.
Moreira E, Novillo M, Mintenbeck K, Alurralde G, Barrera-Oro E, De Troch M. New insights into the autecology of the two sympatric fish species Notothenia coriiceps and N. rossii from western Antarctic Peninsula : a trophic biomarkers approach. POLAR BIOLOGY. 2021;44(8):1591–603.
IEEE
[1]
E. Moreira, M. Novillo, K. Mintenbeck, G. Alurralde, E. Barrera-Oro, and M. De Troch, “New insights into the autecology of the two sympatric fish species Notothenia coriiceps and N. rossii from western Antarctic Peninsula : a trophic biomarkers approach,” POLAR BIOLOGY, vol. 44, no. 8, pp. 1591–1603, 2021.
@article{8724878,
  abstract     = {{Biomarker analysis, especially fatty acids (FA) and stable isotopes (SI), has become a useful tool to elucidate the flow of energy and trophic interactions in an ecosystem and to analyse the diet of species that are hard to observe whilst feeding. Herein we compare FA profiles and SI composition (nitrogen, delta N-15 and carbon, delta C-13) of muscle tissue from two sympatric Antarctic fish species-Notothenia rossii and N. coriiceps-that are key components in the inshore ecosystem of the South Shetland Islands. For both nototheniids, potential benthic food sources (algae, amphipods, polychaetes and gastropods) were screened in order to re-evaluate their trophic position (TP) and the energy flow. Significant differences in FA and SI composition between the two fish species were found. Notothenia rossii showed a higher total FA concentration, with high levels of polyunsaturated FA. Conversely, the potential food sources tested showed low concentrations of these FAs. This could indicate that both nototheniids are feeding mainly on another food source or that FA bioconversion takes place. While the FA results might suggest a possible trophic niche segregation between N. rossii and N. coriiceps, both species occupy a similar trophic position. Furthermore, we found a 50-times higher total concentration of monounsaturated FA in N. rossii than in N. coriiceps that can be related to the higher buoyancy capacity of the former. Trophic biomarkers did not elucidate the main prey item as lipid source for N. rossii and N. coriiceps, suggesting that other food sources and potential fatty acid bioconversion should be further investigated.}},
  author       = {{Moreira, Eugenia and Novillo, Manuel and Mintenbeck, Katja and Alurralde, Gastón and Barrera-Oro, Esteban and De Troch, Marleen}},
  issn         = {{0722-4060}},
  journal      = {{POLAR BIOLOGY}},
  keywords     = {{Nototheniid fish,Fatty acids,Stable isotopes,Diet,South Shetland Islands,Antarctica,SOUTH-SHETLAND ISLANDS,FATTY-ACID COMPOSITION,FOOD-WEB,POTTER COVE,STABLE ISOTOPES,DIETARY OVERLAP,MARINE,ECOLOGY,CARBON,NICHE}},
  language     = {{eng}},
  number       = {{8}},
  pages        = {{1591--1603}},
  title        = {{New insights into the autecology of the two sympatric fish species Notothenia coriiceps and N. rossii from western Antarctic Peninsula : a trophic biomarkers approach}},
  url          = {{http://doi.org/10.1007/s00300-021-02903-7}},
  volume       = {{44}},
  year         = {{2021}},
}
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