Introduction of Mysis relicta (Mysida) reduces niche segregation between deep-water Arctic charr morphs
Knudsen, R., Eloranta, A., Siwertsson, A., Paterson, R. A., Power, M., & Sandlund, O. T. (2019). Introduction of Mysis relicta (Mysida) reduces niche segregation between deep-water Arctic charr morphs. Hydrobiologia, 840(1), 245-260. https://doi.org/10.1007/s10750-019-3953-4
© Springer Nature Switzerland AG 2019
Niche diversification of polymorphic Arctic charr can be altered by multiple anthropogenic stressors. The opossum-shrimp (Mysis relicta) was introduced to compensate for reduced food resources for fish following hydropower operations in Lake Limingen, central Norway. Based on habitat use, stomach contents, stable isotopes (δ13C, δ15N) and trophically transmitted parasites, the zooplanktivorous upper water-column dwelling ‘normal’ morph was clearly trophically separated from two sympatric deep-water morphs (the ‘dwarf’ and the ‘grey’) that became more abundant with depth (> 30 m). Mysis dominated (50–60%) charr diets in deeper waters (> 30 m), irrespective of morph. Mysis and/or zooplankton prey groups caused high dietary overlap (> 54%) between the ‘dwarf’ morph and the two other ‘normal’ and ‘grey’ morphs. After excluding Mysis, the dietary overlap dropped to 34% between the two profundal morphs, as the ‘dwarf’ fed largely on deep-water zoobenthos (39%), while the ‘grey’ morph fed on fish (59%). The time-integrated trophic niche tracers (trophically transmitted parasites and stable isotopes) demonstrated only partial dietary segregation between the two deep-water morphs. The high importance of Mysis in Arctic charr diets may have reduced the ancestral niche segregation between the deep-water morphs and thereby increased their resource competition and potential risk of hybridization. ...
PublisherKluwer Academic Publishers; Springer Netherlands
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Additional information about fundingThe investigations in Limingen in 2016 were supported by NTE (Nord-Trøndelag Elektrisitetsverk—Energi) and the Norwegian Environment Agency (the Fish in Large Lakes component of the program Surveillance Monitoring of Large Lakes), with additional funding from NINA (Norwegian Institute for Nature Research), and UiT (The Arctic University of Norway). RAP was supported by the European Union’s Horizon 2020 Research and Innovation Program (Marie Skłodowska-Curie grant agreement no. 663830). The gill netting was done by Laila Saksgård and Oskar Pettersen, NINA, and Aslak D. Sjursen, NTNU University Museum. Cesilie Bye, Laina Dalsbø and Karin Strand Johanessen, from the Freshwater Ecology group, UiT The Arctic University of Norway assisted with fish dissection and sampling. We thank these colleagues for their help in field and laboratory, and also the two anonymous reviewers for their helpful feedback on an earlier draft of the manuscript. ...
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