Introduction of Mysis relicta (Mysida) reduces niche segregation between deep-water Arctic charr morphs
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 co...
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Springer Verlag
2019
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Online Access: | https://orca.cardiff.ac.uk/id/eprint/121623/ https://doi.org/10.1007/s10750-019-3953-4 https://orca.cardiff.ac.uk/id/eprint/121623/1/Knudsen_ORCA_08042019.pdf |
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:121623 2023-12-17T10:23:26+01:00 Introduction of Mysis relicta (Mysida) reduces niche segregation between deep-water Arctic charr morphs Knudsen, Rune Eloranta, Antti P Siwertsson, Anna Paterson, Rachel A Power, Michael Terje Sandlund, Odd 2019-09-01 application/pdf https://orca.cardiff.ac.uk/id/eprint/121623/ https://doi.org/10.1007/s10750-019-3953-4 https://orca.cardiff.ac.uk/id/eprint/121623/1/Knudsen_ORCA_08042019.pdf en eng Springer Verlag https://orca.cardiff.ac.uk/id/eprint/121623/1/Knudsen_ORCA_08042019.pdf Knudsen, Rune, Eloranta, Antti P, Siwertsson, Anna, Paterson, Rachel A, Power, Michael and Terje Sandlund, Odd 2019. Introduction of Mysis relicta (Mysida) reduces niche segregation between deep-water Arctic charr morphs. Hydrobiologia 840 (1) , pp. 245-260. 10.1007/s10750-019-3953-4 https://doi.org/10.1007/s10750-019-3953-4 file https://orca.cardiff.ac.uk/id/eprint/121623/1/Knudsen_ORCA_08042019.pdf doi:10.1007/s10750-019-3953-4 Article PeerReviewed 2019 ftunivcardiff https://doi.org/10.1007/s10750-019-3953-4 2023-11-23T23:33:53Z 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. Article in Journal/Newspaper Arctic Arctic charr Arctic Zooplankton Cardiff University: ORCA (Online Research @ Cardiff) Arctic Limingen ENVELOPE(13.746,13.746,64.706,64.706) Norway Hydrobiologia 840 1 245 260 |
institution |
Open Polar |
collection |
Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Knudsen, Rune Eloranta, Antti P Siwertsson, Anna Paterson, Rachel A Power, Michael Terje Sandlund, Odd |
spellingShingle |
Knudsen, Rune Eloranta, Antti P Siwertsson, Anna Paterson, Rachel A Power, Michael Terje Sandlund, Odd Introduction of Mysis relicta (Mysida) reduces niche segregation between deep-water Arctic charr morphs |
author_facet |
Knudsen, Rune Eloranta, Antti P Siwertsson, Anna Paterson, Rachel A Power, Michael Terje Sandlund, Odd |
author_sort |
Knudsen, Rune |
title |
Introduction of Mysis relicta (Mysida) reduces niche segregation between deep-water Arctic charr morphs |
title_short |
Introduction of Mysis relicta (Mysida) reduces niche segregation between deep-water Arctic charr morphs |
title_full |
Introduction of Mysis relicta (Mysida) reduces niche segregation between deep-water Arctic charr morphs |
title_fullStr |
Introduction of Mysis relicta (Mysida) reduces niche segregation between deep-water Arctic charr morphs |
title_full_unstemmed |
Introduction of Mysis relicta (Mysida) reduces niche segregation between deep-water Arctic charr morphs |
title_sort |
introduction of mysis relicta (mysida) reduces niche segregation between deep-water arctic charr morphs |
publisher |
Springer Verlag |
publishDate |
2019 |
url |
https://orca.cardiff.ac.uk/id/eprint/121623/ https://doi.org/10.1007/s10750-019-3953-4 https://orca.cardiff.ac.uk/id/eprint/121623/1/Knudsen_ORCA_08042019.pdf |
long_lat |
ENVELOPE(13.746,13.746,64.706,64.706) |
geographic |
Arctic Limingen Norway |
geographic_facet |
Arctic Limingen Norway |
genre |
Arctic Arctic charr Arctic Zooplankton |
genre_facet |
Arctic Arctic charr Arctic Zooplankton |
op_relation |
https://orca.cardiff.ac.uk/id/eprint/121623/1/Knudsen_ORCA_08042019.pdf Knudsen, Rune, Eloranta, Antti P, Siwertsson, Anna, Paterson, Rachel A, Power, Michael and Terje Sandlund, Odd 2019. Introduction of Mysis relicta (Mysida) reduces niche segregation between deep-water Arctic charr morphs. Hydrobiologia 840 (1) , pp. 245-260. 10.1007/s10750-019-3953-4 https://doi.org/10.1007/s10750-019-3953-4 file https://orca.cardiff.ac.uk/id/eprint/121623/1/Knudsen_ORCA_08042019.pdf doi:10.1007/s10750-019-3953-4 |
op_doi |
https://doi.org/10.1007/s10750-019-3953-4 |
container_title |
Hydrobiologia |
container_volume |
840 |
container_issue |
1 |
container_start_page |
245 |
op_container_end_page |
260 |
_version_ |
1785557807786885120 |