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...
Main Authors: | , , , , , |
---|---|
Format: | Text |
Language: | English |
Published: |
2019
|
Subjects: | |
Online Access: | http://hdl.handle.net/11250/2596607 |
id |
ftninstnf:oai:brage.nina.no:11250/2596607 |
---|---|
record_format |
openpolar |
spelling |
ftninstnf:oai:brage.nina.no:11250/2596607 2023-05-15T14:30:01+02:00 Introduction of Mysis relicta (Mysida) reduces niche segregation between deep-water Arctic charr morphs Knudsen, Rune Eloranta, Antti Siwertsson, Anna Paterson, Rachel A. Power, Michael Sandlund, Odd Terje Limingen, Røyrvik, Lierne, Norge, Noreg, Norway 2019 application/octet-stream http://hdl.handle.net/11250/2596607 eng eng http://hdl.handle.net/11250/2596607 ©Springer Nature Switzerland AG 2019 Hydrobiologia Salvelinus alpinus Polymorphism Ecological divergence Species introductions Hydropower effects Parasite community Stable isotopes VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 Peer reviewed 2019 ftninstnf 2021-12-23T07:17:18Z 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 (d13C, d15N) andtrophically 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 deepwater 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. Text Arctic charr Arctic Salvelinus alpinus Zooplankton Norwegian Institute for Nature Research: Brage NINA Arctic Limingen ENVELOPE(13.746,13.746,64.706,64.706) Norway |
institution |
Open Polar |
collection |
Norwegian Institute for Nature Research: Brage NINA |
op_collection_id |
ftninstnf |
language |
English |
topic |
Salvelinus alpinus Polymorphism Ecological divergence Species introductions Hydropower effects Parasite community Stable isotopes VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 |
spellingShingle |
Salvelinus alpinus Polymorphism Ecological divergence Species introductions Hydropower effects Parasite community Stable isotopes VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 Knudsen, Rune Eloranta, Antti Siwertsson, Anna Paterson, Rachel A. Power, Michael Sandlund, Odd Terje Introduction of Mysis relicta (Mysida) reduces niche segregation between deep-water Arctic charr morphs |
topic_facet |
Salvelinus alpinus Polymorphism Ecological divergence Species introductions Hydropower effects Parasite community Stable isotopes VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 |
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 (d13C, d15N) andtrophically 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 deepwater 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 |
Text |
author |
Knudsen, Rune Eloranta, Antti Siwertsson, Anna Paterson, Rachel A. Power, Michael Sandlund, Odd Terje |
author_facet |
Knudsen, Rune Eloranta, Antti Siwertsson, Anna Paterson, Rachel A. Power, Michael Sandlund, Odd Terje |
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 |
publishDate |
2019 |
url |
http://hdl.handle.net/11250/2596607 |
op_coverage |
Limingen, Røyrvik, Lierne, Norge, Noreg, Norway |
long_lat |
ENVELOPE(13.746,13.746,64.706,64.706) |
geographic |
Arctic Limingen Norway |
geographic_facet |
Arctic Limingen Norway |
genre |
Arctic charr Arctic Salvelinus alpinus Zooplankton |
genre_facet |
Arctic charr Arctic Salvelinus alpinus Zooplankton |
op_source |
Hydrobiologia |
op_relation |
http://hdl.handle.net/11250/2596607 |
op_rights |
©Springer Nature Switzerland AG 2019 |
_version_ |
1766303945525821440 |