Introduced European minnow Phoxinus phoxinus in alpine lakes may increase total mercury concentration in brown trout Salmo trutta

In Norway, the cyprinid European minnow Phoxinus phoxinus has been spread far outside its previous natural distribution area, with lots of establishments in mountain lakes where brown trout Salmo trutta originally was the only fish species. We have analysed δ15N and total mercury (THg) concentratio...

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Autores principales:	Reidar Borgstrøm, Sigurd Rognerud, Sondre Meland, Bjørn Olav Rosseland
Formato:	article
Lenguaje:	EN
Publicado:	Norwegian University of Science and Technology 2021
Materias:	THg concentration, trophic level, δ15N, piscivory, prey fish Zoology QL1-991
Acceso en línea:	https://doaj.org/article/7ff028ec76694de0a468f60d441b6a73
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spelling	oai:doaj.org-article:7ff028ec76694de0a468f60d441b6a732021-12-01T14:25:09ZIntroduced European minnow Phoxinus phoxinus in alpine lakes may increase total mercury concentration in brown trout Salmo trutta10.5324/fn.v41i0.39671502-48731891-5396https://doaj.org/article/7ff028ec76694de0a468f60d441b6a732021-11-01T00:00:00Zhttps://www.ntnu.no/ojs/index.php/fauna_norvegica/article/view/3967https://doaj.org/toc/1502-4873https://doaj.org/toc/1891-5396 In Norway, the cyprinid European minnow Phoxinus phoxinus has been spread far outside its previous natural distribution area, with lots of establishments in mountain lakes where brown trout Salmo trutta originally was the only fish species. We have analysed δ15N and total mercury (THg) concentration in brown trout from eight lakes, situated between 1031 and 1244 m a.s.l. on the Hardangervidda mountain plateau, southern Norway. One of the lakes is inhabited by brown trout and European minnow, while in the other seven lakes, brown trout is the only fish species. δ15N of brown trout were significantly higher in the population with co-existing European minnow, indicating a higher trophic position of brown trout in this population than in the allopatric populations, probably caused by piscivory, as indicated by frequent occurrence of European minnow in brown trout diet. The mercury concentrations in brown trout from this lake had values up to around 0.4 mg THg per kg wet weight. The concentrations were significantly higher than in the lakes without European minnow, and together with the δ15N values, indicating that translocation and establishment of European minnow may increase the trophic position of brown trout in previously allopatric populations, and thereby also increase the mercury level. Reidar BorgstrømSigurd RognerudSondre MelandBjørn Olav RosselandNorwegian University of Science and TechnologyarticleTHg concentration, trophic level, δ15N, piscivory, prey fishZoologyQL1-991ENFauna Norvegica, Vol 41 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	THg concentration, trophic level, δ15N, piscivory, prey fish Zoology QL1-991
spellingShingle	THg concentration, trophic level, δ15N, piscivory, prey fish Zoology QL1-991 Reidar Borgstrøm Sigurd Rognerud Sondre Meland Bjørn Olav Rosseland Introduced European minnow Phoxinus phoxinus in alpine lakes may increase total mercury concentration in brown trout Salmo trutta
description	In Norway, the cyprinid European minnow Phoxinus phoxinus has been spread far outside its previous natural distribution area, with lots of establishments in mountain lakes where brown trout Salmo trutta originally was the only fish species. We have analysed δ15N and total mercury (THg) concentration in brown trout from eight lakes, situated between 1031 and 1244 m a.s.l. on the Hardangervidda mountain plateau, southern Norway. One of the lakes is inhabited by brown trout and European minnow, while in the other seven lakes, brown trout is the only fish species. δ15N of brown trout were significantly higher in the population with co-existing European minnow, indicating a higher trophic position of brown trout in this population than in the allopatric populations, probably caused by piscivory, as indicated by frequent occurrence of European minnow in brown trout diet. The mercury concentrations in brown trout from this lake had values up to around 0.4 mg THg per kg wet weight. The concentrations were significantly higher than in the lakes without European minnow, and together with the δ15N values, indicating that translocation and establishment of European minnow may increase the trophic position of brown trout in previously allopatric populations, and thereby also increase the mercury level.
format	article
author	Reidar Borgstrøm Sigurd Rognerud Sondre Meland Bjørn Olav Rosseland
author_facet	Reidar Borgstrøm Sigurd Rognerud Sondre Meland Bjørn Olav Rosseland
author_sort	Reidar Borgstrøm
title	Introduced European minnow Phoxinus phoxinus in alpine lakes may increase total mercury concentration in brown trout Salmo trutta
title_short	Introduced European minnow Phoxinus phoxinus in alpine lakes may increase total mercury concentration in brown trout Salmo trutta
title_full	Introduced European minnow Phoxinus phoxinus in alpine lakes may increase total mercury concentration in brown trout Salmo trutta
title_fullStr	Introduced European minnow Phoxinus phoxinus in alpine lakes may increase total mercury concentration in brown trout Salmo trutta
title_full_unstemmed	Introduced European minnow Phoxinus phoxinus in alpine lakes may increase total mercury concentration in brown trout Salmo trutta
title_sort	introduced european minnow phoxinus phoxinus in alpine lakes may increase total mercury concentration in brown trout salmo trutta
publisher	Norwegian University of Science and Technology
publishDate	2021
url	https://doaj.org/article/7ff028ec76694de0a468f60d441b6a73
work_keys_str_mv	AT reidarborgstrøm introducedeuropeanminnowphoxinusphoxinusinalpinelakesmayincreasetotalmercuryconcentrationinbrowntroutsalmotrutta AT sigurdrognerud introducedeuropeanminnowphoxinusphoxinusinalpinelakesmayincreasetotalmercuryconcentrationinbrowntroutsalmotrutta AT sondremeland introducedeuropeanminnowphoxinusphoxinusinalpinelakesmayincreasetotalmercuryconcentrationinbrowntroutsalmotrutta AT bjørnolavrosseland introducedeuropeanminnowphoxinusphoxinusinalpinelakesmayincreasetotalmercuryconcentrationinbrowntroutsalmotrutta
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Introduced European minnow Phoxinus phoxinus in alpine lakes may increase total mercury concentration in brown trout Salmo trutta

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