tinroИзвестия ТИНРОIzvestiya TINRO1606-99192658-5510ТИНРО10.26428/1606-9919-2021-201-669-685tinro-662Research ArticleУСЛОВИЯ ОБИТАНИЯ ПРОМЫСЛОВЫХ ОБЪЕКТОВENVIRONMENTS OF FISHERIES RESOURCESАнализ профилей стронция и бария, измеренных методом масс-спектрометрии сверхвысокого разрешения LA-ICP-MS в отолитах молоди анадромной нерки Oncorhynchus nerka в раннеморской период, как косвенного показателя перехода из пресных вод в морскиеAnalysis of Sr and Ba profiles measured by ultra-high-resolution mass spectrometry LA-ICP-MS in otoliths of juvenile anadromous sockeye salmon Oncorhynchus nerka in the early marine life-history stage as a proxy for fresh to marine water transitionЕгороваЮ.EgorovaYu.

Егорова Юлия, аспирант

Ванкувер, Британская Колумбия, V6T 1Z4

Egorova Yulia, post-graduate student

2207 Main Mall #2020, Vancouver, BC, V6T 1Z4

yegorova@eoas.ubc.caКузьменкоЮ.KuzmenkoYu.

Кузьменко Юлия, аспирант

Ванкувер, Британская Колумбия, V6T 1Z4

Kuzmenko Yulia, post-graduate student

2207 Main Mall #2020, Vancouver, BC, V6T 1Z4

ykuzmen@eoas.ubc.caСпесивыйТ.SpesivyT.

Спесивый Тимофей, техник

Ванкувер, Британская Колумбия, V6T 1Z4

Spesivy Tymofey, laboratory technician

2207 Main Mall #2020, Vancouver, BC, V6T 1Z4

tim.spesivy@gmail.comХантБ.HuntB. P.V.

Хант Брайан П.В., доцент

Ванкувер, Британская Колумбия, V6T 1Z4Хериот-Бэй, Британская Колумбия, V0P 1H0

Hunt Brian P.V., assistant professor

2207 Main Mall #2020, Vancouver, BC, V6T 1Z4Heriot Bay, BC, V0P 1H0

b.hunt@oceans.ubc.caПахомовЕ. А.PakhomovE. A.

Пахомов Евгений А., кандидат биологических наук, профессор, директор института

Ванкувер, Британская Колумбия, V6T 1Z4Хериот-Бэй, Британская Колумбия, V0P 1H0

Pakhomov Evgeny A., PhD, professor, director of institute

2207 Main Mall #2020, Vancouver, BC, V6T 1Z4Heriot Bay, BC, V0P 1H0

epakhomov@eoas.ubc.caУниверситет Британской КолумбииКанадаUniversity of British ColumbiaCanadaУниверситет Британской Колумбии; Хакай институтКанадаUniversity of British Columbia; Hakai InstituteCanada2021061020212013669685Copyright © Егорова Ю., Кузьменко Ю., Спесивый Т., Хант Б.P., Пахомов Е.А., 20212021Егорова Ю., Кузьменко Ю., Спесивый Т., Хант Б., Пахомов Е.А.Egorova Y., Kuzmenko Y., Spesivy T., Hunt B.P., Pakhomov E.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://izvestiya.tinro-center.ru/jour/article/view/662

Анализируются профили концентраций стронция и бария в отолитах ювенильной нерки Oncorhynchus nerka Британской Колумбии (Канада), определенные методом лазерной масс-спектрометрии с индуктивно-связанной плазмой (LA-ICP-MS). Рассмотрены вариабельность и повторяемость оценок точки перехода лососей в морскую среду по профилям соотношений Sr:Ca и Ba:Ca с максимально возможным (околосуточным) разрешением. Высокая точность анализа химического состава отолитов (по слоям толщиной до 2 мкм) достигнута с применением круговой прорези, ширина которой близка к ширине суточных колец отолитов, что дало возможность проанализировать изменения в элементном составе отолитов при миграции рыбы в морскую среду обитания с точностью в 1–2 дня. Профили стронция в целом были сходны у всех изученных рыб с низкими величинами Sr:Ca в начальный пресноводный период и резким их повышением при переходе в морскую среду. Вариации Ba:Ca были более сложными, с резким ростом перед переходом в соленую воду, кроме того, перед переходом наблюдалось несколько пиков концентрации бария, число которых было разным у рыб разного происхождения. На профиле бария рост концентрации наблюдался на 3–11 мкм раньше, чем на профиле стронция. Сложность профиля бария может привести к ошибке в определении точки перехода в морскую среду, поэтому профиль стронция является более надежным маркером перехода молоди нерки к морскому обитанию.

The strontium (Sr) and barium (Ba) profiles in otoliths of juvenile sockeye salmon Oncorhynchus nerka from British Columbia are measured using a Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) system and analyzed. The highest possible measurement resolution (near-daily) was used to assess variability and repeatability of the breakpoint (marine entry) estimates inferred from Sr:Ca and Ba:Ca ratios. Such resolution for the otolith chemical composition (to an accuracy of 2 μm) was reached using the rotating slit, which width was close to the daily circulus width of the otoliths. So, daily or 2-day changes in the elemental composition were recorded during the period of transition to the marine environment. Sr profiles were generally similar among the fish, starting with low values of Sr:Ca in the fresh water and increasing sharply after the marine entry. The Ba:Ca signal was more complex, showing in most cases a dramatic increase immediately before the breakpoint. Besides, multiple peaks in the Ba profiles were recorded prior to the marine transition with a significant difference of their number between fish from different populations. A breakpoint was detectable in the Ba profiles 3–11 µm prior to its appearance in the Sr profiles. The complexity of Ba profiles may cause erroneous estimates of the marine entry date; thus, the Sr signal is a more reliable marker of marine transition for juvenile sockeye. 

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The authors declare that there are no conflicts of interest present.