Estimating migration patterns of fish from otolith chemical composition time-series

Understanding migration patterns and habitat use is of great importance for management and conservation of marine living resources. The chemical composition of otoliths is influenced by the surrounding environment; therefore, they are indispensable data archives. To extract migration patterns and hi...

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Bibliographic Details
Published in:Canadian Journal of Fisheries and Aquatic Sciences
Main Authors: Albertsen, Christoffer Moesgaard, Hüssy, Karin, Hansen Serre, Simon, Hansen, Jakob Hemmer, Thomsen, Tonny Bernt
Format: Article in Journal/Newspaper
Language:English
Published: 2021
Subjects:
Habitat use
Microchemistry
Movement
Otolith
State-space model
Strontium
/dk/atira/pure/sustainabledevelopmentgoals/life_below_water
name=SDG 14 - Life Below Water
atlantic cod
Gadus morhua
Online Access:https://orbit.dtu.dk/en/publications/4c3514e8-e39b-4429-97ab-589c478b7c0b
https://doi.org/10.1139/cjfas-2020-0356
https://backend.orbit.dtu.dk/ws/files/244458515/albertsen2021a_postprint_orbit.pdf
Description
Summary:Understanding migration patterns and habitat use is of great importance for management and conservation of marine living resources. The chemical composition of otoliths is influenced by the surrounding environment; therefore, they are indispensable data archives. To extract migration patterns and historical habitat use of individual fish, we analyse otolith chemical compositions obtained by laser ablation inductively coupled plasma mass spectrometry by a regime-switching state-space model. The state-space model filters the measurement noise from the environmental signal. In turn, the filtered signal is converted to geographical positions through a calibration of strontium to salinity. The method is validated by a simulation study and applied to 404 Atlantic cod ( Gadus morhua ) otoliths.

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