Using stable isotopes to infer stock‐specific high‐seas distribution of maturing sockeye salmon in the North Pacific

Espinasse, Boris; Hunt, Brian P. V.; Finney, Bruce P.; Fryer, Jeffrey K.; Бугаев, А. В.; Pakhomov, Evgeny A.

doi:10.1002/ece3.7022

Cited by 6 publications

(3 citation statements)

References 65 publications

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“…The Importantly, the models developed in this work are effectively averaging over any ontogenetic (French et al, 1976;Myers et al, 2016;Neave et al, 1976) and stock-specific (Espinasse et al, 2020;McKinnell et al, 1997;Shelton et al, 2021;Urawa et al, 2009;Weitkamp & Neely, 2002) distribution patterns, which may themselves be related to differences in temperature preferences among ages and populations, that complicates effective prediction of spatial responses to climate variation. The distribution models and temperature preferences estimated here are intended to represent general basin-wide patterns for each species that can act as a new baseline from which to develop investigations into the influences of F I G U R E 5 Change in thermal habitat suitability scores by month (rows) and species (columns), calculated using the SST effect curves estimated in Model 3 standardized to a [0,1] scale, between mean sea surface temperature conditions matching a cold (1983)(1984)(1985)(1986) and warm (2013-2016) period for sockeye (left), chum (middle) and coho (right) salmon.…”

Section: Discussionmentioning

confidence: 99%

Opening the black box: New insights into the role of temperature in the marine distributions of Pacific salmon

Langan,

Cunningham,

Watson

et al. 2024

Fish and Fisheries

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Pacific salmon (Oncorhynchus spp.) spend much of their life near the ocean surface where climatic and oceanographic conditions affect their habitat and survival. Despite decades of study, critical knowledge gaps persist regarding their ecology and distributions. Consequently, it has been difficult to assess how environmental conditions influence the high‐seas distribution and habitat use of these culturally and socioeconomically important fishes, presenting challenges to fisheries managers trying to evaluate how climate change and fishing activities may impact salmon populations. We used a recently compiled, comprehensive database of historical coastal and high‐seas salmon survey data (1953–2022) in the North Pacific to fit species distribution models that (1) characterize the marine spatial distribution of six species of Oncorhynchus, (2) evaluate species‐specific temperature preferences, and (3) investigate how species' temperature preferences influence distribution. Sea surface temperature, along with seasonal migrations associated with spawning and feeding, significantly affects the distribution of all species, where the warm limits of estimated preferred thermal ranges were more similar than the cold limits. Furthermore, the distributions of some species appear more responsive to temperature than others and recently observed warm conditions have likely impacted realized ranges. These models have expanded our understanding of salmon ocean distributions and thermal niches by providing a unique window into this often unobserved but important part of the life cycle. They also serve as a baseline for future investigations into the mechanisms influencing salmon spatial ecology, responses to climate change, and vulnerability to harvest across the North Pacific.

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Section: Discussionmentioning

confidence: 99%

Opening the black box: New insights into the role of temperature in the marine distributions of Pacific salmon

Langan,

Cunningham,

Watson

et al. 2024

Fish and Fisheries

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“…on the spectral data. Savitzky Golay (SG) [ 42 ] smoothing was usually applied to improve the signal-to-noise ratio (SNR) and to decrease the noise of the original spectra. In this research, SG9 smoothing (three filter windows with a filter width of nine points) was employed to boost NIR resolution and lessen background and baseline.…”

Section: Methodsmentioning

confidence: 99%

Fingerprint Approaches Coupled with Chemometrics to Discriminate Geographic Origin of Imported Salmon in China’s Consumer Market

Hong

Liao

et al. 2021

Foods

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Of the salmon sold in China’s consumer market, 92% was labelled as Norwegian salmon, but was in fact was mainly imported from Chile. The aim of this study was to establish an effective method for discriminating the geographic origin of imported salmon using two fingerprint approaches, Near-infrared (NIR) spectroscopy and mineral element fingerprint (MEF). In total, 80 salmon (40 from Norway and 40 from Chile) were tested, and data generated by NIR and MEF were analysed via various chemometrics. Four spectral preprocessing methods, including vector normalization (VN), Savitzky Golay (SG) smoothing, first derivative (FD) and second derivative (SD), were employed on the raw NIR data, and a partial least squares (PLS) model based on the FD + SG9 pretreatment could successfully differentiate Norwegian salmons from Chilean salmons, with a R2 value of 98.5%. Analysis of variance (ANOVA) and multiple comparative analysis were employed on the contents of 16 mineral elements including Pb, Fe, Cu, Zn, Al, Sr, Ni, As, Cr, V, Se, Mn, K, Ca, Na and Mg. The results showed that Fe, Zn, Al, Ni, As, Cr, V, Se, Ca and Na could be used as characteristic elements to discriminate the geographical origin of the imported salmon, and the discrimination rate of the linear discriminant analysis (LDA) model, trained on the above 10 elements, could reach up to 98.8%. The results demonstrate that both NIR and MEF could be effective tools for the rapid discrimination of geographic origin of imported salmon in China’s consumer market.

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“…Notably, the isoscapes should preferentially be based on consistent observational data, i.e., isotopic compositions of materials or organisms that belong to similar trophic level, and these individuals should be situated low enough in the food webs that most predators can be compared to them. Particulate organic matter (Kurle and Mcwhorter, 2017;Seyboth et al, 2018;St John Glew et al, 2021), jellyfish (Mackenzie et al, 2014;St John Glew et al, 2019), zooplankton composition or individuals (Brault et al, 2018;Espinasse et al, 2020b;Matsubayashi et al, 2020) have been used in previous studies to produce large spatial scale isoscapes. A balance needs to be found between the quality (spatiotemporal resolution, consistence in analysing, and sampling procedure among samples) and the quantity of data.…”

Section: Model Structure and Isoscape Limitationsmentioning

confidence: 99%

Temporal dynamics in zooplankton δ13C and δ15N isoscapes for the North Atlantic Ocean: Decadal cycles, seasonality, and implications for predator ecology

Espinasse

Sturbois²,

Basedow³

et al. 2022

Front. Ecol. Evol.

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The limited amount of ecological data covering offshore parts of the ocean impedes our ability to understand and anticipate the impact of anthropogenic stressors on pelagic marine ecosystems. Isoscapes, i.e., spatial models of the distribution of stable isotope ratios, have been employed in the recent years to investigate spatio-temporal patterns in biogeochemical process and ecological responses. Development of isoscapes on the scale of ocean basins is hampered by access to suitable reference samples. Here we draw on archived material from long-running plankton survey initiatives, to build temporally explicit isoscape models for the North Atlantic Ocean (> 40°N). A total of 570 zooplankton samples were retrieved from Continuous Plankton Recorder archives and analysed for δ13C and δ15N values. Bayesian generalised additive models were developed to (1) model the relations between isotopic values and a set of predictors and (2) predict isotopic values for the whole of the study area. We produced yearly and seasonal isoscape models for the period 1998–2020. These are the first observation-based time-resolved C and N isoscapes developed at the scale of the North Atlantic Ocean. Drawing on the Stable Isotope Trajectory Analysis framework, we identify five isotopically distinct regions. We discuss the hydro-biogeochemical processes that likely explain theses modes, the differences in temporal dynamics (stability and cycles) and compare our results with previous bioregionalization efforts. Finally, we lay down the basis for using the isoscapes as a tool to define predator distributions and their interactions with the trophic environment. The isoscapes developed in this study have the potential to update our knowledge of marine predator ecology and therefore our capacity to improve their conservation in the future.

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Using stable isotopes to infer stock‐specific high‐seas distribution of maturing sockeye salmon in the North Pacific

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 6 publications

References 65 publications

Opening the black box: New insights into the role of temperature in the marine distributions of Pacific salmon

Opening the black box: New insights into the role of temperature in the marine distributions of Pacific salmon

Fingerprint Approaches Coupled with Chemometrics to Discriminate Geographic Origin of Imported Salmon in China’s Consumer Market

Temporal dynamics in zooplankton δ13C and δ15N isoscapes for the North Atlantic Ocean: Decadal cycles, seasonality, and implications for predator ecology

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