Temporal and spatial variation in the δ15N and δ13C values of fish and squid from Alaskan waters

Kurle, Carolyn M.; Sinclair, Elizabeth H.; Edwards, Ann E.; Gudmundson, Carolyn J.

doi:10.1007/s00227-011-1741-4

Cited by 40 publications

(35 citation statements)

References 65 publications

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“…The present study validates the fact that isotopic values of fish vary depending upon the species 13 (Figure 1a). Strikingly distinct δ 13 C and δ 15 N values were obtained for hairtail fish of different origin.…”

Section: ■ Discussionsupporting

confidence: 89%

Utility of Stable Isotope and Cytochrome Oxidase I Gene Sequencing Analyses in Inferring Origin and Authentication of Hairtail Fish and Shrimp

Kim¹,

Kumar²,

Sy³

et al. 2015

J. Agric. Food Chem.

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Mislabeling of fishery products continues to be a serious threat to the global market. Consequently, there is an urgent necessity to develop tools for authenticating and establishing their true origin. This investigation evaluates the suitability of stable isotopes and cytochrome oxidase I (COI) sequencing in identifying and tracing the origin of hairtail fish and shrimp. By use of COI sequencing, the hairtail fish samples were identified as Trichiurus japonicus and Trichiurus lepturus, while the shrimp samples were identified as Pandalus borealis, Marsupenaeus japonicus, Fenneropenaeus chinensis, Litopenaeus vannamei, Penaeus monodon, and Solenocera crassicornis. Linear discriminant analysis (LDA) of stable isotopes further categorized the individuals of the same species based on the country of origin. Natural and farmed shrimp (from the same country) were distinctly differentiated on the basis of stable isotope values. Therefore, these two methods could be cooperatively utilized to identify and authenticate fishery products, the utilization of which would enhance transparency and fair trade.

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Section: ■ Discussionsupporting

confidence: 89%

Utility of Stable Isotope and Cytochrome Oxidase I Gene Sequencing Analyses in Inferring Origin and Authentication of Hairtail Fish and Shrimp

Kim¹,

Kumar²,

Sy³

et al. 2015

J. Agric. Food Chem.

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“…Tissues were cleaned with water (except blood components), freeze-dried for 24 hours, and lipids were removed from the rat tissues and all diet items (except the individual oil samples) using petroleum ether [27,28] in a Dionex ASE-200 Accelerated Solvent Extractor. Petroleum ether does not remove proteinaceous material and therefore does not affect δ 15 N values [27,29]. Samples were ground to a powder using a mortar and pestle, 0.7-1.0 mg were sealed into tin capsules, and the δ 13 C and δ 15 N values were determined using a Carlo Erba CE1108 elemental analyser interfaced via a CONFLO III device to a Thermo-Electron Delta Plus XP mass spectrometer at the Stable Isotope Laboratory, University of California Santa Cruz.…”

Section: Methodsmentioning

confidence: 99%

The effects of sex, tissue type, and dietary components on stable isotope discrimination factors (Δ¹³C and Δ¹⁵N) in mammalian omnivores

Kurle

Koch

Tershy

et al. 2014

Isotopes in Environmental and Health Studies

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132

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We tested the effects of sex, tissue, and diet on stable isotope discrimination factors (Δ(13)C and Δ(15)N) for six tissues from rats fed four diets with varied C and N sources, but comparable protein quality and quantity. The Δ(13)C and Δ(15)N values ranged from 1.7-4.1‰ and 0.4-4.3‰, respectively. Females had higher Δ(15)N values than males because males grew larger, whereas Δ(13)C values did not differ between sexes. Differences in Δ(13)C values among tissue types increased with increasing variability in dietary carbon sources. The Δ(15)N values increased with increasing dietary δ(15)N values for all tissues except liver and serum, which have fast stable isotope turnover times, and differences in Δ(15)N values among tissue types decreased with increasing dietary animal protein. Our results demonstrate that variability in dietary sources can affect Δ(13)C values, protein source affects Δ(15)N values even when protein quality and quantity are controlled, and the isotope turnover rate of a tissue can influence the degree to which diet affects Δ(15)N values.

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“…Stable isotope analysis is a powerful tool for trophic investigations, especially for species where stomach content data are unavailable (Kurle & Worthy, 2001;Newsome et al, 2007;Kurle et al, 2011). Diet composition, trophic level and geographic location of feeding can be inferred from isotopic signatures in the tissues of the predator, which reflect the isotopic ratios of its prey (Born et al, 2003;Witteveen et al, 2009a,b).…”

Section: Isotope Studiesmentioning

confidence: 99%

Humpback whale diets respond to variance in ocean climate and ecosystem conditions in the California Current

Fleming

Clark

Calambokidis

et al. 2015

Global Change Biology

130

137

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Large, migratory predators are often cited as sentinel species for ecosystem processes and climate-related changes, but their utility as indicators is dependent upon an understanding of their response to environmental variability. Documentation of the links between climate variability, ecosystem change and predator dynamics is absent for most top predators. Identifying species that may be useful indicators and elucidating these mechanistic links provides insight into current ecological dynamics and may inform predictions of future ecosystem responses to climatic change. We examine humpback whale response to environmental variability through stable isotope analysis of diet over a dynamic 20-year period (1993-2012) in the California Current System (CCS). Humpback whale diets captured two major shifts in oceanographic and ecological conditions in the CCS. Isotopic signatures reflect a diet dominated by krill during periods characterized by positive phases of the North Pacific Gyre Oscillation (NPGO), cool sea surface temperature (SST), strong upwelling and high krill biomass. In contrast, humpback whale diets are dominated by schooling fish when the NPGO is negative, SST is warmer, seasonal upwelling is delayed and anchovy and sardine populations display increased biomass and range expansion. These findings demonstrate that humpback whales trophically respond to ecosystem shifts, and as a result, their foraging behavior is a synoptic indicator of oceanographic and ecological conditions across the CCS. Multi-decadal examination of these sentinel species thus provides insight into biological consequences of interannual climate fluctuations, fundamental to advancing ecosystem predictions related to global climate change.

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Temporal and spatial variation in the δ15N and δ13C values of fish and squid from Alaskan waters

Cited by 40 publications

References 65 publications

Utility of Stable Isotope and Cytochrome Oxidase I Gene Sequencing Analyses in Inferring Origin and Authentication of Hairtail Fish and Shrimp

Utility of Stable Isotope and Cytochrome Oxidase I Gene Sequencing Analyses in Inferring Origin and Authentication of Hairtail Fish and Shrimp

The effects of sex, tissue type, and dietary components on stable isotope discrimination factors (Δ¹³C and Δ¹⁵N) in mammalian omnivores

Humpback whale diets respond to variance in ocean climate and ecosystem conditions in the California Current

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Temporal and spatial variation in the δ15N and δ13C values of fish and squid from Alaskan waters

Cited by 40 publications

References 65 publications

Utility of Stable Isotope and Cytochrome Oxidase I Gene Sequencing Analyses in Inferring Origin and Authentication of Hairtail Fish and Shrimp

Utility of Stable Isotope and Cytochrome Oxidase I Gene Sequencing Analyses in Inferring Origin and Authentication of Hairtail Fish and Shrimp

The effects of sex, tissue type, and dietary components on stable isotope discrimination factors (Δ13C and Δ15N) in mammalian omnivores

Humpback whale diets respond to variance in ocean climate and ecosystem conditions in the California Current

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The effects of sex, tissue type, and dietary components on stable isotope discrimination factors (Δ¹³C and Δ¹⁵N) in mammalian omnivores