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Wang D, Wu G, Tian J, Li C, Liu J, Liang L, Qiu G. Efficient acid hydrolysis for compound-specific δ 15N analysis of amino acids for determining trophic positions. ENVIRONMENTAL RESEARCH 2024; 256:119223. [PMID: 38810830 DOI: 10.1016/j.envres.2024.119223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Revised: 05/22/2024] [Accepted: 05/23/2024] [Indexed: 05/31/2024]
Abstract
Compound-specific isotope analysis of nitrogen in amino acids (CSIA-AA, δ15NAA) has gained increasing popularity for elucidating energy flow within food chains and determining the trophic positions of various organisms. However, there is a lack of research on the impact of hydrolysis conditions, such as HCl concentration and hydrolysis time, on δ15NAA analysis in biota samples. In this study, we investigated two HCl concentrations (6 M and 12 M) and four hydrolysis times (2 h, 6 h, 12 h, and 24 h) for hydrolyzing and derivatizing AAs in reference materials (Tuna) and biological samples of little egret (n = 4), night heron (n = 4), sharpbelly (n = 4) and Algae (n = 1) using the n-pivaloyl-iso-propyl (NPIP) ester approach. A Dowex cation exchange resin was used to purify amino acids before derivatization. We then determined δ15NAA values using gas chromatography-combustion-isotope ratio mass spectrometry (GC-C-IRMS). The results revealed no significant differences (p > 0.05) in δ15NAA values among samples treated with different HCl concentrations or hydrolysis times, particularly for δ15NGlx (range: 21.0-23.5‰) and δ15NPhe (range: 4.3-5.4‰) in Tuna (12 M). Trophic positions (TPs) calculated based on δ15NAA at 2 h (little egret: 2.9 ± 0.1, night heron: 2.8 ± 0.1, sharpbelly: 2.0 ± 0.1 and Algae: 1.3 ± 0.2) were consistent with those at 24 h (3.1 ± 0.1, 2.8 ± 0.1, 2.2 ± 0.1 and 1.1 ± 0.1, respectively), suggesting that a 2-h hydrolysis time and a 6 M HCl concentration are efficient pretreatment conditions for determining δ15NAA and estimating TP. Compared to the currently used hydrolysis conditions (24 h, 6 M), the proposed conditions (2 h, 6 M) accelerated the δ15NAA assay, making it faster, more convenient, and more efficient. Further research is needed to simplify the operational processes and reduce the time costs, enabling more efficient applications of CSIA-AA.
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Affiliation(s)
- Dawei Wang
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Gaoen Wu
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, 570228, China
| | - Jing Tian
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China
| | - Chan Li
- School of Ecology and Environmental Science, Yunnan University, Kunming, 650091, China
| | - Jiemin Liu
- Guizhou Provincial People's Hospital, China
| | - Longchao Liang
- School of Chemistry and Material Science, Guizhou Normal University, Guiyang, 550025, China
| | - Guangle Qiu
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China.
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Harris AJT, Santos GM, Malone KO, Van Der Meer MTJ, Riekenberg P, Fernandes R. A long-term study of stable isotope ratios of fingernail keratin and amino acids in a mother-infant dyad. AMERICAN JOURNAL OF BIOLOGICAL ANTHROPOLOGY 2024:e25021. [PMID: 39192684 DOI: 10.1002/ajpa.25021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2024] [Revised: 07/13/2024] [Accepted: 08/14/2024] [Indexed: 08/29/2024]
Abstract
OBJECTIVE To evaluate the potential of compound-specific isotope analysis of amino acids (CSIA-AA) for investigating infant feeding practices, we conducted a long-term study that compared infant and maternal amino acid (AA) nitrogen isotope ratios. MATERIALS AND METHODS Fingernail samples were collected from a single mother-infant dyad over 19 months postpartum. Carbon and nitrogen stable isotope ratios were measured in the bulk keratin of the fingernail samples. Selected samples were then hydrolyzed and derivatized for compound-specific nitrogen isotope analysis of keratin AAs. RESULTS As in previous studies, infant bulk keratin nitrogen isotope values increased during exclusive breastfeeding and fell with the introduction of complementary foods and eventual cessation of breastfeeding. Infant trophic AAs had elevated nitrogen isotope values relative to the mother, while the source AAs were similar between the mother and infant. Proline and threonine appeared to track the presence of human milk in the infant's diet as the isotopic composition of these AAs remained offset from maternal isotope values until the cessation of breastfeeding. DISCUSSION Although CSIA-AA is costly and labor intensive, it appears to hold potential for estimating the duration of breastfeeding, even after the introduction of complementary foods. Through the analysis of a full suite of AAs, it may also yield insights into infant physiology and AA synthesis.
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Affiliation(s)
- Alison J T Harris
- Department of Archaeology, Max Planck Institute of Geoanthropology, Jena, Germany
- Department of Archaeology, Memorial University of Newfoundland and Labrador, St. John's, Canada
| | - Guaciara M Santos
- Keck Carbon Cycle AMS Facility, University of California Irvine, Irvine, California, USA
| | - Kaelyn O Malone
- Keck Carbon Cycle AMS Facility, University of California Irvine, Irvine, California, USA
| | - Marcel T J Van Der Meer
- Marine Microbiology and Biogeochemistry Department, NIOZ Royal Netherlands Institute for Sea Research, Den Burg, The Netherlands
| | - Philip Riekenberg
- Marine Microbiology and Biogeochemistry Department, NIOZ Royal Netherlands Institute for Sea Research, Den Burg, The Netherlands
| | - Ricardo Fernandes
- Department of Archaeology, Max Planck Institute of Geoanthropology, Jena, Germany
- Department of Bioarchaeology, Faculty of Archaeology, University of Warsaw, Warsaw, Poland
- Arne Faculty of Arts, Masaryk University, Brno, Czechia
- Climate Change and History Research Initiative, Princeton University, Princeton, New Jersey, USA
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McMahon KW. Lipid extraction alters amino acid composition and bulk, but not amino acid, carbon and nitrogen isotope values. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2024; 38:e9848. [PMID: 38890542 DOI: 10.1002/rcm.9848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Revised: 04/17/2024] [Accepted: 05/15/2024] [Indexed: 06/20/2024]
Abstract
RATIONALE Concerns exist over observed shifts in value and variance of nitrogen isotopes following physicochemical extraction of lipids from organic matter. The mechanisms behind these apparent changes in bulk tissue δ15N values are not fully understood yet have major implications for analytical costs and integrity of data interpretations. METHODS Changes in proximate analysis, amino acid composition, C:N ratios, bulk tissue and amino acid δ13C and δ15N values, and resulting isotope-based food web metrics were compared between lipid-intact and lipid-extracted muscle tissue of fishes spanning <1% to >20% muscle fat content to identify mechanisms of nitrogen isotope fractionation associated with physicochemical lipid extraction. RESULTS Bulk δ13C and δ15N values increased and %N, C:N ratios and crude protein content decreased following lipid extraction. Resulting bulk isotope niche spacing and overlap varied significantly between lipid-intact and lipid-extracted tissues. While amino acid composition significantly changed during lipid extraction, particularly for lipid-associated amino acids (e.g., Glu, Lys, Ser), individual amino acid δ13C and δ15N values, and their associated compound-specific isotope analysis of amino acids (CSIA-AA)-based food web metrics, did not. CONCLUSIONS Physicochemical lipid extraction caused significant tissue composition changes (e.g., leaching of amino acids and 15N-deplete nitrogenous waste) that affected δ13C and δ15N values and tissue %C and %N beyond simply removing lipids. However, lipid extraction did not alter individual amino acid δ13C or δ15N values or their associated CSIA-AA-based food web metrics.
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Affiliation(s)
- Kelton W McMahon
- Graduate School of Oceanography, University of Rhode Island, Narragansett, RI, USA
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4
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Matthews CJD, Yarnes CT, Lefort KJ, Edkins TL, Kiszka JJ, Ferguson SH. Dietary plasticity and broad North Atlantic origins inferred from bulk and amino acid-specific δ 15N and δ 13C favour killer whale range expansions into Arctic waters. J Anim Ecol 2024; 93:1049-1064. [PMID: 38956826 DOI: 10.1111/1365-2656.14123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2024] [Accepted: 05/07/2024] [Indexed: 07/04/2024]
Abstract
Killer whales (Orcinus orca) occur seasonally in the eastern Canadian Arctic (ECA), where their range expansion associated with declining sea ice have raised questions about the impacts of increasing killer whale predation pressure on Arctic-endemic prey. We assessed diet and distribution of ECA killer whales using bulk and compound-specific stable isotope analysis (CSIA) of amino acids (AA) of 54 skin biopsies collected from 2009 to 2020 around Baffin Island, Canada. Bulk ECA killer whale skin δ15N and δ13C values did not overlap with potential Arctic prey after adjustment for trophic discrimination, and instead reflected foraging history in the North Atlantic prior to their arrival in the ECA. Adjusted killer whale stable isotope (SI) values primarily overlapped with several species of North Atlantic baleen whales or tuna. Amino acid (AA)-specific δ15N values indicated the ECA killer whales fed primarily on marine mammals, having similar glutamic acid δ15N-phenylalanine δ15N (δ15NGlx-Phe) and threonine δ15N (δ15NThr) as mammal-eating killer whales from the eastern North Pacific (ENP) that served as a comparative framework. However, one ECA whale grouped with the fish-eating ENP ecotype based δ15NThr. Distinctive essential AA δ13C of ECA killer whale groups, along with bulk SI similarity to killer whales from different regions of the North Atlantic, indicates different populations converge in Arctic waters from a broad source area. Generalist diet and long-distance dispersal capacity favour range expansions, and integration of these insights will be critical for assessing ecological impacts of increasing killer whale predation pressure on Arctic-endemic species.
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Affiliation(s)
- Cory J D Matthews
- Arctic Aquatic Research Division, Fisheries and Oceans Canada, 501 University Crescent, Winnipeg, Manitoba, Canada
| | - Chris T Yarnes
- Stable Isotope Facility, University of California, Davis, California, USA
| | - Kyle J Lefort
- Fisheries and Oceans Canada, St John's, Newfoundland, Canada
| | - Tera L Edkins
- Arctic Aquatic Research Division, Fisheries and Oceans Canada, 501 University Crescent, Winnipeg, Manitoba, Canada
| | - Jeremy J Kiszka
- Institute of Environment, Department of Biological Sciences, Florida International University, North Miami, Florida, USA
| | - Steven H Ferguson
- Arctic Aquatic Research Division, Fisheries and Oceans Canada, 501 University Crescent, Winnipeg, Manitoba, Canada
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Young HS, McCauley FO, Micheli F, Dunbar RB, McCauley DJ. Shortened food chain length in a fished versus unfished coral reef. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2024; 34:e3002. [PMID: 38840322 DOI: 10.1002/eap.3002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 02/23/2024] [Accepted: 04/09/2024] [Indexed: 06/07/2024]
Abstract
Direct exploitation through fishing is driving dramatic declines of wildlife populations in ocean environments, particularly for predatory and large-bodied taxa. Despite wide recognition of this pattern and well-established consequences of such trophic downgrading on ecosystem function, there have been few empirical studies examining the effects of fishing on whole system trophic architecture. Understanding these kinds of structural impacts is especially important in coral reef ecosystems-often heavily fished and facing multiple stressors. Given the often high dietary flexibility and numerous functional redundancies in diverse ecosystems such as coral reefs, it is important to establish whether web architecture is strongly impacted by fishing pressure or whether it might be resilient, at least to moderate-intensity pressure. To examine this question, we used a combination of bulk and compound-specific stable isotope analyses measured across a range of predatory and low-trophic-level consumers between two coral reef ecosystems that differed with respect to fishing pressure but otherwise remained largely similar. We found that even in a high-diversity system with relatively modest fishing pressure, there were strong reductions in the trophic position (TP) of the three highest TP consumers examined in the fished system but no effects on the TP of lower-level consumers. We saw no evidence that this shortening of the affected food webs was being driven by changes in basal resource consumption, for example, through changes in the spatial location of foraging by consumers. Instead, this likely reflected internal changes in food web architecture, suggesting that even in diverse systems and with relatively modest pressure, human harvest causes significant compressions in food chain length. This observed shortening of these food webs may have many important emergent ecological consequences for the functioning of ecosystems impacted by fishing or hunting. Such important structural shifts may be widespread but unnoticed by traditional surveys. This insight may also be useful for applied ecosystem managers grappling with choices about the relative importance of protection for remote and pristine areas and the value of strict no-take areas to protect not just the raw constituents of systems affected by fishing and hunting but also the health and functionality of whole systems.
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Affiliation(s)
- Hillary S Young
- Department of Ecology, Evolution and Marine Biology, UC Santa Barbara, Santa Barbara, California, USA
| | | | - Fiorenza Micheli
- Oceans Department, Hopkins Marine Station, and Stanford Center for Ocean Solutions, Stanford University, Pacific Grove, California, USA
| | - Robert B Dunbar
- Oceans Department and Earth Systems Science, Stanford University, Pacific Grove, California, USA
| | - Douglas J McCauley
- Department of Ecology, Evolution and Marine Biology, UC Santa Barbara, Santa Barbara, California, USA
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Canseco JA, Niklitschek EJ, Quezada-Romegialli C, Yarnes C, Harrod C. Comparing trophic position estimates using bulk and compound specific stable isotope analyses: applying new approaches to mackerel icefish Champsocephalus gunnari. PeerJ 2024; 12:e17372. [PMID: 38770096 PMCID: PMC11104342 DOI: 10.7717/peerj.17372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Accepted: 04/18/2024] [Indexed: 05/22/2024] Open
Abstract
Quantifying the tropic position (TP) of an animal species is key to understanding its ecosystem function. While both bulk and compound-specific analyses of stable isotopes are widely used for this purpose, few studies have assessed the consistency between and within such approaches. Champsocephalus gunnari is a specialist teleost that predates almost exclusively on Antarctic krill Euphausia superba. This well-known and nearly constant trophic relationship makes C. gunnari particularly suitable for assessing consistency between TP methods under field conditions. In the present work, we produced and compared TP estimates for C. gunnari and its main prey using a standard bulk and two amino acid-specific stable isotope approaches (CSI-AA). One based on the difference between glutamate and phenylalanine (TPGlx-Phe), and the other on the proline-phenylalanine difference (TPPro-Phe). To do that, samples from C. gunnari, E. superba and four other pelagic invertebrate and fish species, all potential prey for C.gunnari, were collected off the South Orkney Islands between January and March 2019, analyzed using standard isotopic ratio mass spectrometry methods and interpreted following a Bayesian approach. Median estimates (CI95%) for C. gunnari were similar between TPbulk (3.6; CI95%: 3.0-4.8) and TPGlx-Phe(3.4; CI95%:3.2-3.6), and lower for TPPro-Phe (3.1; CI95%:3.0-3.3). TP differences between C. gunnari and E. superba were 1.4, 1.1 and 1.2, all compatible with expectations from the monospecific diet of this predator (ΔTP=1). While these results suggest greater accuracy for Glx-Phe and Pro-Phe, differences observed between both CSI-AA approaches suggests these methods may require further validation before becoming a standard tool for trophic ecology.
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Affiliation(s)
- Jose Antonio Canseco
- Centro Oceanográfico de Cádiz, Instituto Español de Oceanografía, Cádiz, Cádiz, Spain
| | | | - Claudio Quezada-Romegialli
- Plataforma de Monitoreo Genómico y Ambiental, Departamento de Química, Facultad de Ciencias, Universidad de Tarapacá, Tarapaca, Tarapaca, Chile
| | - Chris Yarnes
- Stable Isotope Facility, UC Davis, Davis, CA, United States of America
| | - Chris Harrod
- Instituto de Ciencias Naturales Alexander Von Humboldt, Universidad de Antofagasta, Antofagasta, Antofagasta, Chile
- Nucleo Milenio Invasal, Concepcion, Biobio, Chile
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7
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Matthews CJD, Smith EAE, Ferguson SH. Comparison of δ 13C and δ 15N of ecologically relevant amino acids among beluga whale tissues. Sci Rep 2024; 14:11146. [PMID: 38750037 PMCID: PMC11096183 DOI: 10.1038/s41598-024-59307-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Accepted: 04/09/2024] [Indexed: 05/18/2024] Open
Abstract
Ecological applications of compound-specific stable isotope analysis (CSIA) of amino acids (AAs) include 1) tracking carbon pathways in food webs using essential AA (AAESS) δ13C values, and 2) estimating consumer trophic position (TP) by comparing relative differences of 'trophic' and 'source' AA δ15N values. Despite the significance of these applications, few studies have examined AA-specific SI patterns among tissues with different AA compositions and metabolism/turnover rates, which could cause differential drawdown of body AA pools and impart tissue-specific isotopic fractionation. To address this knowledge gap, especially in the absence of controlled diet studies examining this issue in captive marine mammals, we used a paired-sample design to compare δ13C and δ15N values of 11 AAs in commonly sampled tissues (skin, muscle, and dentine) from wild beluga whales (Delphinapterus leucas). δ13C of two AAs, glutamic acid/glutamine (Glx, a non-essential AA) and, notably, threonine (an essential AA), differed between skin and muscle. Furthermore, δ15N of three AAs (alanine, glycine, and proline) differed significantly among the three tissues, with glycine δ15N differences of approximately 10 ‰ among tissues supporting recent findings it is unsuitable as a source AA. Significant δ15N differences in AAs such as proline, a trophic AA used as an alternative to Glx in TP estimation, highlight tissue selection as a potential source of error in ecological applications of CSIA-AA. Amino acids that differed among tissues play key roles in metabolic pathways (e.g., ketogenic and gluconeogenic AAs), pointing to potential physiological applications of CSIA-AA in studies of free-ranging animals. These findings underscore the complexity of isotopic dynamics within tissues and emphasize the need for a nuanced approach when applying CSIA-AA in ecological research.
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Affiliation(s)
- Cory J D Matthews
- Fisheries and Oceans Canada, 501 University Crescent, Winnipeg, MB, Canada.
| | - Emma A Elliott Smith
- National Museum of Natural History, Smithsonian Institution, Washington, DC, USA
| | - Steven H Ferguson
- Fisheries and Oceans Canada, 501 University Crescent, Winnipeg, MB, Canada
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Moubtahij Z, McCormack J, Bourgon N, Trost M, Sinet-Mathiot V, Fuller BT, Smith GM, Temming H, Steinbrenner S, Hublin JJ, Bouzouggar A, Turner E, Jaouen K. Isotopic evidence of high reliance on plant food among Later Stone Age hunter-gatherers at Taforalt, Morocco. Nat Ecol Evol 2024; 8:1035-1045. [PMID: 38684738 DOI: 10.1038/s41559-024-02382-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Accepted: 03/01/2024] [Indexed: 05/02/2024]
Abstract
The transition from hunting-gathering to agriculture stands as one of the most important dietary revolutions in human history. Yet, due to a scarcity of well-preserved human remains from Pleistocene sites, little is known about the dietary practices of pre-agricultural human groups. Here we present the isotopic evidence of pronounced plant reliance among Late Stone Age hunter-gatherers from North Africa (15,000-13,000 cal BP), predating the advent of agriculture by several millennia. Employing a comprehensive multi-isotopic approach, we conducted zinc (δ66Zn) and strontium (87Sr/86Sr) analysis on dental enamel, bulk carbon (δ13C) and nitrogen (δ15N) and sulfur (δ34S) isotope analysis on dentin and bone collagen, and single amino acid analysis on human and faunal remains from Taforalt (Morocco). Our results unequivocally demonstrate a substantial plant-based component in the diets of these hunter-gatherers. This distinct dietary pattern challenges the prevailing notion of high reliance on animal proteins among pre-agricultural human groups. It also raises intriguing questions surrounding the absence of agricultural development in North Africa during the early Holocene. This study underscores the importance of investigating dietary practices during the transition to agriculture and provides insights into the complexities of human subsistence strategies across different regions.
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Affiliation(s)
- Zineb Moubtahij
- Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany.
- Géosciences Environnement Toulouse, UMR 5563, CNRS, Observatoire Midi Pyrénées, Toulouse, France.
| | - Jeremy McCormack
- Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
- Goethe University Frankfurt, Institute of Geosciences, Frankfurt am Main, Germany
| | - Nicolas Bourgon
- Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
- IsoTROPIC Research Group, Max Planck Institute for Geoanthropology, Jena, Germany
| | - Manuel Trost
- Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
| | - Virginie Sinet-Mathiot
- Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
- PACEA, UMR 5199, CNRS, Université de Bordeaux, Ministère de la Culture, Pessac, France
- CBMN, UMR 5248 and Bordeaux Proteome Platform, Bordeaux INP, CNRS, Université de Bordeaux, Bordeaux, France
| | - Benjamin T Fuller
- Géosciences Environnement Toulouse, UMR 5563, CNRS, Observatoire Midi Pyrénées, Toulouse, France
| | - Geoff M Smith
- Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
- School of Anthropology and Conservation, University of Kent, Canterbury, UK
| | - Heiko Temming
- Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
| | - Sven Steinbrenner
- Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
| | - Jean-Jacques Hublin
- Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
- Chaire de Paléoanthropologie, CIRB (UMR 7241-U1050), Collège de France, Paris, France
| | - Abdeljalil Bouzouggar
- Institut National des Sciences de l'Archéologie et du Patrimoine, Origin and Evolution of Homo Sapiens Cultures, Rabat, Morocco
- Department of Archaeogenetics, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
| | - Elaine Turner
- Monrepos Archaeological Research Centre and Museum for Human Behavioural Evolution, LEIZA, Neuwied, Germany
| | - Klervia Jaouen
- Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
- Géosciences Environnement Toulouse, UMR 5563, CNRS, Observatoire Midi Pyrénées, Toulouse, France
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Ayayee PA, Petersen N, Riusch J, Rauter C, Larsen T. Enhanced gut microbiome supplementation of essential amino acids in Diploptera punctata fed low-protein plant-based diet. FRONTIERS IN INSECT SCIENCE 2024; 4:1396984. [PMID: 38711463 PMCID: PMC11073486 DOI: 10.3389/finsc.2024.1396984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Accepted: 04/09/2024] [Indexed: 05/08/2024]
Abstract
Introduction Building on our previous work, we investigate how dietary shifts affect gut microbial essential amino acid (EAA) provisioning in the lactating cockroach Diploptera punctata. Method To that end, we fed cockroaches three distinct diets: a plant-only Gari diet composed of starchy and granulated root tuber Yucca (Manihot esculenta), a dog food diet (DF), and a cellulose-amended dog food (CADF) diet. We anticipated that the high carbohydrate, low protein Gari would highlight increased microbial EAA supplementation to the host. Results By day 28, we observed distinct profiles of 14 bacterial families in the insect gut microbiomes of the three dietary groups. CADF-fed insects predominantly harbored cellulolytic and nitrogen-fixing bacteria families Streptococcaceae and Xanthomonadaceae. In contrast, Gari-fed insects were enriched in anaerobic lignocellulolytic bacteria families Paludibacteraceae and Dysgonomonadaceae, while DF-fed insects had a prevalence of proteolytic anaerobes Williamwhitmaniaceae and sulfate-reducing bacteria Desulfovibrionaceae. Furthermore, we confirmed significantly higher EAA supplementation in Gari-fed insects than in non-Gari-fed insects based on δ13C-EAA offsets between insect and their diets. The δ13C-EAA offsets between DF and CADF were nearly indistinguishable, highlighting the relevance of using the plant-based Gari in this experiment to unequivocally demonstrate this function in this insect. These results were underscored by lower standard metabolic rate (SMR) relative to the DF insect in Gari-fed (intermediate SMR and dietary quality) and CADF (least SMR and dietary quality) insects. Discussion The influence of diet on EAA provisioning and SMR responses in insects underscores the need for further exploration into the role of gut microbial functions in modulating metabolic responses.
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Affiliation(s)
- Paul A. Ayayee
- Department of Biology, University of Nebraska Omaha, Omaha, NE, United States
| | - Nick Petersen
- Department of Biology, University of Nebraska Omaha, Omaha, NE, United States
| | - Jennifer Riusch
- Department of Entomology, Insectary, BioSci Greenhouse, Ohio State University, Columbus, OH, United States
| | - Claudia Rauter
- Department of Biology, University of Nebraska Omaha, Omaha, NE, United States
| | - Thomas Larsen
- Department of Archeology, Max Planck Institute of Geoanthropology, Jena, Germany
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Athaillah Z, Yarnes C, Wang SC. Bulk and Compound-Specific Stable Isotope Analysis for the Authentication of Walnuts ( Juglans regia) Origins. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71. [PMID: 37917953 PMCID: PMC10655176 DOI: 10.1021/acs.jafc.3c03770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 10/06/2023] [Accepted: 10/10/2023] [Indexed: 11/04/2023]
Abstract
Walnuts are grown in various countries, and as product origin information is becoming more important to consumers, new techniques to differentiate walnut geographical authenticity are needed. We conducted bulk stable isotope analysis (BSIA) and compound-specific stable isotope analysis (CSIA) on walnuts grown in seven countries. The BSIA consisted of δ13Cbulk, δ15Nbulk, and δ34Sbulk, and CSIA covered δ2Hfatty acid, δ13Cfatty acid, δ13Camino acid, δ15Namino acid, and δ2Hamino acid. Analysis of variance (ANOVA) and linear discriminant analysis (LDA) were used for statistical analysis to compare samples from the USA and China. Parameters that yielded significant variations are δ2HC18:1n-9, δ13CC18:2n-6, δ13CC18:3n-3, δ13CGly, δ13CLeu, δ13CVal, δ2HGlu, δ2HIle, δ2HLeu, and δ2HThr. Our findings suggested that CSIA of fatty acids and amino acids can be useful to differentiate the geographical provenance of walnuts.
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Affiliation(s)
- Zatil
A. Athaillah
- Food
Science and Technology Department of University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Chris Yarnes
- Stable
Isotope Facility of University of California, Davis, Davis, California 95616, United States
| | - Selina C. Wang
- Food
Science and Technology Department of University of California, Davis, One Shields Avenue, Davis, California 95616, United States
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Jiang YY, Zeng YH, Lu RF, Guan KL, Qi XM, Feng Q, Long L, Zhang YT, Zheng X, Luo XJ, Mai BX. Trophic Transfer of Halogenated Organic Pollutants in a Wetland Food Web: Insights from Compound-Specific Nitrogen Isotope of Amino Acids and Food Source Analysis. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:16585-16594. [PMID: 37842981 DOI: 10.1021/acs.est.3c05844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2023]
Abstract
A trophic position (TP) model (TPmix model) that simultaneously considered trophic discrimination factor and βGlu/Phe variations was developed in this study and was first applied to investigate the trophic transfer of halogenated organic pollutants (HOPs) in wetland food webs. The TPmix model characterized the structure of the wetland food web more accurately and significantly improved the reliability of TMF compared to the TPbulk, TPAAs, and TPsimmr models, which were calculated based on the methods of stable nitrogen isotope analysis of bulk, traditional AAs-N-CSIA, and weighted βGlu/Phe, respectively. Food source analysis revealed three interlocking food webs (kingfisher, crab, and frogs) in this wetland. The highest HOP biomagnification capacities (TMFmix) were found in the kingfisher food web (0.24-82.0), followed by the frog (0.08-34.0) and crab (0.56-11.7) food webs. The parabolic trends of TMFmix across combinations of log KOW in the frog food web were distinct from those of aquatic food webs (kingfisher and crab), which may be related to differences in food web composition and HOP bioaccumulation behaviors between aquatic and terrestrial organisms. This study provides a new tool to accurately study the trophic transfer of contaminants in wetlands and terrestrial food webs with diverse species and complex feeding relationships.
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Affiliation(s)
- Yi-Ye Jiang
- State Key Laboratory of Organic Geochemistry and Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yan-Hong Zeng
- State Key Laboratory of Organic Geochemistry and Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
- Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
- CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China
| | - Rui-Feng Lu
- State Key Laboratory of Organic Geochemistry and Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ke-Lan Guan
- State Key Laboratory of Organic Geochemistry and Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xue-Meng Qi
- State Key Laboratory of Organic Geochemistry and Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qunjie Feng
- State Key Laboratory of Organic Geochemistry and Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ling Long
- State Key Laboratory of Organic Geochemistry and Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yan-Ting Zhang
- State Key Laboratory of Organic Geochemistry and Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaobo Zheng
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
| | - Xiao-Jun Luo
- State Key Laboratory of Organic Geochemistry and Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
- Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
- CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China
| | - Bi-Xian Mai
- State Key Laboratory of Organic Geochemistry and Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
- Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
- CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China
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12
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Sun Y, Ogawa NO, Ishikawa NF, Blattmann TM, Takano Y, Ohkouchi N. Application of a porous graphitic carbon column to carbon and nitrogen isotope analysis of underivatized individual amino acids using high-performance liquid chromatography coupled with elemental analyzer/isotope ratio mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2023; 37:e9602. [PMID: 37580505 DOI: 10.1002/rcm.9602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 06/30/2023] [Accepted: 07/03/2023] [Indexed: 08/16/2023]
Abstract
RATIONALE Isolation of underivatized amino acids (AAs) using high-performance liquid chromatography (HPLC) is becoming a popular method for carbon (δ13 C) and nitrogen isotope (δ15 N) analyses of AAs because of the high analytical precision and for performing dual-isotope analysis. However, some AAs in natural samples, especially small, hydrophilic AAs, are not suitably separated using reversed-phase columns (e.g., C18) and ion-exchange columns (e.g., Primesep A). METHODS We developed a new method for HPLC using a porous graphitic carbon column for the separation of nine hydrophilic AAs. After purification, δ13 C and δ15 N values of AAs were determined using elemental analyzer/isotope ratio mass spectrometry (EA/IRMS). We demonstrated the application of this method by determining δ13 C and δ15 N values of individual hydrophilic AAs in a biological sample, the muscle of blue mackerel (Scomber australasicus). RESULTS Chromatographically, the baseline separation of hydrophilic AAs was achieved in both the standard mixture and the biological sample. We confirmed that δ13 C and δ15 N values of AA standards remained unchanged during the whole experimental procedure. The δ13 C values of AAs in mackerel muscle are also in good agreement with the values obtained using another verified method for δ13 C analysis. CONCLUSIONS The good separation performance of hydrophilic AAs and the reliability of δ13 C and δ15 N analyses of individual AAs using the porous graphite column offer a significant advantage over conventional settings. We suggest that, in the future, the HPLC × EA/IRMS method can be used for reliable δ13 C and δ15 N analyses of AAs in natural samples.
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Affiliation(s)
- Yuchen Sun
- Biogeochemistry Research Center (BGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
- Atmosphere and Ocean Research Institute (AORI), The University of Tokyo, Kashiwa, Japan
- Department of Earth and Planetary Science, The University of Tokyo, Tokyo, Japan
| | - Nanako O Ogawa
- Biogeochemistry Research Center (BGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
| | - Naoto F Ishikawa
- Biogeochemistry Research Center (BGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
| | - Thomas M Blattmann
- Biogeochemistry Research Center (BGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
- Geological Institute, ETH Zürich, Zürich, Switzerland
| | - Yoshinori Takano
- Biogeochemistry Research Center (BGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
| | - Naohiko Ohkouchi
- Biogeochemistry Research Center (BGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
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13
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Jiang Y, Zeng Y, Lu R, Zhang Y, Long L, Zheng X, Luo X, Mai B. Application of amino acids nitrogen stable isotopic analysis in bioaccumulation studies of pollutants: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 879:163012. [PMID: 36965734 DOI: 10.1016/j.scitotenv.2023.163012] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Revised: 03/17/2023] [Accepted: 03/18/2023] [Indexed: 05/17/2023]
Abstract
Accurately quantifying trophic positions (TP) to describe food web structure is an important element in studying pollutant bioaccumulation. In recent years, compound-specific nitrogen isotopic analysis of amino acids (AAs-N-CSIA) has been progressively applied as a potentially reliable tool for quantifying TP, facilitating a better understanding of pollutant food web transfer. Therefore, this review provides an overview of the analytical procedures, applications, and limitations of AAs-N-CSIA in pollutant (halogenated organic pollutants (HOPs) and heavy metals) bioaccumulation studies. We first summarize studies on the analytical techniques of AAs-N-CSIA, including derivatization, instrumental analysis, and data processing methods. The N-pivaloyl-i-propyl-amino acid ester method is a more suitable AAs derivatization method for quantifying TP. The AAs-N-CSIA application in pollutant bioaccumulation studies (e.g., Hg, MeHg, and HOPs) is discussed, and its application in conjunction with various techniques (e.g., spatial analysis, food source analysis, and compound tracking techniques, etc.) to research the influence of pollutant levels on organisms is summarized. Finally, the limitations of AAs-N-CSIA in pollutant bioaccumulation studies are discussed, including the use of single empirical values of βglu/phe and TDFglu/phe that result in large errors in TP quantification. The weighted βglu/phe and the multi-TDFglu/phe models are still challenging to solve for accurate TP quantification of omnivores; however, factors affecting the variation of βglu/phe and TDFglu/phe are unclear, especially the effect of pollutant bioaccumulation in organisms on internal AA metabolic processes.
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Affiliation(s)
- Yiye Jiang
- State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yanhong Zeng
- State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China.
| | - Ruifeng Lu
- State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yanting Zhang
- State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ling Long
- State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaobo Zheng
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
| | - Xiaojun Luo
- State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China
| | - Bixian Mai
- State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China
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14
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Identification of endogenous and exogenous semicarbazide (SEM) in crustacea aquatic products using compound-specific nitrogen stable isotope ratio analysis (NSIRA). J Food Compost Anal 2023. [DOI: 10.1016/j.jfca.2023.105257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
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15
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Ecofriendly shiitake authentication using bulk and amino acid-specific stable isotope models. Food Chem 2022; 397:133819. [DOI: 10.1016/j.foodchem.2022.133819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Revised: 07/22/2022] [Accepted: 07/26/2022] [Indexed: 11/20/2022]
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16
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Cheung C, Herrscher E, Thomas A. Compound specific isotope evidence points to use of freshwater resources as weaning food in Middle Neolithic Paris Basin. AMERICAN JOURNAL OF BIOLOGICAL ANTHROPOLOGY 2022. [PMCID: PMC9543897 DOI: 10.1002/ajpa.24591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Objectives Methods Results Conclusions
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Affiliation(s)
- Christina Cheung
- Eco‐anthropologie (EA), Muséum National d'Histoire Naturelle, CNRS Université de Paris Paris France
- CNRS, Minist Culture, LAMPEA Aix Marseille Univ Aix‐en‐Provence France
- Research Unit: Analytical, Environmental & Geo‐Chemistry, Department of Chemistry Vrije Universiteit Brussel Brussels Belgium
| | - Estelle Herrscher
- CNRS, Minist Culture, LAMPEA Aix Marseille Univ Aix‐en‐Provence France
| | - Aline Thomas
- Eco‐anthropologie (EA), Muséum National d'Histoire Naturelle, CNRS Université de Paris Paris France
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17
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Johnson JJ, Shaw PA, Wooller MJ, Venti CA, Krakoff J, Votruba SB, O'Brien DM. Amino Acid Nitrogen Isotope Ratios Respond to Fish and Meat Intake in a 12-Week Inpatient Feeding Study of Men. J Nutr 2022; 152:2031-2038. [PMID: 35511610 PMCID: PMC9445847 DOI: 10.1093/jn/nxac101] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 02/18/2022] [Accepted: 04/28/2022] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND The natural abundance nitrogen stable isotope ratio (NIR) of whole tissue correlates with animal protein intakes, including meat and fish. Amino acid (AA) NIRs (NIRAAs) are more variable than the whole-tissue NIRs and may thus better differentiate among foods. OBJECTIVES We evaluated whether NIRAAs were associated with intakes of fish and meat and whether these dietary associations were larger than with whole-tissue NIRs. METHODS Men were recruited at the National Institute of Diabetes and Digestive and Kidney Diseases in Phoenix, Arizona, and randomly assigned to one of eight 12-wk inpatient dietary interventions, which varied the presence/absence of fish, meat, and sugar-sweetened beverages (SSBs) in all possible combinations. Fasting blood was drawn pre- and postintervention and plasma and RBC NIRAAs (free and protein-bound) were measured as secondary outcomes in 32 participants. Multivariable regression was used to determine responses of postintervention NIRAAs to dietary variables, and logistic regression was used to calculate receiver operating characteristic AUCs. RESULTS Most plasma NIRAAs increased with fish and meat intakes, but to a greater extent with fish intake. The largest increase in response to fish intake was plasma NIRLeucine (β = 2.19, SE = 0.26). The NIRThreonine decreased with both fish and meat intakes. Fewer RBC NIRAAs increased with fish intake, and only RBC NIRProline increased with meat intake. No plasma or RBC NIRAA responded to SSB intake. We identified fish intake with a high degree of accuracy using plasma NIRLeucine (corrected AUC, cAUC = 0.96) and NIRGlutamic acid/glutamine (cAUC = 0.93), and meat intake to a lower degree using plasma NIRProline (cAUC = 0.80) and RBC NIRProline (cAUC = 0.85). CONCLUSIONS Plasma and RBC NIRAAs were associated with fish and meat intakes but were not superior to whole-tissue stable isotope biomarkers in identifying these intakes in a US diet. This trial is registered at www.clinicaltrials.gov as NCT01237093.
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Affiliation(s)
| | - Pamela A Shaw
- Washington Health Research Institute, Kaiser Permanente, Seattle, WA, USA
| | - Matthew J Wooller
- Alaska Stable Isotope Facility, Water and Environmental Research Center, Institute of Northern Engineering, College of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Fairbanks, AK, USA
| | - Colleen A Venti
- Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases/NIH, Phoenix, AZ, USA
| | - Jonathan Krakoff
- Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases/NIH, Phoenix, AZ, USA
| | - Susanne B Votruba
- Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases/NIH, Phoenix, AZ, USA
| | - Diane M O'Brien
- Center for Alaska Native Health Research, Institute of Arctic Biology, Department of Biology and Wildlife, University of Alaska Fairbanks, Fairbanks, AK, USA
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18
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Barceló G, Perrig PL, Dharampal P, Donadio E, Steffan SA, Pauli JN. More than just meat: Carcass decomposition shapes trophic identities in a terrestrial vertebrate. Funct Ecol 2022. [DOI: 10.1111/1365-2435.14041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gonzalo Barceló
- Department of Forest and Wildlife Ecology University of Wisconsin‐Madison Madison WI USA
| | - Paula L. Perrig
- Department of Forest and Wildlife Ecology University of Wisconsin‐Madison Madison WI USA
- Grupo de Investigaciones en Biología de la Conservación INIBIOMA (Universidad Nacional del Comahue ‐ CONICET) Bariloche Argentina
| | | | | | - Shawn A. Steffan
- Department of Entomology University of Wisconsin‐Madison Madison WI USA
- USDA‐ARS Vegetable Crop Research Unit Madison WI USA
| | - Jonathan N. Pauli
- Department of Forest and Wildlife Ecology University of Wisconsin‐Madison Madison WI USA
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19
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Chung IM, Kim YJ, Moon HS, Han JG, Kong WS, Yarnes CT, Kim SH. Improved accuracy of geographical origin identification of shiitake grown in sawdust medium: A compound-specific isotope model-based pilot study. Food Chem 2022; 369:130955. [PMID: 34488129 DOI: 10.1016/j.foodchem.2021.130955] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 08/05/2021] [Accepted: 08/22/2021] [Indexed: 11/29/2022]
Abstract
In countries like South Korea and the USA, origin labeling of shiitake grown using imported Chinese-inoculated medium is an issue. Therefore, we evaluated the use of compound-specific isotope analysis (CSIA) for the accurate identification of the geographical origin of shiitake (Korean, Chinese-inoculated medium, and Chinese); Chinese-inoculated medium shiitake were cultivated in Korea using inoculated sawdust medium from China. The CSIA-discriminant model showed an overall accuracy of 100% in the geographical classification of the original set and 96.4% for the cross-validated set. Glutamate and aspartate δ15N values were the most important variables for differentiating shiitake based on their origins. Compared to that observed upon using the bulk stable isotope analysis, the CSIA model was associated with significantly improved predictability of origin identification. Our findings elucidate the importance of isotope signatures in developing a reliable origin labeling method for shiitake cultured on the sawdust medium for the global market.
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Affiliation(s)
- Ill-Min Chung
- Department of Crop Science, College of Sanghuh Life Science, Konkuk University, Seoul 05029, Republic of Korea
| | - Yun-Ju Kim
- Department of Crop Science, College of Sanghuh Life Science, Konkuk University, Seoul 05029, Republic of Korea
| | - Hee-Sung Moon
- Department of Crop Science, College of Sanghuh Life Science, Konkuk University, Seoul 05029, Republic of Korea
| | - Jae-Gu Han
- National Institutes of Horticultural and Herbal Science, Rural Development Administration, 27709 Eumseong, Republic of Korea
| | - Won-Sik Kong
- National Institutes of Horticultural and Herbal Science, Rural Development Administration, 27709 Eumseong, Republic of Korea
| | - Christopher T Yarnes
- UC Davis Stable Isotope Facility, University of California, Davis, 1 Shields Avenue, Davis, CA 95616, USA
| | - Seung-Hyun Kim
- Department of Crop Science, College of Sanghuh Life Science, Konkuk University, Seoul 05029, Republic of Korea.
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20
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Abstract
Stable isotope analysis of teeth and bones is regularly applied by archeologists and paleoanthropologists seeking to reconstruct diets, ecologies, and environments of past hominin populations. Moving beyond the now prevalent study of stable isotope ratios from bulk materials, researchers are increasingly turning to stable isotope ratios of individual amino acids to obtain more detailed and robust insights into trophic level and resource use. In the present article, we provide a guide on how to best use amino acid stable isotope ratios to determine hominin dietary behaviors and ecologies, past and present. We highlight existing uncertainties of interpretation and the methodological developments required to ensure good practice. In doing so, we hope to make this promising approach more broadly accessible to researchers at a variety of career stages and from a variety of methodological and academic backgrounds who seek to delve into new depths in the study of dietary composition.
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Affiliation(s)
| | - Ricardo Fernandes
- University of Oxford, Oxford, England, United Kingdom, and with the Faculty of Arts at Masaryk University, Czech Republic
| | - Yiming V Wang
- Department of Archaeology, Max Planck Institute for the Science of Human History, Jena, Germany
| | - Patrick Roberts
- School of Social Sciences, University of Queensland, in St Lucia, Queensland, Australia
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21
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Riekenberg PM, Joling T, IJsseldijk LL, Waser AM, van der Meer MTJ, Thieltges DW. Stable nitrogen isotope analysis of amino acids as a new tool to clarify complex parasite–host interactions within food webs. OIKOS 2021. [DOI: 10.1111/oik.08450] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Philip M. Riekenberg
- Dept of Marine Microbiology and Biogeochemistry, NIOZ Royal Netherlands Inst. for Sea Research Texel the Netherlands
| | - Tijs Joling
- Dept of Marine Microbiology and Biogeochemistry, NIOZ Royal Netherlands Inst. for Sea Research Texel the Netherlands
- Dept of Coastal Systems, NIOZ Royal Netherlands Inst. for Sea Research Texel the Netherlands
| | - Lonneke L. IJsseldijk
- Division of Pathology, Dept of Biomolecular Health Sciences, Faculty of Veterinary Medicine, Utrecht Univ. Utrecht the Netherlands
| | - Andreas M. Waser
- Dept of Coastal Systems, NIOZ Royal Netherlands Inst. for Sea Research Texel the Netherlands
- Alfred Wegener Inst., Helmholtz Centre for Polar and Marine Research, Wadden Sea Station Sylt Sylt Germany
| | - Marcel T. J. van der Meer
- Dept of Marine Microbiology and Biogeochemistry, NIOZ Royal Netherlands Inst. for Sea Research Texel the Netherlands
| | - David W. Thieltges
- Dept of Coastal Systems, NIOZ Royal Netherlands Inst. for Sea Research Texel the Netherlands
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22
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Zhang L, Lee WMC, Kreider-Mueller A, Kuhnel E, Baca J, Ji C, Altabet M. High-precision measurement of phenylalanine and glutamic acid δ 15 N by coupling ion-exchange chromatography and purge-and-trap continuous-flow isotope ratio mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2021; 35:e9085. [PMID: 33733521 DOI: 10.1002/rcm.9085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2021] [Revised: 03/12/2021] [Accepted: 03/15/2021] [Indexed: 06/12/2023]
Abstract
RATIONALE Nitrogen isotopic compositions (δ15 N) of source and trophic amino acids (AAs) are crucial tracers of N sources and trophic enrichments in diverse fields, including archeology, astrobiochemistry, ecology, oceanography, and paleo-sciences. The current analytical technique using gas chromatography-combustion-isotope ratio mass spectrometry (GC/C/IRMS) requires derivatization, which is not compatible with some key AAs. Another approach using high-performance liquid chromatography-elemental analyzer-IRMS (HPLC/EA/IRMS) may experience coelution issues with other compounds in certain types of samples, and the highly sensitive nano-EA/IRMS instrumentations are not widely available. METHODS We present a method for high-precision δ15 N measurements of AAs (δ15 N-AA) optimized for canonical source AA-phenylalanine (Phe) and trophic AA-glutamic acid (Glu). This offline approach entails purification and separation via high-pressure ion-exchange chromatography (IC) with automated fraction collection, the sequential chemical conversion of AA to nitrite and then to nitrous oxide (N2 O), and the final determination of δ15 N of the produced N2 O via purge-and-trap continuous-flow isotope ratio mass spectrometry (PT/CF/IRMS). RESULTS The cross-plots of δ15 N of Glu and Phe standards (four different natural-abundance levels) generated by this method and their accepted values have a linear regression slope of 1 and small intercepts demonstrating high accuracy. The precisions were 0.36‰-0.67‰ for Phe standards and 0.27‰-0.35‰ for Glu standards. Our method and the GC/C/IRMS approach produced equivalent δ15 N values for two lab standards (McCarthy Lab AA mixture and cyanobacteria) within error. We further tested our method on a wide range of natural sample matrices and obtained reasonable results. CONCLUSIONS Our method provides a reliable alternative to the current methods for δ15 N-AA measurement as IC or HPLC-based techniques that can collect underivatized AAs are widely available. Our chemical approach that converts AA to N2 O can be easily implemented in laboratories currently analyzing δ15 N of N2 O using PT/CF/IRMS. This method will help promote the use of δ15 N-AA in important studies of N cycling and trophic ecology in a wide range of research areas.
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Affiliation(s)
- Lin Zhang
- Texas A&M University Corpus Christi, Corpus Christi, Texas, USA
| | | | - Ava Kreider-Mueller
- School for Marine Science and Technology, University of Massachusetts Dartmouth, New Bedford, Massachusetts, USA
| | - Evelyn Kuhnel
- Texas A&M University Corpus Christi, Corpus Christi, Texas, USA
| | - Jesus Baca
- Texas A&M University Corpus Christi, Corpus Christi, Texas, USA
| | - Chongxiao Ji
- Texas A&M University Corpus Christi, Corpus Christi, Texas, USA
| | - Mark Altabet
- School for Marine Science and Technology, University of Massachusetts Dartmouth, New Bedford, Massachusetts, USA
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23
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Furtado R, Granadeiro JP, Gatt MC, Rounds R, Horikoshi K, Paiva VH, Menezes D, Pereira E, Catry P. Monitoring of mercury in the mesopelagic domain of the Pacific and Atlantic oceans using body feathers of Bulwer's petrel as a bioindicator. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 775:145796. [PMID: 33618310 DOI: 10.1016/j.scitotenv.2021.145796] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 02/06/2021] [Accepted: 02/07/2021] [Indexed: 06/12/2023]
Abstract
Global mercury pollution has markedly and consistently grown over the past 70 years (although with regional variations in trends) and is a source of major concern. Mercury contamination is particularly prevalent in biota of the mesopelagic layers of the open ocean, but these realms are little studied, and we lack a large scale picture of contamination in living organisms of this region. The Bulwer's petrel Bulweria bulwerii, a species of migratory seabird, is a highly specialised predator of mesopelagic fish and squid, and therefore can be used as a bioindicator for the mesopelagic domain. Mercury accumulated by the birds through diet is excreted into feathers during the moulting process in adults and feather growth in chicks, reflecting contamination in the non-breeding and breeding periods, respectively, and hence the influence of different, largely non-overlapping breeding and non-breeding ranges. We studied mercury in feathers and the trophic position in two colonies from the Atlantic Ocean (Portugal and Cape Verde) and two colonies from the Pacific Ocean (Japan and Hawaii). We found significantly lower levels of mercury in adult and chick samples from the Pacific Ocean compared with samples from the Atlantic Ocean. However, we did not detect differences in trophic position of chicks among colonies and oceans, suggesting that differences in mercury measured in feathers reflect levels of environmental contamination, rather than differences in the structure of the trophic chain in different oceans. We conclude that despite a reduction in mercury levels in the Atlantic in recent decades, mesopelagic organisms in this ocean remain more heavily contaminated than in the Pacific at tropical and subtropical latitudes. We suggest that Bulwer's petrel is a highly suitable species to monitor the global contamination of mercury in the mesopelagic domain.
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Affiliation(s)
- Ricardo Furtado
- MARE - Marine and Environmental Sciences Centre, ISPA - Instituto Universitário, Rua Jardim do Tabaco, 1149-041 Lisboa, Portugal.
| | - José Pedro Granadeiro
- CESAM - Centre for Environmental and Marine Studies, Departamento de Biologia Animal, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - Marie Claire Gatt
- CESAM - Centre for Environmental and Marine Studies, Departamento de Biologia Animal, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - Rachel Rounds
- Pacific Islands Refuges and Monuments Office Inventory and Monitoring Program U.S. Fish and Wildlife Service, Honolulu, HI 808-792-9559, United States of America
| | - Kazuo Horikoshi
- Institute of Boninology Chichijima, Ogasawara-mura, Tokyo 100-2101, Japan
| | - Vítor H Paiva
- Universidade de Coimbra, MARE - Marine and Environmental Sciences Centre, Departamento de Ciências da Vida, Calçada Martim de Freitas, 3000-456 Coimbra, Portugal
| | - Dilia Menezes
- Instituto das Florestas e Conservação da Natureza, IP-RAM, 9064-512 Funchal, Portugal
| | - Eduarda Pereira
- Department of Chemistry and CESAM/REQUIMTE, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Paulo Catry
- MARE - Marine and Environmental Sciences Centre, ISPA - Instituto Universitário, Rua Jardim do Tabaco, 1149-041 Lisboa, Portugal
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Amino acid δ15N differences consistent with killer whale ecotypes in the Arctic and Northwest Atlantic. PLoS One 2021; 16:e0249641. [PMID: 33798257 PMCID: PMC8018630 DOI: 10.1371/journal.pone.0249641] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 03/23/2021] [Indexed: 11/19/2022] Open
Abstract
Ecotypes are groups within a species with different ecological adaptations than their conspecifics. Eastern North Pacific (ENP) killer whale (Orcinus orca) ecotypes differ in their diet, behavior, and morphology, but the same is not known for this species in the eastern Canadian Arctic (ECA) and Northwest Atlantic (NWA). Using compound-specific stable isotope analysis (CSIA) of amino acids (AAs), we compared δ15N patterns of the primary trophic and source AA pair, glutamic acid/glutamine (Glx) and phenylalanine (Phe), in dentine collagen of (1) sympatric ENP killer whale ecotypes with well-characterized diet differences and (2) ECA/NWA killer whales with unknown diets. δ15NGlx-Phe was significantly higher in the ENP fish-eating (FE) than mammal-eating (ME) ecotype (19.2 ± 0.4‰ vs. 13.5 ± 0.7‰, respectively). Similar bimodal variation in δ15NGlx-Phe indicated analogous dietary divisions among ECA/NWA killer whales, with two killer whales having higher δ15NGlx-Phe (16.5 ± 0.0‰) than the others (13.5 ± 0.6‰). Inferences of dietary divisions between these killer whales were supported by parallel differences in threonine δ15N (–33.5 ± 1.6‰ and –40.4 ± 1.1‰, respectively), given the negative correlation between δ15NThr and TP across a range of marine consumers. CSIA-AA results for ECA/NWA whales, coupled with differences in tooth wear (a correlate for diet), are consistent with ecotype characteristics reported in ENP and other killer whale populations, thus adding to documented ecological divergence in this species worldwide.
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Le-Alvarado M, Romo-Curiel AE, Sosa-Nishizaki O, Hernández-Sánchez O, Barbero L, Herzka SZ. Yellowfin tuna (Thunnus albacares) foraging habitat and trophic position in the Gulf of Mexico based on intrinsic isotope tracers. PLoS One 2021; 16:e0246082. [PMID: 33626056 PMCID: PMC7904200 DOI: 10.1371/journal.pone.0246082] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 01/12/2021] [Indexed: 11/20/2022] Open
Abstract
Yellowfin tuna (YFT, Thunnus albacares) is a commercially important species targeted by fisheries in the Gulf of Mexico (GM). Previous studies suggest a high degree of residency in the northern GM, although part of the population performs movements to southern Mexican waters. Whether YFT caught in southern waters also exhibit residency or migrate to the northern gulf is currently uncertain, and little is known regarding their trophic ecology. The isotopic composition (bulk & amino acids) of YFT muscle and liver tissues were compared to a zooplankton-based synoptic isoscape from the entire GM to infer feeding areas and estimate Trophic Position (TP). The spatial distribution of δ15Nbulk and δ15NPhe values of zooplankton indicated two distinct isotopic baselines: one with higher values in the northern GM likely driven by denitrification over the continental shelf, and another in the central-southern gulf, where nitrogen fixation predominates. Based on the contribution of the two regional isotopic baselines to YFT tissues, broad feeding areas were inferred, with a greater contribution of the northern GM (over a one-year time scale by muscle), and to a lesser extent in the central-southern GM (over the ca. 6-month scale by liver). This was corroborated by similarities in δ15NPhe values between YFT and the northern GM. TP estimates were calculated based on stable isotope analysis of bulk (SIA) and compound-specific isotope analysis (CSIA-AA) of the canonical source and trophic amino acids. Mean TP based on SIA was 4.9 ± 1.0 and mean TP based on CSIA-A was 3.9 ± 0.2. YFT caught within the Mexican region seem to feed in northern and in central and southern GM, while feeding in the northern GM has a temporal component. Thus, management strategies need to consider that YFT caught in US and Mexican waters are a shared binational resource that exhibit feeding migrations within the GM.
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Affiliation(s)
- Meliza Le-Alvarado
- Department of Biological Oceanography, Center for Scientific Research and Higher Education of Ensenada (CICESE), Ensenada, Baja California, México
| | - Alfonsina E. Romo-Curiel
- Department of Biological Oceanography, Center for Scientific Research and Higher Education of Ensenada (CICESE), Ensenada, Baja California, México
| | - Oscar Sosa-Nishizaki
- Department of Biological Oceanography, Center for Scientific Research and Higher Education of Ensenada (CICESE), Ensenada, Baja California, México
| | - Oscar Hernández-Sánchez
- Department of Biological Oceanography, Center for Scientific Research and Higher Education of Ensenada (CICESE), Ensenada, Baja California, México
| | - Leticia Barbero
- Ocean Chemistry and Ecosystems Division, Cooperative Institute for Marine and Atmospheric Studies (CIMAS), NOAA’s Atlantic Oceanographic and Meteorological Laboratory, Miami, Florida, United States of America
| | - Sharon Z. Herzka
- Department of Biological Oceanography, Center for Scientific Research and Higher Education of Ensenada (CICESE), Ensenada, Baja California, México
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Thébault J, Bustamante P, Massaro M, Taylor G, Quillfeldt P. Influence of Species-Specific Feeding Ecology on Mercury Concentrations in Seabirds Breeding on the Chatham Islands, New Zealand. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2021; 40:454-472. [PMID: 33201544 DOI: 10.1002/etc.4933] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 08/20/2020] [Accepted: 11/10/2020] [Indexed: 06/11/2023]
Abstract
Mercury (Hg) is a toxic metal that accumulates in organisms and biomagnifies along food webs; hence, long-lived predators such as seabirds are at risk as a result of high Hg bioaccumulation. Seabirds have been widely used to monitor the contamination of marine ecosystems. In the present study, we investigated Hg concentrations in blood, muscle, and feathers of 7 procellariform seabirds breeding on the Chatham Islands, New Zealand. Using bulk and compound-specific stable isotope ratios of carbon and nitrogen as a proxy of trophic position and distribution, we also tested whether Hg contamination is related to the species-specific feeding ecology. Mercury exposure varied widely within the seabird community. The highest contaminated species, the Magenta petrel, had approximately 29 times more Hg in its blood than the broad-billed prion, and approximately 35 times more Hg in its feathers than the grey-backed storm petrel. Variations of Hg concentrations in blood and feathers were significantly and positively linked to feeding habitats and trophic position, highlighting the occurrence of efficient Hg biomagnification processes along the food web. Species and feeding habitats were the 2 main drivers of Hg exposure within the seabird community. The Pterodroma species had high blood and feather Hg concentrations, which can be caused by their specific physiology and/or because of their foraging behavior during the interbreeding period (i.e., from the Tasman Sea to the Humboldt Current system). These 2 threatened species are at risk of suffering detrimental effects from Hg contamination and further studies are required to investigate potential negative impacts, especially on their reproduction capability. Environ Toxicol Chem 2021;40:454-472. © 2020 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC.
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Affiliation(s)
- Justine Thébault
- Department of Animal Ecology and Systematics, Justus Liebig University Giessen, Giessen, Germany
- Littoral Environnement et Sociétés (LIENSs), UMR 7266 CNRS-La Rochelle Université, La Rochelle, France
| | - Paco Bustamante
- Littoral Environnement et Sociétés (LIENSs), UMR 7266 CNRS-La Rochelle Université, La Rochelle, France
- Institut Universitaire de France (IUF), Paris, France
| | - Melanie Massaro
- Institute for Land, Water and Society, School of Environmental Sciences, Charles Sturt University, Albury, Australia
| | - Graeme Taylor
- Department of Conservation, Biodiversity Group, Wellington, New Zealand
| | - Petra Quillfeldt
- Department of Animal Ecology and Systematics, Justus Liebig University Giessen, Giessen, Germany
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Barst BD, Muir DC, O’Brien DM, Wooller MJ. Validation of dried blood spot sampling for determining trophic positions of Arctic char using nitrogen stable isotope analyses of amino acids. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2021; 35:e8992. [PMID: 33125783 PMCID: PMC7755117 DOI: 10.1002/rcm.8992] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 10/22/2020] [Accepted: 10/26/2020] [Indexed: 06/11/2023]
Abstract
RATIONALE Dried blood spots (DBSs) are gaining popularity for biomarker analyses in ecological research due to their advantages for use in field-based research and in remote settings; however, many DBS biomarkers remain unvalidated. We validated the application of compound-specific stable nitrogen isotope analyses of amino acids (CSIA-AAs) to field-prepared DBSs for determining trophic positions of wild-caught Arctic char (Salvelinus alpinus). METHODS Whole blood and muscle from Arctic char were collected, and DBSs were created in the field. We measured the stable nitrogen isotope ratios (expressed as δ15 N values) of the amino acids glutamic acid (Glu) and phenylalanine (Phe) isolated from Arctic char samples using CSIA-AAs. We then compared amino acid δ15 N values from DBSs and the other sample types (whole blood and muscle) from the same specimens. We calculated and compared trophic position estimates generated from whole blood, DBSs, and muscle. RESULTS The δ15 N values of Glu and Phe, as well as trophic position estimates from DBSs, were highly correlated with δ15 N values and estimates from both whole blood and muscle. The DBS amino acid δ15 N values and trophic position estimates agreed well with those from whole blood. Although mean differences between amino acid δ15 N values from DBSs and muscle were noted, the offsets were small and resulted in a 0.2 mean difference between trophic position estimates for DBSs and muscle. CONCLUSIONS We demonstrate that the application of CSIA-AAs to field-prepared DBSs of Arctic char generates similar trophic position estimates to those from whole blood and muscle. We suggest that DBSs could be developed as a minimally invasive sampling technique to study feeding ecology of wild fish and perhaps other organisms of interest.
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Affiliation(s)
- Benjamin D. Barst
- Water and Environmental Research Center, Institute of Northern Engineering, University of Alaska Fairbanks, Fairbanks, Alaska, USA
| | - Derek C.G. Muir
- Aquatic Contaminants Research Division, Environment Canada, Burlington, Ontario, Canada
| | - Diane M. O’Brien
- Biology and Wildlife Department, University of Alaska Fairbanks, Fairbanks, Alaska, USA
- Center for Alaska Native Health Research, Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, Alaska, USA
| | - Matthew J. Wooller
- Water and Environmental Research Center, Institute of Northern Engineering, University of Alaska Fairbanks, Fairbanks, Alaska, USA
- Alaska Stable Isotope Facility, Institute of Northern Engineering, University of Alaska Fairbanks, Fairbanks, Alaska, USA
- College of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Fairbanks, Alaska, USA
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Yurkowski DJ, Brown TA, Blanchfield PJ, Ferguson SH. Atlantic walrus signal latitudinal differences in the long-term decline of sea ice-derived carbon to benthic fauna in the Canadian Arctic. Proc Biol Sci 2020; 287:20202126. [PMID: 33290685 DOI: 10.1098/rspb.2020.2126rspb20202126] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023] Open
Abstract
Climate change is altering the biogeochemical and physical characteristics of the Arctic marine environment, which impacts sea ice algal and phytoplankton bloom dynamics and the vertical transport of these carbon sources to benthic communities. Little is known about whether the contribution of sea ice-derived carbon to benthic fauna and nitrogen cycling has changed over multiple decades in concert with receding sea ice. We combined compound-specific stable isotope analysis of amino acids with highly branched isoprenoid diatom lipid biomarkers using archived (1982-2016) tissue of benthivorous Atlantic walrus to examine temporal trends of sea ice-derived carbon, nitrogen isotope baseline and trophic position of Atlantic walrus at high- and mid-latitudes in the Canadian Arctic. Associated with an 18% sea ice decline in the mid-Arctic, sea ice-derived carbon contribution to Atlantic walrus decreased by 75% suggesting a strong decoupling of sea ice-benthic habitats. By contrast, a nearly exclusive amount of sea ice-derived carbon was maintained in high-Arctic Atlantic walrus (98% in 1996 and 89% in 2006) despite a similar percentage in sea ice reduction. Nitrogen isotope baseline or the trophic position of Atlantic walrus did not change over time at either location. These findings indicate latitudinal differences in the restructuring of carbon energy sources used by Atlantic walrus and their benthic prey, and in turn a change in Arctic marine ecosystem functioning between sea ice-pelagic-benthic habitats.
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Affiliation(s)
| | - Thomas A Brown
- Scottish Association for Marine Science, Oban PA37 1QA, UK
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Yurkowski DJ, Brown TA, Blanchfield PJ, Ferguson SH. Atlantic walrus signal latitudinal differences in the long-term decline of sea ice-derived carbon to benthic fauna in the Canadian Arctic. Proc Biol Sci 2020; 287:20202126. [PMID: 33290685 PMCID: PMC7739943 DOI: 10.1098/rspb.2020.2126] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Accepted: 11/16/2020] [Indexed: 11/28/2022] Open
Abstract
Climate change is altering the biogeochemical and physical characteristics of the Arctic marine environment, which impacts sea ice algal and phytoplankton bloom dynamics and the vertical transport of these carbon sources to benthic communities. Little is known about whether the contribution of sea ice-derived carbon to benthic fauna and nitrogen cycling has changed over multiple decades in concert with receding sea ice. We combined compound-specific stable isotope analysis of amino acids with highly branched isoprenoid diatom lipid biomarkers using archived (1982-2016) tissue of benthivorous Atlantic walrus to examine temporal trends of sea ice-derived carbon, nitrogen isotope baseline and trophic position of Atlantic walrus at high- and mid-latitudes in the Canadian Arctic. Associated with an 18% sea ice decline in the mid-Arctic, sea ice-derived carbon contribution to Atlantic walrus decreased by 75% suggesting a strong decoupling of sea ice-benthic habitats. By contrast, a nearly exclusive amount of sea ice-derived carbon was maintained in high-Arctic Atlantic walrus (98% in 1996 and 89% in 2006) despite a similar percentage in sea ice reduction. Nitrogen isotope baseline or the trophic position of Atlantic walrus did not change over time at either location. These findings indicate latitudinal differences in the restructuring of carbon energy sources used by Atlantic walrus and their benthic prey, and in turn a change in Arctic marine ecosystem functioning between sea ice-pelagic-benthic habitats.
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30
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Ledesma M, Gorokhova E, Holmstrand H, Garbaras A, Karlson AML. Nitrogen isotope composition of amino acids reveals trophic partitioning in two sympatric amphipods. Ecol Evol 2020; 10:10773-10784. [PMID: 33072295 PMCID: PMC7548185 DOI: 10.1002/ece3.6734] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 07/20/2020] [Accepted: 08/03/2020] [Indexed: 11/10/2022] Open
Abstract
According to ecological theory, two species cannot occupy the same niche. Using nitrogen isotope analyses (δ15N) of amino acids, we tested the extent to which two sympatric deposit‐feeding amphipods, Monoporeia affinis and Pontoporeia femorata, partition their trophic resources. We found that trophic position (TP) and resynthesis index (∑V; a proxy for degradation status of ingested material prior to assimilation by the consumer) differ between species. The surface‐feeding M. affinis had higher TP and intermediate ∑V, both pointing to a large contribution of metazoans in its diet. P. femorata, which feeds in the subsurface layers, had lower TP and a bimodal distribution of the ∑V values, supporting previous experimental evidence of a larger feeding niche. We also evaluated whether TP and ∑V values have consequences for amphipod fecundity and embryo viability and found that embryo viability in M. affinis was negatively linked to TP. Our results indicate that the amino acid‐δ15N data paired with information about reproductive status are useful for detecting differences in the trophic ecology of sympatric amphipods.
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Affiliation(s)
- Matias Ledesma
- Department of EcologyEnvironment and Plant Science (DEEP)Stockholm UniversityStockholmSweden
| | - Elena Gorokhova
- Department of Environmental Science and Analytical Chemistry (ACES)Stockholm UniversityStockholmSweden
| | - Henry Holmstrand
- Department of Environmental Science and Analytical Chemistry (ACES)Stockholm UniversityStockholmSweden
| | - Andrius Garbaras
- Mass Spectrometry LaboratoryCentre for Physical Science and TechnologyLithuania
| | - Agnes M. L. Karlson
- Department of EcologyEnvironment and Plant Science (DEEP)Stockholm UniversityStockholmSweden
- Stockholm University Baltic Sea CentreStockholmSweden
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Gatt MC, Reis B, Granadeiro JP, Pereira E, Catry P. Generalist seabirds as biomonitors of ocean mercury: The importance of accurate trophic position assignment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 740:140159. [PMID: 32563885 DOI: 10.1016/j.scitotenv.2020.140159] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 06/10/2020] [Accepted: 06/10/2020] [Indexed: 06/11/2023]
Abstract
Monitoring mercury concentration in the marine environment is pivotal due to the risks that mercury intake poses to the ecosystem and human health. It is therefore of interest to make reliable, comparative measurements over large geographic areas. Here, the utility of wide-ranging generalist seabirds as mercury biomonitors at an ocean basin scale was assessed, using the Cory's Shearwater as a model species. The mercury concentration in flight feathers moulted at distant non-breeding areas of geolocator-tracked birds was quantified, reflecting contamination in various geographic areas. Compound-specific isotope analysis of amino acids was used to obtain comparable trophic positionestimates controlled for baseline isoscape. Birds that remained resident in the Canary Current integrated less mercury into their feathers than those that migrated to either the Benguela or Agulhas currents. Residents also occupied a significantly lower trophic position during the non-breeding season than migrants, largely explaining the difference in mercury exposure. Both mercury concentration and trophic position were similar in individuals spending the non-breeding period in the Benguela and Agulhas currents. This paper highlights the importance of accurate trophic position calculation in order to understand mercury exposure in wide-ranging predators and for meaningful spatial comparisons.
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Affiliation(s)
- Marie Claire Gatt
- Centro de Estudos do Ambiente e do Mar (CESAM), Departamento de Biologia Animal, Faculdade de Ciências da Universidade de Lisboa, 1749-016 Lisboa, Portugal.
| | - Bianca Reis
- Centro de Estudos do Ambiente e do Mar (CESAM), Departmento de Quimica, Universidade de Aveiro, 3810-193 Aveiro, Portugal.
| | - José Pedro Granadeiro
- Centro de Estudos do Ambiente e do Mar (CESAM), Departamento de Biologia Animal, Faculdade de Ciências da Universidade de Lisboa, 1749-016 Lisboa, Portugal.
| | - Eduarda Pereira
- Centro de Estudos do Ambiente e do Mar (CESAM), Departmento de Quimica, Universidade de Aveiro, 3810-193 Aveiro, Portugal.
| | - Paulo Catry
- Marine and Environmental Sciences Centre (MARE), ISPA - Instituto Universitário, Rua Jardim do Tabaco 34, 1149-041 Lisbon, Portugal.
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Riekenberg PM, van der Meer M, Schouten S. Practical considerations for improved reliability and precision during determination of δ 15 N values in amino acids using a single combined oxidation-reduction reactor. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2020; 34:e8797. [PMID: 32246866 DOI: 10.1002/rcm.8797] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 03/24/2020] [Accepted: 03/26/2020] [Indexed: 06/11/2023]
Abstract
RATIONALE There has been increased interest in the measurement of δ15 N values in amino acids (AAs) to gain simultaneous insight into both trophic relationships and the composition of biogeochemical sources used by producers at the base of the food web. A new combustion reactor design in gas chromatography/combustion isotope ratio mass spectrometry (GC/C-irMS) equipment has brought to light variable outcomes in performance, highlighting the need for better information about best practices for new systems. METHODS Precision for δ15 N values in amino acids using the single combined oxidation-reduction reactor is improved across a sequence of analyses if the reactor is oxidized for a substantial period (2 h) and subsequently maintained throughout the sequence with 12-17 s seed oxidation before each run during GC/C-irMS. A five-point calibration curve using amino acids with a range of δ15 N values from -2.4‰ to +61.5‰ was used in combination with a 13-15 amino acid mixture to consistently normalize measurements to internationally calibrated reference materials. RESULTS Combining this oxidation method with normalization techniques using both internal and external standards provided a reliable throughput of ~25 samples per week. It allowed for a reproducible level of precision of <±0.5‰, n = 10 within a derivatized standard mixture across each sequence and an average sample precision of ±0.27‰ n = 3, which is lower than the analytical precision typically associated with δ15 N values for amino acid analysis (<±1‰). CONCLUSIONS A few practical considerations regarding oxidation and conditioning of the combustion reactor allow for increased sequence capacity with the single combined oxidation-reduction reactor. These considerations combined with normalization techniques result in a higher throughput and reduced analytical error during the measurement of δ15 N values in amino acids.
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Affiliation(s)
- Philip M Riekenberg
- NIOZ Royal Netherlands Institute for Sea Research, Marine Microbiology and Biogeochemistry Department, Utrecht University, Den Burg, The Netherlands
| | - Marcel van der Meer
- NIOZ Royal Netherlands Institute for Sea Research, Marine Microbiology and Biogeochemistry Department, Utrecht University, Den Burg, The Netherlands
| | - Stefan Schouten
- NIOZ Royal Netherlands Institute for Sea Research, Marine Microbiology and Biogeochemistry Department, Utrecht University, Den Burg, The Netherlands
- Faculty of Geosciences, Utrecht University, Utrecht, The Netherlands
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Ayayee PA, Kinney G, Yarnes C, Larsen T, Custer GF, van Diepen LTA, Muñoz-Garcia A. Role of the gut microbiome in mediating standard metabolic rate after dietary shifts in the viviparous cockroach, Diploptera punctata. J Exp Biol 2020; 223:jeb218271. [PMID: 32393544 DOI: 10.1242/jeb.218271] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 05/05/2020] [Indexed: 01/22/2023]
Abstract
Diet may be a significant determinant of insect gut microbiome composition. However, the extent to which dietary shifts shape both the composition and relevant functions of insect gut microbiomes, and ultimately impact host energy balance (i.e. metabolic phenotype), is not well understood. We investigated the impacts of diet switching on Diploptera punctata females maintained on a dog food (DF) diet relative to those fed a comparatively sub-optimal cellulose-amended dog food (CADF) diet for 4 weeks. After this period, dietary shift resulted in a significantly higher average mass-specific standard metabolic rate (SMR) in CADF-fed females compared with DF-fed females. We also uncovered significant 13C-enrichment in DF-fed insect samples relative to CADF-fed insect samples and lowered bacterial essential amino acid (EAA) provisioning in CADF-fed samples. Differences in SMR and EAA provisioning were not accompanied by significant differences in overall microbiome composition between the two groups. However, cellulolytic and nitrogen-fixing bacterial families dominant in wild omnivorous cockroaches and wood-feeding termites were significantly enriched in CADF-fed females than in DF-fed females, at the end of the study. We propose that these changes in microbiome composition after dietary shifts are associated with changes in EAA provisioning and possibly SMR. Further studies are needed to comprehensively understand the relative importance of gut microbial functions among the complexity of factors known to underscore SMR responses in insects under varying dietary conditions.
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Affiliation(s)
- Paul A Ayayee
- Department of Ecosystem Science and Management, University of Wyoming, Laramie, WY 82071, USA
| | - George Kinney
- Department of Evolution, Ecology and Organismal Biology, The Ohio State University, Columbus, OH 43210, USA
| | - Chris Yarnes
- Department of Plant Sciences, Stable Isotope Facility, University of California, Davis, Davis, CA 95616, USA
| | - Thomas Larsen
- Max Planck Institute for the Science of Human History, Kahlaische Strasse, 07745 Jena, Germany
| | - Gordon F Custer
- Department of Ecosystem Science and Management, University of Wyoming, Laramie, WY 82071, USA
| | - Linda T A van Diepen
- Department of Ecosystem Science and Management, University of Wyoming, Laramie, WY 82071, USA
| | - Agustí Muñoz-Garcia
- Department of Evolution, Ecology and Organismal Biology, The Ohio State University at Mansfield, Mansfield, OH 43210, USA
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Abstract
Nutritionists have been discussing whether the dietary supplementation of cyst(e)ine is required as a part of the dietary methionine (Met) in the total sulfur amino acid (TSAA) requirement to achieve optimum performance in broilers. Part of Met is converted to cysteine (Cys) to meet the Cys requirement, especially for feather growth. The TSAA requirement has been determined by using graded levels of free Met in the diet, without supplementation of free cyst(e)ine. It has also been argued that the Met to Cys ratio (Met : Cys) changes with age and even with different Met sources. The objective of this study was to evaluate the two sources of Met, while determining the proportion of Met and Cys in total dietary TSAA that optimize the performance of broilers. A performance assay was carried out in a factorial arrangement (5 × 2) using 1080 broilers from 42 to 56 days of age fed diets having different dietary proportions of Met and Cys (44 : 56, 46 : 54, 48 : 52, 50 : 50 or 52 : 48) while maintaining the same dietary TSAA in the diets. Two synthetic Met sources (dl-Met or l-Met) were used for each of the diets with different dietary Met : Cys ratios. Twenty-one broilers of the same age were fed the diets 44 : 56, 48 : 52 and 52 : 48 by supplementing the diet with L-(15N) Met or L-(15N2) Cystine to study the metabolism of TSAA. No differences were observed between Met sources for feed intake, BW gain and feed conversion ratio (FCR; P > 0.05); however, FCR was numerically improved at 50 : 50 Met : Cys. Regarding TSAA utilization, the conversion of Met to Cys increased with increase in Met : Cys ratios, but the concentration of Met intermediates decreased. Broiler chickens responded to different dietary proportions of sulfur amino acids by altering their sulfur amino acid metabolism, and diets containing 50 : 50 Met : Cys is recommended for broilers of age 42 to 56 days.
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Compound-specific stable isotope analyses in Falkland Islands seabirds reveal seasonal changes in trophic positions. BMC Ecol 2020; 20:21. [PMID: 32293412 PMCID: PMC7160925 DOI: 10.1186/s12898-020-00288-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Accepted: 04/04/2020] [Indexed: 12/05/2022] Open
Abstract
Background While nitrogen and carbon stable isotope values can reflect ecological segregation, prey choice and spatial distribution in seabirds, the interpretation of bulk stable isotope values is frequently hampered by a lack of isotopic baseline data. In this study, we used compound-specific isotope analyses of amino acids (CSIA-AA) to overcome this constraint and to study interspecific differences, seasonal and historical changes in trophic positions of five seabird species, three penguins and two petrels, from a sub-Antarctic seabird community. Results CSIA-AA allowed comparing trophic positions of seabirds with temperate and polar distributions. Gentoo and Magellanic penguins had the highest trophic positions during the breeding season (3.7 and 3.9), but decreased these (2.9 and 3.3) during the feed-up for moult. Intra-specific differences were also detected in Thin-billed prions, where carbon isotope values clearly separated individuals with polar and temperate distributions, both in the breeding and interbreeding periods. Thin-billed prions that foraged in polar waters had lower trophic positions (3.2) than conspecifics foraging in temperate waters (3.8). We further investigated historical changes by comparing museum samples with samples collected recently. Our pilot study suggests that Rockhopper penguins, Magellanic penguins and Thin-billed prions with temperate non-breeding distributions had retained their trophic levels over a 90–100 year period, while Gentoo penguins and Thin-billed prions with polar non-breeding distributions had decreased trophic levels compared to historical samples. In contrast, Wilson’s storm-petrels had slightly increased trophic levels compared to samples taken in 1924–1930. Conclusions We applied compound-specific stable isotope analyses across a range of contexts, from intra-specific comparisons between stages of the breeding cycle to inter-specific seabird community analysis that would not have been possible using bulk stable isotope analyses alone due to differences in isotopic baselines.
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Matthews CJD, Ruiz-Cooley RI, Pomerleau C, Ferguson SH. Amino acid δ 15N underestimation of cetacean trophic positions highlights limited understanding of isotopic fractionation in higher marine consumers. Ecol Evol 2020; 10:3450-3462. [PMID: 32274001 PMCID: PMC7141024 DOI: 10.1002/ece3.6142] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Revised: 01/31/2020] [Accepted: 02/05/2020] [Indexed: 01/23/2023] Open
Abstract
Compound-specific stable isotope analysis (CSIA) of amino acids (AAs) has been rapidly incorporated in ecological studies to resolve consumer trophic position (TP). Differential 15N fractionation of "trophic" AAs, which undergo trophic 15N enrichment, and "source" AAs, which undergo minimal trophic 15N enrichment and serve as a proxy for primary producer δ15N values, allows for internal calibration of TP. Recent studies, however, have shown the difference between source and trophic AA δ15N values in higher marine consumers is less than predicted from empirical studies of invertebrates and fish. To evaluate CSIA-AA for estimating TP of cetaceans, we compared source and trophic AA δ15N values of multiple tissues (skin, baleen, and dentine collagen) from five species representing a range of TPs: bowhead whales, beluga whales, short-beaked common dolphins, sperm whales, and fish-eating (FE) and marine mammal-eating (MME) killer whale ecotypes. TP estimates (TPCSIA) using several empirically derived equations and trophic discrimination factors (TDFs) were 1-2.5 trophic steps lower than stomach content-derived estimates (TPSC) for all species. Although TPCSIA estimates using dual TDF equations were in better agreement with TPSC estimates, our data do not support the application of universal or currently available dual TDFs to estimate cetacean TPs. Discrepancies were not simply due to inaccurate TDFs, however, because the difference between consumer glutamic acid/glutamine (Glx) and phenylalanine (Phe) δ15N values (δ15NGlx-Phe) did not follow expected TP order. In contrast to pioneering studies on invertebrates and fish, our data suggest trophic 15N enrichment of Phe is not negligible and should be examined among the potential mechanisms driving "compressed" and variable δ15NGlx-Phe values at high TPs. We emphasize the need for controlled diet studies to understand mechanisms driving AA-specific isotopic fractionation before widespread application of CSIA-AA in ecological studies of cetaceans and other marine consumers.
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Affiliation(s)
- Cory J D Matthews
- Arctic Aquatic Research Division Fisheries and Oceans Canada Winnipeg MB Canada
| | - Rocio I Ruiz-Cooley
- Departamento de Oceanografía Biológica Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE) Ensenada México
- Moss Landing Marine Laboratories California State University Moss Landing CA USA
| | - Corinne Pomerleau
- Institut Maurice Lamontagne, Fisheries and Oceans Canada Mont-Joli QC Canada
| | - Steven H Ferguson
- Arctic Aquatic Research Division Fisheries and Oceans Canada Winnipeg MB Canada
- Department of Biological Sciences University of Manitoba Winnipeg MB Canada
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Bontempo L, van Leeuwen KA, Paolini M, Holst Laursen K, Micheloni C, Prenzler PD, Ryan D, Camin F. Bulk and compound-specific stable isotope ratio analysis for authenticity testing of organically grown tomatoes. Food Chem 2020; 318:126426. [PMID: 32135420 DOI: 10.1016/j.foodchem.2020.126426] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 12/29/2019] [Accepted: 02/16/2020] [Indexed: 11/26/2022]
Abstract
Until now, there has been a lack of analytical methods that can reliably verify the authenticity of organically grown plants and derived organic food products. In this study, stable isotope ratio analysis of hydrogen (H, δ2H), carbon (C, δ13C), nitrogen (N, δ15N), oxygen (O, δ18O) and sulfur (S, δ34S) was conducted along the tomato passata production process using organic and conventionally grown tomatoes from two Italian regions over two years. A gas chromatography-combustion-isotope ratio mass spectrometry (GC-C-IRMS) based method was developed and applied for analysis of C and N isotope ratios in amino acids derived from tomatoes. Of the bulk isotope ratios, δ15N was the most significant parameter for discriminating organic from conventional products. The classification power was improved significantly by compound-specific isotope analysis regardless of the production years and regions. We conclude that isotope analysis of amino acids is a novel analytical tool for complementing existing certification and control procedures in the organic tomato sector.
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Affiliation(s)
- Luana Bontempo
- Food Quality and Nutrition Department, Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 San Michele all'Adige, Trentino, Italy.
| | - Katryna A van Leeuwen
- Food Quality and Nutrition Department, Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 San Michele all'Adige, Trentino, Italy; School of Agricultural and Wine Sciences, Graham Centre for Agricultural Innovation, Charles Stuart University, Wagga Wagga, NSW 2678, Australia
| | - Mauro Paolini
- Food Quality and Nutrition Department, Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 San Michele all'Adige, Trentino, Italy
| | - Kristian Holst Laursen
- Plant Nutrients and Food Quality Research Group, Plant and Soil Science Section and Copenhagen Plant Science Centre, Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark
| | - Cristina Micheloni
- AIAB - Associazione Italiana per l'Agricoltura Biologica, largo D. Frisullo, 00185 Rome, Italy
| | - Paul D Prenzler
- School of Agricultural and Wine Sciences, Graham Centre for Agricultural Innovation, Charles Stuart University, Wagga Wagga, NSW 2678, Australia
| | - Danielle Ryan
- School of Agricultural and Wine Sciences, Graham Centre for Agricultural Innovation, Charles Stuart University, Wagga Wagga, NSW 2678, Australia
| | - Federica Camin
- Food Quality and Nutrition Department, Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 San Michele all'Adige, Trentino, Italy; Center Agriculture Food Environment (C3A), University of Trento, via Mach 1, 38010 San Michele all'Adige (TN), Italy
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Pacheco LG, Sakomura NK, Suzuki RM, Dorigam JCP, Viana GS, Leme BB. Efficiency of methionine and cystine utilization by broiler chickens using stable isotopes. J Anim Physiol Anim Nutr (Berl) 2019; 104:224-229. [PMID: 31709659 DOI: 10.1111/jpn.13242] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 08/08/2019] [Accepted: 09/25/2019] [Indexed: 12/31/2022]
Abstract
The aim of this study was to develop a method to determine the efficiency of utilization of Met and Cys using stable isotopes in order to reduce the number of sacrificed animals relative to the comparative slaughter technique. Met and Cys efficiencies were obtained separately and as total SAA values. Twenty-one 14- to 28-day-old broiler chickens were fed experimental diets containing different Met:Cys ratios (44:56, 50:50 and 56:44). Birds were given diets with daily supplements of L-(15 N) Met (60 mmol/kg) or L-(15 N2 ) Cys (35 mmol/kg) throughout the entire experimental period. Excreta were collected daily, and birds were euthanized at the end of the trial to collect feather-free bodies and feathers. Samples were analysed for 15 N and 15 N-Met content. The utilization efficiency for Met, Cys and Met + Cys for feather-free bodies was 55%, 75%, and 60%, while the efficiencies for feathers were estimated at 96%, 77% and 84% respectively.
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Affiliation(s)
| | | | | | | | - Gabriel S Viana
- Natural Resources Institute Finland, Luke, Jokioinen, Finland
| | - Bruno B Leme
- Department of Animal Science, Unesp, Jaboticabal, Brazil
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Liew JH, Chua KWJ, Arsenault ER, Thorp JH, Suvarnaraksha A, Amirrudin A, Yeo DCJ. Quantifying terrestrial carbon in freshwater food webs using amino acid isotope analysis: Case study with an endemic cavefish. Methods Ecol Evol 2019. [DOI: 10.1111/2041-210x.13230] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Jia H. Liew
- Department of Biological Sciences National University of Singapore Republic of Singapore
- School of Biological Science The University of Hong Kong Hong Kong SAR China
| | - Kenny W. J. Chua
- Department of Biological Sciences National University of Singapore Republic of Singapore
| | - Emily R. Arsenault
- Kansas Biological Survey and Department of Ecology & Evolutionary Biology University of Kansas Lawrence Kansas USA
| | - James H. Thorp
- Kansas Biological Survey and Department of Ecology & Evolutionary Biology University of Kansas Lawrence Kansas USA
| | - Apinun Suvarnaraksha
- Faculty of Fisheries Technology and Aquatic Resources Maejo University Chiang Mai Thailand
| | - Ahmad Amirrudin
- School of Marine and Environmental Sciences University Malaysia Terengganu Kuala Terengganu Malaysia
| | - Darren C. J. Yeo
- Department of Biological Sciences National University of Singapore Republic of Singapore
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40
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Chung IM, Kim JK, An YJ, Kwon C, Kim SY, Yang YJ, Yarnes CT, Chi HY, Kim SH. Compound-specific δ13C and δ15N analyses of fatty acids and amino acids for discrimination of organic, pesticide-free, and conventional rice (Oryza sativa L.). Food Chem 2019; 283:305-314. [DOI: 10.1016/j.foodchem.2018.12.129] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Revised: 12/16/2018] [Accepted: 12/28/2018] [Indexed: 10/27/2022]
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Jaouen K, Richards MP, Le Cabec A, Welker F, Rendu W, Hublin JJ, Soressi M, Talamo S. Exceptionally high δ 15N values in collagen single amino acids confirm Neandertals as high-trophic level carnivores. Proc Natl Acad Sci U S A 2019; 116:4928-4933. [PMID: 30782806 PMCID: PMC6421459 DOI: 10.1073/pnas.1814087116] [Citation(s) in RCA: 72] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Isotope and archeological analyses of Paleolithic food webs have suggested that Neandertal subsistence relied mainly on the consumption of large herbivores. This conclusion was primarily based on elevated nitrogen isotope ratios in Neandertal bone collagen and has been significantly debated. This discussion relies on the observation that similar high nitrogen isotopes values could also be the result of the consumption of mammoths, young animals, putrid meat, cooked food, freshwater fish, carnivores, or mushrooms. Recently, compound-specific C and N isotope analyses of bone collagen amino acids have been demonstrated to add significantly more information about trophic levels and aquatic food consumption. We undertook single amino acid C and N isotope analysis on two Neandertals, which were characterized by exceptionally high N isotope ratios in their bulk bone or tooth collagen. We report here both C and N isotope ratios on single amino acids of collagen samples for these two Neandertals and associated fauna. The samples come from two sites dating to the Middle to Upper Paleolithic transition period (Les Cottés and Grotte du Renne, France). Our results reinforce the interpretation of Neandertal dietary adaptations as successful top-level carnivores, even after the arrival of modern humans in Europe. They also demonstrate that high δ15N values of bone collagen can solely be explained by mammal meat consumption, as supported by archeological and zooarcheological evidence, without necessarily invoking explanations including the processing of food (cooking, fermenting), the consumption of mammoths or young mammals, or additional (freshwater fish, mushrooms) dietary protein sources.
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Affiliation(s)
- Klervia Jaouen
- Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, 04103 Leipzig, Germany;
| | - Michael P Richards
- Department of Archaeology, Simon Fraser University, Burnaby BC V5A 1S6, Canada
| | - Adeline Le Cabec
- Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, 04103 Leipzig, Germany
| | - Frido Welker
- Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, 04103 Leipzig, Germany
- Evolutionary Genomics, Natural History Museum of Denmark, University of Copenhagen, DK-1353 Copenhagen, Denmark
| | - William Rendu
- De la Préhistoire à l'Actuel: Culture, Environnement et Anthropologie, CNRS-University of Bordeaux, 33615 Pessac, France
| | - Jean-Jacques Hublin
- Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, 04103 Leipzig, Germany
- Chaire Internationale de Paléoanthropologie, Collège de France, 75005 Paris, France
| | - Marie Soressi
- Faculty of Archaeology, Leiden University, 2311 EZ Leiden, The Netherlands
| | - Sahra Talamo
- Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, 04103 Leipzig, Germany
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Chung IM, Kim JK, Yarnes CT, An YJ, Kwon C, Kim SY, Yang YJ, Chi HY, Kim SH. Fatty Acid- and Amino Acid-Specific Isotope Analysis for Accurate Authentication and Traceability in Organic Milk. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:711-722. [PMID: 30543294 DOI: 10.1021/acs.jafc.8b05063] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The present study describes compound-specific δ13C and δ15N analyses of fatty acids and amino acids for improving the accurate authentication of organic milk (OM) against conventional milk (CM) collected in Korea. Most δ13Cfatty-acid and δ13Camino-acid values were lower in OM than in CM ( P < 0.05); however, most δ15Namino-acid values displayed weak discriminative power for OM authentication. Higher isotopic fractionation was observed in δ13Cfatty-acid than in δ13Camino-acid and δ15Namino-acid, with fractionation trends differing with individual amino acids. In particular, δ13Clinoleic-acid of -33.5‰ and δ13Cmyristic-acid of -28‰ were determined to be promising year-round threshold values for Korean OM authentication. The δ13Cbulk was highly correlated with δ13CAla ( r = 0.92) and δ13Coleic-acid, trans ( r = 0.77), and strong positive correlations were observed between δ13CVal and δ13CIle ( r = 0.98) and between δ15NThr and δ15NSer ( r = 0.90). Chemometric modeling for OM authentication produced a high quality model ( R2 X = 0.547, R2 Y = 0.865, and Q2 = 0.689) with reliable chemical markers, notably δ13Cmyristic-acid, δ13Clinoleic-acid, and δ13Cstearic-acid. Furthermore, the models developed for seasonal separation in OM ( Q2 = 0.954) and CM ( Q2 = 0.791) were of good quality. Our findings, based on compound-specific isotope data, improve the reliability of OM authentication in cases where bulk stable isotope ratio analysis alone is insufficient. They also provide valuable insight into the control of fraudulent OM labeling in Korea, with potential application in other countries.
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Affiliation(s)
- Ill-Min Chung
- Department of Crop Science, College of Sanghuh Life Science , Konkuk University , Seoul 05029 , Republic of Korea
| | - Jae-Kwang Kim
- Division of Life Sciences, College of Life Sciences and Bioengineering , Incheon National University , Incheon 406-772 , Republic of Korea
| | - Christopher T Yarnes
- UC Davis Stable Isotope Facility , University of California, Davis , 1 Shields Avenue , Davis , California 95616 , United States
| | - Yeon-Ju An
- Department of Crop Science, College of Sanghuh Life Science , Konkuk University , Seoul 05029 , Republic of Korea
| | - Chang Kwon
- Department of Crop Science, College of Sanghuh Life Science , Konkuk University , Seoul 05029 , Republic of Korea
| | - So-Yeon Kim
- Department of Crop Science, College of Sanghuh Life Science , Konkuk University , Seoul 05029 , Republic of Korea
| | - Yu-Jin Yang
- Department of Crop Science, College of Sanghuh Life Science , Konkuk University , Seoul 05029 , Republic of Korea
| | - Hee-Youn Chi
- Department of Crop Science, College of Sanghuh Life Science , Konkuk University , Seoul 05029 , Republic of Korea
| | - Seung-Hyun Kim
- Department of Crop Science, College of Sanghuh Life Science , Konkuk University , Seoul 05029 , Republic of Korea
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Enggrob KL, Larsen T, Larsen M, Elsgaard L, Rasmussen J. The influence of hydrolysis and derivatization on the determination of amino acid content and isotopic ratios in dual-labeled ( 13 C, 15 N) white clover. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2019; 33:21-30. [PMID: 30328170 DOI: 10.1002/rcm.8300] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Revised: 09/26/2018] [Accepted: 09/27/2018] [Indexed: 06/08/2023]
Abstract
RATIONALE The cycling of peptide- and protein-bound amino acids (AAs) is important for studying the rate-limiting steps in soil nitrogen (N) turnover. A strong tool is stable C and N isotopes used in combination with compound-specific isotope analysis (CSIA), where a prerequisite for analysis is appropriate methods for peptide and protein hydrolysis and appropriate methods for derivatization of AAs for analysis by gas chromatography (GC). METHODS We examined the efficiency of a standard acidic hydrolysis (6 M HCl, 20 h at 110°C) and a fast acidic hydrolysis (6 M HCl, 70 min at 150°C) on the recovery of AAs from a protein standard (bovine serum albumin). The best methods were used on dual-labeled (13 C and 15 N) clover shoot and root juice, divided into four molecular weight (Mw) size fractions. We used NAIP (N-acetyl isopropyl esterification) derivatization for GC/combustion-isotope ratio mass spectrometry (C-IRMS) analysis of AA standards. RESULTS The NAIP derivatization gave very low limits of detection (LODs) (< 2 pmol) and limits of quantification (LOQs) ranging from 0.55 to 4.89 pmol. Comparing the concentrations of individual AAs in hydrolyzed versus unhydrolyzed clover juice samples of the low Mw size fraction (<1 kDa) showed a significant decline in concentration (p <0.03) for seven AAs after hydrolysis. Despite the decline in AA concentration, we found a linear connection between the obtained atomic fraction (13 C/total carbon and 15 N/total nitrogen) for individual AAs of hydrolyzed versus unhydrolyzed samples. CONCLUSIONS The methodology distinguished differences in atomic fractions across AAs, in individual AAs in Mw size fractions, and between shoot and root samples of experimentally labeled white clover. Specifically, the method separated L-glutamate (Glu) and glutamine (Gln). Thus, for a broader use in plant and soil ecology, we present an optimized methodology for GC/C-IRMS analysis of AAs from organic nitrogen samples enriched with 13 C and 15 N - AA stable isotope probing (SIP).
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Affiliation(s)
| | - Thomas Larsen
- Max Planck Institute for the Science of Human History, Kahlaische Str. 10, 07745, Jena, Germany
- Leibniz-Laboratory for Radiometric Dating and Stable Isotope Research, Christian-Albrechts Universität zu Kiel, Kiel, Germany
| | - Mogens Larsen
- Department of Animal Science, Aarhus University, Foulum, Denmark
| | - Lars Elsgaard
- Department of Agroecology, Aarhus University, Foulum, Denmark
| | - Jim Rasmussen
- Department of Agroecology, Aarhus University, Foulum, Denmark
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A Guide to Using Compound-Specific Stable Isotope Analysis to Study the Fates of Molecules in Organisms and Ecosystems. DIVERSITY-BASEL 2019. [DOI: 10.3390/d11010008] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The measurement of stable isotopes in ‘bulk’ animal and plant tissues (e.g., muscle or leaf) has become an important tool for studies of functional diversity from organismal to continental scales. In consumers, isotope values reflect their diet, trophic position, physiological state, and geographic location. However, interpretation of bulk tissue isotope values can be confounded by variation in primary producer baseline values and by overlapping values among potential food items. To resolve these issues, biologists increasingly use compound-specific isotope analysis (CSIA), in which the isotope values of monomers that constitute a macromolecule (e.g., amino acids in protein) are measured. In this review, we provide the theoretical underpinnings for CSIA, summarize its methodology and recent applications, and identify future research directions. The key principle is that some monomers are reliably routed directly from the diet into animal tissue, whereas others are biochemically transformed during assimilation. As a result, CSIA of consumer tissue simultaneously provides information about an animal’s nutrient sources (e.g., food items or contributions from gut microbes) and its physiology (e.g., nitrogen excretion mode). In combination, these data clarify many of the confounding issues in bulk analysis and enable novel precision for tracing nutrient and energy flow within and among organisms and ecosystems.
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Pacheco LG, Sakomura NK, Suzuki RM, Dorigam JCP, Viana GS, Van Milgen J, Denadai JC. Methionine to cystine ratio in the total sulfur amino acid requirements and sulfur amino acid metabolism using labelled amino acid approach for broilers. BMC Vet Res 2018; 14:364. [PMID: 30466432 PMCID: PMC6251137 DOI: 10.1186/s12917-018-1677-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Accepted: 10/30/2018] [Indexed: 12/16/2022] Open
Abstract
Background Assuming that part of Methionine (Met) is converted into Cystine (Cys), but ignoring the rates with which such phenomenon occurs may lead to an excessive supply of Met in poultry diets. Such inconvenient could be easily avoided with the knowledge of the ideal Met:Cys/Total sulfur amino acids (TSAA) ratio and the rates of Met conversion into Cys. Results Met sources did not affect performance. Met:Cys/TSAA ideal ratio was determined using curvilinear-plateau regression model. Both optimum body weight gain and feed conversion ratio were estimated in 1007 g/day and 1.49, respectively, at 52% Met/TSAA ratio. Feed intake was not affected by Met:Cys/TSAA ratios. In the labelled amino acid assay, the rates with which Met was converted into Cys ranged from 27 to 43% in response to changes in Met:Cys/TSAA ratios, being higher at 56:44. Conclusion Based on performance outcomes, the minimum concentration of Met relative to Cys in diets for broilers from 14 to 28 d of age based on a TSAA basis, is 52% (52:48 Met:Cys/TSAA). The outcomes from labelled amino acid assay indicate that highest the Met supply in diets, the highest is its conversion into Cys.
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Affiliation(s)
| | | | - Rafael M Suzuki
- Department of Animal Science, Unesp, Jaboticabal, SP, Brazil
| | | | - Gabriel S Viana
- Department of Animal Science, Unesp, Jaboticabal, SP, Brazil
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Nuche‐Pascual MT, Lazo JP, Ruiz‐Cooley RI, Herzka SZ. Amino acid-specific δ 15N trophic enrichment factors in fish fed with formulated diets varying in protein quantity and quality. Ecol Evol 2018; 8:9192-9217. [PMID: 30377494 PMCID: PMC6194260 DOI: 10.1002/ece3.4295] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Revised: 05/07/2018] [Accepted: 05/20/2018] [Indexed: 11/10/2022] Open
Abstract
Compound-specific isotope analysis (CSIA) of amino acids (AAs) in consumer tissues is a developing technique with wide-ranging applications for identifying nitrogen (N) sources and estimating animal trophic level. Controlled experiments are essential for determining which dietary conditions influence variability in N stable isotopes (δ15N) trophic enrichment factors in bulk tissue (TEFbulk) and AAs (TEFAA). To date, however, studies have not independently evaluated the effect of protein quantity and quality (digestibility) on TEFs, complicating the application of AA-δ15N values for estimating trophic levels. We conducted a 98-d feeding experiment using five formulated isoenergetic feeds prepared with a high-quality protein source to evaluate the effect of protein quantity and quality on TEFs of liver and muscle tissues of juvenile Pacific yellowtail (Seriola lalandi), a carnivorous fish species. We decreased protein digestibility using well-established protocols that do not change AA profiles. Growth rates were higher in diets with higher protein content, and isotopic equilibrium was reached for both fish tissues and all treatments. Protein quantity and quality influenced isotope discrimination depending on tissue type and AA. In liver tissue, bulk TEFs showed a limited but significant relationship with protein quality, but did not differ with protein quantity or quality in muscle. None of the pre-established source AAs (Lys, Met, Phe, and Gly) TEFs varied significantly with protein quantity or quality in liver tissue. However, in muscle tissue, TEFPhe increased significantly with protein content and decreased in response to reduced digestibility, indicating it may not serve as proxy for baseline isotopic values used to calculate trophic level. Among trophic AAs, TEFLeu decreased significantly with increasing protein quantity in liver tissue, while both Leu and Ile TEFs decreased with lower protein digestibility in muscle tissue. Our results indicate that CSIA-AA in liver tissue provides more robust source and trophic AA-δ15N values than in muscle.
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Affiliation(s)
- M. Teresa Nuche‐Pascual
- Departamento de Oceanografía BiológicaCentro de Investigación Científica y de Educación Superior de Ensenada (CICESE)EnsenadaMéxico
| | | | | | - Sharon Z. Herzka
- Departamento de Oceanografía BiológicaCentro de Investigación Científica y de Educación Superior de Ensenada (CICESE)EnsenadaMéxico
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47
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Wu L, Liu X, Xu L, Li L, Fu P. Compound-specific 15N analysis of amino acids: A tool to estimate the trophic position of tropical seabirds in the South China Sea. Ecol Evol 2018; 8:8853-8864. [PMID: 30271550 PMCID: PMC6157660 DOI: 10.1002/ece3.4282] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 04/23/2018] [Accepted: 05/20/2018] [Indexed: 11/24/2022] Open
Abstract
Compound-specific 15N analysis of amino acids (AAs) is a powerful tool to determine the trophic position (TP) of organisms. However, it has only been used in a few studies of avian ecology because the AA patterns in the consumer-diet nitrogen trophic discrimination factor (TDFG lu-Phe = ∆15 NG lu-∆15 NP he) were unknown in birds until recently, and tropical seabirds have never been investigated with this methodology. Here, we explore the application of this method to tropical seabirds. In this study, we recovered the fossilized bones of tropical seabirds from ornithogenic sediments on two coral islands in the Xisha Islands, South China Sea, as well as the bones and muscle of their predominant food source, flying fish (Exocoetus volitans). Compound-specific 15N and 13C analyses of AAs in both seabird and fish bone collagen were conducted. The TP of flying fish was calculated based on a widely used single TDFG lu-Phe approach. We then calculated the TP of tropical seabirds in three different ways: (a) according to the composition of their diet; (b) based on the single TDFG lu-Phe approach; and (c) using a multi-TDFG lu-Phe approach. The results of the multi-TDFG lu-Phe approach were much closer to the results based on the composition of the seabird diet than the results of the single TDFG lu-Phe approach, confirming its applicability for tropical seabirds. For seabird bone samples of different ages, TP determined from the multi-TDFG lu-Phe approach was most similar to that of bulk δ15N of bird collagen, with seabirds occupying higher TPs during the Little Ice Age, as previously shown. In addition, the 13C Suess effect was reflected in the AAs δ13C in our samples. This study applied a compound-specific 15N analysis of AAs to determine the TP of tropical seabirds that has potential to extend to all tropical seabirds many of which are widely distributed and play a key role in the evolution of coral island ecosystems.
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Affiliation(s)
- Libin Wu
- Institute of Polar EnvironmentSchool of Earth and Space SciencesUniversity of Science and Technology of ChinaHefeiAnhuiChina
- Anhui Province Key Laboratory of Polar Environment and Global ChangeUniversity of Science and Technology of ChinaHefeiAnhuiChina
| | - Xiaodong Liu
- Institute of Polar EnvironmentSchool of Earth and Space SciencesUniversity of Science and Technology of ChinaHefeiAnhuiChina
- Anhui Province Key Laboratory of Polar Environment and Global ChangeUniversity of Science and Technology of ChinaHefeiAnhuiChina
| | - Liqiang Xu
- School of Resources and Environmental EngineeringHefei University of TechnologyHefeiAnhuiChina
| | - Linjie Li
- LAPCInstitute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina
| | - Pingqing Fu
- Institute of Surface‐Earth System ScienceTianjin UniversityTianjinChina
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48
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Ek C, Holmstrand H, Mustajärvi L, Garbaras A, Barisevičiu Te RT, Šapolaitė J, Sobek A, Gorokhova E, Karlson AML. Using Compound-Specific and Bulk Stable Isotope Analysis for Trophic Positioning of Bivalves in Contaminated Baltic Sea Sediments. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:4861-4868. [PMID: 29565572 DOI: 10.1021/acs.est.7b05782] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Stable nitrogen isotopes (δ15N) are used as indicators of trophic position (TP) of consumers. Deriving TP from δ15N of individual amino acids (AAs) is becoming popular in ecological studies, because of lower uncertainty than TP based on bulk δ15N (TPbulk). This method would also facilitate biomagnification studies provided that isotope fractionation is unaffected by toxic exposure. We compared TPAA and TPbulk estimates for a sediment-dwelling bivalve from two coastal sites, a pristine and a contaminated. Chemical analysis of PCB levels in mussels, sediments, and pore water confirmed the expected difference between sites. Both methods, but in particular the TPAA underestimated the actual TP of bivalves. Using error propagation, the total uncertainty related to the analytical precision and assumptions in the TP calculations was found to be similar between the two methods. Interestingly, the significantly higher intercept for the regression between TPAA and TPbulk in the contaminated site compared to the pristine site indicates a higher deamination rate due to detoxification as a result of chronic exposure and a higher 15N fractionation. Hence, there is a need for controlled experiments on assumptions underlying amino acid-specific stable isotope methods in food web and bimagnification studies.
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Affiliation(s)
- Caroline Ek
- Department of Environmental Science and Analytical Chemistry , Stockholm University , Svante Arrhenius väg 8 , SE-106 91 Stockholm , Sweden
| | - Henry Holmstrand
- Department of Environmental Science and Analytical Chemistry , Stockholm University , Svante Arrhenius väg 8 , SE-106 91 Stockholm , Sweden
| | - Lukas Mustajärvi
- Department of Environmental Science and Analytical Chemistry , Stockholm University , Svante Arrhenius väg 8 , SE-106 91 Stockholm , Sweden
| | - Andrius Garbaras
- Mass Spectrometry Laboratory , Center for Physical Science and Technology , Savanoriu 231 , LT-02300 Vilnius , Lithuania
| | - Ru Ta Barisevičiu Te
- Mass Spectrometry Laboratory , Center for Physical Science and Technology , Savanoriu 231 , LT-02300 Vilnius , Lithuania
| | - Justina Šapolaitė
- Mass Spectrometry Laboratory , Center for Physical Science and Technology , Savanoriu 231 , LT-02300 Vilnius , Lithuania
| | - Anna Sobek
- Department of Environmental Science and Analytical Chemistry , Stockholm University , Svante Arrhenius väg 8 , SE-106 91 Stockholm , Sweden
| | - Elena Gorokhova
- Department of Environmental Science and Analytical Chemistry , Stockholm University , Svante Arrhenius väg 8 , SE-106 91 Stockholm , Sweden
| | - Agnes M L Karlson
- Department of Environmental Science and Analytical Chemistry , Stockholm University , Svante Arrhenius väg 8 , SE-106 91 Stockholm , Sweden
- Department of Ecology, Environment and Plant Science , Stockholm University , Svante Arrhenius väg 20 , SE-114 18 Stockholm , Sweden
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49
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Gagne TO, Hyrenbach KD, Hagemann ME, Van Houtan KS. Trophic signatures of seabirds suggest shifts in oceanic ecosystems. SCIENCE ADVANCES 2018; 4:eaao3946. [PMID: 29457134 PMCID: PMC5812733 DOI: 10.1126/sciadv.aao3946] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Accepted: 01/12/2018] [Indexed: 06/08/2023]
Abstract
Pelagic ecosystems are dynamic ocean regions whose immense natural capital is affected by climate change, pollution, and commercial fisheries. Trophic level-based indicators derived from fishery catch data may reveal the food web status of these systems, but the utility of these metrics has been debated because of targeting bias in fisheries catch. We analyze a unique, fishery-independent data set of North Pacific seabird tissues to inform ecosystem trends over 13 decades (1890s to 2010s). Trophic position declined broadly in five of eight species sampled, indicating a long-term shift from higher-trophic level to lower-trophic level prey. No species increased their trophic position. Given species prey preferences, Bayesian diet reconstructions suggest a shift from fishes to squids, a result consistent with both catch reports and ecosystem models. Machine learning models further reveal that trophic position trends have a complex set of drivers including climate, commercial fisheries, and ecomorphology. Our results show that multiple species of fish-consuming seabirds may track the complex changes occurring in marine ecosystems.
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Affiliation(s)
- Tyler O. Gagne
- Monterey Bay Aquarium, 886 Cannery Row, Monterey, CA 93940, USA
| | - K. David Hyrenbach
- Hawaii Pacific University, 45-045 Kamehameha Highway, Kaneohe, HI 96744, USA
| | - Molly E. Hagemann
- Vertebrate Zoology Collections, Bernice Pauahi Bishop Museum, 1525 Bernice Street, Honolulu, HI 96817, USA
| | - Kyle S. Van Houtan
- Monterey Bay Aquarium, 886 Cannery Row, Monterey, CA 93940, USA
- Nicholas School of the Environment, Duke University, Box 90328, Durham, NC 27708, USA
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50
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Reconstructing variability in West Greenland ocean biogeochemistry and bowhead whale (Balaena mysticetus) food web structure using amino acid isotope ratios. Polar Biol 2017. [DOI: 10.1007/s00300-017-2136-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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