Discrimination of unprocessed cotton on the basis of geographic origin using multi-element stable isotope signatures

Meier‐Augenstein, Wolfram; Kemp, Helen; Schenk, Emily R.; Almirall, José R.

doi:10.1002/rcm.6811

Cited by 19 publications

(13 citation statements)

References 30 publications

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“…Until now, clustering of isoscapes into functionally relevant spatial groups was mainly done for tracing animal movement [ 28 , 29 ], to better understand trophic interactions [ 30 ], and to determine origins of biological materials at country level (e.g. [ 31 ]). However, detecting spatial patterns with cluster analysis is not trivial because simple cluster algorithms such as hierarchical clustering always produce some sort of clustering even in the absence of any real structure [ 41 ].…”

Section: Discussionmentioning

confidence: 99%

“…Clustering of georeferenced isotopic values (isoscapes) has successfully been used for example to track animal migration on a continental scale [ 28 , 29 ], to understand trophic interactions [ 30 ], and to determine origins of biological materials on country level (e.g. [ 31 ]). However, clustering of isoscapes has mainly been applied within contexts of zoology and/ or geographic assignment while no examples with plant ecological scope are known to us from the literature.…”

Section: Introductionmentioning

confidence: 99%

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A Spatially Explicit Dual-Isotope Approach to Map Regions of Plant-Plant Interaction after Exotic Plant Invasion

2016

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Understanding interactions between native and invasive plant species in field settings and quantifying the impact of invaders in heterogeneous native ecosystems requires resolving the spatial scale on which these processes take place. Therefore, functional tracers are needed that enable resolving the alterations induced by exotic plant invasion in contrast to natural variation in a spatially explicit way. 15N isoscapes, i.e., spatially referenced representations of stable nitrogen isotopic signatures, have recently provided such a tracer. However, different processes, e.g. water, nitrogen or carbon cycles, may be affected at different spatial scales. Thus multi-isotope studies, by using different functional tracers, can potentially return a more integrated picture of invader impact. This is particularly true when isoscapes are submitted to statistical methods suitable to find homogeneous subgroups in multivariate data such as cluster analysis. Here, we used model-based clustering of spatially explicit foliar δ15N and δ13C isoscapes together with N concentration of a native indicator species, Corema album, to map regions of influence in a Portuguese dune ecosystem invaded by the N2-fixing Acacia longifolia. Cluster analysis identified regions with pronounced alterations in N budget and water use efficiency in the native species, with a more than twofold increase in foliar N, and δ13C and δ15N enrichment of up to 2‰ and 8‰ closer to the invader, respectively. Furthermore, clusters of multiple functional tracers indicated a spatial shift from facilitation through N addition in the proximity of the invader to competition for resources other than N in close contact. Finding homogeneous subgroups in multi-isotope data by means of model-based cluster analysis provided an effective tool for detecting spatial structure in processes affecting plant physiology and performance. The proposed method can give an objective measure of the spatial extent of influence of plant-plant interactions, thus improving our understanding of spatial pattern and interactions in plant communities.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Spatially Explicit Dual-Isotope Approach to Map Regions of Plant-Plant Interaction after Exotic Plant Invasion

2016

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“…Several reviews have discussed forensic applications of IRMS (105)(106)(107)(108), and Meier-Augenstein (109) provided even more comprehensive coverage in his recent book Stable Isotope Forensics. In forensic applications, isotope ratio analysis provides information about the natural or synthetic origins of scheduled drugs (110)(111)(112)(113)(114)(115)(116)(117)(118)(119)(120), organic and inorganic explosives (76,121,122), petroleum hydrocarbons (such as in ignitable liquids) (65,66,(123)(124)(125)(126), and various other forensic materials (such as fibers, matches, and paint chips) (127)(128)(129)(130)(131). The ability to analyze hard and soft human tissue has also provided helpful investigative leads about the geographic origins of humans, especially in John Doe and Jane Doe cases where fingerprints, DNA, and dental records are not found in databases (132)(133)(134)(135)(136)(137)(138)(139).…”

Section: Stable Isotope Analysismentioning

confidence: 99%

Forensic Mass Spectrometry

Hoffmann¹,

Jackson

2015

Annual Rev. Anal. Chem.

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Developments in forensic mass spectrometry tend to follow, rather than lead, the developments in other disciplines. Examples of techniques having forensic potential born independently of forensic applications include ambient ionization, imaging mass spectrometry, isotope ratio mass spectrometry, portable mass spectrometers, and hyphenated chromatography-mass spectrometry instruments, to name a few. Forensic science has the potential to benefit enormously from developments that are funded by other means, if only the infrastructure and personnel existed to adopt, validate, and implement the new technologies into casework. Perhaps one unique area in which forensic science is at the cutting edge is in the area of chemometrics and the determination of likelihood ratios for the evaluation of the weight of evidence. Such statistical techniques have been developed most extensively for ignitable-liquid residue analyses and isotope ratio analysis. This review attempts to capture the trends, motivating forces, and likely impact of developing areas of forensic mass spectrometry, with the caveat that none of this research is likely to have any real impact in the forensic community unless: (a) The instruments developed are turned into robust black boxes with red and green lights for positives and negatives, respectively, or (b) there are PhD graduates in the workforce who can help adopt these sophisticated techniques.

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“…Ever more stringent product labelling requirements demand the supply chain to furnish proof of geographic provenance beyond merely paper-based audit trails. Using hierarchical cluster analysis (HCA) of multivariate stable isotope abundance data, a study comparing 17 US cotton and 15 non-US cotton samples was able to cluster 15 of the 17 US cotton samples in one group [48]. However, HCA was not able to resolve cotton from countries as far as apart as, for example, Pakistan and Senegal.…”

Section: Plant Productsmentioning

confidence: 99%

From stable isotope ecology to forensic isotope ecology — Isotopes’ tales

Meier‐Augenstein

2019

Forensic Science International

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Discrimination of unprocessed cotton on the basis of geographic origin using multi-element stable isotope signatures

Abstract: Hierarchical cluster analysis of multivariate stable isotope signatures of raw cotton showed great promise as an analytical tool to differentiate between US and non-US cotton and possibly even to be able to group unprocessed cotton according to geographic origin.

Cited by 19 publications

References 30 publications

A Spatially Explicit Dual-Isotope Approach to Map Regions of Plant-Plant Interaction after Exotic Plant Invasion

A Spatially Explicit Dual-Isotope Approach to Map Regions of Plant-Plant Interaction after Exotic Plant Invasion

Forensic Mass Spectrometry

From stable isotope ecology to forensic isotope ecology — Isotopes’ tales

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