Experimental determination of magnesium isotope fractionation during higher plant growth

Bolou‐Bi, Emile B.; Poszwa, Anne; Leyval, Corinne; Vigier, Nathalie

doi:10.1016/j.gca.2010.02.010

Cited by 145 publications

(131 citation statements)

References 90 publications

(144 reference statements)

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“…Mg has a central role in plant physiology and possibly fractionates during photosynthesis (14). A recent study showed enrichment in light Mg isotopes from the roots to the stems and to the leaves with a maximum Δ leaf-root of 0.65‰ (23). Thus, at the scale of a single plant, potentially different dietary sources with distinct δ 26 Mg values exist.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, at the scale of a single plant, potentially different dietary sources with distinct δ 26 Mg values exist. In La Lopé, the analyzed plants fall in the δ 26 Mg range seen in other ecosystems (15,23,24) and cover the spectrum of values for mammal tooth enamel δ 26 Mg (below). Fruits, seeds, and roots are major constituents of the diet of many mammals (below).…”

Section: Discussionmentioning

confidence: 99%

“…Fruits, seeds, and roots are major constituents of the diet of many mammals (below). Although the Mg isotope composition of fruits and seeds is unknown, reported δ 26 Mg values for roots are high relative to those for leaves (23), and it could be hypothesized that herbivores focusing on such plant components would be indistinguishable from consumers at higher trophic positions. This could explain the relatively high δ 26 Mg values of P. porcus and M. sphinx but does not explain the high δ 26 Mg values of S. caffer nanus, not known for feeding on fruits, seeds, or roots.…”

Section: Discussionmentioning

confidence: 99%

“…The diet of P. porcus is considered omnivore and also includes seeds (16,18). Clearly, beyond the work of Bolou-Bi et al (23), the Mg isotope systematics of plant organs (root, shoot, stem, fruit, and seed) need to be investigated to better understand whether the preferential consumption of a given plant component would lead to an omnivore, or even a herbivore, being indistinguishable from a faunivore.…”

Section: The Ecological Significance Of Magnesium Isotopes In Mammalsmentioning

confidence: 99%

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Magnesium stable isotope ecology using mammal tooth enamel

Martin

Vance

Balter

2014

Proc. Natl. Acad. Sci. U.S.A.

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Geochemical inferences on ancient diet using bone and enamel apatite rely mainly on carbon isotope ratios (δ 13 C) and to a lesser extent on strontium/calcium (Sr/Ca) and barium/calcium (Ba/Ca) elemental ratios. Recent developments in nontraditional stable isotopes provide an unprecedented opportunity to use additional paleodietary proxies to disentangle complex diets such as omnivory. Of particular relevance for paleodietary reconstruction are metals present in large quantity in bone and enamel apatite, providing that biologically mediated fractionation processes are constrained. Calcium isotope ratios (δ 44 Ca) meet these criteria but exhibit complex ecological patterning. Stable magnesium isotope ratios (δ 26 Mg) also meet these criteria but a comprehensive understanding of its variability awaits new isotopic data. Here, 11 extant mammal species of known ecology from a single locality in equatorial Africa were sampled for tooth enamel and, together with vegetation and feces, analyzed for δ 26 Mg, δ 13 C, Sr/Ca, and Ba/Ca ratios. The results demonstrate that δ 26 Mg incorporated in tooth enamel becomes heavier from strict herbivores to omnivores/faunivores. Using data from experimentally raised sheep, we suggest that this 26 Mg enrichment up the trophic chain is due to a 26 Mg enrichment in muscle relative to bone. Notably, it is possible to distinguish omnivores from herbivores, using δ 26 Mg coupled to Ba/Ca ratios. The potential effects of metabolic and dietary changes on the enamel δ 26 Mg composition remain to be explored but, in the future, multiproxy approaches would permit a substantial refinement of dietary behaviors or enable accurate trophic reconstruction despite specimen-limited sampling, as is often the case for fossil assemblages.stable isotopes | magnesium | carbon | equatorial mammals | paleoecology R econstructing the diet of extinct vertebrates is a challenging task, especially when direct evidence such as stomach contents or feeding traces is lacking. Geochemical studies using the 13 C/ 12 C ratio, the strontium/calcium (Sr/Ca) ratio, and the barium/calcium (Ba/Ca) ratio of the mineral fraction of the skeleton, bone, and enamel apatite have proved as useful as other methodologies, such as morphofunctional and microwear analyses (e.g., refs.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: The Ecological Significance Of Magnesium Isotopes In Mammalsmentioning

confidence: 99%

See 2 more Smart Citations

Magnesium stable isotope ecology using mammal tooth enamel

Martin

Vance

Balter

2014

Proc. Natl. Acad. Sci. U.S.A.

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show abstract

“…Black et al, 2008;Bolou-Bi et al, 2010;Li et al, 2010;Wimpenny et al, 2010;Opfergelt et al, 2012Opfergelt et al, , 2014Pogge von Strandmann et al, 2008;Shirokova et al, 2013;Teng et al, 2010;Tipper et al, 2010;Hwang et al, 2012;Ilina et al, 2103;Mavromatis et al, 2012Mavromatis et al, , 2014. Such processes could lead to global riverine fluxes that are isotopically lighter in Mg compared to the homogenous chondritic composition of the Earth's mantle (Tipper et al, 2006).…”

Section: Introductionmentioning

confidence: 99%