A comprehensive stalagmite investigation distinguishing anthropogenic and natural signals in Madagascar between 1680 and 1860.

Ny Riavo G Voarintsoa, Hallie M Fowler, Thomas J Lapen, Avotriniaina Z M Rakotovao, Ali Raza, Xianglei Li, Hai Cheng

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Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

Authors and funding

7 authors.

Ny Riavo G VoarintsoaDepartment of Earth and Atmospheric Sciences, University of Houston, Houston, TX, USA. nyriavo.voarintsoa@gmail.com.

Hallie M FowlerDepartment of Earth and Atmospheric Sciences, University of Houston, Houston, TX, USA.

Thomas J LapenDepartment of Earth and Atmospheric Sciences, University of Houston, Houston, TX, USA.

Avotriniaina Z M RakotovaoGeological Society of Madagascar, Antananarivo, Madagascar.

Ali RazaDepartment of Earth and Atmospheric Sciences, University of Houston, Houston, TX, USA.

Xianglei LiInstitute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing, China.

Hai ChengInstitute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, China.

Funding

UH-NRUF-National Research University Fund, NRUF FS 21 NSM R0506078

6 · The paper itself

Abstract

Disentangling anthropogenic from natural induced changes is difficult, but crucial to accurately assess the specific environmental impacts of humans' actions versus climate in the paleoclimate records. Here we combine a new set of proxies, including stable isotopes, element concentrations (mainly Mg, Sr, and U), and detailed mineralogy to better distinguish the impacts of these two factors in the stalagmite records. We studied the period between 1680 and 1860 CE because of the known historical events in Madagascar history (e.g., western colonization and the growth of Malagasy kingdom). This is an ideal period to study given these known events. Our data suggest that redox conditions during alternating wet and dry conditions is revealed by U/Ca covarying with δ

Indexed as

Anthropogenic EffectsCarbon IsotopesClimateHistory, 17th CenturyHistory, 18th CenturyHistory, 19th CenturyHumansMadagascarCarbon IsotopesAnthropogenic tracesElemental compositionMadagascarMicrostratigraphic logO and C isotopesRedox conditions

Identifiers

PMID40628907

DOI10.1038/s41598-025-09222-5

PMCPMC12238641

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