Montemagno, Francesco (2025) Metals and Microbes: The Influence of Trace Metals on Microbial Diversity and Function in Extreme Environments. [Tesi di dottorato]
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| Tipologia del documento: | Tesi di dottorato |
|---|---|
| Lingua: | English |
| Titolo: | Metals and Microbes: The Influence of Trace Metals on Microbial Diversity and Function in Extreme Environments |
| Autori: | Autore Email Montemagno, Francesco francesco.montemagno@unina.it |
| Data: | 18 Dicembre 2025 |
| Numero di pagine: | 227 |
| Istituzione: | Università degli Studi di Napoli Federico II |
| Dipartimento: | Biologia |
| Dottorato: | Biologia |
| Ciclo di dottorato: | 38 |
| Coordinatore del Corso di dottorato: | nome email Esposito, Sergio sergio.esposito@unina.it |
| Tutor: | nome email Giovannelli, Donato [non definito] |
| Data: | 18 Dicembre 2025 |
| Numero di pagine: | 227 |
| Parole chiave: | microbes, metals, trace elements, metabolisms, environment |
| Settori scientifico-disciplinari del MIUR: | Area 05 - Scienze biologiche > BIO/07 - Ecologia Area 05 - Scienze biologiche > BIO/19 - Microbiologia generale Area 04 - Scienze della terra > GEO/08 - Geochimica e vulcanologia |
| Informazioni aggiuntive: | Appartengo al 38°ciclo di dottorato di biologia |
| Depositato il: | 23 Dic 2025 07:28 |
| Ultima modifica: | 08 Ago 2026 03:24 |
| URI: | https://www.fedoa.unina.it/id/eprint/15906 |
Abstract
This thesis develops a cross-scale framework for how trace metals, mainly on copper, govern microbial community structure, enzyme allocation, and ecosystem-level biogeochemical fluxes across diverse environments. By coupling in situ geochemistry with meta-omics, metal-amended incubations, gas-flux measurements, and targeted cultivation, the work links environmental metal availability (shaped by pH, redox, ligands, and mineral surfaces) to cellular copper homeostasis and the deployment of key oxidoreductases that control element cycling. The thesis integrates three complementary lines of evidence: seasonal campaigns in Arctic permafrost that pair gas fluxes and fluid/soil chemistry with community profiling to resolve how thaw–refreeze dynamics and metal availability reorganize metabolic potential; controlled mesocosm experiments that impose iron and nutrient perturbations to move beyond correlation and test causal links between metal supply, community composition, and functional outputs; and a global comparative analysis spanning deeply sourced seeps and a broad geothermal dataset, used to map the diversity, distribution, and environmental predictors of copper-binding proteins over wide pH and temperature ranges and across contrasting tectonic and geochemical contexts. Complementary cultivation isolates extremophiles adapted to high-temperature or alkaline, metal-rich niches, underscoring how metal speciation and physicochemical constraints shape realized microbial strategies. Collectively, the results argue that metal availability is not a peripheral modifier but a primary axis of microbial niche definition and biogeochemical control, offering a predictive basis for incorporating trace-metal constraints into Earth-system thinking and informing applications from greenhouse gases mitigation to bioremediation and bioleaching.
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