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- W1548637697 abstract "Metalliferous soils provide very restrictive habitats for plants due to phytotoxicity, resulting in severe selection pressures. Species comprising heavy-metal plant communities are genetically altered ecotypes with specific tolerances to, e.g., cadmium, copper, lead, nickel, zinc and arsenic, adapted through microevolutionary processes. Evolution of metal tolerance takes place at each specific site (Ernst 2006). A high degree of metal tolerance depends on the bioavailable fraction of the metal(loids) in the soil and the type of mineralization. At extremely high soil metal concentrations, especially on polymetallic soils, even metal-tolerant genotypes are not able to evolve extreme tolerances to several heavy metals simultaneously. Adapted genotypes are the result of the Darwinian natural selection of metal-tolerant individuals selected from surrounding non-metalliferous populations (Antonovics et al. 1971; Baker 1987; Ernst 2006). Such selection can lead ultimately to speciation and the evolution of endemic taxa. Heavy-metal tolerance was first reported by Prat (1934) in Silene dioica and demonstrated experimentally in grasses by Bradshaw and co-workers in Agrostis spp. and by Wilkins in Festuca ovina in the late 1950s and 1960s (see Antonovics et al. 1971) and from the early 1950s onwards in the herb Silene vulgaris by Baumeister and co-workers (see Ernst 1974). Metal-tolerant plants avoid intoxication by an excess of heavy metals by means of special cellular mechanisms, as long as the soil metal levels do not exceed the levels of metal tolerance (Ernst 1974; Ernst et al. 2004). They can thus thrive on soils that are too toxic for non-adapted species and ecotypes." @default.
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- W1548637697 date "2010-02-18" @default.
- W1548637697 modified "2023-10-02" @default.
- W1548637697 title "Metallophytes: the unique biological resource, its ecology and conservational status in Europe, central Africa and Latin America" @default.
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- W1548637697 doi "https://doi.org/10.1017/cbo9780511805561.003" @default.
- W1548637697 hasPublicationYear "2010" @default.
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