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Frizzi F, Masoni A, Çelikkol M, Palchetti E, Ciofi C, Chelazzi G, Santini G. Serpentine soils affect heavy metal tolerance but not genetic diversity in a common Mediterranean ant. CHEMOSPHERE 2017; 180:326-334. [PMID: 28412490 DOI: 10.1016/j.chemosphere.2017.04.026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Revised: 04/03/2017] [Accepted: 04/06/2017] [Indexed: 06/07/2023]
Abstract
Natural habitats with serpentine soils are rich in heavy metal ions, which may significantly affect ecological communities. Exposure to metal pollutants results, for instance, in a reduction of population genetic diversity and a diffused higher tolerance towards heavy metals. In this study, we investigated whether chronic exposure to metals in serpentine soils affect accumulation patterns, tolerance towards metal pollutants, and genetic diversity in ants. In particular, we studied colonies of the common Mediterranean ant, Crematogaster scutellaris, along a contamination gradient consisting of two differently contaminated forests and a reference soil with no geogenic contamination. We first evaluated the metal content in both soil and ants' body. Then, we tested for tolerance towards metal pollutants by evaluating the mortality of ants fed with nickel (Ni) solutions of increasing concentrations. Finally, differences in genetic diversity among ants from different areas were assessed using eight microsatellite loci. Interestingly, a higher tolerance to nickel solutions was found in ants sampled in sites with intermediate levels of heavy metals. This may occur, because ants inhabiting strongly contaminated areas tend to accumulate higher amounts of contaminants. Additional ingestion of toxicants beyond the saturation threshold would lead to death. There was no difference in the genetic diversity among ant colonies sampled in different sites. This was probably the result of queen mediated gene flow during nuptial flights across uncontaminated and contaminated areas of limited geographical extent.
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Affiliation(s)
- Filippo Frizzi
- Università degli Studi di Firenze, Dipartimento di Biologia, Via Madonna del Piano, 6, 50019, Sesto Fiorentino, Florence, Italy.
| | - Alberto Masoni
- Università degli Studi di Firenze, Dipartimento di Biologia, Via Madonna del Piano, 6, 50019, Sesto Fiorentino, Florence, Italy
| | - Mine Çelikkol
- İstanbul University, Institute of Science, Department of Biology, PK 34134, Vezneciler, Fatih, İstanbul, Turkey
| | - Enrico Palchetti
- Università degli Studi di Firenze, Dipartimento di Scienze delle Produzioni Agroalimentari e dell'Ambiente (DISPAA), Piazzale delle Cascine, 18, 50144, Florence, Italy
| | - Claudio Ciofi
- Università degli Studi di Firenze, Dipartimento di Biologia, Via Madonna del Piano, 6, 50019, Sesto Fiorentino, Florence, Italy
| | - Guido Chelazzi
- Università degli Studi di Firenze, Dipartimento di Biologia, Via Madonna del Piano, 6, 50019, Sesto Fiorentino, Florence, Italy
| | - Giacomo Santini
- Università degli Studi di Firenze, Dipartimento di Biologia, Via Madonna del Piano, 6, 50019, Sesto Fiorentino, Florence, Italy
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