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Article

Conservation Genetics of Mediterranean Brown Trout in Central Italy (Latium): A Multi-Marker Approach

1
Department of Biology and Biotechnology “C. Darwin”, Sapienza University of Rome, 00161 Rome, Italy
2
Laboratory of Experimental Ecology and Aquaculture, Department of Biology, University of Rome Tor Vergata, 00133 Rome, Italy
3
Italian National Institute for Environmental Protection and Research (ISPRA), 00144 Rome, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: James S. Albert
Water 2022, 14(6), 937; https://doi.org/10.3390/w14060937
Received: 20 January 2022 / Revised: 11 March 2022 / Accepted: 15 March 2022 / Published: 17 March 2022
Brown trout is considered a complex of incipient species, including several phylogenetic lineages, whose natural distribution in the Mediterranean area has been altered, since the beginning of the 1900s, by massive introductions of domestic strains of Atlantic origin to support fisheries. Introduced trout naturalize in new suitable environments and extensively hybridize with native populations. Here, we characterized putatively neutral and adaptive genetic variability and population structure of Mediterranean brown trout from six river catchments in central peninsular Italy, as revealed by both mitochondrial (Control Region) and nuclear (microsatellites, LDH-C1, major histocompatibility complex) markers. We quantified the admixture of wild populations with hatchery strains and evaluated the effects of domestic trout introductions on shaping population genetics. Our analyses indicated: (1) a composite picture of genetic variability in the area, with the presence of all native Mediterranean trout mitochondrial lineages (“Adriatic”, “Mediterranean”, “marmoratus”), various frequencies of allochthonous genotypes and different rates of introgression among sampling sites; (2) asymmetric mito-nuclear introgression; (3) increasing nuclear marker diversity with increasing levels of admixture across populations; (4) strong population structure coupled with relatively low effective population size. Data allowed the identification of five management units and we propose specific actions to support ongoing and future conservation strategies within the examined area. View Full-Text
Keywords: Salmo trutta complex; Salmo ghigii; population structure; demography; anthropogenic introgression; microsatellites; control region; LDH-C1; major histocompatibility complex Salmo trutta complex; Salmo ghigii; population structure; demography; anthropogenic introgression; microsatellites; control region; LDH-C1; major histocompatibility complex
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MDPI and ACS Style

Rossi, A.R.; Talarico, L.; Petrosino, G.; Crescenzo, S.; Tancioni, L. Conservation Genetics of Mediterranean Brown Trout in Central Italy (Latium): A Multi-Marker Approach. Water 2022, 14, 937. https://doi.org/10.3390/w14060937

AMA Style

Rossi AR, Talarico L, Petrosino G, Crescenzo S, Tancioni L. Conservation Genetics of Mediterranean Brown Trout in Central Italy (Latium): A Multi-Marker Approach. Water. 2022; 14(6):937. https://doi.org/10.3390/w14060937

Chicago/Turabian Style

Rossi, Anna Rita, Lorenzo Talarico, Gerardo Petrosino, Simone Crescenzo, and Lorenzo Tancioni. 2022. "Conservation Genetics of Mediterranean Brown Trout in Central Italy (Latium): A Multi-Marker Approach" Water 14, no. 6: 937. https://doi.org/10.3390/w14060937

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