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Agricultural intensification alters marbled newt genetic diversity and gene flow through density and dispersal reduction
- Source :
- Molecular Ecology, Molecular Ecology, Wiley, 2022, ⟨10.1111/mec.16236⟩, Molecular Ecology, Wiley, In press, ⟨10.1111/mec.16236⟩
- Publication Year :
- 2021
-
Abstract
- International audience; Recent agricultural intensification threatens global biodiversity with amphibians being one of the most impacted groups. Because of their biphasic life cycle, amphibians are particularly vulnerable to habitat loss and fragmentation that often result in small, isolated populations and loss of genetic diversity. Here, we studied how landscape heterogeneity affects genetic diversity, gene flow and demographic parameters in the marbled newt, Triturus marmoratus, over a hedgerow network landscape in Western France. While the northern part of the study area consists of preserved hedged farm-land, the southern part was more profoundly converted for intensive arable crops production after WWII. Based on 67 sampled ponds and 10 microsatellite loci, we characterized regional population genetic structure and evaluated the correlation between landscape variables and (i) local genetic diversity using mixed models and (ii) genetic distance using multiple regression methods and commonality analysis. We identified a single genetic population characterized by a spatially heterogeneous isolation- by- distance pattern. Pond density in the surrounding landscape positively affected local genetic diversity while arable crop land cover negatively affected gene flow and connectivity. We used demographic inferences to quantitatively assess dif-ferences in effective population density and dispersal between the contrasted land-scapes characterizing the northern and southern parts of the study area. Altogether, results suggest recent land conversion affected T. marmoratus through reduction in both effective population density and dispersal due to habitat loss and reduced connectivity.
- Subjects :
- 0106 biological sciences
Gene Flow
Triturus marmoratus
[SDV]Life Sciences [q-bio]
Population
Biology
010603 evolutionary biology
01 natural sciences
microsatellites
03 medical and health sciences
demographic inferences
Effective population size
Genetics
Animals
education
dispersal
ComputingMilieux_MISCELLANEOUS
Ecology, Evolution, Behavior and Systematics
Ecosystem
030304 developmental biology
2. Zero hunger
0303 health sciences
education.field_of_study
Genetic diversity
Ecology
Genetic Variation
landscape genetics
genetic diversity
15. Life on land
Salamandridae
Habitat destruction
Genetics, Population
Genetic distance
Genetic structure
[SDE]Environmental Sciences
Biological dispersal
Arable land
Microsatellite Repeats
Subjects
Details
- ISSN :
- 1365294X and 09621083
- Volume :
- 31
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Molecular ecologyREFERENCES
- Accession number :
- edsair.doi.dedup.....83f4dfd10b479594f693bcb2bd9bdf91