Persistent panmixia despite extreme habitat loss and population decline in the threatened tricolored blackbird (Agelaius tricolor)

Autor: Annabel C. Beichman, Pooneh Kalhori, Kristen Ruegg, Thomas B. Smith, Rachael A. Bay, Jasmine Rajbhandary, Kelly R. Barr
Jazyk: angličtina
Rok vydání: 2020
Předmět:
0106 biological sciences
0301 basic medicine
Conservation genetics
threatened species
Life on Land
habitat loss
lcsh:Evolution
Biology
010603 evolutionary biology
01 natural sciences
03 medical and health sciences
Medicinal and Biomolecular Chemistry
Effective population size
rural saving and credit cooperatives
lcsh:QH359-425
Agelaius
life cycle
Genetics
genomics
Ecology
Evolution
Behavior and Systematics
DEA window analysis
Panmixia
Evolutionary Biology
Extinction
Ecology
Human Genome
demographic modeling
technical efficiency
Original Articles
entrepreneurial class
biology.organism_classification
Population decline
030104 developmental biology
Habitat destruction
conservation genetics
Threatened species
Original Article
General Agricultural and Biological Sciences
gene flow
deposit mobilization
effective population size
Zdroj: Evolutionary Applications
Evolutionary applications, vol 14, iss 3
Evolutionary Applications, Vol 14, Iss 3, Pp 674-684 (2021)
ISSN: 1752-4571
Popis: Habitat loss and alteration has driven many species into decline, often to the point of requiring protection and intervention to avert extinction. Genomic data provide the opportunity to inform conservation and recovery efforts with details about vital evolutionary processes with a resolution far beyond that of traditional genetic approaches. The tricolored blackbird (Agelaius tricolor) has suffered severe losses during the previous century largely due to anthropogenic impacts on their habitat. Using a dataset composed of a whole genome paired with reduced representation libraries (RAD-Seq) from samples collected across the species' range, we find evidence for panmixia using multiple methods, including PCA (no geographic clustering), admixture analyses (ADMIXTURE and TESS conclude K=1), and comparisons of genetic differentiation (average FST=0.029). Demographic modeling approaches recovered an ancient decline that had a strong impact on genetic diversity but did not detect any effect from the known recent decline. We also did not detect any evidence for selection, and hence adaptive variation, at any site, either geographic or genomic. These results indicate that species continues to have high vagility across its range despite population decline and habitat loss and should be managed as a single unit.
Databáze: OpenAIRE
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