Comparison of genetic variation between rare and common congeners of Dipodomys with estimates of contemporary and historical effective population size.

Autor: Halsey MK; Department of Biological Sciences, Texas Tech University, Lubbock, Texas, United States of America.; Department of Natural Resources Management, Texas Tech University, Lubbock, Texas, United States of America., Stuhler JD; Department of Natural Resources Management, Texas Tech University, Lubbock, Texas, United States of America., Bayona-Vásquez NJ; Department of Environmental Health Science, University of Georgia, Athens, Georgia, United States of America.; Institute of Bioinformatics, University of Georgia, Athens, Georgia, United States of America., Platt RN 2nd; Texas Biomedical Research Institute, San Antonio, Texas, United States of America., Goetze JR; Natural Sciences Department, Laredo College, Laredo, Texas, United States of America., Martin RE; Department of Biology, McMurry University, Abilene, Texas, United States of America., Matocha KG; Department of Biology, South Arkansas Community College, El Dorado, Arkansas, United States of America., Bradley RD; Department of Biological Sciences, Texas Tech University, Lubbock, Texas, United States of America.; Natural Science Research Laboratory, Museum of Texas Tech, Lubbock, Texas, United States of America., Stevens RD; Department of Natural Resources Management, Texas Tech University, Lubbock, Texas, United States of America.; Natural Science Research Laboratory, Museum of Texas Tech, Lubbock, Texas, United States of America., Ray DA; Department of Biological Sciences, Texas Tech University, Lubbock, Texas, United States of America.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2022 Sep 13; Vol. 17 (9), pp. e0274554. Date of Electronic Publication: 2022 Sep 13 (Print Publication: 2022).
DOI: 10.1371/journal.pone.0274554
Abstrakt: Species with low effective population sizes are at greater risk of extinction because of reduced genetic diversity. Such species are more vulnerable to chance events that decrease population sizes (e.g. demographic stochasticity). Dipodomys elator, (Texas kangaroo rat) is a kangaroo rat that is classified as threatened in Texas and field surveys from the past 50 years indicate that the distribution of this species has decreased. This suggests geographic range reductions that could have caused population fluctuations, potentially impacting effective population size. Conversely, the more common and widespread D. ordii (Ord's kangaroo rat) is thought to exhibit relative geographic and demographic stability. We assessed the genetic variation of D. elator and D. ordii samples using 3RAD, a modified restriction site associated sequencing approach. We hypothesized that D. elator would show lower levels of nucleotide diversity, observed heterozygosity, and effective population size when compared to D. ordii. We were also interested in identifying population structure within contemporary samples of D. elator and detecting genetic variation between temporal samples to understand demographic dynamics. We analyzed up to 61,000 single nucleotide polymorphisms. We found that genetic variability and effective population size in contemporary D. elator populations is lower than that of D. ordii. There is slight, if any, population structure within contemporary D. elator samples, and we found low genetic differentiation between spatial or temporal historical samples. This indicates little change in nuclear genetic diversity over 30 years. Results suggest that genetic diversity of D. elator has remained stable despite reduced population size and/or abundance, which may indicate a metapopulation-like system, whose fluctuations might counteract species extinction.
Competing Interests: The authors have declared that no competing interests exist.
Databáze: MEDLINE
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