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Title: Genomic data detect corresponding signatures of population size change on an ecological time scale in two salamander species

Abstract

Abstract Understanding the demography of species over recent history (e.g. <100 years) is critical in studies of ecology and evolution, but records of population history are rarely available. Surveying genetic variation is a potential alternative to census‐based estimates of population size, and can yield insight into the demography of a population. However, to assess the performance of genetic methods, it is important to compare their estimates of population history to known demography. Here, we leveraged the exceptional resources from a wetland with 37 years of amphibian mark–recapture data to study the utility of genetically based demographic inference on salamander species with documented population declines ( Ambystoma talpoideum ) and expansions ( A. opacum ), patterns that have been shown to be correlated with changes in wetland hydroperiod. We generated dd RAD data from two temporally sampled populations of A. opacum (1993, 2013) and A. talpoideum (1984, 2011) and used coalescent‐based demographic inference to compare alternate evolutionary models. For both species, demographic model inference supported population size changes that corroborated mark–recapture data. Parameter estimation in A. talpoideum was robust to our variations in analytical approach, while estimates for A. opacum were highly inconsistent, tempering our confidence in detecting a demographic trend in this species. Overall, our robust resultsmore » in A. talpoideum suggest that genome‐based demographic inference has utility on an ecological scale, but researchers should also be cognizant that these methods may not work in all systems and evolutionary scenarios. Demographic inference may be an important tool for population monitoring and conservation management planning.« less

Authors:
ORCiD logo [1];  [2];  [2];  [3];  [1]
  1. Univ. of Kentucky, Lexington, KY (United States)
  2. Univ. of Georgia, Aiken, SC (United States)
  3. Florida State Univ., Tallahassee, FL (United States)
Publication Date:
Research Org.:
Savannah River Site (SRS), Aiken, SC (United States). Savannah River Ecology Lab. (SREL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1819060
Alternate Identifier(s):
OSTI ID: 1401039
Grant/Contract Number:  
FC09-07SR22506; DE‐FC09‐07SR22506
Resource Type:
Accepted Manuscript
Journal Name:
Molecular Ecology
Additional Journal Information:
Journal Volume: 26; Journal Issue: 4; Journal ID: ISSN 0962-1083
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; nonmodel organisms; demographic inference; temporal samples; amphibian decline; genetic monitoring; coalescent; Ambystoma opacum; Ambystoma talpoideum

Citation Formats

Nunziata, Schyler O., Lance, Stacey L., Scott, David E., Lemmon, Emily Moriarty, and Weisrock, David W. Genomic data detect corresponding signatures of population size change on an ecological time scale in two salamander species. United States: N. p., 2016. Web. doi:10.1111/mec.13988.
Nunziata, Schyler O., Lance, Stacey L., Scott, David E., Lemmon, Emily Moriarty, & Weisrock, David W. Genomic data detect corresponding signatures of population size change on an ecological time scale in two salamander species. United States. https://doi.org/10.1111/mec.13988
Nunziata, Schyler O., Lance, Stacey L., Scott, David E., Lemmon, Emily Moriarty, and Weisrock, David W. Tue . "Genomic data detect corresponding signatures of population size change on an ecological time scale in two salamander species". United States. https://doi.org/10.1111/mec.13988. https://www.osti.gov/servlets/purl/1819060.
@article{osti_1819060,
title = {Genomic data detect corresponding signatures of population size change on an ecological time scale in two salamander species},
author = {Nunziata, Schyler O. and Lance, Stacey L. and Scott, David E. and Lemmon, Emily Moriarty and Weisrock, David W.},
abstractNote = {Abstract Understanding the demography of species over recent history (e.g. <100 years) is critical in studies of ecology and evolution, but records of population history are rarely available. Surveying genetic variation is a potential alternative to census‐based estimates of population size, and can yield insight into the demography of a population. However, to assess the performance of genetic methods, it is important to compare their estimates of population history to known demography. Here, we leveraged the exceptional resources from a wetland with 37 years of amphibian mark–recapture data to study the utility of genetically based demographic inference on salamander species with documented population declines ( Ambystoma talpoideum ) and expansions ( A. opacum ), patterns that have been shown to be correlated with changes in wetland hydroperiod. We generated dd RAD data from two temporally sampled populations of A. opacum (1993, 2013) and A. talpoideum (1984, 2011) and used coalescent‐based demographic inference to compare alternate evolutionary models. For both species, demographic model inference supported population size changes that corroborated mark–recapture data. Parameter estimation in A. talpoideum was robust to our variations in analytical approach, while estimates for A. opacum were highly inconsistent, tempering our confidence in detecting a demographic trend in this species. Overall, our robust results in A. talpoideum suggest that genome‐based demographic inference has utility on an ecological scale, but researchers should also be cognizant that these methods may not work in all systems and evolutionary scenarios. Demographic inference may be an important tool for population monitoring and conservation management planning.},
doi = {10.1111/mec.13988},
journal = {Molecular Ecology},
number = 4,
volume = 26,
place = {United States},
year = {Tue Dec 27 00:00:00 EST 2016},
month = {Tue Dec 27 00:00:00 EST 2016}
}

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