Maintenance of Genetic Diversity Despite Population Fluctuations in the Lesser Prairie-Chicken (Tympanuchus pallidicinctus)

IF 2.3 2区 生物学 Q2 ECOLOGY Ecology and Evolution Pub Date : 2025-01-23 DOI:10.1002/ece3.70879
Andrew J. Lawrence, Scott A. Carleton, Sara J. Oyler-McCance, Randy W. DeYoung, Clay T. Nichols, Timothy F. Wright
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Abstract

Assessments of genetic diversity, structure, history, and effective population size (Ne) are critical for the conservation of imperiled populations. The lesser prairie-chicken (Tympanuchus pallidicinctus) has experienced declines due to habitat loss, degradation, and fragmentation in addition to substantial population fluctuations with unknown effects on genetic diversity. Our objectives were to: (i) compare genetic diversity across three temporally discrete sampling periods (2002, 2007–2010, and 2013–2014) that are characterized by low or high population abundance; (ii) examine genetic diversity at lek and lek cluster spatial scales; (ii) identify potential bottlenecks and characterize genetic structure and relatedness; and (iii) estimate the regional Ne. We analyzed 194 samples across the shinnery oak prairie region of eastern New Mexico and western Texas using 13 microsatellite loci. Mean heterozygosity, allelic richness, and inbreeding coefficient were not significantly different between discrete sampling periods, suggesting that this population has maintained its genetic diversity across the sampled population fluctuations. We did not detect genetic structure using multiple Bayesian clustering approaches. Furthermore, there was no support for recent genetic bottlenecks, and we estimated that the Ne ranged from 229.5 (pcrit = 0.05, 95% CIs = 121.2–1023.1) to 349.1 (pcrit = 0.02, 95% CIs = 176.4–2895.2) during our final sampling period (2013–2014). Although we provide evidence for gene flow within this region, continued habitat loss and fragmentation that leads to population declines and isolation could increase the risk of genetic consequences. Continued monitoring of genetic diversity and increasing available habitat that supports robust populations of lesser prairie-chickens may improve the likelihood of the species' persistence.

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小草原鸡种群波动下遗传多样性的维持。
遗传多样性、结构、历史和有效种群大小(N e)的评估对濒危种群的保护至关重要。小草原鸡(Tympanuchus pallidicinctus)由于栖息地丧失、退化和破碎化,以及对遗传多样性影响未知的大量种群波动,已经经历了数量下降。我们的目标是:(i)比较三个暂时离散的采样期(2002年、2007-2010年和2013-2014年)的遗传多样性,这些采样期的特征是种群丰度低或高;(ii)研究韭葱和韭葱簇空间尺度上的遗传多样性;(ii)确定潜在的瓶颈并描述遗传结构和相关性;我们使用13个微卫星位点分析了新墨西哥州东部和德克萨斯州西部的橡树草原地区的194个样本。平均杂合度、等位基因丰富度和近交系数在不同采样周期间差异不显著,表明该种群在不同采样周期内保持了遗传多样性。我们没有使用多重贝叶斯聚类方法检测遗传结构。此外,没有证据支持最近的遗传瓶颈,我们估计在我们最后的采样期(2013-2014),N e在229.5 (p临界值= 0.05,95% ci = 121.2-1023.1)到349.1 (p临界值= 0.02,95% ci = 176.4-2895.2)之间。虽然我们提供了该区域内基因流动的证据,但持续的栖息地丧失和碎片化导致种群减少和隔离可能会增加遗传后果的风险。持续监测遗传多样性和增加支持小草原鸡健壮种群的可用栖息地可能会提高该物种持续存在的可能性。
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来源期刊
CiteScore
4.40
自引率
3.80%
发文量
1027
审稿时长
3-6 weeks
期刊介绍: Ecology and Evolution is the peer reviewed journal for rapid dissemination of research in all areas of ecology, evolution and conservation science. The journal gives priority to quality research reports, theoretical or empirical, that develop our understanding of organisms and their diversity, interactions between them, and the natural environment. Ecology and Evolution gives prompt and equal consideration to papers reporting theoretical, experimental, applied and descriptive work in terrestrial and aquatic environments. The journal will consider submissions across taxa in areas including but not limited to micro and macro ecological and evolutionary processes, characteristics of and interactions between individuals, populations, communities and the environment, physiological responses to environmental change, population genetics and phylogenetics, relatedness and kin selection, life histories, systematics and taxonomy, conservation genetics, extinction, speciation, adaption, behaviour, biodiversity, species abundance, macroecology, population and ecosystem dynamics, and conservation policy.
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