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Demographic history of the fragmented yellow-throated bulbul (Pycnonotus xantholaemus) population in the Deccan Peninsula, India
Endangered Species Research ( IF 2.6 ) Pub Date : 2020-10-08 , DOI: 10.3354/esr01062
A Jha 1 , K Vasudevan 1
Affiliation  

The yellow-throated bulbul (YTB) is an endemic passerine restricted to scrub forests along hill slopes with exposed rocky outcrops in the Deccan Peninsula, India. It is found in small, discontinuous populations and is vulnerable to extinction due to ongoing habitat loss and subsequent population decline. To assess the genetic connectivity and past demography, we sequenced 1050 nucleotide base pairs of the mitochondrial control region of 60 individuals that represent distinct populations in the geographic range of the species. We recovered 39 haplotypes defined by 81 variable sites. Haplotype diversity was high with low nucleotide diversity, suggesting rapid population growth from a founder population with a small effective population size. The negative values of Tajima’s D and Fu’s Fs and small positive value of Ramos-Onsins and Rozas’ R2 suggest deviation from neutrality and population expansion. The haplotype network and demographic ex pansion parameters further suggest historical population expansion. Mismatch analysis statistics and Bayesian skyline plots estimate population expansion during the late Pleistocene. Al though the species presently occurs in small, disconnected we found no structuring of the population. Dispersal events are the most likely explanation for the absence of genetic structuring in the YTB population. These results represent important data for the design of a conservation plan for this endemic and globally threatened species.

中文翻译:

印度德干半岛支离破碎的黄喉鹎 (Pycnonotus xantholaemus) 种群的人口统计历史

黄喉鹎 (YTB) 是一种地方性雀形目鸟类,仅限于印度德干半岛裸露岩石露头的山坡上的灌木林。它存在于不连续的小种群中,并且由于持续的栖息地丧失和随后的种群下降而容易灭绝。为了评估遗传连通性和过去的人口统计学,我们对代表物种地理范围内不同种群的 60 个个体的线粒体控制区域的 1050 个核苷酸碱基对进行了测序。我们恢复了由 81 个可变位点定义的 39 个单倍型。单倍型多样性高,核苷酸多样性低,这表明从有效种群规模小的创始种群快速增长。Tajima 的 D 和 Fu 的 Fs 的负值以及 Ramos-Onsins 和 Rozas 的 R2 的小正值表明偏离中立和人口扩张。单倍型网络和人口扩张参数进一步表明历史人口扩张。失配分析统计数据和贝叶斯天际线图估计更新世晚期的人口扩张。尽管该物种目前以小规模、不连贯的方式出现,但我们没有发现种群结构。散布事件是 YTB 种群中缺乏遗传结构的最可能解释。这些结果代表了为这种地方性和全球受威胁物种设计保护计划的重要数据。单倍型网络和人口扩张参数进一步表明历史人口扩张。失配分析统计数据和贝叶斯天际线图估计更新世晚期的人口扩张。尽管该物种目前以小规模、不连贯的方式出现,但我们没有发现种群结构。散布事件是 YTB 种群中缺乏遗传结构的最可能解释。这些结果代表了为这种地方性和全球受威胁物种设计保护计划的重要数据。单倍型网络和人口扩张参数进一步表明历史人口扩张。失配分析统计数据和贝叶斯天际线图估计更新世晚期的人口扩张。尽管该物种目前以小规模、不连贯的方式出现,但我们没有发现种群结构。散布事件是 YTB 种群中缺乏遗传结构的最可能解释。这些结果代表了为这种地方性和全球受威胁物种设计保护计划的重要数据。散布事件是 YTB 种群中缺乏遗传结构的最可能解释。这些结果代表了为这种地方性和全球受威胁物种设计保护计划的重要数据。散布事件是 YTB 种群中缺乏遗传结构的最可能解释。这些结果代表了为这种地方性和全球受威胁物种设计保护计划的重要数据。
更新日期:2020-10-08
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