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在碎片化息地中的土壤关节动物中,基因流动的干扰和人口减少

Tammy Ai Tian Ho¹, Jeppe Bayer Pedersen¹, Anne Aagaard¹

¹Section for Genetics, Ecology & Evolution, Centre for Ecological Genetics, Department of Biology, Aarhus University, Aarhus, Denmark.

Molecular ecology

|June 11, 2025

概括

农业强化严重减少了昆虫种群规模和基因流动,导致遗传侵蚀. 即使是丰富的物种也面临着显著的人口下降和未来的遗传多样性损失,由于息地碎片化.

科学领域:

生态生态学生态生态学
人口遗传学人口遗传学
保护生物学保护生物学

背景情况:

由于土地使用的强化而导致的息地碎片化对生物多样性构成重大威胁.
昆虫种群特别容易受到息地碎片化的影响,原因是生长时间短,分散程度有限.
关于碎片化对丰富的昆虫物种的遗传影响的经验数据很少.

研究的目的:

调查农业用地密集化的人口遗传和人口统计影响对collembolan Entomobrya nicoleti.
测试"息地碎片化对遗传组成和人口动态产生负面影响"的假设.

主要方法:

结合了来自丹麦的历史农业用地数据,并对25个E. nicoleti种群进行了全基因组再测序.
分析了丰度数据,以评估息地适宜性和人口碎片化.
采用人口建模来估计有效的人口规模和基因流动.

主要成果:

农业扩张与息地适合性降低和人口分裂增加有关.
强化农业用地使用与有效人口规模的严重下降相吻合.
基因流量估计显示,与农业强化相关的近期急剧下降,这表明"漂流债务"预测了未来的遗传侵蚀.

结论:

即使是看似丰富的昆虫物种,在息地碎片化下,有效的种群规模和基因流量也会显著减少.
农业强化带来的人口变化预测了未来的遗传侵蚀,影响了长期的人口持续存在.
这项研究强调了息地分裂对昆虫种群的延迟但不可避免的遗传后果.

关键词:

关节类动物关节动物保护基因组学保护基因组学生态遗传学生态遗传学基因流是指基因的流动.景观的碎片化景观的碎片化人口基因组学人口基因组学

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