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性别和栖息地景观影响大型穴居哺乳动物裸鼻袋熊的空间遗传变异。

Sex and landscape influence spatial genetic variation in a large fossorial mammal, the Bare-nosed Wombat ().

作者信息

Tan Woei Jiun, Carver Scott, Martin Alynn M, Fountain-Jones Nicholas M, Proft Kirstin M, Burridge Christopher P

机构信息

Discipline of Biological Sciences, University of Tasmania, Private Bag 55, Hobart, TAS 7001, Australia.

Odum School of Ecology, University of Georgia, Athens, GA 30602, United States.

出版信息

J Mammal. 2024 Mar 27;105(3):481-489. doi: 10.1093/jmammal/gyae017. eCollection 2024 Jun.

Abstract

Dispersal is an important process that is widely studied across species, and it can be influenced by intrinsic and extrinsic factors. Intrinsic factors commonly assessed include the sex and age of individuals, while landscape features are frequently-tested extrinsic factors. Here, we investigated the effects of both sex and landscape composition and configuration on genetic distances among bare-nosed wombats ()-one of the largest fossorial mammals in the world and subject to habitat fragmentation, threats from disease, and human persecution including culling as an agricultural pest. We analyzed a data set comprising 74 Tasmanian individuals (30 males and 44 females), genotyped for 9,064 single-nucleotide polymorphisms. We tested for sex-biased dispersal and the influence of landscape features on genetic distances including land use, water, vegetation, elevation, and topographic ruggedness. We detected significant female-biased dispersal, which may be related to females donating burrows to their offspring due to the energetic cost of excavation, given their large body sizes. Land use, waterbodies, and elevation appeared to be significant landscape predictors of genetic distance. Land use potentially reflects land clearing and persecution over the last 200 years. If our findings based on a limited sample size are valid, retention and restoration of nonanthropogenic landscapes in which wombats can move and burrow may be important for gene flow and maintenance of genetic diversity.

摘要

扩散是一个重要过程,在跨物种研究中受到广泛关注,它会受到内在和外在因素的影响。通常评估的内在因素包括个体的性别和年龄,而景观特征则是经常被检验的外在因素。在这里,我们研究了性别以及景观组成和格局对袋熊(世界上最大的穴居哺乳动物之一,面临栖息地破碎化、疾病威胁以及包括作为农业害虫被捕杀在内的人类迫害)遗传距离的影响。我们分析了一个包含74只塔斯马尼亚袋熊个体(30只雄性和44只雌性)的数据集,对9064个单核苷酸多态性进行了基因分型。我们测试了性别偏向扩散以及景观特征对遗传距离的影响,包括土地利用、水、植被、海拔和地形崎岖度。我们检测到显著的雌性偏向扩散,这可能与雌性由于挖掘的能量成本(鉴于其体型较大)而将洞穴捐赠给后代有关。土地利用、水体和海拔似乎是遗传距离的重要景观预测因子。土地利用可能反映了过去200年的土地开垦和迫害情况。如果我们基于有限样本量的研究结果是有效的,那么保留和恢复袋熊能够移动和挖掘洞穴的非人为景观对于基因流动和遗传多样性的维持可能很重要。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e5f9/11130529/f7273aeadd9d/gyae017_fig1.jpg

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