gray wolf

  • 文章类型: Journal Article
    放牧是俾路支省的重要做法,为经济和文化做出贡献。俾路支省的畜牧业非常重要,提供20%的全国库存。大型捕食者和它们的猎物种类,包括牲畜,在这些山区景观中共存了几个世纪。本研究的目的是调查大型捕食者对Bal路支省两个地区的生计和捕食者保护的影响,巴基斯坦。2019年7月至9月进行了人类与食肉动物冲突调查,收集了选定研究区域311名居民的数据。在一年的时间里,研究区的大型捕食者共捕食了876只牲畜,包括560只山羊,292只羊,19头牛,五头驴。灰狼是主要的捕食者,占牲畜掠夺的66.3%,其次是caracal(24.3%),亚洲狼(8.9%),和条纹鬣狗(0.6%)。经济损失总额为78,694美元。总的来说,80%的受访者对狼有负面看法,而对加拉加斯的看法为24.4%。只有20.6%的受访者知道保护食肉动物的重要性。研究区域中食肉动物对牲畜的掠夺使人们对这些动物产生了负面看法。人们对保护食肉动物物种的重要性及其在生态系统中的作用缺乏认识。这种缺乏了解最终导致对捕食者种群的不利影响。当务之急是通过社区会议提高人们对食肉动物的生态意义的认识,在教育机构举办研讨会,并向牧民提供有关有效牲畜饲养方法的基础教育。
    Livestock herding is a vital practice in Balochistan, contributing to the economy and culture. The livestock sector is significant in Balochistan, providing 20% of the national stock. Large predators and their prey species, including livestock, have coexisted in these mountainous landscapes for centuries. The aim of the present research is to investigate the impacts of livestock depredation by large predators on livelihoods and predator conservation in two districts of Balochistan, Pakistan. A human-carnivore conflict survey was conducted from July to September 2019, collecting data from 311 residents in a selected study area. Large predators in the study area preyed on a total of 876 livestock during a one-year period, including 560 goats, 292 sheep, 19 cows, and 5 donkeys. The gray wolf is the leading predator, responsible for 66.3% of livestock depredation, followed by the caracal (24.3%), Asiatic jackal (8.9%), and striped hyena (0.6%). The total economic loss was USD 78,694. Overall, 80% of respondents had a negative perception of wolves compared to 24.4% for caracals. Only 20.6% of respondents knew about the importance of conserving carnivores. Livestock depredation by carnivores in the study area created a negative perception of these animals among people. There is a lack of awareness about the importance of conserving carnivore species and their role in the ecosystem. This lack of understanding has ultimately led to detrimental effects on predator populations. It is imperative to raise awareness among people about the ecological significance of carnivores through community meetings, seminars in educational institutions, and providing basic education to herders about effective livestock guarding practices.
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  • 文章类型: Journal Article
    灰狼(Canis狼疮)是在晚更新世大动物灭绝中幸存下来的少数大型食肉动物之一。由于其复杂的混合历史和广泛的地理范围,灰狼亚种的数量及其系统发育关系仍然知之甚少。这里,我们对从印度半岛收集的灰狼进行全基因组测序,该灰狼的表型与印度以外的灰狼不同。基因组分析表明,印度灰狼是一个进化上独特的谱系,与110万年前的其他现存灰狼谱系不同。人口统计分析表明,自从与其他灰狼分离以来,印度狼的数量持续下降,今天,遗传多样性极低。我们还发现了印度狼和包括非洲狼在内的非洲犬科动物之间普遍存在和马赛克基因流动的证据,埃塞俄比亚狼,和非洲野狗,尽管它们目前在地理上是分开的。我们的结果支持以下假设:印度次大陆是更新世的避难所和多样化的中心,并进一步突出了以灰狼进化为特征的基因流的复杂历史。
    The gray wolf (Canis lupus) is among the few large carnivores that survived the Late Pleistocene megafaunal extinctions. Thanks to their complex history of admixture and extensive geographic range, the number of gray wolf subspecies and their phylogenetic relationships remain poorly understood. Here, we perform whole-genome sequencing of a gray wolf collected from peninsular India that was phenotypically distinct from gray wolves outside India. Genomic analyses reveal that the Indian gray wolf is an evolutionarily distinct lineage that diverged from other extant gray wolf lineages ∼110 thousand years ago. Demographic analyses suggest that the Indian wolf population declined continuously decline since separating from other gray wolves and, today, has exceptionally low genetic diversity. We also find evidence for pervasive and mosaic gene flow between the Indian wolf and African canids including African wolf, Ethiopian wolf, and African wild dog despite their current geographical separation. Our results support the hypothesis that the Indian subcontinent was a Pleistocene refugium and center of diversification and further highlight the complex history of gene flow that characterized the evolution of gray wolves.
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  • 文章类型: Journal Article
    像表型进化这样的几个过程,疾病易感性和环境适应性,时尚动物的驯化,主要归因于基因组中的结构变异(SV)。这里,我们提供了灰狼(Canis狼疮)和dhole(Cuonalpinus)的高质量草稿基因组,支架N50为6.04Mb和3.96Mb,分别。包含三种犬科动物物种基因组的序列比对揭示了狗特有的SV,特别是16315次插入,2565个删除,443重复,16个倒置和15个易位。与基因相关的狗SVs的功能注释表明它们在能量代谢中的富集,神经系统和免疫系统。有趣的是,我们在群体水平鉴定并验证了完全覆盖AKR1B1(Aldo-Keto还原酶家族1成员B)转录本拷贝的插入。转录组分析揭示了新的AKR1B1拷贝在小肠和肝脏中的高水平表达,与灰狼相比,狗的从头脂肪酸合成和抗氧化能力增加,可能是对农业革命期间饮食变化的反应。第一次,我们报告了对狗驯化过程中SVs进化动力学的综合分析。我们的发现表明,逆行可以产生新的基因来促进驯化,并肯定大规模基因组变异在驯化研究中的重要性。
    Several processes like phenotypic evolution, disease susceptibility and environmental adaptations, which fashion the domestication of animals, are largely attributable to structural variations (SVs) in the genome. Here, we present high-quality draft genomes of the gray wolf (Canis lupus) and dhole (Cuon alpinus) with scaffold N50 of 6.04 Mb and 3.96 Mb, respectively. Sequence alignment comprising genomes of three canid species reveals SVs specific to the dog, particularly 16 315 insertions, 2565 deletions, 443 repeats, 16 inversions and 15 translocations. Functional annotation of the dog SVs associated with genes indicates their enrichments in energy metabolisms, neurological processes and immune systems. Interestingly, we identify and verify at population level an insertion fully covering a copy of the AKR1B1 (Aldo-Keto Reductase Family 1 Member B) transcript. Transcriptome analysis reveals a high level of expression of the new AKR1B1 copy in the small intestine and liver, implying an increase in de novo fatty acid synthesis and antioxidant ability in dog compared to gray wolf, likely in response to dietary shifts during the agricultural revolution. For the first time, we report a comprehensive analysis of the evolutionary dynamics of SVs during the domestication step of dogs. Our findings demonstrate that retroposition can birth new genes to facilitate domestication, and affirm the importance of large-scale genomic variants in domestication studies.
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  • 文章类型: Journal Article
    The evolutionary history of the wolf-like canids of the genus Canis has been heavily debated, especially regarding the number of distinct species and their relationships at the population and species level [1-6]. We assembled a dataset of 48 resequenced genomes spanning all members of the genus Canis except the black-backed and side-striped jackals, encompassing the global diversity of seven extant canid lineages. This includes eight new genomes, including the first resequenced Ethiopian wolf (Canis simensis), one dhole (Cuon alpinus), two East African hunting dogs (Lycaon pictus), two Eurasian golden jackals (Canis aureus), and two Middle Eastern gray wolves (Canis lupus). The relationships between the Ethiopian wolf, African golden wolf, and golden jackal were resolved. We highlight the role of interspecific hybridization in the evolution of this charismatic group. Specifically, we find gene flow between the ancestors of the dhole and African hunting dog and admixture between the gray wolf, coyote (Canis latrans), golden jackal, and African golden wolf. Additionally, we report gene flow from gray and Ethiopian wolves to the African golden wolf, suggesting that the African golden wolf originated through hybridization between these species. Finally, we hypothesize that coyotes and gray wolves carry genetic material derived from a \"ghost\" basal canid lineage.
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  • 文章类型: Journal Article
    The Tibetan Mastiff (TM), a native of the Tibetan Plateau, has quickly adapted to the extreme highland environment. Recently, the impact of positive selection on the TM genome was studied and potential hypoxia-adaptive genes were identified. However, the origin of the adaptive variants remains unknown. In this study, we investigated the signature of genetic introgression in the adaptation of TMs with dog and wolf genomic data from different altitudes in close geographic proximity. On a genome-wide scale, the TM was much more closely related to other dogs than wolves. However, using the \'ABBA/BABA\' test, we identified genomic regions from the TM that possibly introgressed from Tibetan gray wolf. Several of the regions, including the EPAS1 and HBB loci, also showed the dominant signature of selective sweeps in the TM genome. We validated the introgression of the two loci by excluding the possibility of convergent evolution and ancestral polymorphisms and examined the haplotypes of all available canid genomes. The estimated time of introgression based on a non-coding region of the EPAS1 locus mostly overlapped with the Paleolithic era. Our results demonstrated that the introgression of hypoxia adaptive genes in wolves from the highland played an important role for dogs living in hypoxic environments, which indicated that domestic animals could acquire local adaptation quickly by secondary contact with their wild relatives.
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  • 文章类型: Letter
    狗与人类的关系比任何其他驯养动物都要密切得多,可能是由于他们独特的社会认知能力,它们被认为是选择对人类驯服的副产品。这里,我们证明了参与谷氨酸代谢的基因,部分原因是恐惧反应,通过狗和狼的全基因组比较,确实显示出最大的种群分化。然而,它们表达方向的变化支持增加狗的兴奋性突触可塑性,而不是减少恐惧反应。因为突触可塑性被广泛认为是学习和记忆的细胞相关因素,这种变化可能会改变古代觅食狼的学习和记忆能力,削弱对人类的恐惧反应,并提示初始的种间接触。
    Dogs shared a much closer relationship with humans than any other domesticated animals, probably due to their unique social cognitive capabilities, which were hypothesized to be a by-product of selection for tameness toward humans. Here, we demonstrate that genes involved in glutamate metabolism, which account partially for fear response, indeed show the greatest population differentiation by whole-genome comparison of dogs and wolves. However, the changing direction of their expression supports a role in increasing excitatory synaptic plasticity in dogs rather than reducing fear response. Because synaptic plasticity are widely believed to be cellular correlates of learning and memory, this change may alter the learning and memory abilities of ancient scavenging wolves, weaken the fear reaction toward humans, and prompt the initial interspecific contact.
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