Tiger hair morphology and its variations for wildlife forensic investigation

IF 0.7 4区 综合性期刊 Q3 MULTIDISCIPLINARY SCIENCES
Thitika Kitpipit, Phuvadol Thanakiatkrai
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引用次数: 3

Abstract

Tiger population has dramatically decreased due to illegal consumption and commercialisation of their body parts. Frequently, hair samples are the only evidence found in the crime scene. Thus, they play an important role in species identification for wildlife forensic investigation. In this study, we provide the first in-depth report on a variety of qualitative and quantitative characteristics of tiger guard hairs (24 hairs per individual from four individuals). The proposed method could reduce subjectivity of expert opinions on species identification based on hair morphology. Variations in 23 hair morphological characteristics were quantified at three levels: hair section, body region, and intra-species. The results indicate statistically significant variations in most morphological characteristics in all levels. Intra-species variations of four variables, namely hair length, hair index, scale separation and scale pattern, were low. Therefore, identification of tiger hairs using these multiple features in combination with other characteristics with high inter-species variations (e.g. medulla type) should bring about objective and accurate tiger hair identification. The method used should serve as a guideline and be further applied to other species to establish a wildlife hair morphology database. Statistical models could then be constructed to distinguish species and provide evidential values in terms of likelihood ratios.
虎毛形态及其变异在野生动物法医调查中的应用
由于非法消费和老虎身体部位的商业化,老虎的数量急剧减少。通常,头发样本是在犯罪现场发现的唯一证据。因此,它们在野生动物法医调查的物种鉴定中发挥着重要作用。在这项研究中,我们首次深入报道了老虎护毛的各种定性和定量特征(来自4个个体的24根毛发)。该方法可以减少专家意见在基于毛发形态的物种鉴定中的主观性。对23种毛发形态特征的变异进行了定量分析,分为毛发剖面、体区和种内3个层次。结果表明,在所有水平上,大多数形态特征的差异具有统计学意义。毛发长度、毛发指数、鳞片间距和鳞片格局4个变量的种内变异均较低。因此,利用这些多重特征结合其他物种间差异较大的特征(如髓质类型)进行虎毛鉴定,应能实现客观、准确的虎毛鉴定。该方法可作为参考,并进一步应用于其他物种,建立野生动物毛发形态学数据库。然后可以构建统计模型来区分物种,并根据似然比提供证据值。
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来源期刊
CiteScore
1.10
自引率
0.00%
发文量
0
审稿时长
15 months
期刊介绍: We accept contributions (full paper, review, report, communication, short communication, and technical note) in the fields of physical sciences, earth sciences, life sciences, agricultural sciences, and related technology including engineering but excluding logistics, ergonomics, computer science and engineering, sports science, pollution research, waste treatment, excavation technology, metallurgy, concrete technology, steel technology, fossil fuel technology, fluid mechanics, electrical engineering, engineering management, agricultural management, data mining, mobile telephone technology, wind power technology, wireless sensor networks, telecommunication, traffic monitoring and technology, etc.
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