Abstract：
DNA barcoding and environmental DNA (eDNA) represent significant advances for biomonitoring the world\'s biodiversity and its threats. However, these methods are highly dependent on the presence of species sequences on molecular databases. Brazil is one of the world\'s largest and most biologically diverse countries. However, many knowledge gaps still exist for describing, identifying, and monitoring of mammalian biodiversity using molecular methods. We aimed to unravel the patterns of the presence of Brazilian mammal species on molecular databases to improve our understanding of how effectively it would be to monitor them using DNA barcoding and environmental DNA, and contribute to mammalian conservation. We foundt many gaps in molecular databases, with many taxa being poorly represented, particularly from Amazonia, the order Lagomorpha, and arboreal, gomivorous, near extinct, and illegally traded species. Moreover, our analyses revealed that species description year was the most important factor determining the probability of a species to being sequenced. Primates are the group with the highest number of species considered a priority for sequencing due to their high level of combined threats. We highlight where investments are needed to fill knowledge gaps and increase the representativity of species on molecular databases to enable a better monitoring ability of Brazilian mammals encompassing different traits using DNA barcoding and environmental DNA.
摘要：
DNA条形码和环境DNA（eDNA）代表了生物监测世界生物多样性及其威胁的重大进展。然而,这些方法高度依赖于分子数据库中物种序列的存在。巴西是世界上最大和最具生物多样性的国家之一。然而,仍然存在许多知识空白，识别,和使用分子方法监测哺乳动物生物多样性。我们的目标是解开巴西哺乳动物物种在分子数据库中的存在模式，以提高我们对使用DNA条形码和环境DNA监测它们的有效性的理解，并有助于哺乳动物的保护。我们在分子数据库中发现了许多空白,许多分类群的代表性很差，特别是来自亚马逊，Lagomorpha秩序，和树栖动物，gomivorous,濒临灭绝,和非法交易的物种。此外，我们的分析表明，物种描述年份是决定物种被测序概率的最重要因素。灵长类动物是具有最高数量的物种的群体,由于其高水平的组合威胁而被认为是测序的优先事项。我们强调需要进行投资以填补知识空白并增加分子数据库中物种的代表性，从而使用DNA条形码和环境DNA更好地监测包含不同特征的巴西哺乳动物。
