The Bolivian river dolphin, known locally as the bufeo, is one of 4 species of river dolphin in South America. Endemic to the upper basin of the Madeira in the Bolivian Amazon region, the species is categorized as Endangered on the IUCN Red List. This article provides information related to the geographic distribution of the species, and a review of the studies of its abundance that have been conducted in Bolivia since the 1970s. We discuss the surveys, the analysis methods used in the different studies, and the ways in which these methods might influence the population estimates. We found 63 population abundance estimates for the Bolivian river dolphin across 17 reviewed publications. These studies report relative abundance data for rivers that range from 0.2 to 2.81 bufeos km−1, and density ranges from 0 to 7.59 bufeos km−2. The information presented here reflects the knowledge of the population size of the species in Bolivia obtained over 4 de cades, and will be useful for developing conservation strategies and as a tool for decision makers.

中文翻译：

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玻利维亚玻利维亚河豚 Inia geoffrensis boliviensis 分布及丰度研究 40 年回顾

玻利维亚河豚，当地称为bufeo，是南美洲4种河豚之一。该物种是玻利维亚亚马逊地区马德拉河上游盆地的特有物种，在世界自然保护联盟红色名录中被列为濒危物种。本文提供了与该物种的地理分布相关的信息，并回顾了自 1970 年代以来在玻利维亚进行的对其丰度的研究。我们讨论了调查、不同研究中使用的分析方法，以及这些方法可能影响人口估计的方式。我们在 17 份经过审查的出版物中发现了 63 种玻利维亚河豚种群丰度估计值。这些研究报告了河流的相对丰度数据，范围为 0.2 至 2.81 bufeos km-1，密度范围为 0 至 7.59 bufeos km-2。