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Current status and distribution of the Vulnerable common hippopotamus Hippopotamus amphibius in Mozambique

机译：莫桑比克易受害普通河马河马两栖动物的现状和分布

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Populations of the common hippopotamus Hippopotamus amphibius in Mozambique were surveyed in 2010 during a national survey of the crocodile Crocodylus niloticus. Numbers of hippos seen during aerial counts along major rivers and lake shores were corrected to allow for undercounting of groups and these data were supplemented with the results of other recent surveys. There are now estimated to be c. 3,000 hippos in Mozambique and c. 50% of these live in Lake Cabora Bassa or the Zambezi River. The national total is much lower than the figure of 16,000-20,500 hippos estimated in 1986, used for the latest (v. 2012.1) IUCN Red List. The 1986 total included an estimated 10,000-12,000 in Marromeu Complex, an area that includes the southern Zambezi delta. We review the results of past surveys and find that the number of hippos in Marromeu Complex in 1986 was probably three times fewer than estimated. Although the number of hippos in this area declined markedly during the 1980s we believe that the 1986 overestimate of hippos in Marromeu Complex is an error that has been perpetuated for 25 years. Particular care should be taken when Red List assessments roll-over old and unsupported estimates of numbers. Even if an old estimate was accurate there comes a time when it should not simply be rolled-over. The 2007 IUCN Species Survival Commission's African Elephant Status Report provides a model for future assessments of the status of the common hippopotamus, categorizing the numbers of a species according to the type of survey, its reliability, and how long ago it was conducted.
机译：莫桑比克2010年对鳄鱼鳄尼罗河进行了一次全国调查，对莫桑比克常见的河马两栖河马种群进行了调查。对沿主要河流和湖岸的空中计数中发现的河马数量进行了校正，以允许对群体进行低估，并且将这些数据与其他近期调查的结果进行了补充。现在估计是c。莫桑比克和c的3,000河马其中有50％生活在卡波拉巴萨湖或赞比西河中。全国总数远远低于1986年估计的16,000-20,500匹河马的数字，该数字被用于最新（第2012.1版）《自然保护联盟红色名录》。 1986年的总数包括Marromeu Complex的估计10,000-12,000，该地区包括南部的赞比西河三角洲。我们回顾了以前的调查结果，发现1986年Marromeu Complex中的河马数量可能比估计的数量少三倍。尽管该地区的河马数量在1980年代显着下降，但我们认为1986年Marromeu Complex中河马的高估是一个错误，这种错误已经持续了25年。当“红色清单”评估将旧的和不受支持的数字估算值进行滚动计算时，应格外小心。即使以前的估算是准确的，也有一段时间不应该将其简单地累计。 2007年世界自然保护联盟物种生存委员会的《非洲象状态报告》提供了一个模型，用于将来评估普通河马的状况，根据调查的类型，其可靠性以及进行时间长短对种类进行分类。

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