Cover Illustrations: The freshwater gastropod Bellamya (Viviparidae) plays an important role in nutrient recycling in various benthic ecosystems throughout Africa, but populations of the Bellamya species endemic to the Lake Victoria ecoregion have undergone strong demographic declines and are collapsing.

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封面插图：淡水腹足纲动物贝拉米亚（Viviparidae）在整个非洲底栖生态系统中的养分循环中起着重要作用，但是维多利亚湖生态区特有的贝拉米亚物种的人口经历了严重的人口下降，并且正在崩溃。