Common and rare species differ in their level of dispersal ability and habitat specialization, and thus should respond to distinct assembly rules. Rare species are much more spatially restricted and usually show higher habitat specialization, so they can be much more vulnerable to landscape changes than common species. We simulated three species-loss scenarios to assess how different groups of stream fish species respond to environmental and spatial variables and how potential extinctions affected regional functional richness and the average functional distinctiveness. Rare and common species contribute similarly to the global functional richness, but the loss of common species led to a marked decrease in local redundancy. Whilst intermediate and rare species are regulated by dispersal, dominant species respond to niche processes and are more affected by land-use changes. Therefore, common and rare species are under distinct assembly rules and may exhibit distinct responses in the face of environmental anthropization. Addressing rare species is often overlooked, despite constant claims regarding their importance and their frequently concerning conservation status. Accounting for their rarity can offer a more refined look at the responses of species to human modifications, providing valuable information on how to tackle biodiversity loss.

中文翻译：

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改造后的景观如何过滤稀有物种并调节区域生态特征库？

常见和稀有物种的扩散能力和栖息地专业化水平不同，因此应响应不同的组装规则。稀有物种在空间上受到更多限制，通常表现出更高的栖息地专业化，因此它们比普通物种更容易受到景观变化的影响。我们模拟了三种物种丧失情景，以评估不同种类的溪流鱼类对环境和空间变量的反应，以及潜在的灭绝如何影响区域功能丰富度和平均功能独特性。稀有和常见物种对全球功能丰富度的贡献类似，但常见物种的丧失导致局部冗余显着减少。虽然中间物种和稀有物种受分散调控，优势物种对生态位过程做出反应，更受土地利用变化的影响。因此，常见和稀有物种在不同的组装规则下，可能在面对环境人类化时表现出不同的反应。尽管经常声称稀有物种的重要性和保护状况经常受到关注，但解决稀有物种的问题却经常被忽视。考虑到它们的稀有性，可以更精细地观察物种对人类改造的反应，提供有关如何解决生物多样性丧失的宝贵信息。尽管不断声称它们的重要性和它们经常涉及的保护状况。考虑到它们的稀有性，可以更精细地观察物种对人类改造的反应，提供有关如何解决生物多样性丧失的宝贵信息。尽管不断声称它们的重要性和它们经常涉及的保护状况。考虑到它们的稀有性，可以更精细地观察物种对人类改造的反应，提供有关如何解决生物多样性丧失的宝贵信息。