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首页> 外文期刊>Conservation Biology >Quantifying rarity, losses, and risks for native fishes of the lower Colorado River Basin: Implications for conservation listing
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Quantifying rarity, losses, and risks for native fishes of the lower Colorado River Basin: Implications for conservation listing

机译：量化科罗拉多河下游流域的稀有鱼类，损失和风险：对保护清单的影响

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摘要

We examined spatial distributions of fishes native to the lower basin of the Colorado River (25 species) at three scales to determine percent decline from historical distributions based on a regional biodiversity database. We cumulated records from 1843 to 1980 to develop a "historical distribution" for each species and used those occurrences recorded from 1981 to 1998 as "modern" records. We then contrasted historical and modern distributions to (1) quantify losses in spatial distribution; (2) determine how strongly these losses and fragmentation patterns corresponded to the perceived risk of extinction of each species, as represented by its status under the IUCN Red List of Endangered Species; and (3) update extinction risk rankings for 15 fishes endemic to the lower Colorado Basin according to the IUCN criteria. Based on presence and absence data, fish fauna of the lower Colorado Basin have suffered massive distributional losses. On average, ranges of extant species have diminished more than 45% relative to their historical distribution, and 35% of species have lost 50% or more of their occurrences. We provide nine new IUCN rankings and six updates to reflect more accurately the heightened imperilment of these species. Based on our new rankings, 7 of the 15 lower Colorado Basin endemics are critically endangered, 1 is endangered, 2 are vulnerable, and 1 is already extinct. We categorize the remaining 2 endemics as lower risk. This work demonstrates the utility of matching quantitative spatial metrics such as the scale-area slope statistic to extinction risk criteria for species whose persistence is strongly influenced by spatial distribution.
机译：我们以三个尺度检查了科罗拉多河下游流域（25种）原生鱼类的空间分布，以基于区域生物多样性数据库确定历史分布的下降百分比。我们对1843年至1980年的记录进行了累积，以建立每种物种的“历史分布”，并将1981年至1998年记录的这些事件用作“现代”记录。然后，我们将历史和现代分布进行对比，以（1）量化空间分布的损失; （2）确定这些损失和破碎方式与每种物种的已知灭绝风险有多大对应关系，以其在《世界自然保护联盟濒危物种红色名录》中的地位表示; （3）根据IUCN标准更新科罗拉多州下游盆地15种特有鱼类的灭绝风险等级。根据有无数据，科罗拉多州下游盆地的鱼类区系遭受了巨大的分布损失。平均而言，现存物种的范围相对于其历史分布减少了45％以上，而35％的物种损失了50％或更多的发生。我们提供了九个新的IUCN排名和六个更新，以更准确地反映这些物种的高度威胁。根据我们的新排名，科罗拉多盆地15个地方特有物种中有7个濒临灭绝，1个濒临灭绝，2个处于脆弱状态，1个已经灭绝。我们将其余2种地方病归为较低风险。这项工作证明了将持久性受空间分布强烈影响的物种的定量空间度量（例如比例区域坡度统计）与灭绝风险标准相匹配的实用性。

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