Aquatic Rare Fish Richness - ACE [ds2749]

Aquatic Rare Fish Richness, Areas of Conservation Emphasis (ACE), version 3.0.

Aquatic rare species richness is a measure of species biodiversity, and is one measurement used to describe the distribution of overall species biodiversity in California for the California Department of Fish and Wildlife (CDFW) Areas of Conservation Emphasis Project (ACE). Other measures of aquatic species biodiversity included in the ACE aquatic biodiversity summary are aquatic native species richness and aquatic irreplaceability. Here, rare species richness represents a count of the total number of rare aquatic species potentially present in each watershed based on documented species occurrence information. This dataset depicts the distribution of richness of all aquatic species in the state, both common and rare. The data can be used to view patterns of species rarity, and to identify areas of highest rarity richness across the state. Users can view a list of species that contribute to the richness counts for each watershed.

The aquatic rare species richness summary depicts relative diversity within watersheds across the state. To correct for differences in the number of taxa per taxonomic group, the data was normalized by taxonomic group (see Data Sources and Models Used, below). The aquatic native species richness by taxonomic group layers give a statewide overview of richness for each individual taxonomic group, showing counts of species per watershed for aquatic amphibians, fish, and aquatic reptiles.

水生稀有鱼类丰富度：保护重点区域（Areas of Conservation Emphasis，ACE）数据集 版本3.0

水生稀有物种丰富度是物种生物多样性的量化指标之一，由加州鱼类与野生动物局（California Department of Fish and Wildlife，CDFW）的保护重点区域（Areas of Conservation Emphasis，ACE）项目研发，用于刻画加州全域整体物种生物多样性的空间分布特征。该ACE水生生物多样性汇总数据集还包含其他水生生物多样性衡量指标，如水生本土物种丰富度与水生不可替代性指数。本数据集中的稀有物种丰富度，指基于已记录的物种出现信息，统计各流域内潜在分布的稀有水生物种总数量。

本数据集刻画了加州全境所有水生（涵盖常见与稀有物种）的物种丰富度空间分布格局。该数据可用于展示物种稀有性分布模式，并识别全州范围内稀有物种丰富度最高的区域；用户还可查看各流域内构成丰富度统计的物种名录。

水生稀有物种丰富度汇总数据集刻画了全州各流域内的相对生物多样性水平。为校正不同分类群的类群数量差异，本数据按分类群进行了标准化处理（详见下文「数据来源与所用模型」章节）。按分类群划分的水生本土物种丰富度图层，可呈现全州各单一分类群的物种丰富度概况，具体展示了水生两栖类、鱼类及水生爬行类在各流域内的物种数量统计结果。