Rarity Patterns for Bird Species of Southern Africa (1 km)

Name: Rarity Patterns for Bird Species of Southern Africa (1 km)
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Esri Aid & Development Team2026-03-28 收录

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<div style='text-align:Left; font-size:12pt;'>Overview This layer shows species rarity patterns for bird species of southern Africa based on data availability. Species rarity is the average range-restrictedness of all species expected to occur in each grid cell. Here rarity is expressed as a raw value from low (purple) to high (yellow). NOTE: raw rarity values are very small (<1).Species ranges were modeled at a 1-km resolution, integrating occurrence data and expert maps, where each distribution was predicted across Africa, and limited to the southern Africa extent. This extent represents the area for which there was complete spatial and taxonomic data coverage for this species group. Biodiversity is critical for maintaining the function of ecosystems and their services to humans. Using different biodiversity measures can shed light on which areas should be prioritized for biodiversity conservation. Beyond the number of species occurring in an area, rare species that have small range extents should be prioritized in conservation planning, as the conservation opportunities are limited for these range-restricted species especially when comparing them to wide-ranging species. Patterns of species richness and range rarity provide insights about the biogeography of taxa and offer an initial basis for global biodiversity conservation efforts. Data source used to predict species rangesOccurrences: GBIF (2017). Global Biodiversity Information Facility Data Portal. Accessed on 5th July 2017. Expert maps: IUCN (2017). International Union for Conservation of Nature - Red List of Threatened Species. Accessed on January 2017.</div>

概述 本图层展示了基于数据可得性的南部非洲鸟类物种稀有性分布格局。物种稀有性指的是每个网格单元格中预计出现的所有物种的平均分布受限程度。此处稀有性以原始值表示，范围从低值（紫色）到高值（黄色）。注意：原始稀有性数值极小（小于1）。物种分布范围以1公里分辨率建模，整合了物种出现记录数据与专家手绘分布图，其中每个物种的分布范围在全非洲范围内进行预测，并最终限定在南部非洲研究区域内。该研究区域为本物种类群提供了完整的空间与分类学数据覆盖范围。生物多样性对于维持生态系统功能及其为人类提供的生态系统服务至关重要。采用不同的生物多样性度量指标，能够为划定生物多样性保护优先区域提供科学参考。除了关注区域内的物种丰富度之外，分布范围狭小的稀有物种也应在保护规划中得到优先考量——相较于广布物种，这类分布受限物种的保护机会更为有限。物种丰富度与分布稀有性格局能够揭示类群的生物地理学特征，并为全球生物多样性保护工作提供初步依据。 用于预测物种分布范围的数据来源 1. 物种出现记录数据：全球生物多样性信息设施（Global Biodiversity Information Facility，GBIF）（2017），全球生物多样性信息设施数据门户，2017年7月5日获取。 2. 专家手绘分布图：国际自然保护联盟（International Union for Conservation of Nature，IUCN）（2017），《国际自然保护联盟濒危物种红色名录》，2017年1月获取。

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