Arguello Slender Salamander Range - CWHR A080 [ds3294]

CWHR species range datasets represent the maximum current geographic extent of each species within California. Ranges were originally delineated at a scale of 1:5,000,000 by species-level experts more than 30 years ago and have gradually been revised at a scale of 1:1,000,000. Species occurrence data are used in defining species ranges, but range polygons may extend beyond the limits of extant occurrence data for a particular species. When drawing range boundaries, CDFW seeks to err on the side of commission rather than omission. This means that CDFW may include areas within a range based on expert knowledge or other available information, despite an absence of confirmed occurrences, which may be due to a lack of survey effort. The degree to which a range polygon is extended beyond occurrence data will vary among species, depending upon each species’ vagility, dispersal patterns, and other ecological and life history factors. The boundary line of a range polygon is drawn with consideration of these factors and is aligned with standardized boundaries including watersheds (NHD), ecoregions (USDA), or other ecologically meaningful delineations such as elevation contour lines. While CWHR ranges are meant to represent the current range, once an area has been designated as part of a species’ range in CWHR, it will remain part of the range even if there have been no documented occurrences within recent decades. An area is not removed from the range polygon unless experts indicate that it has not been occupied for a number of years after repeated surveys or is deemed no longer suitable and unlikely to be recolonized. It is important to note that range polygons typically contain areas in which a species is not expected to be found due to the patchy configuration of suitable habitat within a species’ range. In this regard, range polygons are coarse generalizations of where a species may be found. This data is available for download from the CDFW website: https://www.wildlife.ca.gov/Data/CWHR. This range was originally create for publication by Sweet and Jockusch (2021): https://asih.kglmeridian.com/view/journals/cope/109/3/article-p836.xml加州野生动物-栖息地关联（California Wildlife-Habitat Relationships, CWHR）物种分布数据集呈现了加利福尼亚州内各物种当前的最大地理分布范围。该数据集的分布范围最初于30余年前由物种专家以1:500万比例尺绘制定界，后逐步以1:100万比例尺进行修订。物种分布范围的划定以物种出现记录为依据，但分布范围多边形可能会超出某一物种现存出现记录的边界。加州鱼类与野生动物部（California Department of Fish and Wildlife, CDFW）在绘制分布范围边界时，倾向于宁可多划而非漏划，这意味着即便缺乏经确认的出现记录（此类情况可能源于调查工作不足），CDFW仍可基于专家知识或其他可用信息，将相关区域纳入物种分布范围。分布范围多边形超出出现记录边界的程度因物种而异，取决于各物种的扩散能力、扩散模式以及其他生态与生活史特征。分布范围多边形的边界线绘制会综合考量上述因素，并与标准化边界对齐，这些标准化边界包括水文流域（国家水文数据集，National Hydrography Dataset, NHD）、生态区（美国农业部，United States Department of Agriculture, USDA）以及其他具有生态意义的划界方式，例如海拔等高线。尽管CWHR分布范围旨在反映物种当前的分布区，但一旦某区域被纳入CWHR的物种分布范围，即便近数十年内未出现过相关记录，该区域仍会保留在分布范围之中。除非专家经多次调查后确认某区域已连续多年未被该物种占据，或认定该区域不再适宜物种生存且不太可能再次被定居，否则不会将该区域从分布范围多边形中移除。需要注意的是，由于物种分布范围内适宜栖息地呈斑块状分布，分布范围多边形通常会包含一些理论上不会有该物种出现的区域。就此而言，分布范围多边形仅是对物种潜在分布区域的粗略概括。该数据集可从CDFW官网下载：https://www.wildlife.ca.gov/Data/CWHR。本分布数据集最初由Sweet与Jockusch（2021）为发表文章而编制：https://asih.kglmeridian.com/view/journals/cope/109/3/article-p836.xml