Climate Shield Bull Trout (0% Brook Trout), 1980 (Feature Layer)

This feature class represents the historical (1970-1999) scenario for bull trout, derived from the Climate Shield fish distribution models. These models provide stream-specific probabilistic predictions about the occurrence of juvenile bull trout and cutthroat trout in association with three different scenarios for climate change and brook trout invasions. These datasets indicate all potential cold-water habitats less than 11 degrees Celsius. The attribute fields BT_0BRK - BT_100BRK indicate the probabilities of bull trout occurrence within a cold-water habitat based on the prevalence of brook trout at 0%, 25%, 50%, 75%, or 100% of the sites within a habitat. The probabilities were predicted using the Climate Shield native trout models developed from known species occurrence in greater than 500 cold-water streams. The stream centerlines were based on the National Hydrography Dataset (NHD) but were modified for purposes of modeling and cross-walking to other datasets.This record was taken from the USDA Enterprise Data Inventory that feeds into the https://data.gov catalog. Data for this record includes the following resources: ISO-19139 metadata ArcGIS Hub Dataset ArcGIS GeoService CSV Shapefile GeoJSON KML For complete information, please visit https://data.gov.

本特征类表示1970年至1999年间的鳟鱼历史情景，该情景由气候盾牌鱼类分布模型推导而来。这些模型针对特定溪流提供了关于幼年鳟鱼和溪红鳟鱼出现的概率预测，这些预测与气候变化和溪红鳟鱼入侵的三个不同情景相关联。该数据集指出了所有潜在水温低于11摄氏度的冷水栖息地。属性字段BT_0BRK至BT_100BRK表示在冷水栖息地中，基于栖息地内溪红鳟鱼普遍性（0%、25%、50%、75%或100%）的鳟鱼出现的概率。这些概率是通过利用已知物种在超过500条冷水溪流中的出现情况所开发的气候盾牌原生鳟鱼模型进行预测的。溪流中心线基于国家水文数据集（NHD），但经过修改以适应建模和与其他数据集的映射。本记录来源于美国农业部企业数据目录，该目录输入至https://data.gov目录。本记录的数据包括以下资源：ISO-19139元数据、ArcGIS Hub数据集、ArcGIS GeoService、CSV文件、Shapefile、GeoJSON、KML。欲获取完整信息，请访问https://data.gov。