Eulachon

<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Oregon Fish Habitat Oregon Fish Habitat Distribution. These data describe areas of suitable habitat believed to be used currently or historically by native or non-native fish populations. The term "currently" is defined as within the past five reproductive cycles. Historical habitat includes suitable habitat that fish no longer access and will not access in the foreseeable future without human intervention. This information is based on sampling, the best professional opinion of Oregon Dept. of Fish and Wildlife or other natural resources agency staff biologists or modeling (see the fhdBasis field). Due to natural variations in run size, water conditions, or other environmental factors, some habitats identified may not be used annually. These data now comply with the Oregon Fish Habitat Distribution Data Standard that was adopted by the Oregon Geographic Information Council in April 2020. The Standard document can be found at: https://www.oregon.gov/geo/standards/OregonFishHabitatDistributionDataStandard_v4.pdf. Historical habitat distribution data are within the scope of the standard and are identified via the habitat use (fhdUseType) attribute. Historical habitats are only identified outside of currently accessible habitat and are not comprehensive. Data representing current habitat for anadromous and resident salmonid species are generally more comprehensive than data for non-game and non-native fish species. All datasets are subject to update as new information becomes available. Key features of the Oregon Fish Habitat Distribution Data include: species, run, life history, habitat use, origin, production, the basis for each record, originator name, originator entity and reference. Habitat distribution data are mapped at a 1:24,000 scale statewide and are based on the National Hydrography dataset. The data are made available as GIS files in both shapefile and ESRI geodatabase format. The data were developed over an extensive time period ranging from 1996 to 2024. The data are now managed on the National Hydrography Dataset and have been synchronized to December 2021 NHD geometry.Distribution for seventeen native migratory species / runs, including numerous resident species. Not all habitat distribution datasets are comprehensive.</SPAN></P></DIV></DIV></DIV>

俄勒冈鱼类栖息地分布数据集（Oregon Fish Habitat Distribution）。本数据集描述了当前或历史上被本土或外来鱼类种群利用的适宜栖息地范围。其中“当前”定义为过去五个繁殖周期内。历史栖息地指鱼类目前已无法进入，且在无人类干预的可预见未来也无法进入的适宜栖息地。本信息基于采样调查、俄勒冈州鱼类与野生动物局（Oregon Dept. of Fish and Wildlife）或其他自然资源机构的专业生物学家的行业权威判断，或相关建模分析（详见fhdBasis字段）。由于洄游种群规模、水文条件或其他环境因素的自然波动，部分已识别的栖息地可能并非每年都会被鱼类利用。本数据集现已符合俄勒冈地理信息委员会（Oregon Geographic Information Council）于2020年4月通过的《俄勒冈鱼类栖息地分布数据标准》。该标准文档可通过以下链接获取：https://www.oregon.gov/geo/standards/OregonFishHabitatDistributionDataStandard_v4.pdf。历史栖息地分布数据属于本标准的覆盖范围，可通过栖息地利用（fhdUseType）属性进行识别。历史栖息地仅划定于当前可接入栖息地范围之外，并非全域覆盖。针对溯河洄游性与定居性鲑科鱼类的当前栖息地数据，整体完备性通常高于非猎用及外来鱼类物种的相关数据。所有数据集均会随新信息的获取而更新。俄勒冈鱼类栖息地分布数据的核心属性包括：物种、洄游类群、生活史类型、栖息地利用类型、起源、繁育类型、每条记录的依据、创建者姓名、创建机构及参考文献。本栖息地分布数据以1:24000比例尺在全州范围内绘制，其基础为国家水文数据集（National Hydrography Dataset）。数据以形状文件（shapefile）和ESRI地理数据库（ESRI geodatabase）两种GIS文件格式提供。本数据集的开发周期跨度为1996年至2024年。目前数据托管于国家水文数据集，并已同步至2021年12月版的NHD几何数据。本数据集覆盖17种本土洄游物种/类群，以及众多定居性物种。并非所有栖息地分布数据集均实现全面覆盖。