Service Description: Aquatic Fish Irreplaceability, Areas of Conservation Emphasis (ACE), version 3.0.
Aquatic Irreplaceability is a measure of the uniqueness of habitat areas for aquatic species in the landscape, and is one measurement used to describe the distribution of overall species biodiversity in California for the California Department of Fish and Wildlife’s (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 rare species richness.
Here, aquatic irreplaceability represents the relative importance of each watershed based on the uniqueness of habitat areas present for rare and endemic aquatic species. Watersheds with high irreplaceability contain species or habitat conditions that occur in few places in the landscape. These areas may be of high conservation value due to their unique contribution to biodiversity. The data provides, 1) the irreplaceability weight, based on the rarity-weighted index (RWI), which weights the species count by the extent of the distribution for each species, so watersheds providing habitat for narrowly distributed species are given a higher score, and 2) a count of the total number of endemic species per taxonomic group in each watershed based on documented species occurrence information for aquatic reptiles and amphibians. Areas with a high RWI support rare species with few documented occurrences; these areas would be expected to support unique habitats or suites of species that are limited in distribution. The data can be used to identify areas of high irreplaceability. Users can view a list of species that contribute to the biodiversity summary for each watershed.
The aquatic irreplaceability summary depicts the areas of highest irreplaceability across the state. To achieve this, the data was normalized by taxonomic group (see Data Sources and Models Used, below). The aquatic irreplaceability by taxonomic group layers give a statewide overview of irreplaceability for each individual taxonomic group, showing irreplaceability weights (RWI values) for aquatic amphibians, fish, and aquatic reptiles, and counts of rare endemic aquatic amphibians and reptiles per watershed.
Service ItemId: 585be735bb854035a6605de6a8d2e249
Has Versioned Data: false
Max Record Count: 2000
Supported query Formats: JSON
Supports applyEdits with GlobalIds: False
Supports Shared Templates: False
All Layers and Tables
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Description: For more information, see the Aquatic Rarity-weighted Richness Factsheet at https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=150854.
The California Department of Fish and Wildlife’s (CDFW) Areas of Conservation Emphasis (ACE) is a compilation and analysis of the best-available statewide spatial information in California on biodiversity, rarity and endemism, harvested species, significant habitats, connectivity and wildlife movement, climate vulnerability, climate refugia, and other relevant data (e.g., other conservation priorities such as those identified in the State Wildlife Action Plan (SWAP), stressors, land ownership). ACE addresses both terrestrial and aquatic data. The ACE model combines and analyzes terrestrial information in a 2.5 square mile hexagon grid and aquatic information at the HUC12 watershed level across the state to produce a series of maps for use in non-regulatory evaluation of conservation priorities in California. The model addresses as many of CDFWs statewide conservation and recreational mandates as feasible using high quality data sources. High value areas statewide and in each USDA Ecoregion were identified. The ACE maps and data can be viewed in the ACE online map viewer, or downloaded for use in ArcGIS. For more detailed information see https://www.wildlife.ca.gov/Data/Analysis/ACE and https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=24326.
ACE Areas of Conservation Emphasis; Program Lead; California Department of Fish and Wildlife (CDFW); Biogeographic Data Branch; ; ; ; ACE@wildlife.ca.gov;
Spatial Reference: 102100 (3857)
Initial Extent:
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Spatial Reference: 102100 (3857)
Full Extent:
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Spatial Reference: 102100 (3857)
Units: esriMeters
Child Resources:
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Supported Operations:
Query
ConvertFormat
Get Estimates