Layers:

Layer: California Least Tern Monitoring Sites by Region _ CDFW _ ds3147 (0)


Name: California Least Tern Monitoring Sites by Region _ CDFW _ ds3147

Display Field: Region

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: California least tern colonies are monitored during nesting season along the California Coast and data is reported to California Department of Fish and Wildlife. The colonies in this dataset range from the Tijuana river mouth near the Mexico border to Sacramento. Locations and data include both present and historic sites. Locations are approximate and can have variation over time. These approximate locations were overlaid with a statewide hexagon layer (ds675) and then a buffer was created in order to mask exact nesting locations. These were then combined and broken into 4 main regions: S.F. Bay, Central, Ventura, and Southern. Two additional polygons are separated for the inland sites Kings and Sacramento. Some additional sites without location information can be found in the related table. The related table includes nesting totals by year from 1990 - 2023. It's anticipated to update this dataset to include earlier and newer records. Monitoring data includes estimated fledglings, estimated breeding pairs, total number of nests, and predator information when included in site reports. Annual reports 2017 and earlier can also be found by searching in California Department of Fish and Wildlife's document library (nrm.dfg.ca.gov/documents/docViewer.aspx). A version of this data, monitoring sites generalized to a 2.5 square mile hexagon, has been made available in BIOS as California Least Tern Monitoring Sites Generalized - CDFW [ds3146].

Copyright Text: U.S. Fish and Wildlife Service, Department of Defense, California Department of Parks and Recreation, California Department of Fish and Wildlife, Orange County Water District, Point Blue Conservation Science, San Francisco Bay Bird Observatory, East Bay Regional Park District, Santa Ana Watershed Association, San Diego Zoo Wildlife Alliance, Ryan Ecological Consulting, San Diego Audubon Society, Los Angeles Audubon Society, and Ventura Audubon Society. For records 2017 and earlier, see annual report (go to https://nrm.dfg.ca.gov/documents/DocViewer.aspx and search for least tern) or contact Hans Sin (Hans.Sin@wildlife.ca.gov), Kyle Rice (Kyle.Rice@wildlife.ca.gov), or Laura Van Vranken (Laura.VanVranken@wildlife.ca.gov).

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Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

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Extent:

XMin: -13621203.8109429
YMin: 3833353.134
XMax: -12874109.8418016
YMax: 4645735.39327927
Spatial Reference: 102100 (3857)


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Relationships:
• forward (0) -- Related To: California Least Tern Monitoring Sites by Region - CDFW [ds3147] Extended Table (1)
Is Data Versioned: false

Has Contingent Values: false

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Last Edit Date: 5/20/2025 6:34:11 PM

Schema Last Edit Date: 5/20/2025 6:34:11 PM

Data Last Edit Date: 5/20/2025 6:34:11 PM

Tables:

California Least Tern Monitoring Sites by Region - CDFW [ds3147] Extended Table (1)


Name: California Least Tern Monitoring Sites by Region - CDFW [ds3147] Extended Table

Display Field: SITE_REPORT_NAME

Type: Table

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Name: California Least Tern Monitoring Sites by Region - CDFW [ds3147] Extended Table
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Relationships:
• backward (0) -- Related To: California Least Tern Monitoring Sites by Region _ CDFW _ ds3147 (0)
Is Data Versioned: false

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Last Edit Date: 5/20/2025 6:34:11 PM

Schema Last Edit Date: 5/20/2025 6:34:11 PM

Data Last Edit Date: 5/20/2025 6:34:11 PM