San Diego Management & Monitoring Program


Vertebrate Species
Tricolored Blackbird (Agelaius tricolor) Surveys

in progress

Project description

Tricolored blackbird is a state-listed endangered species that has declined dramatically in southern California. Once abundant and widespread in San Diego County, there are few known breeding populations remaining at marshes on Conserved Lands. AECOM biologists surveyed for tricolored blackbirds in spring 2021 at historic and recently documented breeding habitats and at potentially suitable habitats. Surveys were to determine if tricolored blackbirds are present during the breeding season and to estimate population size and breeding status. AECOM biologists used a protocol developed by SDMMP to evaluate habitat quality and threats at each suitable habitat site, even those without tricolored blackbirds. These data , and data from subsequent yearly surveys, will be provided to SDMMP to develop management recommendations for tricolored blackbird. Tricolored blackbirds will be surveyed for annually.


Project protocol

Name: San Diego County 2021 Tricolored Blackbird Surveys: Breeding Surveys & Habitat and Threat Assessment

Description: This survey protocol outlines the methods for conducting TRBL surveys across San Diego County in April and May 2021. A team of two surveyors will collect data using two different software packages-Ful


Project Data - Files


Project focus

Project type: Monitoring

Target species: Tricolored blackbird

Data steward: Emily Perkins

Main implementing entity: San Diego Management and Monitoring Program

Partner: AECOM

Point of contact: Kris Preston

Project Page manager: Sarah McCutcheon

SDMMP lead: Kris Preston

Study lead: Andrew Fisher; Loren Merrill


Project Funding

San Diego Association of Governments

Strategic elements

MSP Objectives and actions:AGETRI-3


Files and Documents