The salt marsh common yellowthroat, Geothlypis trichas sinuosa, is a subspecies of the common yellowthroat, a New World warbler.[2] It was first described by Joseph Grinnell in 1901, who distinguished it from neighboring western subspecies by darker dorsal coloration and slightly smaller size.[3] Because of its discovery in San Francisco Bay, the subspecies is often referred to as the San Francisco common yellowthroat.[4]
The salt marsh common yellowthroat has experienced a dramatic 80% decline from the early 20th century through 1976 due to significant loss of its preferred habitat, marshes and other areas of dense vegetation near water.[2][5] Additional pressures include degradation of riparian thickets in urban settings and brood parasitism by the brown-headed cowbird.[4]
Conservation
Recognized by the California Department of Fish and Wildlife as a Bird Species of Special Concern, the subspecies is considered in local planning and restoration projects.[4] For example, it is a species of concern for protection in efforts to restore Chelsea Wetlands in Hercules, California.[6]
1 2 3 4 Gardali, T.; Evens, J. (2008). "San Francisco Common Yellowthroat (Geothlypis trichas sinuosa)". Shuford, W. D.; Gardali, T. (eds.), California Bird Species of Special Concern. Camarillo, CA and Sacramento, CA: Western Field Ornithologists, and California Department of Fish and Game. pp.317–321. Retrieved 16 October 2025.
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