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SAN FRANCISCO COMMON YELLOWTHROAT (Geothlypis Trichas Sinuosa) Thomas Gardali and Jules Evens

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SAN FRANCISCO COMMON YELLOWTHROAT (Geothlypis Trichas Sinuosa) Thomas Gardali and Jules Evens II SPECIES ACCOUNTS Andy Birch PDF of San Francisco Common Yellowthroat account from: Shuford, W. D., and Gardali, T., editors. 2008. California Bird Species of Special Concern: A ranked assessment of species, subspecies, and distinct populations of birds of immediate conservation concern in California. Studies of Western Birds 1. Western Field Ornithologists, Camarillo, California, and California Department of Fish and Game, Sacramento. Studies of Western Birds No. 1 SAN FRANCISCO COMMON YELLOWTHROAT (Geothlypis trichas sinuosa) Thomas Gardali and Jules Evens Criteria Scores Population Trend 10 Range Trend 0 Napa Population Size 7.5 Sonoma County County Range Size 10 Endemism 10 Population Concentration 0 Threats 5 Solano County San Pablo Bay Marin County Contra Costa County San Francisco County San Francisco Bay Alameda County San Mateo County Santa Clara County Breeding Range County Boundaries Kilometers Santa 8 4 0 8 Cruz County Breeding, and primary year-round, range of the San Francisco Common Yellowthroat, a California endemic; resi- dent in the breeding range, but some birds migrate to winter south to San Diego County. Outline of the overall range is stable, but numbers of breeders have declined at least moderately since 1944. 346 Studies of Western Birds 1:346–350, 2008 Species Accounts California Bird Species of Special Concern SPECIAL CONCERN PRIORITY HISTORIC RANGE AND ABUNDANCE Currently considered a Bird Species of Special IN CALIFORNIA Concern (year round), priority 3. Included on Grinnell and Miller (1944) described the breeding CDFG’s (1992) unprioritized list but not on the range as the “vicinity of San Francisco Bay, from original prioritized list (Remsen 1978). Tomales Bay, Marin County, and Napa Sloughs, southern Sonoma County, on the north, east to Carquinez Straight, and south to vicinity of San BREEDING BIRD SURVEY STATISTICS Jose, Santa Clara County.” Historic locations of FOR CALIFORNIA confirmed breeding include Lake Merced, San Francisco County, and Coyote Creek, Alviso, and Data inadequate for trend assessment (Sauer et Milpitas, Santa Clara County (CAS and MVZ al. 2005). egg set data). This yellowthroat was considered “common” by Grinnell and Miller (1944). Within its historic GENERAL RANGE AND ABUNDANCE range, it was probably closely tied to the distribu- The Common Yellowthroat (Geothlypis tri- tion of suitable freshwater and salt marshes with chas) breeds broadly from southeastern Alaska nearby willow thickets. across Canada south through the United States (very local in the southwest) into northern Baja RECENT RANGE AND ABUNDANCE California and the Pacific slope and central high- IN CALIFORNIA lands of Mexico (Guzy and Ritchison 1999). Birds The general outline of the breeding range today are resident in the very southern United States remains largely unchanged (see map). Despite lim- and in the Mexican breeding range, but northern ited historical data, it seems likely that the loss of breeders retreat to winter south to Panama and wetlands and riparian forests in the San Francisco the Caribbean. In North America, the highest Bay region (Goals Project 1999) greatly reduced breeding densities are mainly in the states of the overall numbers and extirpated this yellowthroat upper Midwest and Northeast and in adjacent locally within its range (Foster 1977). In contrast, Canada (Sauer et al. 2005). In California, the spe- yellowthroats appear to have increased in numbers cies breeds throughout much of the state, except in south San Francisco Bay since the early 1980s, in the higher mountains and most of the southern likely reflecting an increase in freshwater marsh deserts, and retreats from much of the north in habitats, as effluent has increased from water treat- winter (Grinnell and Miller 1944). ment plants and other sources (W. G. Bousman There is much debate regarding ranges and in litt.). The current range includes four main descriptions of subspecies of the Common areas: coastal riparian and wetland areas of west- Yellowthroat, with at least 13 commonly accepted ern Marin County, the tidal marsh system of San and others proposed (see summary and refer- Pablo Bay, the tidal marsh system of southern San ences in Guzy and Ritchison 1999). One of four Francisco Bay, and coastal riparian and wetland subspecies currently ascribed to California (Guzy areas in San Mateo County. Additionally, there and Ritchison 1999, P. Unitt in litt.), the San are some disjunct populations: Stafford Lake, Francisco (or Salt Marsh) Common Yellowthroat Marin County (Shuford 1993); Lake Merced, San (G. t. sinuosa) is endemic to the greater San Francisco County (unpubl. atlas data); and wet Francisco Bay region (Grinnell and Miller 1944), areas on San Bruno Mountain, San Mateo County as described below in detail. (unpubl. atlas data). The San Francisco Common Yellowthroat remains locally numerous in areas where, by SEASONAL STATUS IN CALIFORNIA today’s standards, extensive wetlands with adja- Occurs year round in the subspecies’ breed- cent riparian thickets remain. Estimates of total ing range. Breeds from mid-March to late July numbers of breeding pairs of sinuosa have varied (PRBO unpubl. data). Fall and winter specimens widely. Foster (1977) estimated 166 pairs for nine identified as sinuosa document occurrence of some counties encompassing its range, but that study individuals south along the coast to San Diego followed a severe drought, which may have tem- and casually north to Eureka (Grinnell and Miller porarily depressed population size. In 1975 and 1944, AOU 1957). 1976, Foster (1977) documented yellowthroats at San Francisco Common Yellowthroat 347 Studies of Western Birds No. 1 13 of 18 “areas” searched: areas with >20 breeding compromises the accuracy of the population size pairs were Coyote Hills Regional Park (27 pairs), estimate for this yellowthroat (Hobson et al. 1986, Alameda County; Pescadero Marsh (28–31 pairs), Raby 1992, Marshall and Dedrick 1994, Terrill San Mateo County; Olema Marsh (27 pairs), 2000). Marin County; and Napa Marsh (area bounded by Tolay Creek, the Napa River, San Pablo Bay, ECOLOGICAL REQUIREMENTS and Highway 121; 44 pairs), Napa, Sonoma, and Solano counties. In 1985, Hobson et al. (1986) Foster (1977) divided the breeding habitat of estimated 569 pairs from the same area Foster sinuosa into three broad types: woody swamp, (1977) covered, but during more favorable envi- brackish marsh, and freshwater marsh. For the ronmental conditions and with more fieldworkers. San Francisco Bay area as a whole, about 60% of Hobson et al. (1986) found breeding yellow- yellowthroats occupy brackish marsh, 20% ripar- throats in 23 of 25 locations searched: areas with ian woodland/swamp, 10% freshwater marsh, 5% >20 breeding pairs were Coyote Hills Regional salt marsh, and 5% upland (Hobson et al. 1986, Park (32 pairs), Alameda County; Coyote Creek Shuford 1993, Terrill 2000). This yellowthroat (includes Mud and Artesian sloughs; 98 pairs), occupies the ecotone between moist and upland Santa Clara County; Crystal Springs Reservoir (24 situations, thus the proximity of various habitat pairs), San Mateo County; Abbott’s Lagoon (25 types appears to enhance overall habitat suitability. pairs), Limantour Estero (74 pairs), Olema and Still, yellowthroats also use small and relatively Bear Valley marshes (25 pairs), Marin County; isolated patches of habitat, including swales and Petaluma Marsh (43 pairs), Sonoma County; and seeps, where groundwater is close to the surface, Napa Marsh (132 pairs), Napa, Sonoma, and but also occasionally nest in drier environments Solano counties. Population estimates in 2000 for (Hobson et al. 1986). In brackish and saline tidal marsh habitat were 500 birds (250 pairs) in tidal marsh habitat around San Francisco Bay, San Pablo Bay and about 70 birds in San Francisco yellowthroat abundance was positively associated Bay (PRBO unpubl. data). These data, how- with a high percent cover of rushes (Scirpus spp.), ever, do not include other suitable habitats (e.g., Peppergrass (Leipidium latifolium), and Juncus, freshwater, riparian) and may contain wintering height of the highest herbaceous plant, and vegeta- individuals of unknown racial identity. Where tion density over 30 cm (PRBO unpubl. data). At Hobson et al. (1986) reported none, the Santa the landscape level, the amount of marsh habitat Clara Breeding Bird Atlas (1987–1993) found in the surrounding 2000 m was a good predictor yellowthroats on Coyote Creek west of the conflu- of yellowthroat presence (PRBO unpubl. data). ence with Mud Slough, along Alviso Slough, and These data, however, also included birds from along Guadalupe Slough from about the Calabazas Suisun Bay, where subspecies identity is unclear. ponds to the Bay (W. G. Bousman in litt.). In The year-round diet of the Common 2003–2005, W. G. Bousman (in litt.) counted up Yellowthroat in California is roughly 99.8% ani- to 22 singing males along Guadalupe Slough near mal matter, mainly insects and spiders (Beal Salt Pond A4, where Hobson et al. (1986) had 1907). In a breeding season study of sinuousa in a found none, and up to 35 along the Alviso Slough freshwater marsh, Kelly and Wood (1996) found Trail, which includes some sites (e.g., Triangle diurnal, intraseasonal, and intersexual differences Marsh) where Hobson et al. found birds (W. G. in foraging behavior, which suggests the birds alter Bousman in litt.). Also, numbers of yellowthroats behavior in response to changing conditions (e.g., on the Palo Alto Summer Bird Count significantly varying hydrology, arthropod distributions and increased, by 5.9% per year, from 1981 to 2005 activity cycles, vegetation structure). (W. G. Bousman unpubl. data). Yellowthroats build open-cup nests that are Evens et al. (1997) estimated a population well concealed, typically near the ground in grass- size of 239 pairs within the Point Reyes National es, herbaceous vegetation (e.g., Poison Hemlock Seashore, Marin County, following a fire but [Conium maculatum]), cattails, tules, and some projected that the area would support about 300 shrubs (e.g., Coyote Brush [Baccharis pilularis]). pairs after the habitat recovered from fire effects.
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