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Song Sparrow (Melospiza Melodia) ("Modesto" Population)

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Song Sparrow (Melospiza Melodia) ( II SPECIES ACCOUNTS Andy Birch PDF of Modesto Song Sparrow 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 SONG SPARROW (Melospiza melodia) (“Modesto” population) Thomas Gardali Criteria Scores Population Trend 10 Range Trend 0 Population Size 5 Range Size 10 Endemism 10 Population Concentration 0 Threats 5 Year-round Range County Boundaries Water Bodies Kilometers 100 50 0 100 Year-round range of the Modesto Song Sparrow, which has declined in numbers at least moderately. Restricted to California, where it is locally numerous in the Sacramento Valley, Sacramento–San Joaquin River Delta, and northern San Joaquin Valley. Exact boundaries of range uncertain, but mapped distribution is conservative relative to prior attempts, which may have exaggerated the western and, particularly, eastern limits. 400 Studies of Western Birds 1:400–404, 2008 Species Accounts California Bird Species of Special Concern SPECIAL CONCERN PRIORITY Stanislaus County. Within its historic range, this sparrow was probably closely tied to the distribu- Currently considered a Bird Species of Special tion of suitable freshwater wetlands and early suc- Concern (year round), priority 3. Not included on cessional riparian thickets. prior special concern lists (Remsen 1978, CDFG Historic locations of confirmed breeding 1992). include Butte Creek in Butte, Colusa, and Sutter counties; Colusa, Colusa County; Sacramento, REEDING IRD URVEY TATISTICS B B S S Sacramento County; Stockton, San Joaquin FOR CALIFORNIA County; and the confluence of the San Joaquin Data inadequate for trend assessment (Sauer et and Tuolumne rivers, Stanislaus County (Grinnell al. 2005). and Miller 1944; WFVZ, CAS, and MVZ egg set data). Grinnell and Miller (1944) may have GENERAL RANGE AND ABUNDANCE exaggerated the eastern limit of the range, which they extended into the Sierra Nevada foothills, Song Sparrows (Melospiza melodia) range from as they presented no records for that region southern Alaska across central and southern and stated that birds above 200 ft (61 m) may Canada south through the United States into not be the Modesto form. The former status of northern (locally to central) Mexico and Baja Song Sparrows west of the Sacramento River in California; sparrows occupy a large part of north- Colusa County also is unclear, as few perma- ern range in summer only, much of mid-central nent wetlands may have occurred there histori- and southern portion in winter only (AOU 1998, cally (J. Silveira pers. comm.), and again Grinnell Arcese et al. 2002). In California, the species is and Miller (1944) presented no records for that resident in much of the state except for the higher region. However, almost annual flooding of the mountains and most of the southeastern deserts Sacramento Valley’s rivers created a shifting mosa- away from the Salton Sink and Colorado River ic of habitats, including early successional stages valley (Grinnell and Miller 1944, Small 1994). of riparian forests, oxbow lakes, and seasonal to Of the 24 subspecies currently recognized, 9 permanent wetlands, to which this Song Sparrow occur in California (Patten 2001, Arcese et al. was probably well adapted. 2002). Until Patten’s (2001) revision, the popula- tion of Song Sparrow described here was consid- RECENT RANGE AND ABUNDANCE ered to be a valid subspecies (the Modesto Song IN CALIFORNIA Sparrow, M. m. mailliardi), and may again be, pending further research. The general outline of the breeding range today The Modesto Song Sparrow is endemic to remains largely unchanged (see map). Despite California, where it resides only in the north-cen- limited historical data, it seems likely the over tral portion of the Central Valley (Grinnell and 90% loss of wetlands and riparian forests in the Miller 1944, AOU 1957). Highest densities occur Central Valley (Thompson 1961, Frayer et al. in the Butte Sink area of the Sacramento Valley 1989) greatly reduced overall numbers and extir- and in the Sacramento–San Joaquin River Delta pated this sparrow locally within its range. (PRBO unpubl. data). The Modesto Song Sparrow remains local- ly numerous in areas where, by today’s stan- SEASONAL STATUS IN CALIFORNIA dards, extensive wetlands remain. Hence, the A year-round resident; breeds from mid-March to Sacramento–San Joaquin River Delta and Butte early August (PRBO unpubl. data). Sink areas represent current centers of abundance for this sparrow (PRBO unpubl. data, T. Gardali HISTORIC RANGE AND ABUNDANCE pers. obs.). In the northern portion of its range, Song Sparrows occur in low densities at Delevan IN CALIFORNIA and Colusa NWRs and are absent as breeders Grinnell and Miller (1944) described the Modesto from the Sacramento NWR (PRBO unpubl. Song Sparrow as a “common” resident occur- data). Immediately adjacent to the Butte Sink, ring primarily below 200 ft (61 m) elevation in Song Sparrows breed in sparsely vegetated irriga- the Central Valley from Colusa County in the tion canals, yet are almost entirely absent from Sacramento Valley south through the Sacramento– the main stem and tributaries of the Sacramento San Joaquin River Delta (exclusive of Suisun River above Sacramento. In addition to sites men- Marsh) to the northern San Joaquin Valley of tioned above, extensive summer surveys north Modesto Song Sparrow 401 Studies of Western Birds No. 1 of Sacramento during 1998 to 2000 located Studies of population limiting factors of the Song Sparrows at Perkins and Eddy lakes, Butte Modesto Song Sparrow are lacking. In general, County; the northernmost limit of Little Butte however, lack of early successional habitats and Creek, Butte County; along the Sacramento River, wetlands may be limiting this sparrow. For exam- Colusa and Sutter counties; and west of Tisdale, ple, nest success was extremely low in the mature Sutter County (PRBO unpubl. data). Singing forests along the Cosumnes River yet was relatively Song Sparrows also occur in roadside irrigation high in young restoration plots (Haff 2003). The ditches east of the Sacramento River above the Modesto Song Sparrow may be sensitive to factors Tisdale Bypass, Sutter County (T. Manolis in litt.), identified in studies of other subspecies of Song and within Sutter NWR (D. Gilmer in litt.). Sparrows. In a wetland-breeding population in Song Sparrows also are numerous in the delta, coastal British Columbia, for example, high levels particularly in southwestern Sacramento County of nest predation coupled with Brown-headed (T. Manolis in. litt.) and northwestern San Cowbird (Molothrus ater) parasitism reduced the Joaquin County (PRBO unpubl. data). Unlike birth rate below that needed to offset adult mortal- in the Butte Sink, Song Sparrows in the delta and ity (a population “sink”; Rogers et al. 1997). Indeed, northern San Joaquin Valley are locally numerous nest predation and, to a lesser extent, cowbird along riparian corridors, such as the Cosumnes parasitism were the primary factors responsible for and Stanislaus rivers (DiGaudio and Geupel nest failure at Cosumnes (DiGaudio and Geupel 1998, PRBO unpubl. data), and sparse along 1998, Haff 2003). Additionally, the sparrows’ vegetated irrigation canals and levees (T. Gardali inability or lack of opportunity to disperse may be pers. obs.). Song Sparrows are also sparse along the limiting this population in some parts of its range. Mokelumne River where the habitat is primarily Habitats such as those along the Sacramento River mature (J. Hammond in litt.). have few breeding Song Sparrows, yet the sparrow is abundant at the Butte Sink roughly 10 km away ECOLOGICAL REQUIREMENTS (PRBO unpubl. data). Elsewhere, however, this sparrow rapidly colonized a wastewater treatment The ecological requirements of the Modesto Song wetland in Sacramento County two years after its Sparrow are largely undescribed. Grinnell and construction (Jones et al. 1998). Miller (1994) noted this population’s affinity for emergent freshwater marshes dominated by tules THREATS (Scirpus spp.) and cattails (Typha spp.) as well as riparian willow (Salix spp.) thickets. These Song Habitat loss, fragmentation, and degradation may Sparrows also nest in riparian forests of Valley Oak be the primary threats to the Modesto Song (Quercus lobata) with a sufficient understory of Sparrow. Reproductive failure caused by inflated blackberry (Rubus spp.), along vegetated irrigation levels of nest predation is likely a threat to this canals and levees, and in recently planted Valley population. Most nest failure (90%) at Cosumnes Oak restoration sites (DiGaudio and Geupel was caused by nest predation (Haff 2003). Habitat 1998, PRBO unpubl. data). conversion may benefit both native and non-native Marshall (1948) described the primary habitat nest predators. Potential predators at Cosumnes requirements of several subspecies of Song Sparrow include feral domestic cats (Felis catus), Raccoons in California as being moderately dense vegetation (Procyon lotor), Striped Skunks (Mephitis mephi- to supply cover for nest sites, a source of stand- tis), Opossums (Didelphis marsupialis), Black ing or running water, semiopen canopies to allow Rats (Rattus rattus), Norway Rats (R. norvegi- light, and exposed ground or leaf litter for foraging.
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