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Sturnella defilippii

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA AVES PASSERIFORMES ICTERIDAE

Scientific Name: Sturnella defilippii
Species Authority: (Bonaparte, 1850)
Common Name(s):
English Pampas Meadowlark
Synonym(s):
Sturnella defilippi defilippi Stotz et al. (1996)
Sturnella militaris militaris Collar et al. (1994)
Sturnella militaris militaris Sibley and Monroe (1990, 1993)
Taxonomic Notes: Leistes militaris, Red-breasted Blackbird (Sibley and Monroe 1990, 1993) has been placed in the genus Sturnella following Short (1968). Consequently S. militaris, Pampas Meadowlark (Sibley and Monroe 1990, 1993) takes the name S. defilippii. In Collar et al. (1992, 1994), S. militaris was wrongly assigned to the Pampas Meadowlark.

Assessment Information [top]

Red List Category & Criteria: Vulnerable A2ce+3ce+4ce;B1ab(i,ii,iii,iv,v) ver 3.1
Year Published: 2012
Date Assessed: 2012-05-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Azpiroz, A. & Fraga, R.
Facilitator/Compiler(s): Gilroy, J., Harding, M., Pople, R., Sharpe, C J, Khwaja, N.
Justification:
This species has a small and declining population within a restricted range. Landscape conversion for agriculture is causing rapid declines in the area of suitable habitat, with inevitable impacts on population size. However, recent surveys have found higher densities than previously thought within breeding areas. It currently qualifies as Vulnerable, although future increases in the rate of decline could result in uplisting to Endangered.

Geographic Range [top]

Range Description: Sturnella defilippii was formerly common and widespread in east-central Argentina and Uruguay (Cotinga 1995, Azpiroz 2005), but always rare in south Brazil (four winter records from Paraná, Santa Catarina, and Rio Grande do Sul). Since 1900, its range has decreased by 90%, with most of this decline occurring between 1900 and 1950 (Tubaro et al. 1994, Tubaro and Gabelli 1999). In 1992-1993, the extent of occurrence in Argentina was estimated at 8,000 km2, the area of occupancy at 150 km2 and the population at c.7,500 birds (Tubaro and Gabelli 1999), whilst in Uruguay the breeding population was estimated at 78-90 pairs in the Arerunguá area (Azpiroz 2005). In 2004, a detailed study estimated the extent of occurrence in Argentina at 4,810 km2, and hence a range contraction of 30% within 10 years, although more intensive sampling revealed higher densities than previously estimated, with an area of occupancy of 512 km2 and a minimum population size of 28,000 individuals (Gabelli et al. 2004). These are concentrated in south-west Buenos Aires and adjacent La Pampa, with records in Entre Ríos, San Luis, Córdoba and Corrientes (Tubaro and Gabelli 1999, R. Fraga in litt. 2012).

Countries:
Native:
Argentina; Brazil; Uruguay
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The population is estimated to number over 28,000 individuals, based on recent estimates from studies in Argentina and Uruguay, the only known breeding areas.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: It inhabits natural grasslands (vegetation height of 29-45 cm), including land abandoned for 5-15 (or more) years (Tubaro et al. 1994). Some birds breed and winter in planted pastures and cultivated fields with a similar vegetation structure (Tubaro and Gabelli 1999). However, a study in Buenos Aires province found that 90% of reproductive groups were present in natural grasslands with high vegetation cover (Fernandez et al. 2004). It can coexist with cattle, but apparently avoids planted pasture, as well as areas where grazing is more intensive and vegetation height is consequently lower (Tubaro and Gabelli 1999). Breeding occurs between mid-October and November, and 3-4 eggs are laid (Azpiroz 2005). The diet includes seeds, insects and shoots. There is some northwards movement in winter, but it is primarily resident (Tubaro and Gabelli 1999).

Systems: Terrestrial

Threats [top]

Major Threat(s): Rapid and widespread conversion to cattle-ranching, arable and plantation agriculture are primarily responsible for long-term declines. It is now restricted to areas least suitable for agriculture , although the rate of grassland conversion within occupied areas continues to outstrip the rate of grassland regeneration by three to one (Gabelli et al. 2004). Other factors may interact with habitat loss, including high rates of nest predation (Cozzani et al. 2004), although recent studies in Uruguay suggest that this may have only a limited effect (A. Azpiroz in litt. 2007). Trampling by cattle (Gabelli et al. 2004), and brood parasitism by Shiny Cowbird Molothrus bonariensis (Cozzani et al. 2004, Gabelli et al. 2004) could also influence productivity, although parasitism appears to be rare (Cozzani et al. 2004, A. Azpiroz in litt. 2007). Maintenance of moderate grazing regimes appears to favour the species (Zalba et al. 2008). Competition with Long-tailed Meadowlark S. loyca and White-browed Blackbird Leistes superciliaris could negatively influence this species (Tubaro and Gabelli 1999), although studies have found no evidence that presence of either species affects site selection (Gabelli et al. 2004). Capture for trade is not currently extensive (Tubaro and Gabelli 1999), but, in 1988, over 100 birds were seen in local markets (Bertonatti and Tubaro 1993).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
It is protected under Brazilian and Uruguayan law and from trapping in Argentina. Studies have clarified its distribution , numbers and habitat requirements (Tubaro et al. 1994, Tubaro and Gabelli 1999, Fernandez et al. 2004, Gabelli et al. 2004, Azpiroz 2005). In northern Uruguay, educational visits to schools were carried out in association with surveying in 2003 (Azpiroz 2005).

Conservation Actions Proposed
Manage agricultural land to ensure that habitat loss does not exceed habitat gain. Survey south Córdoba and south-east San Luis to locate any remnant populations. Monitor the population. Assess the impact of inter-specific competition. Determine the threat posed by high nest failure rates owing to predation, trampling and brood parasitism by Shiny Cowbird.


Citation: BirdLife International 2012. Sturnella defilippii. The IUCN Red List of Threatened Species. Version 2014.3. <www.iucnredlist.org>. Downloaded on 18 December 2014.
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