Breeding Behavior, Distribution, and Conservation of the Sharp-Tailed Tyrant Culicivora Caudacuta
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ARTICLE Breeding behavior, distribution, and conservation of the Sharp-tailed Tyrant Culicivora caudacuta (Vieillot, 1818) (Aves: Tyrannidae), a South American grassland specialist Robson Silva e Silva¹ ¹ Independent Researcher. Santos, SP, Brasil. ORCID: http://orcid.org/0000-0002-4086-7106. E-mail: [email protected] Abstract. Culicivora caudacuta occurs in the Cerrado, Pampa and Chaco grasslands of Bolivia, Brazil, Paraguay, Argentina and Uruguay. Its breeding biology is poorly known. Here, I present a summary of the published information and new data gathered between 2003 and 2009 in southeast Brazil at Tapira, Minas Gerais. Breeding occurred during the rainy season (October to March), clutch size being three eggs. Juveniles and immatures show a different plumage from the adults, mostly brownish orange. All nests studied at Tapira showed evidence of cooperative breeding, with one helper engaged in incubation and provisioning the young. This is the first observations of this behavior for the species. The species has a wider range than currently understood and its presence in protected areas is similarly more common. Keywords. Nest description; Cooperative breeding; Eggs; Young plumage; Records. INTRODUCTION There are few studies of its biology and breed- ing behavior, the first data being gathered in The Sharp-tailed Tyrant Culicivora caudacuta Argentina in the early 20th century (Hartert & (Fig. 1) is a small tyrant flycatcher (Tyrannidae: Venturi, 1909), with little published since then. Elaeniinae) described in 1818 by Louis Jean Pierre Most of the available information refers to breed- Vieillot (1748-1830) as Muscicapa caudacuta (Le ing records and the presence of nests, young or Moucherolle a queue en aiguille), based on the immatures in the Brazilian states of Tocantins original description of the “Cola de agujas” (№ 277) (Dornas & Pascoal, 2019), Distrito Federal (Marini from Paraguay by Félix de Azara (1746-1821) et al., 2012), Goiás (Hass & Silva e Silva, 2008), (Vieillot, 1818). Later, in 1822, Coenraad Jacob Minas Gerais (Ribon et al., 1995; Silveira, 1998; Temminck (1778-1858) described the same bird Lombardi et al., 2010; Peixoto, 2014), Santa under the name Muscicapa stenura (Gobe-Mouche Catarina and Rio Grande do Sul (Fontana et al., a queue grêle), with an illustration (Fig. 2) based 2003; Rovedder et al., 2007; Fontana et al., 2008; on specimens (Fig. 3) collected in Brazil (São Paulo Repenning et al., 2010), and in Paraguay in Itapúa state) during the expedition of the Austrian nat- Department (Smith, 2017). uralist Johann Natterer (1787-1843) (Temminck, More detailed data on the breeding biolo- 1822; Cory & Hellmayr, 1927). Culicivora caudacuta occurs in central South gy of C. caudacuta were gathered at the Distrito America in habitats dominated by tall grasses and Federal (Braz, 2008; Sousa & Marini, 2007), Goiás bushes in the Cerrado, Chaco and Pampa of Bolivia, (Braz, 2008) and Minas Gerais (Silva e Silva, 2006) Brazil, Paraguay, Argentina and Uruguay (Azpiroz, in Brazil, and Formosa (Di Giacomo, 1996, 2005; Di 1998; Fitzpatrick, 2004; Lopes et al., 2009). Giacomo et al., 2011) in Argentina. Brazil accounts for most of the species’ range, Here I summarize all the available informa- with records in the states of Amazonas, Maranhão, tion on the distribution and breeding biology of Tocantins, Bahia, Mato Grosso, Mato Grosso do C. caudacuta, and add new data mostly based on Sul, Goiás, Distrito Federal, Minas Gerais, São observations carried out at Tapira, Minas Gerais Paulo, Paraná, Santa Catarina, and Rio Grande do state, southeast Brazil, with the first observations Sul (Lopes et al., 2009; WikiAves, 2020). of cooperative breeding by this species. Pap. Avulsos Zool., 2021; v.61: e20216165 ISSN On-Line: 1807-0205 http://doi.org/10.11606/1807-0205/2021.61.65 ISSN Printed: 0031-1049 http://www.revistas.usp.br/paz ISNI: 0000-0004-0384-1825 http://www.scielo.br/paz Edited by: Luís Fábio Silveira Received: 20/04/2021 Accepted: 17/06/2021 Published: 30/07/2021 Pap. Avulsos Zool., 2021; v.61: e20216165 Silva e Silva, R.: Culicivora caudacuta: breeding behavior, distribution, and conservation 2/27 MATERIAL AND METHODS Around the BD-5, as in the vicinity of Tapira and Araxá, there are also a few remnants of Atlantic Forest Study area fragments, especially along watercourses, and a few plantations of Eucalyptus sp. (Myrtaceae). The main study area is in the municipality of Tapira, The grasslands around BD-5 shelter several bird spe- southeast Minas Gerais, on the property of Fosfertil (now cies typical of the Cerrado including Red-winged Tinamou Mosaic Fertilizantes) known as Tapira Mining Complex (Rhynchotus rufescens), Spotted Nothura (Nothura macu- (Complexo de Mineração de Tapira – CMT). This covers an losa), Dwarf Tinamou (Taoniscus nanus), Ocellated Crake area of 7,150.86 ha, including the largest phosphate min- (Micropygia schomburgkii), Red-legged Seriema (Cariama ing operation in Latin America, with elevations from 950 cristata), Collared Crescentchest (Melanopareia torquata), to 1,300 m a.s.l. The area has several tailing dams (BDs) Crested Black-Tyrant (Knipolegus lophotes), Sedge Wren built to receive the discards from the mining process and (Cistothorus platensis), Grassland Sparrow (Ammodramus protect the watershed downstream from the CMT (Santos humeralis), Blue Finch (Porphyrospiza caerulescens), et al., 2002). One of these dams, BD-5 (Fig. 4) (19°49 36 S, Stripe-tailed Yellow-Finch (Sicalis citrina), Wedge- ′ ″ 46°50 14 W, elevation 1,160 m), covers an area of 46 ha, tailed Grass-Finch (Emberizoides herbicola), Plumbeous ′ ″ and was formed by the damming of the Potreiro and Boa Seedeater (Sporophila plumbea), and Black-masked Finch Vista creeks, showing varied aquatic habitats with cat- (Coryphaspiza melanotis). This assemblage, as well as gen- tails Typha domingensis (Typhaceae), muddy shores and eral habitat and setting, are very similar to those at Serra open-water areas with different depths. da Canastra National Park (Silveira, 1998), only 25 km away. This dam is surrounded by open Cerrado, with cam- Besides the BD-5, Culicivora caudacuta was also pos limpos (open grasslands) and campos sujos (grass- found and studied in another two areas in the CMT, one lands with scattered bushes) showing a mix of invasive in the 1,430.20 ha legal reserve upstream from the dam exotic grasses such as Melinis minutiflora (Poaceae) (19°51 44 S, 46°47 52 W, elevation 1,250 m), an area with ′ ″ ′ ″ and Brachiaria decumbens (Poaceae), and native ones very similar habitat, and near Ribeirão do Inferno, anoth- as Echinolaena inflexa (Poaceae), with scattered bush- er similar area covering 510 ha partially included in the es, such as Baccharis dracunculifolia (Asteraceae) and municipality of Araxá (19°46 22 S, 46°52 48 W, elevation ′ ″ ′ ″ Solanum lycocarpum (Solanaceae), among others. 1,240 m). Figure 1. Adult Sharp-tailed Tyrant Culicivora caudacuta, (11 October 2011), Figure 2. Illustration of Muscicapa stenura (Culicivora caudacuta), by Jean- Patrocínio, Minas Gerais, Brazil. Photo: RSS. Gabriel Prêtre, in Temminck’s work, with a wrongly drawn tail. Figure 3. Specimen (RMNH 88812) of Culicivora caudacuta used in Figure 4. Partial view of BD-5 showing the study site at CMT, Tapira, Minas Temminck’s description. Photo: RSS. Gerais (18 June 2009). The arrow shows where nests were found. Photo: RSS. Silva e Silva, R.: Culicivora caudacuta: breeding behavior, distribution, and conservation Pap. Avulsos Zool., 2021; v.61: e20216165 3/27 Dairy ranching is the main economic activity in the BD-5, where the birds were more habituated to human region where CMT is located but grazing animals are ex- presence and, when nests were located, monitoring cluded from the dam area and the legal reserve. Grazing caused little interference in their behavior. Nests were has transformed the native grasslands in open land- not tagged with tape or other markers to avoid attract- scapes dominated by African grasses with some remnant ing predators. native plants. Fires for “pasture renovation” are frequent Additional data on the breeding biology and locali- and have a direct impact on the avifauna, especially ties were gathered from records at Wikiaves (http://www. grassland-dependent species. wikiaves.com.br), xeno-canto (http://www.xeno-canto. Supplementary observations on the breeding biolo- org), Macaulay Library (http://www.macaulaylibrary.org), gy of C. caudacuta were made in two additional areas. The eBird (http://www.ebird.org), and from personal com- first was in the municipality of Patrocínio, in the Triângulo munications by fellow researchers. Mineiro and Alto Paranaíba region of Minas Gerais, about 100 km from CMT. There the species was recorded more frequently in the headwaters of the Córrego Bebedouro RESULTS AND DISCUSSION (19°00 06 S, 46°46 07 W, elevation 1,012 m), an area be- ′ ″ ′ ″ longing to Mosaic Fertilizantes, and in the headwaters of Breeding behavior the Córrego do Mato (19°09 37 S, 46°55 28 W, elevation ′ ″ ′ ″ 1,005 m), Córrego do Fundão (19°06 49 S, 46°54 07 W, Breeding season ′ ″ ′ ″ elevation 1,184 m), and Córrego Capoeira Grande (19°11 42 S, 46°55 56 W, elevation 1,049 m). Culicivora caudacuta was first recorded at CMT on 26 ′ ″ ′ ″ The second area, also in Minas Gerais, in the mu- November 2002 at BD-5, the same spot where nests were nicipality of Paracatu, includes the headwaters of the found, and in another two areas along the reservoir. Ribeirão Batalha (17°29 48 S, 47°15 48 W, elevation At CMT, the breeding season occurs from October to ′ ″ ′ ″ 880 m) at the border with Goiás state and the municipal- March (Silva e Silva, 2006), considering the time the first ity of Catalão, about 260 km from CMT. The area has rem- nests were found to the latest date fledglings were fed nant veredas dominated by Mauritia palm swamps bor- by their parents. The actual start of the nesting period dered by hydromorphic grasslands on undulated terrain is probably September since nest building take 10 to 15 and grasslands with mounds built by termites campos de days (Di Giacomo, 2005).