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Striped-Tailed Yellow-Finch Nesting Success in Abandoned Mining Pits

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Striped-Tailed Yellow-Finch Nesting Success in Abandoned Mining Pits http://dx.doi.org/10.1590/1519-6984.10813 Original Article Striped-tailed Yellow-finch nesting success in abandoned mining pits from central Brazilian cerrado Gressler, DT.a* and Marini, MÂ.b aPrograma de Pós-Graduação em Ecologia, Instituto de Ciências Biológicas, Universidade de Brasília - UnB, Asa Norte, Campus Universitário Darcy Ribeiro, CEP 70910-900, Brasília, DF, Brazil bDepartamento de Zoologia, Instituto de Ciências Biológicas, Universidade de Brasília - UnB, Asa Norte, Campus Universitário Darcy Ribeiro, CEP 70910-900, Brasília, DF, Brazil *e-mail: [email protected] Received: June 18, 2013 – Accepted: October 25, 2013 – Distributed: March 31, 2015 Abstract Suitability of degraded areas as breeding habitats can be tested through assessment of nest predation rates. In this study we estimated nest success in relation to several potential predictors of nest survival in the Stripe-tailed Yellow- finch (Sicalis citrina) breeding in abandoned mining pits at Brasília National Park. We monitored 73 nests during the 2007-breeding season. Predation was the main cause of nest failure (n = 48, 66%); while six nests were abandoned (8%) and 19 nests produced young (26%). Mayfield’s daily survival rates and nest success were 0.94 and 23%, respectively. Our results from nest survival models on program MARK indicated that daily survival rates increase linearly towards the end of the breeding season and decrease as nests aged. None of the nest individual covariates we tested - nest height, nest size, nest substrate, and edge effect - were important predictors of nest survival; however, nests placed on the most common plant tended to have higher survival probabilities. Also, there was no observer effect on daily survival rates. Our study suggests that abandoned mining pits may be suitable alternative breeding habitats for Striped-tailed Yellow-finches since nest survival rates were similar to other studies in the central cerrado region. Keywords: nest survival, Emberizidae, breeding habitat, degraded habitat, neotropical savanna. Sucesso reprodutivo de Sicalis citrina em cascalheiras abandonadas, região central do Cerrado Resumo A adequação de habitats degradados para reprodução de aves pode ser testada por meio de avaliação das taxas de predação de ninhos. Neste estudo nós estimamos o sucesso de nidificação do canário-rasteiro (Sicalis citrina) e o relacionamos, por meio de modelagem no programa MARK, com diversos fatores que potencialmente afetam a sobrevivência dos ninhos da espécie em antigas áreas de extração de solo (cascalheiras), no Parque Nacional de Brasília, Distrito Federal. Nós monitoramos 73 ninhos da espécie durante a estação reprodutiva de 2007. Predação foi a principal causa da perda de ninhos (n = 48, 66%), enquanto seis foram abandonados (8%) e 19 produziram ao menos um filhote (26%). A taxa diária de sobrevivência e o sucesso total de Mayfield foram 0,94 and 23%, respectivamente. Nossos resultados, obtidos da modelagem de sobrevivência, indicaram que as taxas de sobrevivência diária dos ninhos aumenta linearmente à medida que avança a estação reprodutiva, ao passo que diminui conforme a idade do ninho aumenta. Nenhum dos fatores que testamos – altura do ninhos, tamanho dos ninhos, planta suporte e distância até a borda dos ambientes de cascalheira – mostraram-se importantes como fatores determinantes do sucesso dos ninhos. Entretanto, ninhos construídos nas plantas mais comuns na área de estudo (samambaias) apresentaram maior tendência de sucesso que os demais. Adicionalmente, não houve interferência do observador nas estimativas de sobrevivência dos ninhos. Nossos resultados sugerem que as antigas áreas de cascalheira podem ser adequadas para a reprodução do canário-rasteiro, uma vez que as taxas de sobrevivência que encontramos neste estudo são similares às encontradas em estudos com outras espécies na região central do Cerrado. Palavras-chave: sobrevivência de ninhos, Emberizidae, habitat de reprodução, habitats degradados, savana neotropical. 1. Introduction The migrant Stripe-tailed Yellow-finch (Sicalis citrina America (Hilty and Brown, 1986; Ridgely and Tudor Pelzeln, 1870) inhabits rocky mountain slopes and open 1989; Sick 1997). In central Brazilian cerrado the species cerrados, and has a widespread distribution in South is commonly found in degraded areas (abandoned mining Braz. J. Biol., 2015, vol. 75, no. 1, p. 191-197 191 Gressler, DT. and Marini, MÂ. pits) during the breeding season (Dec-May; Gressler and with scarce grass cover. Climate in the cerrado region is Marini, 2011). Artificial habitats may be important for seasonal, with a dry season from April/May to September/ conservation and management as they provide breeding October. Mean annual temperature varies from 21-22 °C habitat diversity and may be the only option when natural (ranging from 17-27 °C), and mean annual rainfall from habitats have been destroyed or converted due to human 1400-1600 mm (Silva et al., 2008). land use (Catry et al., 2004). However, habitats chosen 2.2. Study species by birds for nesting must exhibit features that lead to congruence between habitat preference and reproductive Stripe-tailed Yellow-finch (Sicalis citrina, Emberizidae) success (Chalfoun and Schmidt, 2012), of which nest has a wide distribution in South America, ranging from survival is an important component (Martin, 1993a). Suriname to Argentina (Hilty and Brown, 1986; Sick Nest predation is often the major cause of nesting 1997). It is usually found in rocky grasslands, often called failure in birds (Ricklefs, 1969; Martin, 1995). Many “campo rupestre”, and also in open cerrados, including factors are traditionally invocated to explain patterns of pastures and agricultural lands (Hilty and Brown, 1986; nest predation in birds worldwide, such as nest physical Stotz et al., 1996; Sick, 1997, Vasconcelos et al., 2007). characteristics (Møller, 1987), nest site and surrounding The species is present in central Brazilian cerrados mostly habitat features (Martin and Roper, 1988; Martin 1993a), during the raining season, and is rarely found in the region nest height above ground (Møller, 1987; Martin, 1993b), during the dry season (Braz, 2008). Abandoned mining pits and numerical predator’s responses (Patnode and White, at BNP are the preferred breeding habitat of the species 1992; Sloan et al., 1998). Temporal parameters are also during the nesting season (Gressler and Marini, 2011). important, e.g. higher nest success rates can be expected, Such areas apparently act as substitute for the natural in some cases, in the end of the nesting season due to “campo rupestre” habitat most used by the species along increased vegetation cover for nest concealment (Wiebe its distribution. Nests are open-cups built mostly in ferns and Martin, 1998). (~62%), but also in small shrubs (~22%) and grass tussocks The breeding behavior of the Stripe-tailed Yellow-finch (~15%), at average 30 cm from the ground, ranging from in abandoned mining pits gives rise to questions about the 0.1 to 0.6 m height (Gressler and Marini, 2011). Clutch suitability of such abandoned degraded areas as breeding size varies from two to three eggs. Incubation period habitats. To assess this question we compared Stripe-tailed lasts 11.8 ± 0.3 days, and nestlings fledge at about 12.8 ± Yellow-finch’s nest success with data from other passerines 0.4 days-old. Egg laying occurs on consecutive days and reproducing in anthropic and natural neotropical habitats. incubation starts after the laying of the last egg. More We also estimated Mayfield’s (1961; 1975) nest survival details on the species reproductive biology can be found rates, and nest success in relation to some variables usually in Gressler and Marini (2011). used to explain variation in daily survival rates (DSR) of Potential Stripe-tailed Yellow-finch nest predators birds’ nests using Stripe-tailed Yellow-finches as model: with relevant importance due to their conspicuousness in (a) temporal variation across the breeding season, (b) the old mining areas are the Southern Caracara (Caracara nest age, (c) nest height, (d) nest size, (e) nest substrate plancus (Miller, 1777), Falconidae) and the Burrowing (plant used for nest placement), (f) edge effect, and also Owl (Athene cunicularia (Molina, 1782), Strigidae). Also, controlled for (g) observer effect. birds such as Greater Ani (Crotophaga ani Linnaeus, 1758), Guira Cuckoo (Guira guira (Gmelin, 1788), 2. Material and Methods Cuculidae), and some passerines, such as White-banded Tanager Neothraupis fasciata (Lichtenstein, 1823), White- 2.1. Study area rumped Tanager Cypsnagra hirundinacea (Lesson, 1831) We conducted fieldwork in central Brazilian cerrado (Thraupidae) and Curl-crested Jay Cyanocorax cristatellus (savanna-like habitat) at Brasília National Park (BNP; 15° (Temminck, 1823) (Corvidae) are thought to be important 35’ – 15° 45’ S, 48° 05’ – 48° 52’ W). This reserve covers nest predators in the cerrado region (França et al., 2009). more than 30.000 ha of typical cerrado biome vegetation, Potential mammalian predators include White-eared from grasslands to gallery forests, and disturbed areas Opossum (Didelphis albiventris Lund, 1840), feral dogs that include many abandoned mining pits. Mining pits at (Canis familiaris Linnaeus, 1758), and small rodents. BNP were created due to the removal of the upper soil layers during the 1950’s-1960’s, when the city of Brasília 2.3. Nest search and monitoring was under construction. This areas still have extensive From mid-January to early
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