Territory Distribution and Habitat Selection of the Serra Finch (Embernagra longicauda) in Serra Do Cipó, Brazil

Freitas, Guilherme H. S.; Rodrigues, Marcos

doi:10.1676/10-143.1

Cited by 13 publications

(9 citation statements)

References 31 publications

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“…This species has population density three to four times higher than P. cinerea in our study (Freitas and Rodrigues, 2012). However, this is not sufficient to account P. cinerea as locally rare.…”

Section: Discussioncontrasting

confidence: 59%

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New insights on the rarity of the vulnerable Cinereous Warbling-finch (Aves, Emberizidae) based on density, home range, and habitat selection

2014

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The Cinereous Warbling-finch Poospiza cinerea (Emberizidae) is a Neotropical grassland bird considered rare, with population declining due to habitat loss and classified as vulnerable. However, the species conspicuously remains in several degraded areas, suggesting that it may be favored by these environments. Studies which focus on this species were inexistent until 2012, making questionable any statement about its threaten status. Here we analyzed population density, home range, and habitat selection of two groups of P. cinerea at independent sites that differ in human impact levels. Density was estimated by counting and mapping birds. Kernel density and minimum convex polygon were used to estimate home ranges. Habitat selection was inferred from use and availability of every habitat identified within the home range boundaries. One group positively selected urban tree vegetation, despite the availability of natural habitats in its home range. Based on a review on the literature and our findings, we assume that it is unlikely that P. cinerea is rare owing to habitat degradation, as previously thought. Nevertheless, this species was always recorded around native Cerrado vegetation and thus habitat modification may still threaten this species at some level. It is suggested that this species might be a woodland edge species, but future studies are necessary to confirm this assumption.Keywords: rare species, Brazilian cerrados, degraded habitats, threatened species, edge effect.Esclarecimentos sobre a raridade do vulnerável capacetinho-do-oco-do-pau (Aves, Emberizidae) baseados em densidade populacional, área de vida e seleção de habitat ResumoO capacetinho-do-oco-do-pau Poospiza cinerea (Emberizidae) é um passeriforme neotropical de ambientes abertos, considerado raro e cuja população está em declínio devido à perda de habitat, sendo classificada como vulnerável. No entanto, a espécie tem sido observada com frequência em vários locais impactados, sugerindo que possa ser favorecida por esse tipo de ambiente. Estudos focados nessa espécie são escassos, o que nos leva a questionar qualquer afirmação sobre seu status de conservação. Nós analisamos a densidade populacional, área de vida e seleção de habitat de dois grupos de P. cinerea em dois locais independentes, que diferiam quanto ao grau de conservação. A densidade foi estimada por contagem e mapeamento das aves. Utilizamos Kernel density e Mínimo Polígono Convexo para estimar as áreas de vida. A seleção de habitat foi inferida a partir do uso e disponibilidade dos habitats nas áreas de vida. Um grupo selecionou positivamente árvores urbanas, apesar de ampla disponibilidade de vegetação natural na área de vida. Com base na revisão de literatura e também em nossas observações, consideramos improvável que a espécie seja rara devido à degradação de habitats naturais como anteriormente sugerido. Mesmo assim, a espécie sempre é observada em ambientes que contém vegetação nativa de Cerrado e, portanto, a degradação desse bioma pode ainda ser uma ameaça. É sugeri...

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Section: Discussioncontrasting

confidence: 59%

“…Home range data of related species on the same region are available only for E. longicauda (Freitas and Rodrigues, 2012). This species has a home range six times smaller than P. cinerea.…”

Section: Discussionmentioning

confidence: 99%

New insights on the rarity of the vulnerable Cinereous Warbling-finch (Aves, Emberizidae) based on density, home range, and habitat selection

2014

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“…When replacement occurs, new individuals tend to adjust their territories within the same territorial boundaries as their predecessors (Greenberg and Gradwohl 1986). There was little overlap between neighboring territories, as also observed for E. herbicola, Embernagra longicauda and Neothraupis fasciata (Freitas and Rodrigues 2012, Duca and Marini 2014.…”

Section: Discussionmentioning

confidence: 59%

Breeding biology of the Lesser Grass-Finch (Emberizoides ypiranganus) in southern Brazilian upland grasslands

Chiarani¹,

Fontana²

2015

The Wilson Journal of Ornithology

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“…We counted all adult territorial birds (banded and not banded) within the boundaries of our study area during the breeding season (Gregory et al. , Freitas and Rodrigues ). For each day of sampling, we searched for the birds in all or most of the study area, allowing us to avoid double‐counting unmarked individuals.…”

Section: Methodsmentioning

confidence: 99%

Spatial ecology and conservation of the microendemic ovenbird Cipo Cinclodes (Cinclodes espinhacensis) from the Brazilian highlands

et al. 2019

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Birds in the genus Cinclodes are habitat specialists, with most restricted to the highlands of South America. The recently described Cipo Cinclodes (C. espinhacensis) is isolated in the southern Espinhaço Range of Brazil and is considered Endangered in Brazil and Near Threatened by the IUCN, but as a subspecies of Long‐tailed Cinclodes (C. pabsti). We examined the population and spatial ecology of Cipo Cinclodes at two geographic scales to improve our understanding of their basic biology and conservation status. We monitored 30 birds at Serra do Breu and found relatively large home ranges (mean = 9.3 ha), a density of paired adults of 0.09/ha, a male‐skewed adult sex ratio (males/total adults = 0.57) due to territories occupied by unpaired males, and long‐term site fidelity. Cipo Cinclodes used all habitat types available in our study area, including rocky outcrops, grasslands, and riparian areas, but habitat selection analyses revealed the importance of riparian areas for foraging and rocky outcrops for nesting. At the species distribution scale, we compiled known and novel recorded occurrence points and used them to calculate the extent of occurrence (EOO) and the area of occupancy (AOO). We used a Maxent species distribution model to generate a binary map to estimate upper limits for EOO (EOO around the model predicted area) and AOO (comprised by the model predicted area within the EOO). We obtained 41 locations, resulting in an EOO of 890.7 km2 (up to 1748.7 km2) and an AOO of 100 km2 (up to 327.5 km2). The global population is estimated to be between 880 and 2882 birds, which is concerning because small populations are at risk of extinction due to demographic stochasticity, genetic drift, and the interaction of these factors. As such, our results support the designation of Cipo Cinclodes as Endangered on the Brazilian red list.

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Territory Distribution and Habitat Selection of the Serra Finch (Embernagra longicauda) in Serra Do Cipó, Brazil

Cited by 13 publications

References 31 publications

New insights on the rarity of the vulnerable Cinereous Warbling-finch (Aves, Emberizidae) based on density, home range, and habitat selection

New insights on the rarity of the vulnerable Cinereous Warbling-finch (Aves, Emberizidae) based on density, home range, and habitat selection

Breeding biology of the Lesser Grass-Finch (Emberizoides ypiranganus) in southern Brazilian upland grasslands

Spatial ecology and conservation of the microendemic ovenbird Cipo Cinclodes (Cinclodes espinhacensis) from the Brazilian highlands

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