Topic
Gnateater
About: Gnateater is a research topic. Over the lifetime, 5 publications have been published within this topic receiving 21 citations. The topic is also known as: Conopophagidae.
Papers
TL;DR: By estimating population growth, even in short-term studies, testable hypotheses can be generated that will allow better understanding of population dynamics, and low apparent adult survival suggests that territories are not permanent, perhaps abandoned after nest failure.
Abstract: Population structure and dynamics of the black-cheeked gnateater (Conopophaga melanops) were studied at Salto Morato Nature Reserve, in Paran´ a, southern Brazil, from October 2006 to September 2007. Territory size and population density, breeding season (timing and length), reproductive success and annual survival rates were estimatedfromsightingsof18markedadultbirdsandthesuccessof18nestingattempts.Theblack-cheekedgnateater is socially monogamous and territorial, with a breeding-season length of approximately 3 mo beginning in early October. Predation caused most nest failures, nest survival was 0.96 d −1 and apparent annual nesting success was 22%, resulting in annual productivity of 0.36 individuals per adult. Apparent adult annual survival was ∼0.44 y −1 . Seventy-five per cent of fledglings survived at least 2 mo after fledging. Two methods of estimating population growth ratesuggestverydifferentrates:r =− 0.04(∼stable),or λvariesbetween0.475-0.616(declining).Yet,lowapparent adult survival suggests that territories are not permanent, perhaps abandoned after nest failure. We find that by estimating population growth, even in short-term studies, testable hypotheses can be generated that will allow better understanding of population dynamics.
17 citations
TL;DR: The present results suggest that the local populations of the endemic Black-cheeked Gnateater were naturally differentiated along the entire original range before the recent process of massive deforestation.
Abstract: Randomly amplified polymorphic DNA (RAPD) markers were used to analyze genetic differentiation among three populations of the endemic Black-cheeked Gnateater (Conopophaga melanops melanops) within a larger pristine reminiscent of the Brazilian Atlantic Forest. Analyses of molecular variance (AMOVA) (fST = 0.13149, P < 0.0001) and the nonparametric test for homogeneity of the molecular variance (HOMOVA) (B = 0.32337; P = 0.0019) showed a statistically significant genetic divergence among the three Black-cheeked Gnateater populations in a continuous transect of 250 km. Some hypothetic explanations for these results are the sedentary nature of the species and the historical isolation of the populations in refuges during the Pleistocene. The present results suggest that the local populations were naturally differentiated along the entire original range before the recent process of massive deforestation.
8 citations
1 Jan 2002
TL;DR: The previously unknown nest and egg of the Ash-throated Gnateater (C. peruviana) is described which differs in bulkiness and habitat from that of the Chestnutcrowned Gnateaters.
Abstract: The gnateaters (Conopophagidae) form a family of eight poorly known Neotropical understory insectivores. Few studies have been conducted on gnateaters, and natural history and nesting biology are largely unknown. The single published report of gnateater nesting biology is from Hilty (1975) who describes the nest and behavior of the Chestnut-crowned Grateater (Conopophaga castaneiceps). Here, we describe the previously unknown nest and egg of the Ash-throated Gnateater (C. peruviana) which differs in bulkiness and habitat from that of the Chestnutcrowned Gnateater.
7 citations
Journal Article•
TL;DR: Nest, eggs and effort partitioning in incubation and rearing by a pair of the Black-cheecked gnateater, Conopophaga melanops, in a Atlantic Rainforest area of Rio de Janeiro, Brazil.
Abstract: Nest, eggs and effort partitioning in incubation and rearing by a pair of the Black-cheecked gnateater, Conopophaga melanops (Passeriformes, Conopophagidae), in a Atlantic Rainforest area of Rio de Janeiro, Brazil.
4 citations
1 Jan 2007
TL;DR: In this article, random amplified polymorphic DNA (RAPD) markers were used to analyze genetic differentiation among three populations of the endemic Black-cheeked Gnateater (Conopophaga melanops melanops) within a larger pristine reminiscent of the Brazilian Atlantic Forest.
Abstract: Randomly amplified polymorphic DNA (RAPD) markers were used to analyze genetic differentiation among three populations of the endemic Black-cheeked Gnateater (Conopophaga melanops melanops) within a larger pristine reminiscent of the Brazilian Atlantic Forest. Analyses of molecular variance (AMOVA) (φ ST = 0.13149, P < 0.0001) and the nonparametric test for homogeneity of the molecular variance (HOMOVA) (B = 0.32337; P = 0.0019) showed a statistically significant genetic divergence among the three Black-cheeked Gnateater populations in a continuous transect of 250 km. Some hypothetic explanations for these results are the sedentary nature of the species and the historical isolation of the populations in refuges during the Pleistocene. The present results suggest that the local populations were naturally differentiated along the entire original range before the recent process of massive deforestation.
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2013 | 1 |
| 2009 | 1 |
| 2007 | 2 |
| 2002 | 1 |