Biologia reprodutiva e uso de habitat por Cantorchilus Leucotis (Lafresnaye, 1845) (aves, Troglodytidae) no Pantanal, Mato Grosso, Brasil

Nóbrega, Paula Fernanda Albonette de; Pinho, João Batista de

doi:10.1590/s0031-10492010003100001

Cited by 8 publications

(4 citation statements)

References 20 publications

(21 reference statements)

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“…recorded here for C. roberti (40.9%) was nevertheless much higher than those found in C. melanops byLima & Roper (2009), who registered a success rate of 22%, andStuder et al (2019), who recorded a rate of 20%. Depredation and abandoning the nest are two of the principal factors that determine the low clutch success rates in most bird species from the Neotropical region(Marini et al 2009, Nóbrega & Pinho 2010. In the present study period, in fact, all the nests were lost during one of the breeding seasons monitored, which had a major impact on the overall production of fledglings.…”

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confidence: 68%

Breeding biology of Hooded Gnateater Conopophaga roberti Hellmayr, 1905 (Aves: Conopophagidae)

2022

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The Hooded Gnateater Conopophaga roberti Hellmayr, 1905 is an insectivorous understory passeriform with discrete behavior, whose reproductive attributes are poorly-known. In the present study, we describe the reproductive biology of the species and the growth pattern of the nestlings, based on observations conducted in remnants of the Cerrado savanna in eastern Maranhão state, in Brazil. The nests were identified during active searches conducted between June, 2018 and March, 2021. A total of 22 nests were found over the course of three breeding seasons. The cup-shaped nests were supported by small branches and were constructed at a mean height of 40.6 ± 16.1 cm (N = 21) above the ground. The nests were 23.1 ± 3.9 cm in length and 14.1 ± 1.6 cm in width (N = 21). The eggs were beige in color, with irregular brown mottling only at the rounded end of the egg, which had a mean length of 21.3 ± 0.8 mm, width of 17.2 ± 0.8 mm, and mass of 3.1 ± 0.1 g (N = 23). Hatchlings are completely naked and weigh 3.1 ± 0.2 g (N = 7), and when they abandon the nest, they have yet to reach full adult size, with the total length being 65.4% of that of the adult, the wing, 65.4%, the head, 73.9%, the culmen, 74.2%, the body mass, 73.3%, and the tarsus, 89.0% that of the adult. The growth curves are sigmoidal and all the coefficients of determination are at least 0.96, with the body length having the highest value (R2 = 0.98). During the breeding season, the adult pair emitted alarm calls constantly when observers were in the vicinity of the nest. On a number of occasions, members of the breeding pair were observed moving away from the nest as it was approached by observers, while engaging in broken-wing display. The nest architecture, the color of the eggs, and the behaviors presented by this gnateater were similar to those described for other Conopophaga. With this work we contributed to improve the knowledge on the breeding behavior of this poorly know group of understory insectivorous birds.

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confidence: 68%

Breeding biology of Hooded Gnateater Conopophaga roberti Hellmayr, 1905 (Aves: Conopophagidae)

2022

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“…In the Pantanal, P. dumicola, the nuclear species, was present in flocks even when breeding outside and during the rainy season (de Pinho and Marini 2014; G. Fernández-Arellano, personal observation). The breeding period of songbirds in the Pantanal encompasses both the dry and rainy seasons (de Pinho and Marini 2014), but breeding reaches its peak during the first rains (de Pinho et al 2006, Rubio and de Pinho 2008, de Nóbrega and de Pinho 2010, Bernardon et al 2014) when flock complexity is reduced in relation to the dry and flood seasons. However, the participation in flocks during the rainy season suggests that species still derive some benefits (e.g., lower interspecific competition for food resources).…”

Section: Discussionmentioning

confidence: 99%

Seasonal drivers of mixed-species flocks from tropical savannas: insights from the Pantanal wetland

Fernández-Arellano¹,

Bonanomi²,

Pinho³

2023

JFO

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Birds participate in different types of multi-species groups (e.g., mixed-species flocks) occurring from temperate to tropical forest and also savannas. However, the effects of seasonal variation in flocking dynamics and formation in tropical savannas, especially in seasonally flooded wetlands, have received comparatively less attention than tropical forests and temperate ecosystems. Because multi-species groups can reflect specific aspects of the bird community (e.g., temporal dynamics), the present study aims to describe the structure, organization, and seasonal variation of mixed-species flocks in the Pantanal, the world's largest tropical wetland. During the dry, flood, and rainy seasons of 2019 and the flood season of 2020, we observed flocks within the natural mosaic of grassy-shrubby vegetation and patchy forest, and recorded the number of species, individuals (per species), and diversity. Seasonality had a strong influence on flocking structure and organization. During the rainy season, flocks had significantly fewer species, individuals, and diversity, whereas during the dry and flood seasons, flocks had more species, individuals, and diversity. Moreover, we suggest Polioptila dumicola and Casiornis rufus to act, respectively, as the nuclear and the sentinel species of flocks. These species were present in flocks during the year, but they were less frequent during the rainy season. The breeding period during the rainy season may negatively influence the formation of mixed-species flocks, whereas the access to food resources and predator protection may instead facilitate their formation in the dry and flood seasons, respectively. Our results help fill a knowledge gap on how mutualistic interactions among bird species are organized and vary in seasonal and heterogeneous environments, and also provide a starting point to subsequently understand the species role and the effects of human-induced environmental changes on mixed-species bird flock dynamics in the Pantanal and other world's savannas and wetlands facing rapid landscape conversion. los humanos en la dinámica de las bandadas mixtas de especies en el Pantanal y otras sabanas y humedales del mundo con altas tasas de transformación del paisaje.

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“…Flood pulse is an important process contributing to the biodiversity of the Pantanal (Junk et al 1989;Junk and Da Silva 1996), and understanding this process can support bird ecology and conservation studies, which were the most common approaches to research. For example, studies considered hydrological factors to be a driver for the reproduction, habitat use, and migration of bird species (Pinho et al 2009;Nóbrega and Pinho 2010;Donatelli et al 2014;Schuchmann et al 2018).…”

Section: Discussionmentioning

confidence: 99%

Main trends and gaps in studies for bird conservation in the Pantanal wetland

Frota¹,

Vitorino²,

Nunes³

et al. 2020

NBC

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Birds are considered one of the most well-known groups of animals in the Pantanal, playing an important ecological role in wetland ecosystems. Our aim was to identify the main themes and gaps in current knowledge of these birds, considering thirty years of scientific research to direct future studies. We performed a scientometric analysis based on five platforms with the search words “Aves” and “Pantanal” as well as “Bird” and “Pantanal”. We identified 145 scientific studies, with themes of ecology (64), conservation (23), health (17), fauna (15), genetics (12), geographic distribution (7), and environmental education (7). The number of publications has increased significantly over the years. However, the focus is predominantly on certain Pantanal regions, such as the municipalities of Corumbá in Mato Grosso do Sul state and Poconé in Mato Grosso state. Anodorhynchus hyacinthinus and Mycteria americana are among the species with the largest number of studies in the Pantanal, with 12 and 11 papers, respectively. We highlighted the need for new studies in regions such as the north-west and themes such as threatened species and ecosystem services. Integrated knowledge and interdisciplinary approaches can be useful in strategic decision-making and more effective for bird conservation in wetlands.

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Biologia reprodutiva e uso de habitat por Cantorchilus Leucotis (Lafresnaye, 1845) (aves, Troglodytidae) no Pantanal, Mato Grosso, Brasil

Cited by 8 publications

References 20 publications

Breeding biology of Hooded Gnateater Conopophaga roberti Hellmayr, 1905 (Aves: Conopophagidae)

Breeding biology of Hooded Gnateater Conopophaga roberti Hellmayr, 1905 (Aves: Conopophagidae)

Seasonal drivers of mixed-species flocks from tropical savannas: insights from the Pantanal wetland

Main trends and gaps in studies for bird conservation in the Pantanal wetland

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