The enigmatic Black Tinamou: Do distribution, climate, and vocalizations reveal more than one species?

Negret, Pablo José; Laverde-R., Oscar

doi:10.1642/auk-14-183.1

Cited by 11 publications

(8 citation statements)

References 9 publications

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“…This is because tinamous are cryptic, shy, and secretive Neotropical birds with mainly crepuscular and nocturnal activity. The vocalizations of tinamous, which are loud and very distinctive, are the only clues usually used to study tinamou ecology (e.g., Lancaster, ; Negret, Garzón, Stevenson, & Laverde‐R, ; Negret & Laverde‐R, ). Therefore, tinamous seem to be an interesting model to monitor applying acoustic approaches.…”

Section: Introductionmentioning

confidence: 99%

Vocal behavior of the Undulated Tinamou (Crypturellus undulatus) over an annual cycle in the Brazilian Pantanal: New ecological information

2019

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Tinamous (Tinamidae) are a group of Neotropical birds for which little information is available. The Undulated Tinamou (Crypturellus undulatus) is one of the most widespread species but also declining. Due to its secretive habits, ecological knowledge regarding the species relies on few anecdotal descriptions. We used automated recorders to monitor the vocal activity of the species over an annual cycle at four sites in the Brazilian Pantanal. We provide a description and analyze the diel and seasonal patterns of the calling activity in this species and provide new ecological information. The daily cycle showed two significant peaks in calling activity during the early morning and late afternoon, in agreement with the vocal behavior common among tinamous. The species was vocally active throughout the year, but it was significantly higher during September-October and March. This suggests that the breeding period of the Undulated Tinamou in the Brazilian Pantanal extends from September to April.After the months with highest calling activity, there was a strong decrease in activity, which might be related to the silent behavior of male tinamous during incubation. The seasonal pattern and breeding period identified for the Undulated Tinamou in the Brazilian Pantanal are in agreement with those observed in previous studies carried out with other Crypturellus species. The use of automated recorders was found to be a useful method for monitoring the calling activity of this secretive group of birds and might be useful in the assessment of future population trends in this and other declining tinamous.Abstract in Portugese is available with online material.

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Section: Introductionmentioning

confidence: 99%

Vocal behavior of the Undulated Tinamou (Crypturellus undulatus) over an annual cycle in the Brazilian Pantanal: New ecological information

2019

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“…On average, C. n. noctivagus of this relictual population are smaller than those of other regions of Brazil, except for the tarsus length (Tomotani & Silveira 2016). Geographic variations in morphology and vocalization patterns are common in forest tinamous species (Laverde-R & Cadena 2014, Negret et al 2015, especially among subspecies of the genera Tinamus and Crypturellus (Schelsky 2004). It is important to highlight that the specimens measured by Tomotani & Silveira (2016) were embalmed; therefore, direct comparisons to living individuals are not appropriate.…”

Section: Discussionmentioning

confidence: 94%

MORPHOMETRY AND SEXUAL DIMORPHISM IN THE YELLOW-LEGGED TINAMOU Crypturellus noctivagus noctivagus IN A RELICTUAL POPULATION FROM SOUTHERN BRAZIL

et al. 2020

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The Yellow-legged Tinamou (Crypturellus noctivagus) is a terrestrial forest bird endemic to Brazil. Females and males of the subspecies Crypturellus noctivagus noctivagus are indistinguishable at the naked eye and there is lack of knowledge regarding means to discriminate sexes in the field. We investigated morphometric differences between sexes of C. n. noctivagus to determine which measures should be used to distinguish sexes. We compared eight morphometric measurements and total body mass of adult birds from a relictual population living in the wild, in the state of Rio Grande do Sul. Birds were captured during the breeding seasons of 2015 and 2016. Sex identification of individuals (four females and seven males) was obtained by molecular analysis. Differences between sexes were tested through Student's t and Mann-Whitney's tests and a through Principal Component Analysis. On average, females were 9.9% heavier and had bills 11.8% longer than males. Males had middle toes 8.7% larger and tails 19.0% larger than females, the latter presenting the highest degree of dimorphism among all measurements. Our results show that, when molecular sexing is not feasible, morphometric variables may be used to determine the sex of C. n. noctivagus individuals.

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“…Environmental, bioclimatic and topographic variables contribute significantly to the delimitation of accurated models of species distribution in the Neotropics (Echarri et al 2009, Hoffmann et al 2015, Negret et al 2015, Sabattini et al 2017). In the case of C. noctivagus, which is considered a forest bird (Magalhães 1994, Tomotani & Silveira 2016, the percent arboreal coverage increment of the model contributed to the delimitation of possible ecological corridors to connect populations across its distribution.…”

Section: Discussionmentioning

confidence: 99%

“…It is likely that other populations exist in these regions but are not completely inventoried, probably due to the lack of ornithological studies. Although the two subspecies of C. noctivagus were subdivided based on subtle differences (Magalhães 1994, Sick 1997, Tomotani & Silveira 2016, tinamid birds may present differences even between populations that are closely related (Cabot 1992, Schelsky 2004, Laverde-R. & Cadena 2014, Negret et al 2015). The predictive model indicated connections between some populations of C. noctivagus in adjacent areas, which comprises regions of Atlantic Forest, Cerrado and Caatinga Biomes.…”

Section: Rsmentioning

confidence: 99%

“…Recent studies regarding tropical birds provided distribution predictions for: Eudromia spp. (Echarri et al 2009), Alectrurus tricolor, Nothura minor, Penelope ochrogaster, Taonis cusnanus (Marini et al 2009), Guarouba guarouba (Laranjeiras et al 2009), Drymophila squamata, D. ferruginea, D. rubricollis, D. genei, D. ochropyga, D. malura (Rajão et al 2010, Polystictus superciliaris (Hoffmann et al 2015) and Tinamus osgoodi (Negret et al 2015). Such studies have delimitated suitable environments for the occurrence of these species, as well as possible ecological corridors that may reflect on both restriction and expansion of the distribution.…”

Section: Introductionmentioning

confidence: 99%

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OCCURRENCE AND PREDICTIVE DISTRIBUTION OF Crypturellus noctivagus (AVES, TINAMIDAE) IN BRAZIL

et al. 2019

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The Yellow-legged Tinamou (Crypturellus noctivagus) is a terrestrial forest bird endemic to Brazil currently threatened with extinction. We aimed to update and predict the potential distribution of the species in Brazil. We thus reviewed an array of scientific publications, field reports and a scitizen science database to compile available data on the occurrence of C. noctivagus in Brazil. We built a predictive distribution model using the MaxEnt algorithm and the variables temperature seasonality, percent arboreal coverage, isothermality, precipitation of driest quarter, precipitation seasonality, precipitation of wettest month and topography. The Yellow-legged Tinamou was found in 114 municipalities belonging to 11 states. The predictive model presented a distribution scenario mostly associated with the Atlantic Forest, although it also suggested the occurrence of suitable areas in the Cerrado and Pampa Biomes. The records show that some, but not all populations of C. noctivagus are currently within protected areas. This study brought together all available knowledge regarding the distribution of C. noctivagus in the wild. Ecological information regarding this group, along with the spatial distribution patterns described here, may be useful tools for the development and implementation of conservation and management actions for the species, in both regional and global scales.

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The enigmatic Black Tinamou: Do distribution, climate, and vocalizations reveal more than one species?

Cited by 11 publications

References 9 publications

Vocal behavior of the Undulated Tinamou (Crypturellus undulatus) over an annual cycle in the Brazilian Pantanal: New ecological information

Vocal behavior of the Undulated Tinamou (Crypturellus undulatus) over an annual cycle in the Brazilian Pantanal: New ecological information

MORPHOMETRY AND SEXUAL DIMORPHISM IN THE YELLOW-LEGGED TINAMOU Crypturellus noctivagus noctivagus IN A RELICTUAL POPULATION FROM SOUTHERN BRAZIL

OCCURRENCE AND PREDICTIVE DISTRIBUTION OF Crypturellus noctivagus (AVES, TINAMIDAE) IN BRAZIL

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