POPULATION DENSITY OF Crypturellus noctivagus noctivagus (AVES, TINAMIDAE) IN THE PAMPA BIOME, SOUTHERN BRAZIL

Abstract

Crypturellus noctivagus noctivagus is a forest bird endemic to Brazil. In the state of Rio Grande do Sul, the species is considered Critically Endangered, and is known for one relictual population in Pampa Biome. In this study, we estimated the population density of this relictual population using the Distance Sampling method. Samplings occurred from September to February, thus comprising three reproductive periods of the species (2012 to 2017). In total, 58 contacts were recorded with C. n. noctivagus individuals in the three reproductive periods. In each reproductive period 81.600 m were covered in trails. We found a density of 0.04 individuals/km², with an average probability of 18 adult individuals. Our results represent the first efforts for density estimation of this relictual population of C. n. noctivagus, which we suggest is composed by the last individuals in the state of Rio Grande do Sul, highlighting the need of local conservation.

NEW RECORD AND EGG PREDATION OF Crypturellus notivagus (AVES, TINAMIDAE) IN THE STATE OF RIO GRANDE DO SUL, BRAZIL

“…Although some information on C. noctivagus from RS has already been reported in the recent literature (Corrêa et al 2010, Corrêa & Petry 2018, 2020a, 2020b, this work unveils a second population in the state and the record of a nest of C. noctivagus with 10 eggs which is considered unusual for this species, according to information available in Berlepsch andIhering (1885), Sick (1997), Bencke et al (2003) and Cabot (2020). This new population provides an opportunity for further research and conservation programs of this species in the state, with particular focus on the genetic diversity in Bird nests on the ground are more exposed to predators (Sick 1997), and predation of tinamid nests occurs mostly during the night (Brennan 2010).…”

“…More than three decades later, a relictual population was rediscovered for the RS in an isolated forest fragment within the Pampa biome in the municipality of São Sepé (Corrêa et al 2010). This population was estimated at about 18 adult individuals (Corrêa et al 2020a), which were believed to be the only living individual in RS (Corrêa et al 2010(Corrêa et al , 2020a. Due to the fragmentation of its natural habitats (Bencke et al 2003) and the existence of isolated populations of C. noctivagus , monitoring the breeding biology and success of this species is important for conservation purposes (Corrêa et al 2010(Corrêa et al , 2020a.…”