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Density, Habitat Use, and Activity Patterns of a Vulnerable Population of Tinamus Solitarius (Vieillot, 1819) in a Brazilian Atlantic Forest Fragment

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Density, Habitat Use, and Activity Patterns of a Vulnerable Population of Tinamus Solitarius (Vieillot, 1819) in a Brazilian Atlantic Forest Fragment Canadian Journal of Zoology Density, habitat use, and activity patterns of a vulnerable population of Tinamus solitarius (Vieillot, 1819) in a Brazilian Atlantic Forest fragment Journal: Canadian Journal of Zoology Manuscript ID cjz-2017-0153.R1 Manuscript Type: Article Date Submitted by the Author: 05-Sep-2017 Complete List of Authors: Ferreguetti, Átilla; Universidade do Estado do Rio de Janeiro, Ecology Pereira-Ribeiro,Draft Juliane; Universidade do Estado do Rio de Janeiro, Ecology Tomas, Walfrido; Embrapa Pantanal, Wildlife laboratory Bergallo, Helena; Universidade do Estado do Rio de Janeiro, Ecology Rocha, Carlos Frederico; Universidade do Estado do Rio de Janeiro, Ecology Detectability, Distance sampling, Line-transect, Occupancy modelling, Keyword: Reserva Natural Vale, Solitary Tinamou, Tinamus solitarius https://mc06.manuscriptcentral.com/cjz-pubs Page 1 of 29 Canadian Journal of Zoology Density, habitat use, and activity patterns of a vulnerable population of Tinamus solitarius (Vieillot, 1819) in a Brazilian Atlantic Forest fragment 1* 1 2 Átilla Colombo Ferreguetti , Juliane Pereira-Ribeiro , Walfrido Moraes Tomas , Helena Godoy Bergallo 1 and Carlos Frederico Duarte Rocha 1 1 Department of Ecology, Rio de Janeiro State University, Rua São Francisco Xavier, nº 524, PHLC, sala 220. Maracanã, CEP: 20550-019. Rio de Janeiro, RJ, Brazil. Phone: 55(21)23340260. 2 Wildlife Laboratory, Embrapa Pantanal, Rua 21 de Setembro,n° 1.880, Bairro Nossa Senhora de Fátima,CEP:79320-900. Corumbá, Mato Grosso do Sul, Brazil. Draft *Corresponding author: [email protected] 1 https://mc06.manuscriptcentral.com/cjz-pubs Canadian Journal of Zoology Page 2 of 29 Density, habitat use, and activity patterns of a vulnerable population of Tinamus solitarius (Vieillot, 1819) in a Brazilian Atlantic Forest fragment ACF, JPR, WMT, HGB, and CFDR Abstract We present the 1st estimates of density of the Solitary Tinamou (Tinamus solitarius (Vieillot, 1819)) in the Reserva Natural Vale (RNV), one of the two largest remnants of the Atlantic Rainforest in the State of Espírito Santo, Brazil. We also modeled the spatial distribution and habitat use of the species using occupancy and detectability modeling. We used a line-transect survey to estimate density and abundance, and camera-traps to estimate habitat use and activity pattern. We conducted the survey within a 13-month period (April 2013 to May 2014). Estimated density was 9 ± 2 individuals / km 2 and estimated populationDraft size for the entire RNV was 2115 ± 470 individuals. Occupancy was best described by the: distance to forest edge; distance between trees; poaching intensity; and understorey cover. Detectability was affected by the: distance between trees and poaching intensity. We conclude that in the RNV, the near-threatened T. solitarius is a diurnal species preferring intact closed-canopy forest but tending to avoid areas near to forest edges or areas under comparatively high intensity of poaching. These results reinforce the importance of RNV as a source of resource to T. solitarius reproduction at Brazilian Atlantic forest remnants. Key Words: Detectability; Distance sampling; Line-transect; Occupancy modelling; Reserva Natural Vale; Solitary Tinamou; Tinamus solitarius 2 https://mc06.manuscriptcentral.com/cjz-pubs Page 3 of 29 Canadian Journal of Zoology Introduction The Atlantic forest spreading along Brazil, northeastern Argentina, and eastern Paraguay, is one of the world’s top five biodiversity hotspots (Myers et al. 2000) and one of South America’s highest priorities for bird conservation (Stotz et al. 1996; Stattersfield et al. 1998). In Brazil, only about 11% of the original area covered by the Atlantic Forest still remains (Ribeiro et al. 2009). Birds species that occurs in this biome are subject to different threats such as high grade logging (Aleixo 1999), impact of roads (Kuitunen et al. 1998; Develey and Stouffer 2001; Clevenger et al. 2003), poaching (Chiarello 2000; Hill et al. 2003; Nunes et al. 2012), habitat loss and habitat fragmentation (Anjos 2006; Loures-Ribeiro et al. 2011), all of which have led to local extirpations of formerly common speciesDraft such as the Drab-breasted Bamboo-tyrant (Hemitriccus diops (Temminck, 1822)) and the Pheasant Cuckoo (Dromococcyx phasianellus (Spix, 1824)) (Willis 1979; Christiansen and Pitter 1997; Ribon et al. 2003). The Tinamidae family, the only component of the Tinamiformes order, has approximately 50 species, which occur from northwestern Mexico to southern South America (Cabot 1992; Sick 1997). The Solitary Tinamou, Tinamus solitarius (Vieillot, 1819), is the largest tinamid outside the area of the Amazon basin and can reach up to 52 cm in length, with males with mass between 1.2 and 1.5 kg and females between 1.3 and 1.8 kg (Bokermann 1991; Sick 1997). Originally the T. solitarius had a wide distribution, from the state of Pernambuco to the north of Rio Grande do Sul, including Minas Gerais, west of São Paulo, Misiones (Argentina) and regions adjacent to Paraguay (BirdLife International 2016). However, there are few information on the ecology of the T. solitarius . Excepting the study of Kuhnen et al. (2013), information 3 https://mc06.manuscriptcentral.com/cjz-pubs Canadian Journal of Zoology Page 4 of 29 available on the species are restricted to anecdotal data found in bird guides and in handbooks, with only few studies concerning aspects of its ecology ( e. g. Bokermann 1991; Sick 1997; Brooks et al. 2004; Schelsky 2004; Sigrist 2009). Tinamus solitarius is considered as a Near Threatened species according to the IUCN Red List of Threatened Species, but the T. solitarius populations could be a threshold for classification as Vulnerable because a moderately rapid and on-going population decline is suspected (BirdLife International 2016). Tinamus solitarius currently survives in few forest fragments mostly due to poaching and habitat loss impacts (Dinerstein et al. 1995), and has been the subject of reintroduction projects in the wild, such as those in the state of Minas Gerais (Bokermann 1991; Sick 1997; BirdLife International 2016). Tinamus solitarius is mostly found in lowland humid forest up to 1,200 m, preferring intactDraft closed-canopy forest with little undergrowth (Cabot et al. 1992; Parker et al. 1996). It is supposedly susceptible to forest fragmentation, but there is Paraguayan population surviving in a small area of degraded forest, and the species has also been seen regularly in secondary forest in one site in Argentina (Cabot et al . 1992; Chebez 1996; Lowen et al.1996). According to BirdLife International (2016) the population status of the species in its geographical distribution remains a gap, and Stotz et al. (1996) described this species as 'uncommon'. To provides additional tools for the conservation of T. solitarius , our study presents the 1st estimates of density of the species in the Reserva Natural Vale, one of the two largest remnants of the Atlantic Rainforest in the State o Espírito Santo, located in Brazil. By using occupancy and detectability modeling, we could model the spatial distribution and habitat use of the species, from which we predicted the direction of response of six covariates based on prior knowledge of T. solitarius ecology (Bokerman 1991; Cabot et al. 1992; Lowen et al. 1996; Sick 1997). We tested the hypothesis that 4 https://mc06.manuscriptcentral.com/cjz-pubs Page 5 of 29 Canadian Journal of Zoology occupancy probability would be higher in sites with primary forest cover. We also hypothesized that detectability would be higher in sites with lower influence of poaching and greater distance from forest edges. Material and Methods Study area. --- This study was conducted in the Reserva Natural Vale (RNV), a protected area of 23,500 ha belonging to the Vale Company. The Reserve is in the neighboring municipalities of Linhares and Jaguaré (19°06’–19°18’ S and 39°45’– 40°19’ W), in northeastern Espírito Santo, Brazil (Fig. 1). The RNV was established through a gradual process of land acquisition, which started in 1955, when Vale bought its 1 st properties in the region, and reached its current limits in 1973. The Reserve is composedDraft of one main block of forest (approximately 98% of the total area), and a much smaller fragment, known as Biribas Reserve, in the southwest of the main block. The RNV is inserted within the Atlantic Rainforest biome, and composed of a mosaic of habitats with four main vegetation types (adapted from Jesus 1987; Kierulff et al. 2014): coastal plain, riparian, and sandy soil forests, and natural grassland. The evergreen coastal plain forest has two or more upper strata and high densities of lianas and epiphytes, and covers approximately 68% of the total area of the reserve. The riparian forest, which covers some 4% of the Reserve, is a mixed type of vegetation associated with streams, characterized by widely-spaced trees and a predominance of palms. The sandy soil forest (covering approximately 8% of the RNV) is a type of woody vegetation on sandy soils, physiognomically similar to the coastal plain forest at an early or intermediate stage of regeneration. The natural grasslands occur as enclaves within the forest, which were once the sites of ponds in the geological past, and cover 5 https://mc06.manuscriptcentral.com/cjz-pubs Canadian Journal of Zoology Page 6 of 29 ca. 6% of the area of the reserve. In addition to these vegetation types, approximately 8% of the reserve is covered by wetlands (swamps) and streams (Fig. 1). The remaining 6% is composed of administrative structures of the Reserve. Line-transect surveys.--- To estimate density and abundance of T. solitarius , we established 4 5-km long line transects in the RNV (Buckland et al. 2001), using the RAPELD protocol (Magnusson et al. 2005). RAPELD is a technique that seeks to standardize the collection of biological data and aims to develop methods for long-term ecological research (PELD) and allow rapid inventories (RAP - Rapid Assessment Program). Transects were separated from one to another by a minimum of 4 km of distance.
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