Tayassu Research Articles

Connectivity at risk: a critical scenario for the endangered Baird’s tapir and the vulnerable white-lipped peccary in the Maya Forest

Connectivity at risk: a critical scenario for the endangered Baird’s tapir and the vulnerable white-lipped peccary in the Maya Forest

Factors influencing wildmeat trade in Guyana and expected changes in the context of the oil-related development prospects

The recent offshore oil discovery in the Guiana Shield is expected to bring about significant changes to the area, such as increased GDP per capita, infrastructure development, and urbanization. The potential impact on the wild meat trade depends on factors influencing its demand and provision. Through interviews and group discussions with trade chain stakeholders in all towns of Guyana, we evaluate wildmeat trade sector and explored predicted changes on it in 2033 with the prospects for short term oil-related development. The most traded species in Guyana included paca, white-lipped peccary, deer, tapir and capybara and a total of 38.46 % (5 out of 13) of the taxa being traded is classified as threatened of extinction. Regions with higher population size and GDP per capita, are the main trade hubs for wildmeat. Access to improved preservation methods (e.g. freezers) and motorized transportation options (eg.: boat with engines and vehicles) significantly influence higher volumes of wildmeat traded. The economic growth anticipated in Guyana is expected to boost population growth and, by the same time, wildmeat demand in urban areas. Concomitantly, with improved infrastructure and increased access to electricity, wildmeat provision will be facilitated across a wider catchment area. Based on the assumption that cultural patterns shaping wildmeat demand and environmental regulations will likely not change at the same rapid path as economic growth in the next ten years, we predict wildmeat trade volumes to increase to 10,280 tons/year by 2033. We identify three main opportunities to ensure a sustainable wildmeat sector in the context of the economic boom: First, the sector requires to be well regulated through a licensing and a quota system that can be adequately enforced. Second, efforts to curve demand on the Coast need to be strengthened based on well designed and culturally adapted behaviour change campaigns. Third, local communities and indigenous people need to be empowered to protect and conserve their territories and wildlife resources, in particular with the authority to exclude illegal hunters.

A Survey of Hepatitis B Virus and Hepatitis E Virus at the Human-Wildlife Interface in the Peruvian Amazon.

Hepatitis B virus (HBV) and Hepatitis E virus (HEV) are zoonotic pathogens posing significant health concerns in rural Amazonia, a region marked by high endemicity, poverty, and limited healthcare access. However, the epidemiology of HBV and HEV in this ecosystem remains underexplored. This study examines the circulation of HBV and HEV at the human-wildlife interface and identifies risk factors within an isolated Amazonian indigenous community reliant on hunting for subsistence. Antibodies against HBV core antigens (HBcAbs) were found in three wildlife species: Cuniculus paca (0.8%), Tayassu pecari (1.6%), and Mazama americana (4.1%), marking the first record of HBV antibodies in free-ranging wildlife in the Amazon. However, further research is necessary to identify circulating strains and their relation to human HBV. HBcAbs were also detected in 9.1% of human samples, confirming exposure to HBV in the region. HEV IgG antibodies were present in 17.1% of humans and were associated with higher age. All wildlife and domestic animal samples tested negative for HEV, but transmission through consumption of wild animals and contaminated water needs further investigation. The identified risk factors highlight the urgent need for measures to promote safer food handling, improved sanitation, hygiene, and practices related to contact with wild animals.

Edge chipping patterns in posterior teeth of hominins and apes

Chip scars in fossil teeth are a lasting evidence that bears on human evolution. Chip dimensions in posterior teeth of hominins, apes and white-lipped peccary (Tayassu pecari) are measured from published occlusal images. The results are plotted as D/Dm vs. h/Dm, where h, D and Dm denote indent distance, chip width and mean tooth crown diameter. The hominin species follow a similar pattern where D/Dm monotonically increases up to h/Dm ≈ 0.3. The behavior for the apes is characterized by two phases. In the first, h/Dm monotonically increases up to h/Dm ≈ 0.26 while in the second (h/Dm ≈ 0.26 to 0.42), D/Dm experiences a drastic change in behavior. The interpretation of chip morphology is assisted by results from controlled spherical indentation tests on extracted human molars. This study shows that in addition to the commonly recognized chipping due to cusp loading, a chip may also initiate from the inner wall of the tooth's central fossa. Accordingly, it is suggested that the chipping in hominins generally initiates from a (worn) cusp while that in apes involves cusp loading up to h/Dm ≈ 0.26 and fossa loading thereafter. The behavior for T. pecari is much similar to that of the apes. The fossa chipping is facilitated by a consumption of hard, large-size diet (e.g., plants, roots, barks and nuts) and presence of broad central fossa, conditions that are met in apes. Finally, a simple expression for the critical chipping force Pch due to fossa loading is developed.

Prevalence, antimicrobial resistance and detection of virulence genes of Escherichia coli and Salmonella spp. isolated from white-lipped peccaries and collared peccaries.

Salmonella spp. and Escherichia coli are implicated in human and animal infections and require antimicrobial treatment in many situations. Faecal samples of healthy white-lipped peccaries (Pecari tajacu) (n = 30) and collared peccaries (Tayassu pecari ) (n = 60) obtained in three farms located in the Midwest Brazil. The antimicrobial profiles of commensal E. coli from P. tajacu and T. pecari from commercial herds in Brazil were isolated and analyzed and virulence genes were detected. Among 90 healthy animals, no Salmonella spp. were isolated. However, 30 samples (27%) tested positive for E. coli, with 18 isolates from P. tajacu and 12 from T. pecari, representing frequencies of 58.0% and 38.7%, respectively. Additionally, other Enterobacteriaceae family bacteria were detected but not included in this analysis. However, individual samples from 30 animals tested positive for E. coli, of which 16 were isolated from P. tajacu presenting multidrug resistance and six were isolated from T. pecari presenting a similar pattern. The E. coli virulence genes detected were papC (pilus-associated pyelonephritis) in five isolates, tsh (temperature-sensitive hemagglutinin) in one isolate, and eae (enteric attachment and effacement) in one isolate. The serum resistance gene, iss (increased serum survival), was detected in four isolates. An association between these genes and the presence of hemolysin was also observed in one isolate. Thus, T. pecari and P. tajacu are potential reservoirs of pathogenic and multidrug-resistant and E. coli. Faecal E. coli of healthy P. tajacu and T. pecari could act as a possible reservoir of antimicrobial resistance genes in environment.

ESTIMATION POPULATION SIZE PECCARIES (TAYASSU PECARI), IN THE “RIO NEGRO” FARM - BRASILIAN PANTANAL, DURING 2003 - 2004, BY MEANS CAPTURE AND RECAPTURE MULTIPLE METHOD

The Tayassu pecari are predominantly distributed in conserved biomes and the maintenance of the species is very susceptible to human activity. In this context, it is important the search for methods of population estimation as well as apply robust methods that allow more accurate estimative. Therefore, this work aims to estimate the population of peccaries, on the Rio Negro farm (Aquidauana-MS) through the multiple captures and recapture method during the years 2003 and 2004, considering the assumption that the population is closed. The estimate of the population size was obtained by the computational resampling and three procedures are compared. It was verified the marked difference between males and females for both years. The population size it was estimated in 134 and 192, however, by means the bootstrap method, a notable change in the distribution pattern of estimates was verified, being positively asymmetric and symmetric, for 2003 and 2004 respectively.

Habitat connectivity of threatened ungulate species in a native savanna landscape of northern South America

AbstractThe native savanna ecosystem of the Orinoquia region is the habitat of 50% of the wild ungulate species reported for Colombia. Over the last 20 years, this high species diversity has been strongly threatened by the human transformation of the natural land cover causing connectivity loss of the habitats. The Orinoquia region lacks a biological connectivity analysis with a multi-species approach involving species groups that are representative of the savanna ecosystem such as the ungulates. Understanding the spatial distributions of suitable areas and the main habitats that act as primary habitats for ungulate species in these landscapes is fundamental for the design of conservation strategies. We use an occurrence dataset for lowland tapir (Tapirus terrestris), white-tailed deer (Odocoileus virginianus), and white-lipped peccary (Tayassu pecari) in the development of species’ potential distribution models, binarization process, and morphological spatial pattern analysis. This information was used for the modeling of dispersal corridors connecting the core habitats of the ungulate focal species using the randomized shortest path algorithm and quantifying the weighted global connectivity metrics. Our results suggest an integral corridor with potential least-cost dispersal routes between the native savanna landscape on the middle basins of the savanna rivers and the Meta River. These areas associated with the fluvial dendritic systems are connected, while the core habitats in the eastern part of the savanna landscape are disconnected. We discuss how the application of such knowledge on the spatial ecology of ungulate focal species might improve the management of the metapopulations in the Orinoquia region.

Native peccaries activity patterns and temporal overlap with wild boar in the southern Brazilian Atlantic Forest

ABSTRACT We analyzed long-term camera-trap data from Protected Areas in the Brazilian Atlantic Forest to study activity patterns of coexisting peccary species (Tayassu pecari and Dicotyles tajacu) and the exotic wild boar (Sus scrofa). The highest pattern overlap was between D. tajacu and S. scrofa (Δ1 = 0.78), followed by T. pecari and S. scrofa (Δ1 = 0.64), and the lowest between D. tajacu and T. pecari (Δ1 = 0.61). In the presence of feral pigs, collared peccary activity exhibited two distinct peaks, occurring in the late evening and early morning. When coexisting with white-lipped peccaries, their activity peaks early in the evening and again in the mid-morning, potentially enabling them to avoid overlapping with the activity peaks of white-lipped peccaries, which are distributed throughout the day. Our findings suggest a potential interference of wild boars in the temporal niche dynamics of native peccaries across various areas within the Brazilian Atlantic Forest biome. Nonetheless, we emphasize the imperative for more focused investigations at both regional micro and macro scales throughout the Atlantic Forest, specifically delving into other dimensions of the niche, such as food and habitat utilization among the three species.

Community-based monitoring reveals low anthropogenic pressure on a game vertebrate population in a sustainable-use Amazonian protected area

SummaryBiodiversity systematic monitoring programmes have been expanding across the globe, especially in protected areas (PAs). Amongst sustainable-use PAs, medium- to large-sized mammals and birds comprise crucial groups to monitor, given their importance to forest functionality and subsistence for local residents. Here, we used 6 years of community-based monitoring data from a sustainable-use PA in the Brazilian Amazonia (Tapajós–Arapiuns Extractive Reserve) to examine the influence of anthropogenic stressors and time on the density and biomass of forest mammal and bird game species. We further assessed trends in population density of target groups over the period. A total of 1915 km of line-transect surveys were completed by trained local monitors along eight established transects, providing data from 12 medium-sized and five large-sized game genera. Generalized linear mixed models of all medium-sized species, all large species and four individual taxa (Tinamidae, Dasyproctidae, primates and Cervidae) showed that some species (e.g., Dasyprocta croconota) exhibited great density, whereas others (e.g., Tapirus terrestris and Tayassu pecari) were rarely detected. Anthropogenic variables did not affect the density and biomass of the overall medium-sized and large vertebrates. Dasyproctidae, Tinamidae and primates were the only taxa influenced by anthropogenic stressors, with negative influence occurring only for Tinamidae. Moreover, density of groups and taxa remained stable throughout the period in the Reserve, although the frequency of some species may indicate past population losses. Continuation of this monitoring programme is required to improve understanding of population fluctuations, but over the 6 years studied, game population density and biomass were not linked to anthropogenic stressors.

Identification of mammals based on hair microstructure: Methodological adaptations and new morphological patterns

The characterization of patterns of hair microstructure is an important instrument for studying the diet and ecology of mammals, representing an accessible method for identifying predators and their prey. The present study aimed to: (1) describe methodological adaptations developed to optimize traditional guard hair analysis protocols; (2) propose adjustments in the classification of morphological patterns of medulla and cuticle; and (3) establish the microstructural pattern of Brazilian mammals’ hair to assist in the identification of prey and predators in studies based on fecal samples. Hairs from 53 mammal species, including small (n = 16), medium (n = 28) and large size (n = 9), distributed in 24 families and nine orders were analyzed. The orders with the most species analyzed were Carnivora (n = 14), Rodentia (n = 13) and Didelphimorphia (n = 8), while the most representative families were Didelphidae (n = 8), Cricetidae (n = 7) and Felidae (n = 6). Among the species, 13 (24.5% of the total) did not have the microstructural patterns described in studies developed previously in Brazilian territory: Alouatta guariba, Blarinomys breviceps, Bradypus torquatus, Callicebus personatus, Callithrix geoffroyi, Dasyprocta leporina, Hylaeamys seuanezi, Potos flavus, Priodontes maximus, Rhipidomys mastacalis, Sapajus robustus, Sylvilagus minensis and Tayassu pecari. More descriptive nomenclatures were proposed regarding the observed patterns and new patterns were described for species evaluated in previous studies. Our results contribute to the diagnosis of species to be more accurate, contributing to the development of future studies.

Urgent Prioritization of Conservation Sites for the Jagüilla (Tayassu pecari) in the Honduran Moskitia Region

Tayassu pecari (known in Honduras as jagüilla and Wari in Miskito), is one of two types of wild pigs (chanchos de monte) found in Honduras (Marineros and Martinez 1998). Currently, its conservation status on the IUCN red list is vulnerable (VU) and critically endangered (CR) for Honduras (WCS 2021). According to Portillo and Elvir (2016), the potential area for jagüilla distribution is 6,126 km2 corresponding to 5.5 % of the country territory. The potential area for this species is in three sites, mainly protected area of the Reserva del Hombre and the Biósfera del Río Plátano (RHBRP), with approximately 70 % of the predicted potential distribution (4,288 km2), 20 % (1,225 km2) in the indigenous territories of Rus Rus, Mocorón and Warunta, and 10 % (613 km2) in the Tawahka Asagni Biosphere Reserve. The aim of this note is to contribute to the prioritization of four sites where evidence of small groups of jagüillas have been found: 1) Sierra de Agalta National Park. 2) the core zone of the RHBRP. 3) the cultural zone of the RHBRP. 4) the Warunta Mountains. Records of jagüilla were obtained from diverse sources (Table 1), mainly from biological monitoring implemented in various locations of the Río Plátano Biosphere (buffer zone, cultural zone, and core zone), Warunta Mountains, riparian forest in Rus Rus River, as well as the Tawahka Biosphere Reserve through the use of camera traps which were carried out between 2016 and 2022. In the RHBRP jagüilla were registered in two of the three zones these being the core zone and the cultural zone; no records of the species were obtained in the buffer zone. In these localities, groups of 2 to 45 individuals were documented. For the Warunta region in the Indigenous Federation of Mocoron and Segovia Zone (FINZMOS territory), tracks, and photographic evidence of a large group of 50 to 100 individuals were registered moving in this territory covered mainly by primary broadleaf forest. Hunting by invasive settlers and habitat loss due to deforestation in protected areas, has had an impact on jagüilla populations, reducing this species in the Honduran Moskitia region as mentioned by Portillo and Elvir (2016). One of the important aspects of this work is to highlight the findings in NP Sierra de Agalta as a potential site for future research and biological monitoring efforts for the development of conservation processes for the jagüilla as a park conservation target (Figure 2) since the last records of this species were documented at La Quebrada del Sol, NP Sierra de Agalta, in 1994 (Marineros and Martínez 1998). It is of utmost importance to establish monitoring and participatory conservation processes with the local communities (Larsen 2019; Martínez et al. 2022).

Phylogenetic congruence of Plasmodium spp. and wild ungulate hosts in the Peruvian Amazon

Malaria parasites are known to infect a variety of vertebrate hosts, including ungulates. However, ungulates of Amazonia have not been investigated. We report for the first time, the presence of parasite lineages closely related to Plasmodium odocoilei clade 1 and clade 2 in free-ranging South American red-brocket deer (Mazama americana; 44.4%, 4/9) and gray-brocket deer (Mazama nemorivaga; 50.0%, 1/2). We performed PCR-based analysis of blood samples from 47 ungulates of five different species collected during subsistence hunting by an indigenous community in the Peruvian Amazon. We detected Plasmodium malariae/brasilianum lineage in a sample from red-brocket deer. However, no parasite DNA was detected in collared peccary (Pecari tajacu; 0.0%, 0/10), white-lipped peccary (Tayassu pecari; 0.0%, 0/15), and tapir (Tapirus terrestris; 0.0%, 0/11). Concordant phylogenetic analyses suggested a possible co-evolutionary relationship between the Plasmodium lineages found in American deer and their hosts.

Agroindustrial landscapes and white-lipped peccary habitat use in the Cerrado of Brazil

The conversion of natural areas into agricultural land has increased human-wildlife interactions, often resulting in crop damage. This study focuses on the white-lipped peccary (Tayassu pecari), which thrives in landscapes where well-preserved, naturally-vegetated public and private lands are juxtaposed with agricultural fields. We investigated the habitat use and selection of four herds of white-lipped peccaries in a landscape mosaic along the southern border of Emas National Park in the Cerrado biome of Brazil. Our findings reveal that white-lipped peccaries prefer both corn plantations and gallery forests as habitats. Through high-frequency GPS telemetry, we observed a strong tendency to turn when herds were in agricultural areas and gallery forests, indicating feeding behavior. On the other hand, they typically move in straight lines for long distances when traversing bare soil fields and native Cerrado vegetation, suggesting they are merely passing through these habitats. The extensive feeding on corn crops in agricultural fields has resulted in significant financial losses for producers, leading to a conflict between white-lipped peccaries and landowners. Understanding the movement dynamics of the species and their intensive use of both private and public lands can aid in the development of management strategies that minimize or eliminate crop losses while ensuring the survival of this vulnerable species in landscapes comprising agricultural fields and native habitats.

New records of White-lipped Peccaries in altered landscapes of the Brazilian Midwest

New records of White-lipped Peccaries in altered landscapes of the Brazilian Midwest

Non-volant mammals of the Serra da Fortaleza Wildlife Refuge, southern Goiás, central Brazil

Protected areas are essential for the maintenance of biodiversity, but we know little about local biodiversity in these areas. In this study, we describe the composition and structure of the non-volant mammal community in the Serra da Fortaleza Wildlife Refuge in southern Goiás state, central Brazil. We distributed 20 hexagons (~57 ha each), 10 in the protected area and 10 in its surroundings. We collected data on composition, richness, and abundance of non-volant mammals using live and pitfall traps, camera traps, and active searching. We recorded 39 species (five threatened) of non-volant mammals. The use of diverse sampling methods allowed for a com-prehensive depiction of mammal diversity and composition, lead to the discovery of new species records for the region, including Marmosa limae Thomas, 1920, Cerradomys scotti (Langguth & Bonvicino, 2002), Hylaeamys megacephalus (G. Fischer, 1814), and Tayassu pecari (Link, 1795). We emphasize the importance of protected areas for the conservation of the mammal fauna in the highly fragmented landscape of central Brazil.

Ranging ecology and resource selection of white-lipped peccaries (Tayassu pecari) in the world's largest tropical agricultural frontier.

Agricultural commodity production is one the main drivers of deforestation in Legal Brazilian Amazonia resulting in a deforested and/or fragmented landscape formed by forest remnants of different sizes and shape embedded within the agricultural matrix. As an ecosystem engineer and a crucial seed predator, white-lipped peccaries (Tayassu pecari) play a pivotal role in forest structure, biodiversity, and nutrient cycling. However, they are highly sensitive to habitat fragmentation and hunting pressure. White-lipped peccaries are, therefore, a wide-ranging "landscape species," the spatial and ecological requirements of which can be used to guide conservation planning in human-modified landscapes. Using data from GPS-tracked individuals in large-scale mechanized agriculture landscapes in the state of Mato Grosso, Brazil's largest soybean and maize producer, we investiated the home range size and resource selection during both the crop and non-crop season. We observed a seasonal variation in home range size and an increased selection for croplands during the crop season. White-lipped peccaries favored native vegetation patches and also exhibited avoidance of locations distant from perennial water bodies and distant cropland locations far from forest remmants. This study can contribute to inform effective conservation strategies and land management practices aimed at preserving suitable habitats and promoting wildlife coexistence with working agricultural landscapes.

Brasiliochoerus stenocephalus (Lund in Reinhardt, 1880), a large extinct peccary in late Pleistocene beds of Uruguay: Comparative, isotopic and paleoecological studies

Tayassuids entered South America, forming part of the Great American Biotic Interchange, and have had success in South America since the Pliocene, evolving into six genera, and several species have been described. The extinct peccary Brasiliochoerus stenocephalus in late Pleistocene beds of northern Uruguay (the Sopas Formation) is substantiated based on an almost complete and well-preserved skull. A set of associated diagnostic features supports a confident assignment of the material to this extinct species. This peccary was present in the last 40 ka in this area. It was unearthed together with Tayassu pecari, which is found in the same beds, indicating the co-occurrence of both taxa. According to a quantitative analysis, B. stenocephalus is characterized by having a skull much larger than those of T. pecari and Dicotyles tajacu and equal to or larger than the largest individuals of Parachoerus wagneri. However, if only dental variables are computed, despite having a large skull, it shares the morphospace with T. pecari, with P. wagneri being the species with the largest teeth. A high consumption of C3 plants is suggested by δ13C results, and the same kind of browser diet could be roughly inferred for B. stenocephalus and T. pecari. Considering δ18O and δ13C together, both specimens seem to have eaten mostly in the canopy frugivore range, including leaves and some floor plants. T. pecari seems to have not significantly varied its feeding behavior, at least between ca. 40 ka and today. The isotopic results support a browser semiopen woodland lifestyle in C3–C4 grassland to open-canopy environments reinforced by accompanying fauna.

Nearctic Pleistocene ungulates from the Pampean region (Argentina) in the historical collections of Santiago Roth in Switzerland: an overview

Nearctic ungulates such as artiodactyls, perissodactyls, and proboscideans arrived in South America during the Great American Biotic Interchange. Among them are camelids, cervids, tayassuids, equids, tapirids and gomphotherids. A historical collection of Nearctic ungulates from Pleistocene deposits of the Pampean region in Argentina is here studied and described. The collection consists of specimens collected by Santiago Roth in the nineteenth century and brought to Europe, where they are housed in the paleontological collections of the University of Zurich and the Natural History Museum of Geneva. Among the taxa reported here are Notiomastodon platensis,Lama guanicoe, Hemiauchenia paradoxa, Tayassu pecari, Morenelaphus sp., Hippidion cf. H. principale, Equus cf. E. neogeus, and other indeterminate gomphotherids, camelids, tayassuids, cervids, and equids. The exact stratigraphic position of these fossils collected more than 130 years ago is in many cases uncertain. The historical collection is still relevant for taxonomic studies and for offering new insights into palaeobiogeography and palaeobiology of mammalian fauna of the region during the Pleistocene.

Estimating mammal density from track counts collected by Indigenous Amazonian hunters

Monitoring programs must produce reliable estimates of animal population density to effectively guide management decisions and conservation action. Popular methods used to estimate density rely on visual encounters which are difficult to obtain for many large-bodied mammals in tropical forests. This study uses the Formozov-Malyshev-Pereleshin (FMP) method to produce density estimates for four terrestrial mammals based on track counts collected by Indigenous hunters in the Amazon. The focal species include collared peccary (Peccari tajacu), white-lipped peccary (Tayassu pecari), lowland tapir (Tapirus terrestris), and jaguar (Panthera onca). For each species, track detections were greater than visual detections and were found on more transects with a fewer number of surveys. Density estimates were produced for each focal species in hunted and nonhunted sites. These results were compared against the median of 84 density estimates located in the literature that differentiated between hunted and nonhunted sites in the Amazon. Results demonstrate that the FMP method is a reasonable and cost-efficient method. This method can directly engage Indigenous and other local peoples in research, as opposed to replacing their skills with technologies or professional biologists. Overall, this method complements traditional transect surveys and can improve our understanding and management of wildlife across the tropics.

Impact of environmental variables on some reproductive metrics of white-lipped peccaries (Tayassu pecari) raised in Atlantic Forest of Brazil

Knowledge on male reproductive physiology is essential for the development of effective conservation strategies. This study investigated the influence of environmental variables on certain reproductive metrics in white-lipped peccaries (Tayassu pecari) raised in the Atlantic Forest. After anesthetization, testicular and cauda epididymis biometry were evaluated in nine adult male individuals subjected to electroejaculation. Semen was evaluated for volume, pH, concentration, total number of sperm, sperm morphology, membrane integrity, and kinematic parameters. Concurrently, environmental variables were collected from the day before, for the previous 14 days (estimated for sperm maturation in epididymis), and the period of 51–55 days (corresponding to the spermatogenic cycle) before semen collection. Overall, it was observed that rainfall is the most important environmental variable influencing the reproductive parameters of white-lipped peccaries, being positively correlated with the amplitude of lateral sperm head displacement (ρ = 0.62, P < 0.05) and the appearance of proximal cytoplasmic droplets in sperm (ρ = 0.62, P < 0.05). In addition, the testicular biometry of the species is influenced by the set of environmental variables of air temperature, rainfall, and relative humidity (ρ ≥ 0.60, P < 0.05). On the other hand, epididymal biometric data showed numerous correlations between cauda epididymis metrics and sperm parameters (ρ = 0.68, P < 0.05). This information will be useful to improving conservation strategies for these animals, contributing to their management in captivity and to reintroduction programs, especially in the Atlantic Forest where the species is declining.