Navegando por Autor "Bezerra, Bruna"

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Artigo
How do landscape and life history traits contribute to the threat context of Brazilian primates?
(Animal Conservation, 2023) Matte, Ana L. L.; Buss, Gerson; Fialho, Marcos de Souza; Becker, Fernando G.; Jerusalinsky, Leandro; Lacerda, J. C. de; Santos, P. J. P.; Bezerra, Bruna
Brazilian primates differ regarding landscape characteristics within their ranges (e.g. habitat availability) and life-history traits (e.g. body size). These landscape and life history attributes may be related to extinction risk. Here, we verified how such attributes correlate with primate threat categories. We considered 124 Brazilian primates based on the 2014 Brazilian list of threatened (Critically Endangered, Endangered and Vulnerable) and non-threatened (Least Concern and Near Threatened) species. We then characterized their landscape (i.e. habitat availability, habitat loss and fragmentation, indigenous lands, roads, urban areas, deforestation arch) and life-history attributes (i.e. body weight, gestation length and generation time), which together make up the threat context for each threat category. We compared threat categories to identify differences in such attributes, considering biome (Atlantic Forest, Amazon, Caatinga and Cerrado) as a factor and testing for phylogenetic effect. We investigated the attributes responsible for group characterization for specific threats and binary threatened/non-threatened categories. We show that life history and landscape attributes differ in the biomes. However, only landscape features varied across biomes. In the Amazon, the threatened categories reached the highest level of habitat loss in the last 30 years, while in the Atlantic Forest, the landscape of threatened species had the highest proportions of roads and urban areas. Most threatened species landscapes in the Caatinga and Cerrado were highly fragmented. We found a positive link between human impacts and extinction risk in the Amazon. In the other biomes, anthropogenic landscape characteristics were associated with threatened and non-threatened species. Threatened species tended to have large bodies and a slow life history, regardless of the biome. The more closely related the species, the more similar the traits. We suggest considering biomes and threat categories together with specific landscape and life history attributes to distinguish primate threat context for species conservation priority-setting.
Artigo
Vocal complexity in Antillean manatees (Trichechus manatus manatus)
(2022-12-14) Umeed, Rebecca; Lucchini, Karen; Santos, Paulo J.P.; Attademo, Fernanda; Luna, Fábia; Normande, Iran; Bezerra, Bruna
Vocal complexity can be expressed through variations in repertoire size, structure, and individual manatee repertoires. Here we aimed to assess the complexity of the vocal behaviour of Antillean manatees living in captivity (i.e., artificial pools) and in reintroduction enclosures (i.e., natural enclosures placed in an estuarine area). Specifically, we evaluated: (i) the structure of vocalisations to assess whether they had variants; (ii) the variation in call production (rate and pattern) between groups with different configurations; (iii) whether individuality occurred in vocalisation structure. We found four categories of vocalisations, of which two had different variants. Not all study groups produced all call categories and variants. Older and younger males in the reintroduction enclosures had the highest call rates compared to captive females and captive males. The vocal and behavioural patterns differed between groups. Squeak call structure differed between individuals. Such vocal complexity may aid manatees in adapting to their dynamic social and structural environment, facilitating communication.