Programa de Pós-Graduação em Biodiversidade e Conservação - PPGBC/Altamira
URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/9260
Surge em 2014 diante da necessidade de formar profissionais capacitados para lidar com os aspectos ambientais, econômicos e sociais que permeiam a biodiversidade brasileira e, em especial, a da região amazônica. O PPGBC está vinculado ao Campus Universitário de Altamira, da Universidade Federal do Pará (UFPA), suprindo uma importante demanda do ensino superior na região Transamazônica e Xingu.
Área de conhecimento: Ciências Biológicas (Ecologia, Zoologia, Fisiologia, Morfologia, Genética, Botânica, Sistemática, Taxonomia, Filogenia, Microbiologia), as Ciências Exatas e Naturais (Geologia, Matemática e Estatística), e às Ciências Sociais Aplicadas (Economia e Sociologia).
Navegar
Navegando Programa de Pós-Graduação em Biodiversidade e Conservação - PPGBC/Altamira por Orientadores "SOUSA, Leandro Melo de"
Agora exibindo 1 - 4 de 4
- Resultados por página
- Opções de Ordenação
Item Acesso aberto (Open Access) Caracterização espermática de Parancistrus nudiventris Rapp Py-Daniel & Zuanon, 2005 (Siluriformes, Loricariidae), espécie amazônica endêmica do Rio Xingu, Pará, Brasi(Universidade Federal do Pará, 2025-03-21) LOPES, Thaís da Silva; SOUSA, Leandro Melo de; http://lattes.cnpq.br/6529610233878356; https://orcid.org/0000-0002-0793-9737Item Acesso aberto (Open Access) Descrição e osteologia de uma nova espécie do gênero Leporinus (Characiformes: anostomidae) do rio Xingu, Para, Brasil(Universidade Federal do Pará, 2022-12-19) CHAVES, Cláudia Sousa; BIRINDELLI, José Luis Olivan; http://lattes.cnpq.br/4475607120379771; https://orcid.org/0000-0001-9646-9636; SOUSA, Leandro Melo de; http://lattes.cnpq.br/6529610233878356; https://orcid.org/0000-0002-0793-9737; https://orcid.org/0000-0001-9646-9636The fishes of the Anostomidae family are popularly known in Brazil as aracus, piaus and piaparas, being widely distributed in the Neotropical region, with more than half of the 150 known species concentrated in the Amazon. In the Xingu River, 23 species of Anostomidae are known, and the present study seeks to expand knowledge about the diversity of Anostomidae in the Xingu River basin, through the description of a new species, using traditional taxonomy tools and molecular markers, in addition to verify its distribution pattern and conservation status. The analyzed material comes from collections in the upper, middle and lower reaches of the Xingu River, and is deposited in the scientific collections of LIA, INPA, MZUSP, MPEG and MZUEL. A total of 56 individuals were analyzed. Leporinus sp.2 has a body with a longitudinal dark stripe that goes from the anterior portion of the operculum to the caudal peduncle, formed by horizontally elongated macules, dark transverse bars on the dorsum and 3/4 dental formula. It is similar in color pattern to L. britskii, L. guttatus, L. marcgravii, L. microphysus, L. unitaeniatus, L. vanzoi and L. octomaculatus. The new species differs from L. britskii, L. guttatus, L. marcgravii and L. octomaculatus by having 16 rows of scales around the caudal peduncle (vs. 12), from L. unitaeniatus, L. vanzoi by having three teeth on the premaxilla (vs, four). The DNA Barcode data also corroborate this hypothesis, since the new species differs from all analyzed congeners. The closest congeners of the new species are L. uniateiniatus and L. vanzoi, with whom it has a genetic distance of about 3%. Osteological characteristics of the species are described, illustrated and discussed.Osteological characteristics of the species are described, illustrated and discussed.Item Acesso aberto (Open Access) Desenvolvimento inicial do Pacu-branco Myloplus Rubripinnis (Characiformes: serrasalmidae) da bacia do Rio Xingu(Universidade Federal do Pará, 2023-08-22) OLIVEIRA, Elzamara de Castro; ZACARDI, Diego Maia; http://lattes.cnpq.br/8348319991578546; HTTPS://ORCID.ORG/0000-0002-2652-9477; SOUSA, Leandro Melo de; http://lattes.cnpq.br/6529610233878356; https://orcid.org/0000-0002-0793-9737The species Myloplus rubripinnis, popularly known as the white pacu, has great ecological potential as a seed disperser and represents an important food and economic resource for several riverine families. However, little is known about the bioecology of adult specimens, and there is no research on the early development of this species. In this context, the present study aimed to morphologically characterize the initial phases of the life cycle of M. rubripinnis, captured in the middle stretch of the Xingu River, and identify the main changes in growth patterns through different regression models. The individuals were collected using a plankton net in various habitats present in the Xingu River, during the four phases of the local hydrological cycle (flood, flood, ebb, and drought) between January 2021 and April 2022. After identification, the specimens were classified according to the developmental stage into the larval period (yolk-sac, preflexion, flexion, and postflexion) and the juvenile period. A total of 55 individuals with a standard length ranging from 7.21 to 35.53 mm were analyzed. During the larval period, the eyes are large and spherical, the head size varies from small to large, and the fusiform body ranges from long to moderate, with a convex dorsal profile. The intestine reaches the middle region of the body, and the mouth is terminal. Initially, the larvae are altricial, with pigmentation scarce in the body, limited to a linear band along the lateral line and intensifying towards the back of the caudal peduncle. In the early stages, small clusters of punctate chromatophores appear in the occipital region, on the side of the snout, in the first rays of the dorsal and anal fins, at the base of the anus, and in the rays of the caudal fin. In more developed stages, irregular vertical bands form throughout the body. The total number of myomers ranged from 41 to 42 segments (21 to 22 preanal and 20 postanal). The complete sequence of fin formation and the number of unbranched and branched rays are as follows: caudal (superior iiii+9-7+iiii inferior), dorsal (iii,20), anal (iii,32), ventral (i,5), and pectoral (i,10). The growth analysis indicated greater changes during the transition from the flexion to the post-flexion stages, marking the end of larval development. It is noteworthy that the pattern of pigmentation, along with meristic data, serves as effective distinguishing characteristics for identifying the species among its congeners. This emphasizes the importance of morphological, meristic, and morphometric aspects for the accurate identification of the species in its naturals environment. Additionally, this information can aid in understanding the locations and spawning periods, as well as contribute to the management, conservation, and sustainability efforts of this Neotropical fish.Item Acesso aberto (Open Access) Desenvolvimento osteológico de Pseudacanthicus pirarara (Siluriformes, Loricariidae)(Universidade Federal do Pará, 2023-02-16) RAMOS, Lucas Fernando Peres; CHAMON, Carine Cavalcante; http://lattes.cnpq.br/6917927460947313; https://orcid.org/0000-0003-1122-6788; SOUSA, Leandro Melo de; http://lattes.cnpq.br/6529610233878356; https://orcid.org/0000-0002-0793-9737The Loricariidae family is characterized by encompassing a great diversity of species, many of which are present in the Amazon basin. Pseudacanthicus pirarara is a large- sized catfish species that has records of occurrence in the Xingu river basin. The species has an intense orange or almost red color on its fins, in addition to rows of yellow covered by dermal bone plates formed by highly developed odontodes, these are characteristics that make P. pirarara a prominent species in the aquarium trade, in which has long attracted the attention of aquarists around the world. One of the most studied anatomical systems in fish is the skeleton, so that the characteristics present in the bones of individuals are essential for directing work on the description and morphology of species. Studies that investigate the osteological development of fish can be carried out with individuals in different periods of life, however, works that use specimens in the initial stages of development are more detailed, presenting exclusive data, in addition to serving as comparison material for other Teleosts. Thus, the main objective of this study is to carry out a complete osteological description of the representatives of Pseudacanthicus pirarara that are in the initial stages of life, in addition to reporting the osteological development of the individuals during the larval period. The specimens used for this study come from ex situ reproduction procedures realized at the Laboratório de Aquicultura de Peixes Ornamentais do Xingu (LAQUAX). One hundred individuals were obtained in different stages of life and degrees of development. For the osteological analyses, the individuals were submmited to the Taylor & Van Dyke diaphanization protocol with adaptations for larvae. Subsequently, osteological analyzes were carried out through the dissection of the specimens, so that a complete elaboration of the nomenclature of the bone structures was possible. During the analyses, we investigated the moment of ossification of the structures, considering the life stages and the standard length of the individuals, seeking to record the initial ontogenetic development, and to elaborate the first osteological description of a large Loricariidae species. Finally, we discuss the heterochronies and the moment of ossification of the bone complexes in P. pirarara, comparing with the available ontogenetic data of another representative of Loricariidae, and of two other Siluriformes.