01. Universidade Federal Rural de Pernambuco - UFRPE (Sede)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/1
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Resultados da Pesquisa
Item Avaliação da estrutura populacional dos elasmobrânquios em um ecossistema insular no Oceano Atlântico Equatorial(2024-03-08) Rocha, Geremias Anacleto Lira da; Oliveira, Paulo Guilherme Vasconcelos de; Bezerra, Natalia Priscila Alves; http://lattes.cnpq.br/5613525779232672; http://lattes.cnpq.br/5700488412022830; http://lattes.cnpq.br/7804455435101278Observation per unit effort (OPUE) data were utilized to assess the population structure of elasmobranchs comprising the fauna of the São Pedro and São Paulo Archipelago (SPSPA) in the Equatorial Atlantic Ocean based on sightings during the period from 2008 to 2019. In this context, the overall objective of the study was to provide information about the population structure of elasmobranchs in the SPSPA fauna through sightings obtained during visual censuses in the region, aiming to contribute to the conservation of the island ecosystem and the species inhabiting the area. Throughout the study, 904 individuals were sighted during a sampling effort of 767 hours and 2 minutes of observation across 52 expeditions to the SPSPA. Rays represented 96.2% of the observations, with Mobula tarapacana being the most representative species (95.75%, n=833), followed by Mobula thurstoni (4.02%, n=35), and Mobula mobular (0.23%, n=2). Sharks accounted for 3.76% of the observations, exclusively belonging to the Carcharhinidae family, represented by the species Carcharhinus galapagensis (97.06%, n=33) and Carcharhinus falciformis (2.94%, n=1). Out of the total individuals sighted, the sex of 304 specimens was identified, with 188 being females, namely: 182 M. tarapacana, 1 M. thurstoni, and 5 C. galapagensis. For males, 116 individuals were identified, including 111 M. tarapacana, 4 M. thurstoni, and 1 C. galapagensis. Consistent variations in OPUE for the years and months of sampling indicate a trend in the occurrence of elasmobranch species in the SPSPA, with the highest annual values occurring in 2010 and 2015, and monthly values being prominent between February and August. According to IUCN criteria, only the Galapagos shark is not considered threatened with extinction in this study. Understanding the population structure of elasmobranchs is crucial for the management and conservation of species in the SPSPA, thereby contributing to the development of strategies to better understand the status of their populations and reduce their interaction with fishing activities.Item Demografia e estrutura populacional da raça caprina Moxóto com base em análise de pedigree(2019-12-12) Silva, Raíssa Camila da; Ribeiro, Maria Norma; http://lattes.cnpq.br/3643578234373660; http://lattes.cnpq.br/4420581591960235Among the several locally adapted genetic groups of goats from Northeast of Brazil, the Moxotó breed stands out. Despite its importance, the breed has been suffering a genetic dilution and, consequently, its currently considered as endangered. An important factor to understand the existing genetic variability is the study of demography and populational structure, which allows the determination of the level of risk of the breed. The definition of the degree of endangerment of a breed is essential for the definition of efficient genetic enhancement and conservation programs. The present study aimed to evaluate the demography and populational structure of Moxotó breed using the pedigree analysis. Were used information from 571 animals, from 5 herds. The data collection was done between 1981 and 2007. Were estimated the endogamy (ΔF), average kinship coefficient (AR), effective number of founder animals ( ), effective number of ancestors ( ), Wright’s F-statistics (Fis, Fit e Fst), the genetic contribution of the herds and the generation intervals (IEG). The statistical analysis was done with the support of Endog® v4.8 software. It was observed a value of 31 for , close to the value of (36). From the total pedigree information, only 15,76% had information about the father and, 15,41% had information about the mother. Due to the amount of incomplete information on the pedigree it was not possible to calculate the average inbreeding coefficient (F) for the population nor for generations. A significantly low value of ancestors (N=12) explain 50% of the genetic variability of the population. The Fit value (-0,001483) indicates the presence of genetic variability in the population. The Fst value (0,004396) indicates the existence of genetic diversity among subpopulations. The -0,005905 of FIS indicates the existence of genetic variability inside the population. Despite the reduced effective number, there is still genetic diversity inter and intra-population that can be used by genetic conservation and genetic enhancement programs. Under this conditions, programs of genetic enhancement should be avoided until the effective numbers are fully recovered.