Bacharelado em Ciências Biológicas (Sede)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/5
Siglas das Coleções:
APP - Artigo Publicado em Periódico
TAE - Trabalho Apresentado em Evento
TCC - Trabalho de Conclusão de Curso
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Resultados da Pesquisa
Item Distribuição espaço-temporal da fauna ictioplanctônica e de Chaetognatha e sua interação no litoral norte de Pernambuco(2020-01-27) Silva, Jade Beatriz Alves da; El-Deir, Ana Carla Asfora; http://lattes.cnpq.br/4822569793807941; http://lattes.cnpq.br/7346027083165974The success of the early stages of life in fish influence recruitment and determines the structure of adult populations. In the larva period, these individuals are more vulnerable to predation and other factors that affect their survival and/or mortality. Chaetognathas are described as voracious predators and can feed on fish larvae, thus affecting the distribution and success of ichthyoplankton. In this context, the study aimed to analyze the spatial distribution of ichthyoplankton in the Jaguaribe River estuary and Jaguaribe beach, correlating with the occurrence of Chaetognatha. The collections were carried out in August, September, October and December 2017 in three points, these were distributed at the mouth of the Jaguaribe River, bursting Jaguaribe beach and corral. The collected individuals were fixed in situ in 4% saline formaldehyde and later screened in laboratory and stored in ethanol 70%. 88 larvae were collected, identified in three orders and six families, including: Achiridae, Engraulidae, Carangidae, Clupeidae, Gerreidae and Gobiidae. The most abundant family was Engraulidae, being present in all months and points sampled. The surf zone was the site with the highest abundance of larvae. 574 Chaetognathas were collected and identified in one order, two families and three species. These were present in all sampled points, however, they presented greater abundance in the corral region. A total of 5305 eggs were collected, of these 4161, they were eggs of Engraulidae. The month of September presented the highest abundance of eggs, with 78.4% of the total collected. When comparing the distribution of ichthyoplankton and Chaetognathas, an overlap was observed in the occurrence of these. The spatial distribution of ichthyoplankton is highly influenced by the occurrence of Chaetognathas, since these are large predators. With a decline in the abundance of Chaetognathas there is an increase in ichthyoplankton, proving the existence of an inversely proportional relationship.Item Variação espaço-temporal na estrutura de tamanho de jovens de agulhinha-branca, Hyporhamphus unifasciatus (RanzanI, 1841) em Itamaracá - PE(2021-12-17) Barros, Ilana Amaral de; El-Deir, Ana Carla Asfora; Silva, Francisco Marcante Santana da; http://lattes.cnpq.br/4286692304867555; http://lattes.cnpq.br/4822569793807941; http://lattes.cnpq.br/3609235735445666Several species use estuarine environments for their protection, feeding, and reproduction. However, these areas are more susceptible to several human impacts. Hyporhamphus unifasciatus uses these environments, and due to the large fish landing in the last 20 years at Pernambuco state the species has potentially been impacted by human action. Thus, this study aimed to evaluate the spatio-temporal variation of the size and weight structure of young H. unifasciatus individuals through the standard length (SL) and total weight (TW) variation between three periods and by diferentes sample location. Sampling was carried out in replicates at two points (estuary and surf zone) for 12 months between the periods 2001-2002 (year 1), 2018-2019 (year 2), and 2020-2021 (year 3). The specimens, the SL and TW measurements were taken, and the specimens are deposited in the UFRPE's Ichthyology Collection. From these measurements, the frequency, weight-length relationship, and condition factor for the species population were calculated. Altogether, 436 individuals of the species were obtained, being 147 in year 1, 134 in year 2, and 155 in year 3. From these data, I did observe differences between the SL and TW between the estuary and surf zone for two of the three periods. Through the weight-length relationship, positive allometry did also observed for the three periods analyzed and, finally, significant differences were found between the growth pattern between the periods. These results indicate that through the analyzed population parameters, apparently is not overfished, however, this definition depends on more research being carried out in the area to obtain the status of the fish stock of this species.