Dissertações em Ecologia Aquática e Pesca (Mestrado) - PPGEAP/NEAP
URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/3479
O Mestrado Acadêmico iniciou em 2007 e pertence ao Programa de Pós-Graduação em Ecologia Aquática e Pesca (PPGEAP) do Núcleo de Ecologia Aquática e Pesca da Amazônia (NEAP) da Universidade Federal do Pará (UFPA).
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Item Acesso aberto (Open Access) Dinâmica populacional de Lepidophthalmus siriboia Felder & Rodrigues, 1993 (Decapoda: Callianassidae) da Ilha de Maiandeua-PA(Universidade Federal do Pará, 2009-06-10) GIRARD, Thátila Celestino; FRÉDOU, Flávia Lucena; http://lattes.cnpq.br/4779271407117528; ROSA FILHO, José Souto; http://lattes.cnpq.br/3223362071251898Thalassinidea is marine invertebrate of great importance in the ecology of softbottom environments, especially given its influence on the flow of oxygen, energy and nutrients, and bioturbate activities. These ghost shrimps live in burrows of which depends for your needs, like protection, reproduction and feeding. In some places of the world this group has been exploited as bait. The burrowin shrimp Lepidophthalmus siriboia Felder & Lovett, 1993 (Crustacea: Callianassidae) occurs from Florida to Brazil. This study aim evaluate the structure and dynamic population of L.siriboia in the Maiandeua island (PA), associating processes observed with environmental characteristics related to sediment and water. Samples were taken monthly between June 2007 and May 2008, with a suction pump. In laboratory, animals were sexed, measured and weighed. In ovigerous females was counted the numbers of eggs in pleopods. The growth was estimated through the von Bertalanffy model that determines the relationship between carapace length (CC) and age (t). A total of 1268 organisms were captured (753 males and 515 females), which lengths ranged from 0,3 to 1,85 cm and the weight from 0,01 to 3,09g. The females monthly mean length was significantly higher than males (p<0,05) in almost months of the year. The carapace length and weight was high and significant correlation to males and females, with length positive allometric to both sexes. The size of first maturation reached was 0,7 cm to females and 0,6 cm to males. Males were proportionally more abundant, totalizing 59,4% of all organisms captured (sex ratio of 1,46 males: 1 female). There was a significant predominance of males in size classes between 0,3 and 1,2 cm and females in the size classes higher/equal than 1,2 cm. There was registred 139 ovigerous females, in which the majority (48,2%) occurred in the class interval 1,1 to 1,2 cm of carapace length. Absolute fecundity ranged of 0 to 1546 eggs/female, with average 826,25 eggs/female. There was positive and significative correlation between the numbers of eggs and the female weight. The growth female was smaller than males, and observed values for males of L_: 1,63 , K: 1, C: 0,2, WP: 0,18 e to females; L_: 1,68, K: 0,8, C: 0,2 e WP: 0,09. Mortality estimates of males were higher than females in all method used: catch curve (Z=1,67 e Z=0,11 to males and females), Beverton & Holt (Z=1,9 e Z= 1,76 to males and females) and Powell-Wetherall (Z/K=3,98 e Z/K= 2,25 to males and females). There was registered three recruitment pulses in November, February and May. The results showed : 1. males mean length is smallest than females throughout the year; 2. females are dominants in the size classes higher (_1,2 cm); 3. The reproduction is continuous with ovigerous females throughout the year; 4. growth parameters calculated was higher for males than females; 5. Females had reduced growth rate in January (WP:0,09) and males in February (WP:0,18); 6. the mortality is higher to males; 7. recruitment occurs throughout the year with three pronounced peaks in November, February and May.Item Acesso aberto (Open Access) Eficiência de diferentes abordagens metodológicas e caracterização das associações macrobentônicas estuarinas da zona costeira amazônica(Universidade Federal do Pará, 2009-06-10) MONTEIRO, Viviane Ferreira; ROSA FILHO, José Souto; http://lattes.cnpq.br/3223362071251898The estuarine macrobenthic communities from Amazonian coastal regions were characterized using different mesh sizes and sampling depths. The samplings were performed in Algodoal island and peninsula of Ajuruteua (PA), during rainy and dry seasons (June and December 2007, respectively) at the following habitats: mangrove edge, mangrove, sandy and muddy-sandy paths. At each habitat eight biological samples were collected using a cylindrical corer with 0.0079 m², as well as samples for sediment analysis (texture, moisture and organic matter concentrations) and chlorophyll a and pheopigments concentrations. Each biological sample was devided into three strata (0-5, 5-10 and 10-20 cm) and they were sieved on mesh screen sizes of 1.0, 0.5, 0.3 and 0.25 mm. Univariate (ANOVA) and multivariate (MDS, ANOSIM, SIMPER and BIOENV) techniques were used for data analysis. Macrofaunal composition consisted of 68 taxa with dominance of Annelida (Tubificidae and Capitellidae). Meshes of 0.3 and 0.25 mm were the most efficient in terms of retention of organisms and species, while the mesh of 1.0 mm lost significant quantities of organisms, especially Tubificidae. The samples collected at 10 and 20 cm depth did not differ significantly regarding to the number of taxa and organisms. Significant spatial variations were observed on the macrofaunal structure between habitats in both locations and sampling moments, with higher density and richness in muddy paths (mangrove edge and mangrove). The amount of clay, organic matter and moisture concentrations of the sediment were the most correlated environmental variables with the fauna. It could be concluded that: 1. the benthic macrofauna in Algodoal island and peninsula of Ajuruteua was composed by few taxa, and those were typically estuarine and of small dimensions, dominated by Annelida; 2. for characterization of benthic macrofauna is necessary to take samples at 10 cm depth and sieve them on mesh of 0.3 mm size; 3. Muddy-sandy habitats presented normally highest densities and richness; 4. only in Algodoal island was observed temporal variation in the structure of benthic macrofauna; 5. the amount of clay, pheopigments and moisture content in the sediment were the main factors responsible for macrofaunal structure.