Programa de Pós-Graduação em Bioecologia Aquática
Permanent URI for this communityhttps://repositorio.ufrn.br/handle/123456789/11897
Browse
50 results
Search Results
Master Thesis Inventário das espécies de peixes da costa do Estado do Rio Grande do Norte e aspectos zoogeográficos da ictiofauna recifal do Oceano Atlântico(Universidade Federal do Rio Grande do Norte, 2006-05-04) Garcia Júnior, José; Oliveira, Jorge Eduardo Lins; ; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4781872Z1; ; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4739386P6; Rosa, Ricardo de Souza; ; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4781402H5; Mendes, Liana de Figueiredo; ; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4790957P8We present a checklist of the shores fishes of the coast of the Rio Grande do Norte state. Species were registered through the specimens collection, underwater records, samples in landings of artisanal fleet and by compilation of data from literature and ichthyologic collections, between January 2004 to 2006. A total of 440 species form 2 classes, 25 orders, 106 families and 253 genus were registered. It is believed that due the great increase of the number of species registered, the ichthyofauna of the coast of this state is reasonably knownMaster Thesis Comunidades zooplanctônicas como bioindicadoras da qualidade da água de quatro reservatórios da região semi-árida do Rio Grande do Norte(Universidade Federal do Rio Grande do Norte, 2007-02-12) Sousa, Wanessa de; Attayde, José Luiz; Sant'ana, Eneida Maria Eskinazi; ; ; http://lattes.cnpq.br/4121209629385349; ; http://lattes.cnpq.br/9001060410482805; Bozelli, Reinaldo Luiz; ; http://lattes.cnpq.br/4521181963290823The response of zooplankton assemblages to variations in the water quality of four man-made lakes, caused by eutrophication and siltation, was investigated by means of canonical correspondence analysis. Monte Carlo simulations using the CCA eingenvalues as test statistics revealed that changes in zooplankton species composition along the environmental gradients of trophic state and abiogenic turbidity were highly significant. The species Brachionus calyciflorus, Thermocyclops sp. and Argyrodiaptomus sp. were good indicators of eutrophic conditions while the species Brachionus dolabratus, Keratella tropica and Hexarthra sp. were good indicators of high turbidity due to suspended sediments. The rotifer genus Brachionus was the most species-rich taxon, comprising five species which were associated with different environmental conditions. Therefore, we tested whether this genus alone could potentially be a better biological indicator of these environmental gradients than the entire zooplankton assemblages or any other random set of five species. The ordination results show that the five Brachionus species alone did not explain better the observed pattern of environmental variation than most random sets of five species. Therefore, this genus could not be selected as a target taxon for more intensive environmental monitoring as has been previously suggested by Attayde and Bozelli (1998). Overall, our results show that changes in the water quality of man-made lakes in a tropical semi-arid region have significant effects on the structure of zooplankton assemblages that can potentially affect the functioning of these ecosystemsMaster Thesis Estádios larvais e ocorrência sazonal de imaturos de Psaroniocompsa incrustata (Lutz,1910)(Diptera:Smimuliidae) no Rio Pium, município de Nísia Floesta, RN(Universidade Federal do Rio Grande do Norte, 2006-12-15) Silva, Adriele Noronha Barbosa da; Andrade, Herbet Tadeu de Almeida; Medeiros, Jansen Fernandes; ; http://lattes.cnpq.br/5425946423248431; ; http://lattes.cnpq.br/0984577704595246; ; http://lattes.cnpq.br/1378406787391037; Chellappa, Naithirithi Tiruvenkatachary; ; http://lattes.cnpq.br/1365437036105422The larval instars, seasonal occurrence and environmental factors influence on Psaroniocompsa incrustata (Lutz, 1910) (Diptera: Simuliidae) immature were studied according to its physical and chemical aspects of breeding water. Four collects were made at vegetal substrate from margin, middle and floating on the Pium river, city of Nísia Floresta, state of Rio Grande do Norte, Brazil at dry and wet season. Some of larval characters were used to determinate the larval instars number like lateral length of cephalic capsulae, antennae and the distance among cephalic apodema, as well as pH, water temperature, width, depth, stream velocity, discharge and pluviometric precipitation were used for physical factors. Seven larval instars were determined for this P. incrustata community being the lateral length of cephalic capsulae as the best structure with this meaning propose. The seasonality immature abundance of this species were found in dry season and a positive correlation with pH, stream velocity and precipitationMaster Thesis Biodiversidade e abundância da ictiofauna associada ao cultivo orgânico de Litopenaeus vannamei (Boone, 1931)(Universidade Federal do Rio Grande do Norte, 2006-12-13) Costa Júnior, Marcos Antônio Freire da; Câmara, Marcos Rogério; ; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783008H5; ; http://lattes.cnpq.br/6000675405694677; Soriano, Eliane Marinho; ; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4786301Y8&dataRevisao=null; Henriques, Virgínia Maria Cavalari; ; http://lattes.cnpq.br/7474726328102423; Mendonça, Maísa Clari Farias Barbalho de; ; http://lattes.cnpq.br/9714598282205989; Cavali, Ronaldo Olivera; ; http://lattes.cnpq.br/1788304737175283The expansion of shrimp farming has caused a series of environmental impacts, often as a result of lack of planning and adequate management. Organic aquaculture has emerged as an alternative to conventional shrimp farming, and differently, aims at the economical, ecological and farming potential of other organisms, such as fishes, oysters and seaweeds. The present study aimed at evaluating the biological diversity and abundance of the ichthyofauna associated to Litopenaeus vannamei organic culture at PRIMAR farm (Rio Grande do Norte, Brazil). The sampling period consisted of four culture cycles (1, 2, 3, and 4) accomplished in four grow-out ponds (V1, V7, V2, and V4) in 2005. The first two culture cycles were carried out during the rainy season, and the last two cycles, during the dry season. Environmental (temperature, salinity, transparency, and rainfall), biodiversity (diversity and uniformity and abundance indexes) of the ichthyofauna, and shrimp productivity data were collected throughout these four culture cycles. The results obtained for the environmental variables showed that both salinity and transparency oscillated in a significant way (p < 0.001) between culture cycles. In relation to the abundance of the ichthyofauna, fifty four species associated to the organic culture of Litopenaeus vannamei were collected and identified at PRIMAR. For the biodiversity criterion, larger species richness (S = 46) and uniformity (E = 0.59 ± 0.16) were observed during cycles 3 and 4 than in cycles 1 and 2 (S = 41 and E = 0.15 ± 0.12). A positive and significant correlation was obtained for the transparency with diversity and uniformity of fish species between cycles 1 and 2 (wet season) and cycles 3 and 4 (dry season) (p < 0.017 - Shannon Index; p < 0.008 - Pielou Index, respectively). A correlation could not be established between shrimp productivity and fish biomass. However, fish biomass decreased from cycles 1 and 2 to cycles 3 and 4, concomitant with an increase in shrimp productivity, most probably due to a higher (from 58.0% to 71.0%) shrimp survival. Regarding the culture potential of the ichthyofauna, three species (Mugil curema, Mugil liza and Chaetodipterus faber) were identified as potential farming alternatives, either singly or in consortium with Litopenaeus vannamei. A fourth species (Centropomus undecimalis) was indicated as an alternative for single culture or in consortium with other fish species. In conclusion, the large diversity of estuarine fishes associated to Litopenaeus vannamei farming observed at PRIMAR clearly indicated the ecological feasibility for organic aquaculture in northeastern BrazilMaster Thesis Características limnológicas e estrutura trófica das comunidades de peixes de alguns lagos naturais e artificiais do Rio Grande do Norte(Universidade Federal do Rio Grande do Norte, 2007-03-21) Rodrigues, Michele de Medeiros; Attayde, José Luiz; ; http://lattes.cnpq.br/4121209629385349; ; Mendes, Liana de Figueiredo; ; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4790957P8; Silva, Gustavo Henrique Gonzaga da; ; http://lattes.cnpq.br/9715919793525325Artificial lakes must differ from natural lakes in important structural and functional aspects that need to be understood so that these ecosystems can be properly managed. The aim of this work was to test the hypothesis that the artificial lakes (impoundments) in the semi-arid region of the Rio Grande do Norte State are more eutrophic and turbid and have different trophic structure when compared to the natural coastal lakes that occur in the humid eastern coast of the State. To test this hypothesis, 10 natural lakes and 8 artificial lakes with about 100 ha were sampled between September and November 2005 for the determination of some limnological variables and the abundance of the main fish species, which were grouped in three trophic guilds: facultative piscivores, facultative planktivores and omnivores. The results show that the artificial lakes had significantly higher concentrations of total nitrogen, total phosphorus, chlorophyll a , total and volatile suspended solids than the natural lakes. Results also show that the values of pH, total alkalinity, electric conductivity, turbidity as well as the coefficient of vertical attenuation of light were significantly higher in the artificial lakes than in the natural lakes. In the artificial lakes, the abundance of facultative planktivores was significantly higher, while the abundance of facultative piscivores significantly lower than in the natural lakes. There was no significant difference in the abundance of omnivorous fish between the two types of lakes. These results suggest that the increase in turbidity together with the other changes in the water quality of the artificial lakes, modifies the trophic structure of the fish communities reducing the importance of piscivores and the length of the food chainsMaster Thesis Potencialidades de cultivo de macroalgas no litoral do Rio Grande do Norte (NE, Brasil): uma perspectiva de integração de dados ambientais em sistemas de informação geográfica (SIG)(Universidade Federal do Rio Grande do Norte, 2007-04-20) Moura, Euriel Aguiar; Soriano, Eliane Marinho; Souza, Flavo Elano Soares de; ; http://lattes.cnpq.br/5408876250195826; ; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4786301Y8&dataRevisao=null; ; http://lattes.cnpq.br/5900229191763792; Câmara, Marcos Rogério; ; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783008H5; Mendonça, Maísa Clari Farias Barbalho de; ; http://lattes.cnpq.br/9714598282205989Since centuries ago, the Asians use seaweed as an important source of feeding and are their greatest world-wide consumers. The migration of these peoples for other countries, made the demand for seaweed to increase. This increasing demand prompted an industry with annual values of around US$ 6 billion. The algal biomass used for the industry is collected in natural reservoirs or cultivated. The market necessity for products of the seaweed base promotes an unsustainable exploration of the natural banks, compromising its associated biological balance. In this context, seaweed culture appears as a viable alternative to prevent the depletion of these natural supplies. Geographic Information Systems (GIS) provide space and produce information that can facilitate the evaluation of important physical and socio-economic characteristics for the planning of seaweed culture. This objective of this study is to identify potential coastal areas for seaweed culture in the state of Rio Grande do Norte, from the integration of social-environmental data in the SIG. In order to achieve this objective, a geo-referred database composed of geographical maps, nautical maps and orbital digital images was assembled; and a bank of attributes including physical and oceanographical variables (winds, chains, bathymetry, operational distance from the culture) and social and environmental factors (main income, experience with seaweed harvesting, demographic density, proximity of the sheltered coast and distance of the banks) was produced. In the modeling of the data, the integration of the space database with the bank of attributes for the attainment of the map of potentiality of seaweed culture was carried out. Of a total of 2,011 ha analyzed by the GIS for the culture of seaweed, around 34% or 682 ha were indicated as high potential, 55% or 1,101 ha as medium potential, and 11% or 228 ha as low potential. The good indices of potentiality obtained in the localities studied demonstrate that there are adequate conditions for the installation of seaweed culture in the state of Rio Grande do NorteMaster Thesis Abundância das formas imaturas de Psaroniocompsa incrustata ( Lutz, 1910) (Diptera: Simuliidae) em um criadouro natural no rio Pium/RN, e sua fauna associada(Universidade Federal do Rio Grande do Norte, 2006-12-15) Rodrigues, Francilene Miranda dos Santos; Andrade, Herbet Tadeu de Almeida; ; http://lattes.cnpq.br/0984577704595246; ; Chellappa, Sathyabama; ; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787789Y9; Medeiros, Jansen Fernandes; ; http://lattes.cnpq.br/5425946423248431The species psaroniocompsa incrustata (Lutz, 1910) was studied in relation to its abundance in different and seasonal periods, the physico-chemical of the breending ground and the fauna predation added to the immature of the species. The study was developed during eight months, from April to July, 2005 (rainy season) and from October, 2005 to January, 2006 (drought season), in one natural breending ground situated in the Pium river, that is part of the hydrographical basin of the Pirangi river in Rio Grande do Norte. The immature of Simuliidae were collected manually in vegetal substrate. At the same place, it was made one sampling of the associated fauna using Suber collectors and the measurement of the environment variants. It was also made one analysis of the stomach content of possible enemies of the simulídeos, to observe the predation of the associated fauna. It was collected 7.713 samples, all from de species P. Incrustata, it was observed a bigger abundance in the drought season, and the entomologic fauna associated totalizing 20.1314 species, distributed in the kinds: Diptera, Ephemeroptera, Odonata, Trichoptera, e Hemiptera, with a bigger representativity of Dipteros. The analysis of the stomach content of the species from the families Libellulidae and Hydropsychidae showed the presence of the simulídeos in only 4% of the material analysed, therefore it was not confirmed the presence of one efficient biological control of the simulídeos in this breending groundMaster Thesis Demanda química de oxigênio, clorofila a e comunidade fitoplanctônica como indicadores da qualidade da água no Canal do Pataxó/RN(Universidade Federal do Rio Grande do Norte, 2007-02-13) Câmara, Fabiana Rodrigues de Arruda; Chellappa, Naithirithi Tiruvenkatachary; ; http://lattes.cnpq.br/1365437036105422; ; http://lattes.cnpq.br/3752890824802280; Chellappa, Sathyabama; ; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787789Y9; Rocha, Odete; ; http://lattes.cnpq.br/7577441794992601; Cacho, Maria do Socorro Ribeiro Freire; ; http://lattes.cnpq.br/0889302326025293The current study examined spatial-temporal modifications and water quality through chemical and biotic indicators during both dry (January, February and November 2006) and wet seasons (March to June 2006). This study was carried out in Armando Ribeiro Gonçalves Reservoir, RN, Canal do Pataxó and after the water station treatment (WST). The physical-chemical parameters were measured in situ and inorganic nutrients, chlorophyll a and Free Oxygen Demand (FOD) were analyzed in laboratory conditions. Quali quantitative analyses of phytoplankton were carried out utilizing Sedgwick-Rafter camera. Results indicate that DQO concentrations were low. FOD concentrations in the reservoir were comparatively higher in the dry season (5.21 mgL-1; 5.64 mgL-1 e 6.05 mgL-1) in relation to the wet season (4.52 mgL-1; 4.12 mgL-1 e 4.92 mgL-1), in surface, intermediate and bottom waters, respectively. FOD values were inferior to 1.0mgL-1in both Canal do Pataxó and after WST, which is considered adequate for public use reservoirs. Although FOD concentrations were low, Armando Ribeiro Gonçalves Reservoir, Canal do Pataxó and WST were classified as euthophizied, mesotrophic ad oligotrophic, respectively, considering the Index of Trophic State Criteria. Chlorophyll a concentrations in the study reservoir were higher in the surface (199.2 µgL-1) during the wet season, whereas in Canal do Pataxó concentrations decreased from 1.56 µgL-1 to 0.028 µgL-1, and after WST values were low (0.059 µgL-1). Dominance of cianobacterias, such as Planktotrhix agardhii (dry season) and Microcystis sp (wet season) was registered in all three areas. In the reservoir and Canal do Pataxó, density of cianobacterias, such as P. agardhii and Microcistys sp., was superior to the values allowed by the Health ministry (HM). However, after WST, density values of cianobacteria were inferior to values established by the HMMaster Thesis Caracterização da captura incidental de tartarugas marinhas pela pesca de espinhel pelágico no Nordeste do Brasil(Universidade Federal do Rio Grande do Norte, 2006-12-08) Coluchi, Rodrigo; Oliveira, Jorge Eduardo Lins; Travassos, Paulo Eurico Pires Ferreira; ; http://lattes.cnpq.br/0623255059511945; ; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4781872Z1; ; http://lattes.cnpq.br/5701382176451907; Freire, Fúlvio Aurélio de Morais; ; http://lattes.cnpq.br/8313295480738032; Garla, Ricardo Clapis; ; http://lattes.cnpq.br/6163081914700507The marine turtles biological characteristics and the impact they have been suffering in consequence of human activities have caused in the last decades the decrease of populations to unsustainable levels. All four of the species described in this paper are registered as endangered in a list by IUCN: Caretta caretta, Lepidochelys olivacea, Chelonia mydas, Dermochelys coriacea. The main causes of such impact include several fishing activities, mostly the surface longline. This paper discusses the monitoring of two foreigner longline fleet along the North East Brazilian coast between October of 2004 and September of 2005. Both operated in the West South Atlantic, one using the Chinese technique and the other the American. The American method s target species is the swordfish (Xiphias gladius), and it is characterized by using squid as bait, J 9/0 offset 5º hook, light sticks and night soaking. It also operates in shallower waters than the Chinese method. The source of information about the efforts and the catches came from onboard observers and were used to calculate the catching rate of turtles over 1000 hooks (CPUE). The American equipment caught more turtles (CPUE = 0,059; N= 103), mainly D. coriacea, while the Chinese longline caught mainly the L. olivacea and presented a CPUE= 0,018 (N= 89). The hooks were most frequently found attached to the mouth of C. caretta, C. mydas, and L. olivacea. The D. coriacea were most frequently caught by hooks externally attached to different parts of their body. There was no significant difference between the hook type catching and most turtles were still alive when released. The results suggest a greater potential of turtle catching by the American method. Besides the statistic tests have showed less interaction between the Chinese equipment and marine turtles, the catches of this fishing technique could have been underestimated due to miscommunication between the onboard observer and the vessel s crew plus the retrieve of the longline during night timeMaster Thesis Caracterização ecológica dos peixes recifais do Atol das Rocas(Universidade Federal do Rio Grande do Norte, 2006-12-06) Pinheiro, Igor Emiliano Gomes; Oliveira, Jorge Eduardo Lins; ; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4781872Z1; ; http://lattes.cnpq.br/2039223338022773; Castello, Jorge Pablo; ; http://lattes.cnpq.br/3007956907587554; Freire, Fúlvio Aurélio de Morais; ; http://lattes.cnpq.br/8313295480738032; Garla, Ricardo Clapis; ; http://lattes.cnpq.br/6163081914700507The present work was carried out at the Atol das Rocas (3º 51 S; 33º 49 W), the only atoll of the South Atlantic and the first Brazilian marine protected area. It was guided by the following hypothesis: the composition of the fish communities varies in agreement with the position of the pools; in other words, with or without permanent ocean connection. To test the validity of this hypothesis, the fish abundance was estimated in the connected pools (Barretinha/Barreta Falsa) and unconnected ones (Cemiteriozinho/Âncoras), carrying an ecological characterization of the fishes that inhabit these pools. Additionally, the structural complexity of the sampled places was also evaluated intending to verify the variations of the abundance and diversity of fishes in function to this factor. By the fact of this research was being carried out through the limits of a conservation unit, the samples was realized using visual census techniques. The results generated through uni and multivariate analytic techniques allowed the evidence that decisive factor in the density, richness and diversity variations of fishes are linked to the substratum type (Hard / Soft bottom) and not by the fact that the pool are or are not connected permanently to the ocean. In relation to the structural complexity; 58% of the variations in the diversity of fishes were attributed to changes in the structural complexity, while 12% of the variations in the abundance were attributed to the structural complexity