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Made available in DSpace on 2019-09-12T16:57:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2015 The influence of temperature, salinity, pH and dissolved oxygen on the temporal distribution of marine cladocerans at Escuro River estuary, Municipality of Ubatuba, SP, was analysed. Sampling nearest to the surf zone was carried out from July 2004 to June 2005. The cladoceran Penilia avirostris (Dana, 1852) was the dominant species and appeared throughout the sampled period. The species Pseudevadne tergestina (Claus, 1877) and Pleopis polyphemoides (Leuckart, 1859) were the less frequent and Pleopis polyphemoides has occurred mainly in the winter. A negative relationship was obtained for P. avirostris abundance and the water dissolved oxygen, probably as an indirect effect to the water turbulence. Pleopis polyphemoides had a negative relationship with the water temperature and positive with salinity and pH. Abundance of P. tergestina was associated only with salinity. Our findings suggest that P. avirostris is the most resistant species to the local environmental oscillations and that the main factor avoiding their entrance into the estuary is the water turbulence near to the surf zone. Largest abundances of P. tergestina and P. polyphemoides are depending on higher salinity and, low temperatures are good indicators of occurrence of P. polyphemoides. [Della Posta, Patricia] Universidade de Taubaté (Unitau), Programa Posgrad Ciencias Ambientais, BR-12081010 Taubate, SP, Brazil [de Arruda Leme, Maria Helena] UNIP, Inst Ciencias & Saude, BR-12240420 Sao Jose Dos Campos, SP, Brazil

Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:23:59Z No. of bitstreams: 0Bitstream added on 2014-05-27T14:46:32Z : No. of bitstreams: 1 2-s2.0-70349243824.pdf: 467514 bytes, checksum: 5715e892e9f37021dd5b41058a12cbe7 (MD5) Made available in DSpace on 2014-05-27T11:23:59Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-09-24 This study focused the spatial and temporal distribution of the composition, abundance, and diversity of planktonic cladocerans from eutrophic, Iraí Reservoir, as well as their relationships with some biotic and abiotic variables. The tested hypothesis was that cladocerans present higher variation in a temporal than in a spatial scale. The samples were taken monthly in 6 stations, from March/02 to July/03. Twenty-four taxa were identified, distributed in 7 families, the richest families being Daphniidae (6 spp.), Chydoridae (6 spp.), and Bosminidae (5 spp.). The most frequent and abundant species were Bosmina hagmanni, Moina minuta, and Ceriodaphnia cornuta. The highest abundances were found in September/2002. Temporally, rainfall influenced organism's distribution, while spatially cladocerans were more affected by reservoir hydrodynamics and wind action. The low species richness could be a reflection of the trophic state of the reservoir, in which a dominance of Cyanobacteria was observed during that study period. Both scales showed high variation, but only the temporal scale showed significant difference to richness and abundance. Nearby the end of this study, higher stable values of species richness were recorded, which could suggest an increase in the water quality due to des-pollutions actions. Programa de Pós-Graduação em Biologia Tropical e Recursos Naturais Instituto Nacional de Pesquisas da Amazônia Universidade Federal do Amazonas, André Araújo Avenue, n 2638, Manaus, Amazonas. CEP: 69060-001 Universidade Federal do Recôncavo da Bahia Centro de Ciências Agrárias Ambientais e Biológicas - Núcleo de Estudos em Pesca e Aqüicultura (NEPA), CEP 44380-000, Cruz das Almas, BA Curso de Pós Graduação em Zoologia Universidade Estadual Paulista Júlio de Mesquita Filho - UNESP, Distrito de Rubião Jr., s/n, Botucatu, São Paulo, CEP: 18618-000 Universidade Federal do Paraná Centro de Estudos do Mar, Beira-Mar Avenue, s/no, Pontal do Sul, Paraná. CEP: 83255-000 Curso de Pós Graduação em Zoologia Universidade Estadual Paulista Júlio de Mesquita Filho - UNESP, Distrito de Rubião Jr., s/n, Botucatu, São Paulo, CEP: 18618-000

Orientação: Prof. Dr. Valter José Cobo Dissertação (Mestrado) - Universidade de Taubaté, Programa de Pós-graduação em Ciências Ambientais, Taubaté, 2006. Made available in DSpace on 2019-08-16T00:58:13Z (GMT). No. of bitstreams: 1 Patricia_Della_Posta.pdf: 1459100 bytes, checksum: 30a3f8ee6f1c8b2712cf876f09ed61e2 (MD5) Previous issue date: 2006 Resumo: O objetivo do presente trabalho é analisar a influência de fatores ambientais na ocorrência e a distribuição espaço-temporal de cladóceros marinhos em uma região estuarina rasa localizada junto a uma área de manguezal. Ao longo do período de julho de 2004 a junho de 2005, foram realizadas amostragens do zooplâncton durante as marés enchentes de sizígia em duas estações de coletas localizadas na Praia Dura, município de Ubatuba, SP. As amostragens foram realizadas em triplicatas por meio de arrastos horizontais utilizando-se uma rede cônica com fluxômetro acoplado para se determinar o volume de água filtrada e, o zooplâncton amostrado foi imediatamente fixado em formol 4% neutralizado. Concomitantemente às amostragens foram tomados dados dos fatores ambientais temperatura, salinidade, oxigênio dissolvido (OD) e potencial hidrogeniônico (pH) da água. Foram observadas três espécies de cladóceros marinhos. A espécie Penilia avirostris foi a dominante e ocorreu ao longo de todo período amostral. As espécies Pseudevadne tergestina e Pleopis polyphemoides foram menos freqüentes, mas a última apresentou variação temporal sazonal ocorrendo nos meses de inverno e primavera. A ocorrência de P. polyphemoides correlacionou-se negativamente com o fator temperatura e positivamente com o fator oxigênio dissolvido. Tanto os fatores abióticos como as abundâncias das espécies não diferenciaram entre as estações de amostragens (Teste t; sempre p > 0,05). A Análise de Componentes principais revelou que as espécies P. avirostris, P. tergestina e P. polyphemoides formaram um agrupamento sendo que 60% da variância das espécies amostradas é explicada pelo fator oxigênio dissolvido. Abstract: The aim of the present study is to analyse the occurrence and the horizontal-temporal distribution of marine cladocerans in a shallow estuarine region associated to a mangrove forest, and to verify the possible influence of environmental factors on the temporal variation of the species. In the period from July 2004 to June 2005, zooplankton samples were taken during the flood tide of sizygia in two sampling stations located on Praia Dura estuary, Ubatuba city, SP. The samples were collected in triplicates through horizontal hauls using a planktonic conic net with a fluxometer attached to determine the filtered water volume and, the sampled zooplankton was immediately preserved with 4% neutral formaldehyde solution. Simultaneously with the sampling, temperature, salinity, pH and dissolved oxygen of the water were measured. In the laboratory, subsamples were taken from the original collected samples and the zooplankton were analised under a stereomicroscope. So, the marine cladocerans were identified at species level and quantified. The zooplankton abundance was expressed by individuals per cubic meter. Three marine cladocerans species were registered in the Praia Dura estuary. Penilia avirostris was the dominant species and appeared throughout of the year. Pseudevadne tergestina and Pleopis polyphemoides were the less frequent species, but this later showed a seasonal variation occurring in the spring and summer months. The occurrence of P. polyphemoides presented negative correlationship with the temperature and a positive correlationship with the dissolved oxygen. The abiotic factors and the species abundances didnt show any statistical difference between the sampling stations (always p > 0,05). The Component of principal Analysis presented that the species P. avirostris, P. tergestina and P. polyphemoides, had organized as an group, being 60% of the variance was explained by the dissolved oxygen. Mestrado