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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Composição e variação temporal e nictemeral da fauna zooplanctônica na zona de arrebentação em Praia Grande, SP /

Moreno, Danúbia. January 2017 (has links)
Orientador: Teodoro Vaske-Junior / Resumo: As áreas costeiras de baixa profundidade, como zonas de arrebentação de praias arenosas são pouco estudadas quando comparadas a outros ecossistemas costeiros. No entanto, são consideradas de grande importância ecológica, pois abrigam alta diversidade de organismos que se alimentam, reproduzem e buscam na região proteção contra predadores. A falta de estudos deve-se principalmente à alta hidrodinâmica existente, sendo muitas vezes difícil de amostrar, principalmente no período noturno. Este estudo analisou a variação temporal e nictemeral da fauna zooplanctônica existente na zona de arrebentação da Praia da Aviação que trata-se de uma praia densamente habitada localizada no município de Praia Grande na costa central do estado de São Paulo. Os organismos foram coletados com rede de plâncton através de arrastos horizontal, superficial e perpendicular à praia em profundidade de 1m. Dados de temperatura e salinidade também foram obtidos juntamente com observações visuais do estado de agitação do mar, vento local e nebulosidade. Este processo ocorreu bimensalmente entre Junho de 2013 e Abril de 2015 durante os períodos diurno e noturno, visando avaliar a variação na composição zooplanctônica e sua relação com as migrações verticais. O zooplâncton da praia analisada foi representado por 116 táxons, englobando organismos holoplanctônicos, meroplanctônicos, bentônicos (presentes na coluna d'água devido à alta turbulência) e bentoplanctônicos (organismos que realizam migração vertical)... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Low depth coastal areas, such as surf zones at the sand beaches, are poorly studied when compared to other coastal ecosystems. However, they are considered of great ecological importance, because they shelter a high diversity of organisms that feed, reproduce and seek protection in the region against predators. The lack of studies is mainly due to the existing high hydrodynamics, and is often difficult to sample, especially at night. This study analyzed the temporal and nictemeral variation of the zooplankton existing in the surf zone of Praia da Aviação, a densely populated beach, located in the Praia Grande city, on the central coast of the State of São Paulo. The organisms were collected with plankton net through horizontal trawls, superficial and perpendicular to the beach in depth of 1m. Temperature and salinity data were also obtained along with visual observations of the state of sea agitation, local wind and cloudiness. This process occurred bimonthly between June 2013 and April 2015 during the day and night periods, With the objective of evaluating the variation in zooplankton composition and its relationship with vertical migrations. The zooplankton of the beach was represented by 116 taxa, including holoplanktonic, meroplanktonic, benthic organisms (present in the water column due to the high turbulence) and bentoplanktonic organisms (organisms that perform vertical migration). The faunal composition was quite diverse and, throughout the study, there was little variation in the diversity between the sampling periods as well as discrete seasonal variation. The total abundance of planktonic organisms captured in the daytime ranged from 384 to 14,746 org.m-³ (4.153.1 ± 5.766 org.m-³) and, during the night from 504 to 67,269 org.m-³ (7,845.3 Ñ 18,844 org.m-³). The zooplankton community demonstrated a significant difference (p <0.000), in terms of abundance, between the holoplankton... (Complete abstract electronic access below) / Mestre

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