O material arribado em praias arenosas influencia a composição de comunidades bentônicas locais?
Data
2022-12-12
Autores
Paula, Ricardo Moreira de Jesus [UNIFESP]
Orientadores
Yokoyama, Leonardo Querobim [UNIFESP]
Tipo
Trabalho de conclusão de curso de graduação
Título da Revista
ISSN da Revista
Título de Volume
Resumo
Ecossistemas costeiros são regiões de transição ecológica entre os ambientes marinhos e terrestres, e que apresentam disponibilidade a aportes orgânicos e inorgânicos, os quais podem favorecer a produtividade primária e abundância populacional. Entre os exemplos de aportes, existem os materiais arribados, que são normalmente carreados pela ação das ondas e possuem uma grande diversidade associada. Estes materiais desempenham um grande papel como suprimento orgânico na rede alimentar costeira, principalmente para regiões com carência de produtividade local, como algumas praias arenosas. Além disso, a decomposição do material arribado fornece nutrientes ao sedimento, além de melhorias às condições de temperatura e umidade, gerando um possível aumento na produtividade primária do microfitobento. Pesquisas sobre a composição macrofaunística do material arribado em praias são quase nulas no Brasil, enquanto que, este estudo se comporta como um dos pioneiros na análise da relação direta do material com a produtividade dos microfitobento. Neste sentido, esta pesquisa identificou a composição das comunidades macrobentônicas associadas ao material arribado, além de verificar a sua influência na produção primária microfitobentônica, na Praia da Barra do Una, litoral sul paulista. A abundância e a riqueza de espécies foram maiores nas amostras associadas ao material arribado, onde esta relação era estabelecida como habitat, suprimento alimentar e refúgio de predadores. As concentrações de pigmentos não diferiram entre os componentes, possivelmente sugerindo uma relação de adaptação e coexistência do microfitobento com o material. Com isso, tornou-se perceptível a importância dos materiais arribados na dinâmica de comunidades bentônicas em praias arenosas, entretanto, é inegável a insuficiência de estudos no Brasil e no Mundo. Uma vez que, ao longo do ano podem ocorrer diversas variações na aparência física, distribuição e permanência dos materiais arribados, que alteram toda dinâmica da composição associada.
Coastal ecosystems are regions of ecological transition between marine and terrestrial environments, and which are available to organic and inorganic inputs, which can favor primary productivity and population abundance. Among the examples of inputs, there are the beach wracks, which are normally carried by wave action and have a great associated diversity. These materials play a large role as an organic supply in the coastal food web, especially for regions with a lack of local productivity, such as some sandy beaches. In addition, the decomposition of the beach wrack provides nutrients to the sediment, in addition to improvements in temperature and humidity conditions, generating a possible increase in the primary productivity of the microphytobentum. Researches on the macrofaunistic composition of the beach wrack on beaches are almost non-existent in Brazil, while this study behaves as one of the pioneers in the analysis of the direct relationship between the material and the productivity of microphytobentos. In this sense, this research identified the composition of the macrobenthic communities associated with the beach wrack, in addition to verifying their influence on the microphytobenthic primary production, in Praia da Barra do Una, south coast of São Paulo. Species abundance and richness were higher in samples associated with beach wrack, where this relationship was established as habitat, food supply and refuge from predators. Pigment concentrations did not differ between the components, possibly suggesting a relationship of adaptation and coexistence of the microphytobentum with the material. With this, the importance of beach wracks in the dynamics of benthic communities on sandy beaches became perceptible, however, the lack of studies in Brazil and in the world is undeniable. Since, throughout the year, there may be several variations in the physical appearance, distribution and permanence of the beach wracks, which alter the entire dynamics of the associated composition.
Coastal ecosystems are regions of ecological transition between marine and terrestrial environments, and which are available to organic and inorganic inputs, which can favor primary productivity and population abundance. Among the examples of inputs, there are the beach wracks, which are normally carried by wave action and have a great associated diversity. These materials play a large role as an organic supply in the coastal food web, especially for regions with a lack of local productivity, such as some sandy beaches. In addition, the decomposition of the beach wrack provides nutrients to the sediment, in addition to improvements in temperature and humidity conditions, generating a possible increase in the primary productivity of the microphytobentum. Researches on the macrofaunistic composition of the beach wrack on beaches are almost non-existent in Brazil, while this study behaves as one of the pioneers in the analysis of the direct relationship between the material and the productivity of microphytobentos. In this sense, this research identified the composition of the macrobenthic communities associated with the beach wrack, in addition to verifying their influence on the microphytobenthic primary production, in Praia da Barra do Una, south coast of São Paulo. Species abundance and richness were higher in samples associated with beach wrack, where this relationship was established as habitat, food supply and refuge from predators. Pigment concentrations did not differ between the components, possibly suggesting a relationship of adaptation and coexistence of the microphytobentum with the material. With this, the importance of beach wracks in the dynamics of benthic communities on sandy beaches became perceptible, however, the lack of studies in Brazil and in the world is undeniable. Since, throughout the year, there may be several variations in the physical appearance, distribution and permanence of the beach wracks, which alter the entire dynamics of the associated composition.
Descrição
Citação
PAULA, Ricardo Moreira de Jesus. O material arribado em praias arenosas influencia a composição de comunidades bentônicas locais? 2022. 32 f. Trabalho de Conclusão de Curso (Graduação em Bacharelado Interdisciplinar em Ciência e Tecnologia do Mar) - Instituto do Mar, Universidade Federal de São Paulo, Santos, 2022.