Diversidade funcional da comunidade fitoplanctônica do baixo Rio Doce
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Data
2024-03-20
Autores
Oliveira, Fabricio Bronzoni de
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Universidade Federal do Espírito Santo
Resumo
The dynamics of phytoplankton community in aquatic ecosystems are crucial for maintaining the health and functioning of these systems, being sensitive to environmental variations and anthropogenic impacts. In the context of the Lower Doce river Basin, this community faces challenges arising from the influence of human activities, such as agriculture, urbanization, and mining. Recognizing this importance, the present thesis aimed to investigate the main factors influencing the functional diversity of phytoplankton in this region and its response to environmental gradients. Through sampling in different environments, including the Doce River and associated lacustrine ecosystems, the relationships between phytoplankton functional diversity and environmental conditions were analyzed, aiming to understand the community dynamics in response to anthropogenic impacts. The results revealed that the Doce River was more sensitive to seasonal variations, showing greater temporal heterogeneity in environmental conditions. On the other hand, deep lakes exhibited higher functional diversity due to less eutrophic conditions and greater light availability. Moreover, an increase in the functional diversity of the Doce River was observed during the dry season, possibly due to a reduction in anthropogenic pressures on the environment. The analysis of ecological thresholds and functional changes highlighted the influence of environmental factors on the structure and functional dynamics of phytoplankton, with more evident impacts in shallow lakes, indicating a greater vulnerability of these ecosystems to environmental changes of anthropogenic origin However, the current maximum regulatory limits established by CONAMA Resolution 357/2005 for water quality were considerably higher than the points of modification in phytoplankton functional structure, suggesting the need to revise regulatory standards to ensure effective conservation of these ecosystems. Additionally, the study compared the performance of different methods of classifying phytoplankton communities to distinguish environmental gradients levels, highlighting more sensitive responses of the phytoplankton community when organized by taxonomic methods into classes ("CLASS"). Nevertheless, it was noticeable that functional approaches for phytoplankton classification provided an enhanced descriptive capacity of the community across the various levels of each evaluated gradient. In summary, this research contributes to a more comprehensive understanding of the functional ecology of phytoplankton in the Lower Doce River region, providing valuable insights for ecosystem assessments and conservation measures in the region.
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Traços funcionais , Dinâmica do fitoplâncton , Estrutura funcional , Dinâmica funcional , bacia do baixo rio Doce