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Determinant variables on the isotopic values of particulate organic matter in a neotropical floodplain

Journal of Oceanology and Limnology 2024年第4期42卷 1173-1185页

作者： Vinícius de ANDRADE URBANO matheus maximilian ratz scoarize Gustavo HENRIQUE ZAIA ALVES Driele DELANIRA-SANTOS Marcela da SILVA CAETANO Evanilde BENEDITO Departamento de Biologia(DBI) Laboratório de Ecologia EnergéticaUniversidade Estadual de Maringá(UEM)Maringá87020-900Brasil Programa de Pós-graduação em Ecologia de Ambientes Aquáticos Continentais(PEA) Universidade Estadual de Maringá(UEM)Maringá87020-900Brasil Departamento de Biologia Geral Universidade Estadual de Ponta Grossa(UEPG)Campus UvaranasPonta Grossa 84030-900Brasil Australian Rivers Institute(ARI) Griffith UniversityNathan QLD 4111Australia

Particulate organic matter(POM)is an important energy source for aquatic consumers,understanding its origin and composition is essential for understanding the energetic dynamics of aquatic *** aim of this study was to analyze the relationship between POM and phytoplankton(isotopic values and chlorophyll concentration)and abiotic variables during dry and rainy *** was conducted in rivers and lagoons in the floodplain of the Upper Paraná*** found a greater difference in ^(δ13)C values of POM between sampling points than between seasons,indicating that the composition of regional sources influences the composition of POM more than dry and rainy *** addition,the concentration of chlorophyll during the dry season was positively correlated with ^(δ13)C values during that rainy ***,we found a relationship between factors limiting the growth of phytoplankton and ^(δ13)C values of POM,such as phosphate ions,indicating that variables that regulate phytoplankton growth tend to influence the composition of POM in river ***,maintaining the variables that regulate the phytoplankton community is of fundamental importance for the composition of POM,an important energy source in aquatic environments.

关键词： freshwater wetland stable isotopes food web subtropical environment

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