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

作　　者：Vinícius de ANDRADE URBANO Matheus MAXIMILIAN RATZ SCOARIZE Gustavo HENRIQUE ZAIA ALVES Driele DELANIRA-SANTOS Marcela da SILVA CAETANO Evanilde BENEDITO 

机构地区：[1]Departamento de Biologia(DBI),Laboratório de Ecologia Energética,Universidade Estadual de Maringá(UEM),Maringá87020-900,Brasil [2]Programa de Pós-graduação em Ecologia de Ambientes Aquáticos Continentais(PEA),Universidade Estadual de Maringá(UEM),Maringá87020-900,Brasil [3]Departamento de Biologia Geral,Universidade Estadual de Ponta Grossa(UEPG),Campus Uvaranas,Ponta Grossa 84030-900,Brasil [4]Australian Rivers Institute(ARI),Griffith University,Nathan QLD 4111,Australia

出　　处：《Journal of Oceanology and Limnology》2024年第4期1173-1185,共13页海洋湖沼学报（英文）

基　　金：Supported by the Research Nucleus in Limnology;Ichthyology and Aquaculture (NUPELIA) for logistic support;the Laboratory of Energetic Ecology and the Long-term Ecological Research Program (PELD/CNPq);Site 6-PIAP (upper ParanáRiver floodplain);PROEX;UEM;and Fundação Araucária for the scholarship

摘　　要：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 environments.The 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 seasons.Sampling was conducted in rivers and lagoons in the floodplain of the Upper ParanáRiver.We 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 seasons.In addition,the concentration of chlorophyll during the dry season was positively correlated with ^(δ13)C values during that rainy period.Additionally,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 floodplains.Therefore,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 

分 类 号：X143[环境科学与工程—环境科学] X17