Grupos Funcionais Fitoplanctônicos Evidenciam Diferenças Ambientais Em Uma Planície De Inundação Temperada

Abstract

Floodplain environments have high biodiversity and provide many ecosystem services maintained by the flood pulses. The phytoplankton is essential to the functioning of these ecosystems, acting upon primary productivity and biogeochemical cycles. We evaluated phytoplankton in a river-lake flood system (Illinois River floodplain-USA) during a hydrological cycle and compared the taxonomic (species) and functional (morphologic-based functional groups – MBFG) approaches. As expected, greater species richness was registered in the river and higher biovolume in the lake, as well as the predominance of different MBFGs in each environment. Furthermore, seasonality drove richness and biovolume temporal variation due to the higher water levels during spring. The MBFG IV (i. e. without specialized traits), V (phytoflagellates) and VI (diatoms) were more important for richness and biovolume in both environments. We reinforce the fundamental role of the hydrodynamics characteristics, with higher phytoplankton biovolume values in the lake. Using MBFG resulted in a better explanation to the phytoplankton-environment relationship. Constant water column mixture and high turbidity selected species with traits (e.g. small size, presence of silica) specifically adapted to these conditions.

Influência de variáveis abióticas sobre os grupos morfofuncionais fitoplanctônicos de um reservatório eutrófico tropical no estado de Pernambuco

“…Condições eutróficas inibem o crescimento de alguns grupos fitoplanctônicos, mas podem favorecer outros, a exemplos dos representantes dos grupos morfofuncionais C, D, F, G, H1, J, K, Lm, M, P, Tc, V, W1, W2, Wo, Ws, X1, X2 e Y. (Barros et al 2017;Zanon et al, 2021;Jacobo et al, 2021;Iatskiu, 2021;Bernales et al, 2022). Este trabalho foi conduzido em um reservatório eutrófico localizado na região metropolitana do Recife (Pernambuco, Brasil).…”