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DATE: 28/01/2022
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Diversity of Arbuscular Mycorrhizal Fungi (Glomeromycota) in lentic and lotic aquatic ecosystems of Rio Grande do Norte, Brazil


Aquatic macrophytes. Depth. Mycorrhiza. Seasonality. Taxonomic inventories.

BIG AREA: Ciências Biológicas
AREA: Botânica
SUBÁREA: Taxonomia Vegetal
SPECIALTY: Taxonomia de Criptógamos

Arbuscular Mycorrhizal Fungi (AMF) are symbiotic microorganisms from terrestrial and aquatic plant roots. However, lentic and lotic aquatic ecosystems are little explored regarding their occurrence and ecology. Few diversity inventories have documented more than 100 species and ecological studies have tested the influence of environmental variables on the degree of root colonization, but the structure of AMF communities under these two conditions and of the influence of environmental variables is poorly known. The objective of this work was to inventory the AMF species in two lentic environments (Carcará and Arituba Lagoons) and two lotic environments (Boa Cica Stream and Pium River) in the municipality of Nísia Floresta, Rio Grande do Norte, Brazil, and evaluate the influence of water and seasonal parameters on species composition, diversity, richness, and sporulation. For this, two samples were taken in the dry (December 2016) and wet (July 2017) periods, removing rhizospheric soils of different species of macrophytes inhabiting depths from 0.02 to 2.72 m. Glomerospores were extracted from 50 g of soil and mounted on slides for taxonomic identification. Species were evaluated for frequency of occurrence and relative abundance, being later classified as dominant, common, and rare. Differences in the composition of the species were tested by Cluster Analysis, ANOSIM, and SIMPER. Diversity was evaluated between conditions and seasons using rarefaction curves interpolated and extrapolated to Hill numbers. Richness and sporulation were tested in relation to conditions, seasons, and depth by Generalized Linear Models and ANOVA. Eighty-eight species were identified distributed in 5 orders, 11 families, and 21 genera. Sixty-one species occurred in the lentic condition and 55 in the lotic condition, with 26 of them shared by the two conditions. Glomeraceae and Acaulosporaceae were the most representative families in species richness in all lentic and lotic interactions and species abundance in lotic interactions, while the Ambisporaceae family showed high abundance in lentic interactions. Species composition differed significantly between conditions. The Simpson's Diversity Index differed between lentic and lotic interactions, with greater diversity associated with lentic interactions. The Shannon diversity index was different between the lentic/dry and lotic/rainy interactions, which also corresponded to greater and lesser diversity, respectively. Species richness and sporulation differed between conditions and were influenced by depth in the lentic/dry interaction. The results of this work show the potential of aquatic ecosystems to harbour high AMF richness and suggest that the structure of communities is influenced by lentic and lotic conditions, and depth of the water column.

Presidente - 1755051 - BRUNO TOMIO GOTO
Externa à Instituição - KHADIJA JOBIM - IDEMA
Notícia cadastrada em: 11/01/2022 11:39
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