Eichhornia azurea
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publication ID |
https://doi.org/ 10.3906/zoo-1801-48 |
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persistent identifier |
https://treatment.plazi.org/id/F61687B5-FFC0-FFBD-FD68-ABBFFD05F997 |
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treatment provided by |
Felipe |
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scientific name |
Eichhornia azurea |
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3.1. E. azurea View in CoL adventitious root biomass and macroinvertebrate community
In general, the biomass mean values of each root mass varied according to the sampling period. The highest values were recorded in April and July (0.59 g.DW –1 and 0.73 g.DW –1, respectively), and the lowest values in January (0.083 g.DW –1, Figure 4 View Figure 4 ).
Thirty-eight taxa were recorded during the study, and richness ranged from 24 (July) to 34 (April). From the seven taxa classified as rare, three were recorded only in April and two only in October.
Several taxa were observed in all macrophyte stands and periods, as for example Platyhelminthes, Nematoda, Oligochaeta, Ostracoda, Conchostraca, Hydrachnida, Caenidae , Chironomidae , Polycentropodidae , and Hydroptilidae . Some taxa, such as Gomphidae , Leptophlebiidae , Dytiscidae , Noteridae , Belostomatidae , Mesoveliidae , and Veliidae , were rare, occurring only in one of the studied periods.
In relation to the relative contribution (%) of each taxon to the community total abundance (expressed in ind.gDW –1), Oligochaeta presented the highest abundance, followed by Chironomidae ( Figure 5 View Figure 5 ).
The total density of macroinvertebrates recorded in each sampling period presented a significant difference (P <0.05) according to the Kruskal– Wallis analysis. However, the community richness did not differ significantly between months ( Figure 6 View Figure 6 ).
Structural and compositional NMDS and ANOSIM of the macroinvertebrate community showed significant differences among samples and study periods ( Figure 7 View Figure 7 ).
SIMPER analysis showed that Oligochaeta was the most representative taxon in all months, contributing to a similarity from 28.72% (October) to 36.76% (January) of total abundance of the community. Chironomidae was the taxon with the second highest contribution to similarity in all periods (from 24.81% in April to 29.92% in July). According to the SIMPER analysis, the greatest dissimilarity in macroinvertebrates was recorded between April and January (50.45), and the smallest between July and October (36.03).
Linear regressions between root biomass and total density and macroinvertebrate richness showed a trend towards a reduction in the density with an increase in root biomass of E. azurea (R 2 = 0.34), and an increase in richness with an increase in root biomass (R 2 = 0.18).
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