Responses of submerged macrophytes Vallisneria natans and epiphytic biofilm to floating plants Eichhornia crassipes in eutrophic water

2021 ◽  
Author(s):  
Chen Zhang ◽  
Qi Li ◽  
Liu Zhan ◽  
Jibiao Zhang
Keyword(s):  
Eichhornia Crassipes ◽  
Submerged Macrophytes ◽  
Vallisneria Natans ◽  
Eutrophic Water ◽  
Floating Plants

scholarly journals Effects of Water Depth on the Growth of the Submerged Macrophytes Vallisneria natans and Hydrilla verticillata: Implications for Water Level Management

Water ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 2590
Author(s):  
Qisheng Li ◽  
Yanqing Han ◽  
Kunquan Chen ◽  
Xiaolong Huang ◽  
Kuanyi Li ◽  
...  
Keyword(s):  
Water Level ◽  
Water Depth ◽  
Deep Water ◽  
Submerged Macrophytes ◽  
Hydrilla Verticillata ◽  
Water Level Fluctuations ◽  
Total Biomass ◽  
Intermediate Water ◽  
Factors Affecting ◽  
Vallisneria Natans

Water level is one of the most important factors affecting the growth of submerged macrophytes in aquatic ecosystems. The rosette plant Vallisneria natans and the erect plant Hydrilla verticillata are two common submerged macrophytes in lakes of the middle and lower reaches of the Yangtze River, China. How water level fluctuations affect their growth and competition is still unknown. In this study, three water depths (50 cm, 150 cm, and 250 cm) were established to explore the responses in growth and competitive patterns of the two plant species to water depth under mixed planting conditions. The results show that, compared with shallow water conditions (50 cm), the growth of both submerged macrophytes was severely suppressed in deep water depth (250 cm), while only V. natans was inhibited under intermediate water depth (150 cm). Moreover, the ratio of biomass of V. natans to H. verticillata gradually increased with increasing water depth, indicating that deep water enhanced the competitive advantage of V. natans over H.verticillata. Morphological adaptation of the two submerged macrophytes to water depth was different. With increasing water depth, H. verticillata increased its height, at the cost of reduced plant numbers to adapt to poor light conditions. A similar strategy was also observed in V. natans, when water depth increased from 50 cm to 150 cm. However, both the plant height and number were reduced at deep water depth (250 cm). Our study suggests that water level reduction in lake restoration efforts could increase the total biomass of submerged macrophytes, but the domination of key plants, such as V. natans, may decrease.

Response of the submerged macrophytes Vallisneria natans to snails at different densities

2020 ◽  
Vol 194 ◽  
pp. 110373
Author(s):  
Hao Zhang ◽  
Xin Luo ◽  
Qi Li ◽  
Suzhen Huang ◽  
Ning Wang ◽  
...  
Keyword(s):  
Submerged Macrophytes ◽  
Vallisneria Natans

scholarly journals Aquatic macrophytes of Itaipu Reservoir, Brazil: survey of species and ecological considerations

1999 ◽  
Vol 42 (1) ◽  
Author(s):  
Sidinei Magela Thomaz ◽  
Luis Maurício Bini ◽  
Maria Conceição de Souza ◽  
Kazue Kawakita Kita ◽  
Antonio Fernando Monteiro Camargo
Keyword(s):  
Eichhornia Crassipes ◽  
Aquatic Macrophytes ◽  
Submerged Macrophytes ◽  
Pistia Stratiotes ◽  
Light Penetration ◽  
Nutrient Input ◽  
Emergent Macrophytes ◽  
Nuisance Species ◽  
Shallow Area ◽  
Egeria Najas

In a survey of the aquatic macrophytes of the Itaipu Reservoir, we identified 62 taxa in 25 families and 42 genera. The highest number taxa was observed for the emergent macrophytes (40 taxa). Reduced fluctuation in water level, increased light penetration, and sediment enrichment by nutrients and organic matter following the formation of the reservoir favored the appearance of a species-rich community of submerged macrophytes (23% of the taxa identified). The aquatic macrophytes were found mainly near the mouths of the main tributaries of the reservoir, in shallow area of depth less than 2 meters. In addition to the shallow depth, the greater nutrient input from the tributaries and relative protection from wind explained this distribution. Among the species found, Egeria najas merits mention for its occurrence in all localities sampled, with biomass values varying between 98 and 186 gDW/m². Some potential nuisance species such as Eichhornia crassipes, Salvinia auriculata, and Pistia stratiotes also deserve attention, since they were also observed to be covering large areas of Itaipu Reservoir.

Fate of 15 NO3 − and 15 NH4 + in the Treatment of Eutrophic Water Using the Floating Macrophyte, Eichhornia crassipes

2012 ◽  
Vol 41 (5) ◽  
pp. 1653-1660 ◽  
Author(s):  
Yan Gao ◽  
Neng Yi ◽  
Zhiyong Zhang ◽  
Haiqin Liu ◽  
Shaohua Yan
Keyword(s):  
Eichhornia Crassipes ◽  
Eutrophic Water ◽  
Floating Macrophyte
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