scholarly journals Effects of water depth on growth of submerged macrophytes Vallisneria natans and Myriophyllum spicatum

2019 ◽  
Vol 31 (4) ◽  
pp. 1045-1054
Author(s):  
LI Qisheng ◽  
◽  
HUANG Qiang ◽  
LI Yongji ◽  
HAN Yanqing ◽  
...  
Keyword(s):  
Water Depth ◽  
Submerged Macrophytes ◽  
Myriophyllum Spicatum ◽  
Vallisneria Natans

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.

Responses of the submerged macrophyte Vallisneria natans to a water depth gradient

2020 ◽  
Vol 701 ◽  
pp. 134944 ◽  
Author(s):  
Huimin Li ◽  
Qi Li ◽  
Xin Luo ◽  
Jie Fu ◽  
Jibiao Zhang
Keyword(s):  
Water Depth ◽  
Submerged Macrophyte ◽  
Depth Gradient ◽  
Vallisneria Natans

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 The Response of Regeneration Ability of Myriophyllum spicatum Apical Fragments to Decaying Cladophora oligoclona

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 1014 ◽  
Author(s):  
Lu Zhang ◽  
Suzhen Huang ◽  
Xue Peng ◽  
Biyun Liu ◽  
Yi Zhang ◽  
...  
Keyword(s):  
Submerged Macrophytes ◽  
Sugar Content ◽  
Myriophyllum Spicatum ◽  
Life History Strategy ◽  
Regeneration Ability ◽  
Filamentous Green Algae ◽  
Related Enzyme ◽  
Early Regeneration ◽  
Physiological And Biochemical ◽  
Eutrophic Shallow Lakes

During the restoration of eutrophic shallow lakes, submerged macrophyte recovery is often accompanied by an excessive proliferation of filamentous green algae (FGA). This can lead to the recession or even disappearance of the submerged macrophytes in these lakes. However, the use of plant fragments in reproduction and dispersion is an important life history strategy for submerged macrophytes. In this work, it studied apical fragment propagation in Myriophyllum spicatum and its physiological and biochemical responses to the decomposing liquid of Cladophora oligoclona. Myriophyllum spicatum apical fragments showed no new roots or buds when treated with 0.4 times the original decomposing liquid, and their PSII functional parameters were lower than those of the control. In contrast, the relevant sugar content accumulated to 115.26%, and the activities of an energy enzyme (Ca2+/Mg2+-ATPase) and a secondary metabolic-related enzyme (PAL) increased by 490.63% and 28.13%, showing an elevated defense response. These results indicated that the early regeneration of M. spicatum could be hindered by environmental stress, and that this may further affect the reproduction and colonization of these submerged macrophytes.

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