Effects of salinity and nutrients on water hyacinth and its biological control agent, Neochetina bruchi

Bick, Emily; Lange, Elvira S. de; Kron, Cindy R.; Soler, Lorena da Silva; Liu, Jessie; Nguyen, Hoang Danh

doi:10.1007/s10750-020-04314-x

Cited by 14 publications

(7 citation statements)

References 50 publications

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“…In this situation, N. bruchi generated a greater number of progeny, which severely destroyed the E. crassipes (Heard and Winterton, 2000). According to a report by Bick et al (2020), salinity and nutrients that influenced E. crassipes had a significant impact on N. bruchi's life cycle. A factor that has a substantial negative impact on the biocontrol agents has a disproportional detrimental impact on the host plant (Wilson et al, 2005).…”

Section: Effect Of Nutrient Levels Neochetina Bruchi and Neochetina E...mentioning

confidence: 99%

Optimization of Neochetina eichhorniae Warner and Neochetina bruchi Hustache for the management of water hyacinth, Eichhornia crassipes (Mart.) Solms in the Central Rift Valley lakes through the use of different nutrient levels in Ethiopia

Kassu

Getu

Muleta

2022

SEJS

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Water hyacinth, Eichhornia crassipes (Mart.) Solms, is an alien invasive weed in Ethiopia that has been established in freshwater bodies. Eichhornia crassipes negatively affects water transportation, fishing and biodiversity among others. Hence, implementation of eco-friendly management option such as biological control is a mandatory. The weevils, Neochetina eichhorniae Warner and N. bruchi Hustache, are the principal biocontrol agents against E. crassipes in their native ranges and have been introduced to Ethiopia for the management of the weed. The weevils and their host are affected by the nitrate and phosphate contents of the water body. Thus, this study was conducted to investigate the effect of N. bruchi and N. eichhorniae in relation to water nutrient contents in the management of E. crassipes. The experiment was conducted in a randomized complete block design with three replications in a 4x4x3 factorial arrangement. Eight weeks after the treatments’ application, the population of the weevils and E. crassipes growth parameters were recorded. The larval population was significantly (p < 0.05) affected only by the interaction effect of N. bruchi and the nutrient levels. Among the treatments, the highest mean number of larvae was found on the plants given high and medium nutrient levels. There was also a significant interaction (p < 0.05) between the two weevils adult density. The mean number of emerged adult density of the weevils increased with increasing nutrient levels. The nutrients and weevils exhibited a significant interaction effect on E. crassipes leaf scarring and petiole tunnel. Leaf scarring at the highest weevil density and nutrient level was sixfold greater than that at the lower nutrient level and weevil density. The tunnel length of the weed was threefold higher at the highest nutrient level regardless of the weevil density. The growth parameters of E. crassipes were found to be greater at high nutrient level, except for the mean number of flowers. Conversely, the growth parameters showed a non-uniform trend with the increasing density of the weevils. The current result suggests reduction in E. crassipes could be achieved by lowering the water nutrient levels and use of N. bruchi and N. eichhorniae.

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Section: Effect Of Nutrient Levels Neochetina Bruchi and Neochetina E...mentioning

confidence: 99%

Optimization of Neochetina eichhorniae Warner and Neochetina bruchi Hustache for the management of water hyacinth, Eichhornia crassipes (Mart.) Solms in the Central Rift Valley lakes through the use of different nutrient levels in Ethiopia

Kassu

Getu

Muleta

2022

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“…In general, higher temperatures and greater nitrogen and phosphorus content are important factors promoting water hyacinth growth [ 27 , 29 ]. Higher salinity levels inhibit water hyacinth proliferation by inducing growth reduction and an increase in its mortality rate [ 30 ], which hamper invasions in coastal areas. In cases where both salinity and nutrients vary, nutrients will have a greater influence on the leaf count while total biomass remains limited [ 30 ].…”

Section: Water Hyacinth Invasionmentioning

confidence: 99%

“…Higher salinity levels inhibit water hyacinth proliferation by inducing growth reduction and an increase in its mortality rate [ 30 ], which hamper invasions in coastal areas. In cases where both salinity and nutrients vary, nutrients will have a greater influence on the leaf count while total biomass remains limited [ 30 ]. A higher flow velocity reduces the probability that water hyacinth can become established.…”

Section: Water Hyacinth Invasionmentioning

confidence: 99%

Invasive Water Hyacinth: Ecology, Impacts and Prospects for the Rural Economy

Harun

Pushiri

Juhari

et al. 2021

Plants

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Water hyacinth (WH) is notorious for causing severe environmental degradation and being an economic burden to manage. However, it offers substantial prospects if exploited, especially by rural communities. High temperatures, eutrophic conditions and other environmental factors promote the proliferation of the plant in regions where it has been introduced. Regarded as among the world’s worst invasive weeds, WH is nearly impossible to control and eradicate without an integrated approach and community participation. The effectiveness of control methods varies, yet sustained community involvement determines the long-term success of these methods. Reproducing rapidly, WH has the resource capacity to support a unique microeconomic ecosystem, incentivising WH control by generating sustainable income. The WH ecology, the socioeconomic impacts of its invasion and its various applications are reviewed, and revenue generation and cost-saving options are highlighted. A circular microeconomic model is proposed by integrating WH valorisation into the general limitations of a rural community. Empowering locals with opportunities and enticing them with potential economic gains can be a nudge towards a pro-environment behavioural change in managing WH. This would aid in upgrading local livelihoods and could foster resilience within the community in tackling both environmental problems and economic setbacks through the management of WH invasions.

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“…In fact, the warmer temperature induced by climate change has produced a much better circumstance for the plants to grow. In that sense, climate change delivers a positive impact on the growth of water hyacinths, which, however, results in an excessive growth [27,28]. In particular, the sunlight-and nutrient-rich water available in numerous lakes and waterways throughout the tropical zone have further supported the excessive growth of water hyacinth, making it a major problem to regions around the equator [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Technological appropriateness of biomass production in rural settings: Addressing water hyacinths (E. crassipes) problem in Lake Tondano, Indonesia

Pennink

Balsters

et al. 2021

Technology in Society

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Effects of salinity and nutrients on water hyacinth and its biological control agent, Neochetina bruchi

Cited by 14 publications

References 50 publications

Optimization of Neochetina eichhorniae Warner and Neochetina bruchi Hustache for the management of water hyacinth, Eichhornia crassipes (Mart.) Solms in the Central Rift Valley lakes through the use of different nutrient levels in Ethiopia

Optimization of Neochetina eichhorniae Warner and Neochetina bruchi Hustache for the management of water hyacinth, Eichhornia crassipes (Mart.) Solms in the Central Rift Valley lakes through the use of different nutrient levels in Ethiopia

Invasive Water Hyacinth: Ecology, Impacts and Prospects for the Rural Economy

Technological appropriateness of biomass production in rural settings: Addressing water hyacinths (E. crassipes) problem in Lake Tondano, Indonesia

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