Aquatic weed control

Gutiérrez, Eric; Arreguín, Felipe; Huerto, Rubén; Saldaña, Pilar

doi:10.1080/07900629408722631

Cited by 19 publications

(15 citation statements)

References 4 publications

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“…Our results disagree with the report by Gutiérrez et al (1994), in which the authors reported no changes on plankton, benthos, or fish after hyacinth removal, but it should be pointed out that they used mostly chemical control rather than triturating. Although results by Lugo et al (1998) indicated an important shift on planktonic communities after use of chemicals, and a rapid recovery, the high nutrient load of the system continued in the same way.…”

Section: Discussioncontrasting

confidence: 83%

“…Among the main problems caused by this phenomenon are the obstruction of irrigation channels, favoring development of harmful fauna of mosquitoes, obstructing navigation, and so on. In spite of all these problems, perhaps the major impact of water hyacinth is through In Mexico, removal of freshwater weeds is usually by means of herbicides, through mechanical trituration, or by biological control, with emphasis on the first two methods (Gutiérrez et al, 1994). Most commonly, there are no monitoring programs to evaluate the post-trituration effects on the aquatic environment.…”

Section: Introductionmentioning

confidence: 98%

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Effect of mechanical removal of water hyacinth (Eichhornia crassipes) on the water quality and biological communities in a Mexican reservoir

Mangas-Ramírez

Elías‐Gutiérrez

2004

Aquatic Ecosystem Health &Amp; Management

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The Valsequillo reservoir, located near the city of Puebla, Mexico, is a hard-water eutrophic subtropical system, with minimum temperatures in winter (November-December), and marked dry-rain seasons with fluctuating depth. The reservoir has been infested with water hyacinth for over three decades. A management program involving the use of triturating machines was applied from December 1996 to February 1997. After trituration, remains were allowed to settle to the bottom. The purpose of this study was to monitor the changes in the water quality and the biological communities before and after physical control of weeds. A monthly sampling of surface water was performed at four stations one year before the treatment. After trituration, one year sampling was also carried out. Variables measured included temperature, Secchi disk transparency, depth, pH, dissolved oxygen, oxygen saturation, hardness, nitrate content, nitrite content, ammonia, orthophosphates, and numerical abundance of phytoplankton, zooplankton, and nekton.Weed control affected changes in all variables measured, as a result of residual decomposition of triturated matter. Secchi transparency and oxygen levels decreased and pH became slightly more alkaline. More important changes occurred for nutrients. Orthophosphate concentration increased, for nitrate and nitrite, increase was about 320% and 450% respectively. Ammonia reached lethal values for at least four months after trituration. As a result, phytoplankton decreased initially, and when it flourished again, the Bacillariophyta were replaced by Cyanophyta. Euglenophyta were important in both years. Of zooplankton, calanoids decreased, but cyclopoids and cladocerans maintained similar numbers, although the latter group changed in composition in that Ceriodaphnia was replaced by Moina. Fish disappeared from the system after weed trituration. In the second year a small recovery of water quality occurred, but water hyacinth also started to develop again. At present, Valsequillo is again covered by water hyacinth.

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Section: Discussioncontrasting

confidence: 83%

Section: Introductionmentioning

confidence: 98%

Effect of mechanical removal of water hyacinth (Eichhornia crassipes) on the water quality and biological communities in a Mexican reservoir

Mangas-Ramírez

Elías‐Gutiérrez

2004

Aquatic Ecosystem Health &Amp; Management

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“…Tolerance ends where aquatic macrophytes interfere with the activities of the group, especially when economic interests are impaired. This is the case where swimming, boating and other recreational activities suffer from aquatic macrophytes or when the recreational value of a tourist attraction is compromised by the smell of rotting plants (Gutiérrez et al 1994). …”

Section: -Tourism and Recreationmentioning

confidence: 99%

Nature Conservation Against All? Aquatic Macrophyte De-Weeding – Cut or Conserve? A Stakeholder Analysis

Brummer

Roth

Röhl

et al. 2017

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De-weeding of streams and lakes occurs in Germany on a widespread level, mostly to ensure water runoff and to provide flood protection. But de-weeding also affects a range of stakeholders, who have their own reasons to support or oppose it. For the list of stakeholders identified, see chapter 4. As part of a project analysing the feasibility of using water plant biomass as a substrate for biogas production, we conducted a multi-method stakeholder analysis to evaluate stakeholders' opinions about de-weeding. The results show a preference of all stakeholders, except those identifying with nature conservation, for aquatic de-weeding. Our findings also point to a lack of communication between stakeholders, resulting in biased opinions of the stakeholders against other stakeholders and starting points for conflict.

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“…early 1900s [3]. Chemical and mechanical control methods have been used to manage water hyacinth, but these methods have expensive and unsatisfactory results, because repeated applications have been needed [2]. This lack of control is due to the weed's rapid growth rate and its ability to re-infest via the seed bank or by flood-borne plants.…”

mentioning

confidence: 99%

“…The beauty of water hyacinth flowers led to the plant's introduction into many countries as a decorative plant and finally its conversion into a weed in response to high level of nutrients in water bodies due to urban, industrial and municipal wastewater discharges [1]. In México, water hyacinth is the most important exotic aquatic plant-more than 40,000 ha of reservoirs, lakes, canals and drains are infested with water hyacinth [2]. This weed was probably introduced in México in the Corresponding author: Martínez Jiménez Maricela, Ph.D., research field: aquatic ecosystems.…”

mentioning

confidence: 99%

Evaluation of Sunlight and Humidity Protection of a Bioherbicide for Eichornia crassipes Biocontrol

Maricela¹,

Antonieta²,

Fabela³

2015

JESE-B

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C. piaropi (Cercospora piaropi) and A. zonatum (Acremonium zonatum) have proved to be effective in reducing water hyacinth growth. However, efficacy of these fungi in field is limited by the effect of solar UV (ultraviolet) light and desiccation. In this study, three compounds used as sunscreens and one seed plant that produce mucilage were tested for their effects on the infection produced by C. piaropi and A. zonatum inoculum under laboratory and field conditions. In laboratory conditions, TiO 2 (titanium dioxide) and metamucil did not inhibit C. piaropi and A. zonatum viability. Moreover, the addition of TiO 2 and metamucil to the inoculum suspension increased fungi infection. The protective effect of TiO 2 and metamucil was more evident when the inoculum suspension was applied 4 h before sunset. These results suggest that addition of TiO 2 and metamucil provides necessary humidity and solar protection for increasing C. piaropi and A. zonatum infection on water hyacinth plants.

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Aquatic weed control

Cited by 19 publications

References 4 publications

Effect of mechanical removal of water hyacinth (Eichhornia crassipes) on the water quality and biological communities in a Mexican reservoir

Effect of mechanical removal of water hyacinth (Eichhornia crassipes) on the water quality and biological communities in a Mexican reservoir

Nature Conservation Against All? Aquatic Macrophyte De-Weeding – Cut or Conserve? A Stakeholder Analysis

Evaluation of Sunlight and Humidity Protection of a Bioherbicide for Eichornia crassipes Biocontrol

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