The Experts below are selected from a list of 2886 Experts worldwide ranked by ideXlab platform
Nathan J Waltham - One of the best experts on this subject based on the ideXlab platform.
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bund removal to re establish tidal flow remove Aquatic Weeds and restore coastal wetland services north queensland australia
PLOS ONE, 2020Co-Authors: Brett N Abbott, Jim Wallace, David M Nicholas, Fazlul Karim, Nathan J WalthamAbstract:The shallow tidal and freshwater coastal wetlands adjacent to the Great Barrier Reef lagoon provide a vital nursery and feeding complex that supports the life cycles of marine and freshwater fish, important native vegetation and vital bird habitat. Urban and agricultural development threaten these wetlands, with many of the coastal wetlands becoming lost or changed due to the construction of artificial barriers (e.g. bunds, roads, culverts and floodgates). Infestation by Weeds has become a major issue within many of the wetlands modified (bunded) for ponded pasture growth last century. A range of expensive chemical and mechanical control methods have been used in an attempt to restore some of these coastal wetlands, with limited success. This study describes an alternative approach to those methods, investigating the impact of tidal reinstatement after bund removal on weed infestation, associated changes in water quality, and fish biodiversity, in the Boolgooroo lagoon region of the Mungalla wetlands, East of Ingham in North Queensland. High resolution remote sensing, electrofishing and in-water logging was used to track changes over time– 1 year before and 4 years after removal of an earth bund. With tides only penetrating the wetland a few times yearly, gross changes towards a more natural system occurred within a relatively short timeframe, leading to a major reduction in infestation of olive hymenachne, water hyacinth and salvina, reappearance of native vegetation, improvements in water quality, and a tripling of fish diversity. Weed abundance and water quality does appear to oscillate however, dependent on summer rainfall, as changes in hydraulic pressure stops or allows tidal ingress (fresh/saline cycling). With an estimated 30% of coastal wetlands bunded in the Great Barrier Reef region, a passive remediation method such as reintroduction of tidal flow by removal of an earth bund or levee could provide a more cost effective and sustainable means of controlling freshwater Weeds and improving coastal water quality into the future.
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bund removal to re establish tidal flow remove Aquatic Weeds and restore coastal wetland services north queensland australia
bioRxiv, 2019Co-Authors: Brett N Abbott, Jim Wallace, David M Nicholas, Fazlul Karim, Nathan J WalthamAbstract:Abstract The shallow tidal and freshwater coastal wetlands adjacent to the Great Barrier Reef lagoon provide a vital nursery and feeding complex that supports the life cycles of marine and freshwater fish, important native vegetation and vital bird habitat. Urban and agricultural development threaten these wetlands, with many of the coastal wetlands becoming lost or changed due to the construction of artificial barriers (e.g. bunds, roads, culverts and floodgates). Infestation by Weeds has become a major issue within many of the wetlands that were modified (bunded) for ponded pasture growth last century. A range of expensive chemical and mechanical control methods has been used to try and restore some of these coastal wetlands, with limited success. This study describes an alternative approach to those methods, investigating the impact of tidal reinstatement after bund removal on weed infestation, associated changes in water quality, and fish biodiversity, in the Boolgooroo lagoon region of the Mungalla wetlands, East of Ingham in North Queensland. High resolution remote sensing, electrofishing and in-water logging was used to track changes over time – 1 year before and 4 years after removal of an earth bund. With tides only penetrating the wetland a few times yearly, gross changes towards a more natural system occurred within a relatively short timeframe, leading to a reduction in weed infestation, reappearance of native vegetation, improvements in water quality, and a tripling of fish diversity. Weed abundance and water quality does appear to oscillate however, dependent on summer rainfall, as changes in hydraulic pressure stops or allows tidal ingress (fresh/saline cycling). With an estimated 30% of coastal wetlands bunded in the Great Barrier Reef region, a passive remediation method such as reintroduction of tidal flow by removal of an earth bund or levee could provide a more cost effective and sustainable means of controlling freshwater Weeds and improving coastal water quality into the future.
Jim Wallace - One of the best experts on this subject based on the ideXlab platform.
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bund removal to re establish tidal flow remove Aquatic Weeds and restore coastal wetland services north queensland australia
PLOS ONE, 2020Co-Authors: Brett N Abbott, Jim Wallace, David M Nicholas, Fazlul Karim, Nathan J WalthamAbstract:The shallow tidal and freshwater coastal wetlands adjacent to the Great Barrier Reef lagoon provide a vital nursery and feeding complex that supports the life cycles of marine and freshwater fish, important native vegetation and vital bird habitat. Urban and agricultural development threaten these wetlands, with many of the coastal wetlands becoming lost or changed due to the construction of artificial barriers (e.g. bunds, roads, culverts and floodgates). Infestation by Weeds has become a major issue within many of the wetlands modified (bunded) for ponded pasture growth last century. A range of expensive chemical and mechanical control methods have been used in an attempt to restore some of these coastal wetlands, with limited success. This study describes an alternative approach to those methods, investigating the impact of tidal reinstatement after bund removal on weed infestation, associated changes in water quality, and fish biodiversity, in the Boolgooroo lagoon region of the Mungalla wetlands, East of Ingham in North Queensland. High resolution remote sensing, electrofishing and in-water logging was used to track changes over time– 1 year before and 4 years after removal of an earth bund. With tides only penetrating the wetland a few times yearly, gross changes towards a more natural system occurred within a relatively short timeframe, leading to a major reduction in infestation of olive hymenachne, water hyacinth and salvina, reappearance of native vegetation, improvements in water quality, and a tripling of fish diversity. Weed abundance and water quality does appear to oscillate however, dependent on summer rainfall, as changes in hydraulic pressure stops or allows tidal ingress (fresh/saline cycling). With an estimated 30% of coastal wetlands bunded in the Great Barrier Reef region, a passive remediation method such as reintroduction of tidal flow by removal of an earth bund or levee could provide a more cost effective and sustainable means of controlling freshwater Weeds and improving coastal water quality into the future.
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bund removal to re establish tidal flow remove Aquatic Weeds and restore coastal wetland services north queensland australia
bioRxiv, 2019Co-Authors: Brett N Abbott, Jim Wallace, David M Nicholas, Fazlul Karim, Nathan J WalthamAbstract:Abstract The shallow tidal and freshwater coastal wetlands adjacent to the Great Barrier Reef lagoon provide a vital nursery and feeding complex that supports the life cycles of marine and freshwater fish, important native vegetation and vital bird habitat. Urban and agricultural development threaten these wetlands, with many of the coastal wetlands becoming lost or changed due to the construction of artificial barriers (e.g. bunds, roads, culverts and floodgates). Infestation by Weeds has become a major issue within many of the wetlands that were modified (bunded) for ponded pasture growth last century. A range of expensive chemical and mechanical control methods has been used to try and restore some of these coastal wetlands, with limited success. This study describes an alternative approach to those methods, investigating the impact of tidal reinstatement after bund removal on weed infestation, associated changes in water quality, and fish biodiversity, in the Boolgooroo lagoon region of the Mungalla wetlands, East of Ingham in North Queensland. High resolution remote sensing, electrofishing and in-water logging was used to track changes over time – 1 year before and 4 years after removal of an earth bund. With tides only penetrating the wetland a few times yearly, gross changes towards a more natural system occurred within a relatively short timeframe, leading to a reduction in weed infestation, reappearance of native vegetation, improvements in water quality, and a tripling of fish diversity. Weed abundance and water quality does appear to oscillate however, dependent on summer rainfall, as changes in hydraulic pressure stops or allows tidal ingress (fresh/saline cycling). With an estimated 30% of coastal wetlands bunded in the Great Barrier Reef region, a passive remediation method such as reintroduction of tidal flow by removal of an earth bund or levee could provide a more cost effective and sustainable means of controlling freshwater Weeds and improving coastal water quality into the future.
R A Pitelli - One of the best experts on this subject based on the ideXlab platform.
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influencia do fotoperiodo e da temperatura na intensidade de doenca causada por fusarium graminearum em egeria densa e e najas
Planta Daninha, 2005Co-Authors: C Borges R Neto, Claudia Q Gorgati, R A PitelliAbstract:A promising Fusarium graminearum isolate has been evaluated as a potential biocontrol agent of two important Aquatic Weeds, Egeria densa and E. najas. This work aimed to study the effects of photoperiod and temperature on the control of these plants under laboratory conditions. The symptons in the plants inoculated with F. graminearum were evaluated every two days, with disease severity being evaluated through a grade scale and plant growth by fresh weight gain, expressed in percentage. The highest severity grades were observed whin both species were kept in the dark and the lowest under 12 hours photoperiod. The temperature of 30 oC provided the higest disease severity for both species. The species E. densa presented the highest fresh mass production under 12 hours of light and at temperatures belou 25 oC, and the lowest production in the dark and at temperature of 30 and 35 oC, while E. najas presented lower fresh mass production in the dark and at temperatures fron 25 to 35 oC.
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influencia do fotoperiodo e da temperatura na intensidade de doenca causada por fusarium graminearum em egeria densa e e najas
Fitopatologia Brasileira, 2004Co-Authors: Carlos Borges R Neto, Claudia Q Gorgati, R A PitelliAbstract:A very promising Fusarium graminearum isolate was evaluated as a potential biocontrol agent for two important submerged Aquatic Weeds, Egeria densa and E. najas. In previous studies, the fungus showed high control of the species and satisfactory specificity. However, under some conditions, the results were unstable, probably due to abiotic factors affecting the pathogenesis. In order to evaluate the influences of the photoperiod (0; 4; 8 and 12 daily hours of light) and temperature (15 oC, 20 oC, 25 oC, 30 oC and 35 oC), studies were carried-out under laboratory conditions in completely randomized plots. The photoperiod effects were evaluated under 25 oC and pH 7,0. The temperature conditions were evaluated after less than 12 h of photoperiod and pH 7,0. The disease severity was evaluated through a note scale and fresh weight variation. The major severity notes were observed as the photoperiod decreased, especially when less than 8 h, and as the temperature increased, especially above 25 oC. There were differences in the plants response to the abiotic factors and the disease development. Egeria densa was more damaged by the fungus in high temperatures as compared to E. najas. Egeria densa was more sensitive to the photoperiod.
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estudo do potencial do pacu piaractus mesopotamicus como agente de controle biologico de egeria densa e najas e ceratophyllum demersum
Planta Daninha, 2003Co-Authors: D M Y Miyazaki, R A PitelliAbstract:In order to provide basic information for the establishment of integrated management systems for submersed Aquatic Weeds in lakes and reservoirs, this research evaluated the efficiency of pacu (Piaractus mesopotamicus) as a biocontrol agent of Egeria densa, E. najas and Ceratophyllum demersum. One, two and the three plant species together were offered to the fish. The average efficacy of this fish to control these plants ranged between 28 and 100%. The fish could eliminate a fresh mass of these plants, equivalent to its body weight, in seven days of predation period. Control efficiency increased with increasing duration of the trials. Pacu is more selective in controlling E. densa or E. najas when in the presence of C. demersum. No decreased efficacy was observed in the control of E. densa or E. najas in any of the treatments nor in any of three time periods studied (3, 5, and 7 days).
Brett N Abbott - One of the best experts on this subject based on the ideXlab platform.
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bund removal to re establish tidal flow remove Aquatic Weeds and restore coastal wetland services north queensland australia
PLOS ONE, 2020Co-Authors: Brett N Abbott, Jim Wallace, David M Nicholas, Fazlul Karim, Nathan J WalthamAbstract:The shallow tidal and freshwater coastal wetlands adjacent to the Great Barrier Reef lagoon provide a vital nursery and feeding complex that supports the life cycles of marine and freshwater fish, important native vegetation and vital bird habitat. Urban and agricultural development threaten these wetlands, with many of the coastal wetlands becoming lost or changed due to the construction of artificial barriers (e.g. bunds, roads, culverts and floodgates). Infestation by Weeds has become a major issue within many of the wetlands modified (bunded) for ponded pasture growth last century. A range of expensive chemical and mechanical control methods have been used in an attempt to restore some of these coastal wetlands, with limited success. This study describes an alternative approach to those methods, investigating the impact of tidal reinstatement after bund removal on weed infestation, associated changes in water quality, and fish biodiversity, in the Boolgooroo lagoon region of the Mungalla wetlands, East of Ingham in North Queensland. High resolution remote sensing, electrofishing and in-water logging was used to track changes over time– 1 year before and 4 years after removal of an earth bund. With tides only penetrating the wetland a few times yearly, gross changes towards a more natural system occurred within a relatively short timeframe, leading to a major reduction in infestation of olive hymenachne, water hyacinth and salvina, reappearance of native vegetation, improvements in water quality, and a tripling of fish diversity. Weed abundance and water quality does appear to oscillate however, dependent on summer rainfall, as changes in hydraulic pressure stops or allows tidal ingress (fresh/saline cycling). With an estimated 30% of coastal wetlands bunded in the Great Barrier Reef region, a passive remediation method such as reintroduction of tidal flow by removal of an earth bund or levee could provide a more cost effective and sustainable means of controlling freshwater Weeds and improving coastal water quality into the future.
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bund removal to re establish tidal flow remove Aquatic Weeds and restore coastal wetland services north queensland australia
bioRxiv, 2019Co-Authors: Brett N Abbott, Jim Wallace, David M Nicholas, Fazlul Karim, Nathan J WalthamAbstract:Abstract The shallow tidal and freshwater coastal wetlands adjacent to the Great Barrier Reef lagoon provide a vital nursery and feeding complex that supports the life cycles of marine and freshwater fish, important native vegetation and vital bird habitat. Urban and agricultural development threaten these wetlands, with many of the coastal wetlands becoming lost or changed due to the construction of artificial barriers (e.g. bunds, roads, culverts and floodgates). Infestation by Weeds has become a major issue within many of the wetlands that were modified (bunded) for ponded pasture growth last century. A range of expensive chemical and mechanical control methods has been used to try and restore some of these coastal wetlands, with limited success. This study describes an alternative approach to those methods, investigating the impact of tidal reinstatement after bund removal on weed infestation, associated changes in water quality, and fish biodiversity, in the Boolgooroo lagoon region of the Mungalla wetlands, East of Ingham in North Queensland. High resolution remote sensing, electrofishing and in-water logging was used to track changes over time – 1 year before and 4 years after removal of an earth bund. With tides only penetrating the wetland a few times yearly, gross changes towards a more natural system occurred within a relatively short timeframe, leading to a reduction in weed infestation, reappearance of native vegetation, improvements in water quality, and a tripling of fish diversity. Weed abundance and water quality does appear to oscillate however, dependent on summer rainfall, as changes in hydraulic pressure stops or allows tidal ingress (fresh/saline cycling). With an estimated 30% of coastal wetlands bunded in the Great Barrier Reef region, a passive remediation method such as reintroduction of tidal flow by removal of an earth bund or levee could provide a more cost effective and sustainable means of controlling freshwater Weeds and improving coastal water quality into the future.
Frank Forcella - One of the best experts on this subject based on the ideXlab platform.
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united states department of agriculture agricultural research service research on pest biology Weeds
Pest Management Science, 2003Co-Authors: Frank ForcellaAbstract:Over 125 permanent full-time scientists conduct research within the USDA Agricultural Research Service (ARS) on issues related to Weeds. The research emphasis of most of these scientists involves ecology and management or biological control of Weeds. Many scientists perform research on weed biology as components of their primary projects on weed control and integrated crop and soil management. Describing all ARS projects involved with weed biology is impossible, and consequently only research that falls within the following arbitrarily chosen topics is highlighted in this article: dormancy mechanisms; cell division; diversity of rangeland Weeds; soil resources and rangeland Weeds; poisonous rangeland plants; horticultural Weeds; weed traits limiting chemical control; Aquatic and semi-Aquatic Weeds; weed/transgenic wheat hybrids; seedbanks, seedling emergence and seedling populations; and weed seed production. Within these topics, and others not highlighted, the desire of ARS is that good information on weed biology currently translates or eventually will translate into practical advice for those who must manage Weeds. Published in 2003 for SCI by John Wiley & Sons, Ltd.