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Shuwei Liu - One of the best experts on this subject based on the ideXlab platform.
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annual methane and nitrous oxide emissions from rice Paddies and inland fish aquaculture wetlands in southeast china
Atmospheric Environment, 2018Co-Authors: Jie Chen, Jianwen Zou, Shuwei LiuAbstract:Abstract Inland aquaculture ponds have been documented as important sources of atmospheric methane (CH4) and nitrous oxide (N2O), while their regional or global source strength remains unclear due to lack of direct flux measurements by covering more typical habitat-specific aquaculture environments. In this study, we compared the CH4 and N2O fluxes from rice Paddies and nearby inland fish aquaculture wetlands that were converted from rice Paddies in southeast China. Both CH4 and N2O fluxes were positively related to water temperature and sediment dissolved organic carbon, but negatively related to water dissolved oxygen concentration. More robust response of N2O fluxes to water mineral N was observed than to sediment mineral N. Annual CH4 and N2O fluxes from inland fish aquaculture averaged 0.51 mg m−2 h−1 and 54.78 μg m−2 h−1, amounting to 42.31 kg CH4 ha−1 and 2.99 kg N2O-N ha−1, respectively. The conversion of rice Paddies to conventional fish aquaculture significantly reduced CH4 and N2O emissions by 23% and 66%, respectively. The emission factor for N2O was estimated to be 0.46% of total N input in the feed or 1.23 g N2O-N kg−1 aquaculture production. The estimate of sustained-flux global warming potential of annual CH4 and N2O emissions and the net economic profit suggested that such conversion of rice Paddies to inland fish aquaculture would help to reconcile the dilemma for simultaneously achieving both low climatic impacts and high economic benefits in China. More solid direct field measurements from inland aquaculture are in urgent need to direct the overall budget of national or global CH4 and N2O fluxes.
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methane and nitrous oxide emissions reduced following conversion of rice Paddies to inland crab fish aquaculture in southeast china
Environmental Science & Technology, 2016Co-Authors: Shuwei Liu, Jianwen ZouAbstract:Aquaculture is an important source of atmospheric methane (CH4) and nitrous oxide (N2O), while few direct flux measurements are available for their regional and global source strength estimates. A parallel field experiment was performed to measure annual CH4 and N2O fluxes from rice Paddies and rice paddy-converted inland crab–fish aquaculture wetlands in southeast China. Besides N2O fluxes dependent on water/sediment mineral N and CH4 fluxes related to water chemical oxygen demand, both CH4 and N2O fluxes from aquaculture were related to water/sediment temperature, sediment dissolved organic carbon, and water dissolved oxygen concentration. Annual CH4 and N2O fluxes from inland aquaculture averaged 0.37 mg m–2 h–1 and 48.1 μg m–2 h–1, yielding 32.57 kg ha–1 and 2.69 kg N2O–N ha–1, respectively. The conversion of rice Paddies to aquaculture significantly reduced CH4 and N2O emissions by 48% and 56%, respectively. The emission factor for N2O was estimated to be 0.66% of total N input in the feed or 1.64 g ...
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a comparison of methane emissions following rice Paddies conversion to crab fish farming wetlands in southeast china
Environmental Science and Pollution Research, 2016Co-Authors: Jianwen Zou, Quansuo Zhou, Shuwei LiuAbstract:Rice Paddies and aquaculture wetlands are typical agricultural wetlands that constitute one of the important sources of atmospheric methane (CH4). Traditional transplanted rice Paddies have been experiencing conversion to pond aquaculture wetlands for pursuing higher economic benefits over the past decades in southeast China. A parallel field experiment was carried out to compare CH4 emissions from a transplanted rice paddy and its converted crab-fish farming wetland in southeast China. Over the rice-growing season, CH4 fluxes averaged 1.86 mg m(-2) h(-1) from rice Paddies, and 1.14 and 0.50 mg m(-2) h(-1) for the treatments with or without aquatic vegetation present in the crab-fish farming wetlands, respectively. When averaged across the treatments, seasonal CH4 emissions from crab-fish framing wetlands were 52% lower than those from rice Paddies. The CH4 fluxes were negatively related to water dissolved oxygen (DO) concentration but positively related to soil/sediment dissolved organic carbon (DOC) content in crab-fish farming wetlands. Dependence of CH4 fluxes on DO or DOC was intensified by the aquatic vegetation presence. By extrapolating the present CH4 emission rate with the current rice paddy-converted aquaculture cultivation area, the seasonal CH4 emissions from inland aquaculture wetlands during the critical farming stage (20 June to 18 October) were estimated to be 33.6 Gg ha(-1) in southeast China in 2012. Rice Paddies conversion to crab-fish farming wetlands might have reduced CH4 emissions by 22-54% in mainland China. Results of this study suggest that the conversion of transplanted rice Paddies to crab-fish aquaculture wetlands for higher economic benefits would also lead to a lower ecosystem CH4 release rate.
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methane and nitrous oxide emissions from direct seeded and seedling transplanted rice Paddies in southeast china
Plant and Soil, 2014Co-Authors: Shuwei Liu, Yaojun Zhang, Feng Lin, Ling Zhang, Jianwen ZouAbstract:Background and aims The rice production is experiencing a shift from conventionally seedling-transplanted (TPR) to direct-seeded (DSR) cropping systems in Southeast Asia. Besides the difference in rice crop establishment, water regime is typically characterized as water-saving moist irrigation for DSR and flooding-midseason drainage-reflooding and moist irrigation for TPR fields, respectively. A field experiment was conducted to quantify methane (CH4) and nitrous oxide (N2O) emissions from the DSR and TPR rice Paddies in southeast China.
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sewage irrigation increased methane and nitrous oxide emissions from rice Paddies in southeast china
Agriculture Ecosystems & Environment, 2009Co-Authors: Jianwen Zou, Shuwei Liu, Yanmei Qin, Genxing Pan, Dawei ZhuAbstract:Abstract Greenhouse gas emissions from rice Paddies under sewage irrigation deserve much attention since domestic sewage effluents are increasingly used for agriculture in developing countries. A field experiment was conducted to simultaneously measure methane (CH4) and nitrous oxide (N2O) emissions from rice (Oryza sativa L.) Paddies under sewage and unpolluted river water irrigation in southeast China. The rice Paddies were under a local typical water regime, which was characterized by flooding–midseason drainage–reflooding–moist intermittent irrigation but without water logging. Relative to unpolluted river water irrigation, sewage irrigation significantly increased CH4 and N2O emissions from rice Paddies. Seasonal fluxes of CH4 averaged 1.51 mg m−2 h−1 for the plots irrigated by river water and 1.92 mg m−2 h−1 for the plots irrigated by sewage. In contrast with river water irrigation, sewage irrigation increased CH4 by 27% and 33% for paddy plots with and without chemical N addition, respectively. Under sewage irrigation, seasonal fluxes of N2O-N averaged 26.79 μg m−2 h−1 for the plots without N application and 74.07 μg m−2 h−1 for the plots applied at the rate of 200 kg N ha−1. Relative to river water irrigation, sewage irrigation increased N2O by 68% and 170% for the plots with and without N application, respectively. The direct emission factor of fertilizer N for N2O was estimated to be 0.71% for the rice Paddies under sewage irrigation and 0.52% for the plots irrigated by river water. Besides direct N2O emissions, N input by sewage irrigation induced substantial indirect N2O emission from rice Paddies. The results of the net GWPs from CH4 and N2O indicate that sewage irrigation would intensify the radiative forcing of rice Paddies with midseason drainage and moist irrigation.
Jianwen Zou - One of the best experts on this subject based on the ideXlab platform.
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annual methane and nitrous oxide emissions from rice Paddies and inland fish aquaculture wetlands in southeast china
Atmospheric Environment, 2018Co-Authors: Jie Chen, Jianwen Zou, Shuwei LiuAbstract:Abstract Inland aquaculture ponds have been documented as important sources of atmospheric methane (CH4) and nitrous oxide (N2O), while their regional or global source strength remains unclear due to lack of direct flux measurements by covering more typical habitat-specific aquaculture environments. In this study, we compared the CH4 and N2O fluxes from rice Paddies and nearby inland fish aquaculture wetlands that were converted from rice Paddies in southeast China. Both CH4 and N2O fluxes were positively related to water temperature and sediment dissolved organic carbon, but negatively related to water dissolved oxygen concentration. More robust response of N2O fluxes to water mineral N was observed than to sediment mineral N. Annual CH4 and N2O fluxes from inland fish aquaculture averaged 0.51 mg m−2 h−1 and 54.78 μg m−2 h−1, amounting to 42.31 kg CH4 ha−1 and 2.99 kg N2O-N ha−1, respectively. The conversion of rice Paddies to conventional fish aquaculture significantly reduced CH4 and N2O emissions by 23% and 66%, respectively. The emission factor for N2O was estimated to be 0.46% of total N input in the feed or 1.23 g N2O-N kg−1 aquaculture production. The estimate of sustained-flux global warming potential of annual CH4 and N2O emissions and the net economic profit suggested that such conversion of rice Paddies to inland fish aquaculture would help to reconcile the dilemma for simultaneously achieving both low climatic impacts and high economic benefits in China. More solid direct field measurements from inland aquaculture are in urgent need to direct the overall budget of national or global CH4 and N2O fluxes.
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methane and nitrous oxide emissions reduced following conversion of rice Paddies to inland crab fish aquaculture in southeast china
Environmental Science & Technology, 2016Co-Authors: Shuwei Liu, Jianwen ZouAbstract:Aquaculture is an important source of atmospheric methane (CH4) and nitrous oxide (N2O), while few direct flux measurements are available for their regional and global source strength estimates. A parallel field experiment was performed to measure annual CH4 and N2O fluxes from rice Paddies and rice paddy-converted inland crab–fish aquaculture wetlands in southeast China. Besides N2O fluxes dependent on water/sediment mineral N and CH4 fluxes related to water chemical oxygen demand, both CH4 and N2O fluxes from aquaculture were related to water/sediment temperature, sediment dissolved organic carbon, and water dissolved oxygen concentration. Annual CH4 and N2O fluxes from inland aquaculture averaged 0.37 mg m–2 h–1 and 48.1 μg m–2 h–1, yielding 32.57 kg ha–1 and 2.69 kg N2O–N ha–1, respectively. The conversion of rice Paddies to aquaculture significantly reduced CH4 and N2O emissions by 48% and 56%, respectively. The emission factor for N2O was estimated to be 0.66% of total N input in the feed or 1.64 g ...
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a comparison of methane emissions following rice Paddies conversion to crab fish farming wetlands in southeast china
Environmental Science and Pollution Research, 2016Co-Authors: Jianwen Zou, Quansuo Zhou, Shuwei LiuAbstract:Rice Paddies and aquaculture wetlands are typical agricultural wetlands that constitute one of the important sources of atmospheric methane (CH4). Traditional transplanted rice Paddies have been experiencing conversion to pond aquaculture wetlands for pursuing higher economic benefits over the past decades in southeast China. A parallel field experiment was carried out to compare CH4 emissions from a transplanted rice paddy and its converted crab-fish farming wetland in southeast China. Over the rice-growing season, CH4 fluxes averaged 1.86 mg m(-2) h(-1) from rice Paddies, and 1.14 and 0.50 mg m(-2) h(-1) for the treatments with or without aquatic vegetation present in the crab-fish farming wetlands, respectively. When averaged across the treatments, seasonal CH4 emissions from crab-fish framing wetlands were 52% lower than those from rice Paddies. The CH4 fluxes were negatively related to water dissolved oxygen (DO) concentration but positively related to soil/sediment dissolved organic carbon (DOC) content in crab-fish farming wetlands. Dependence of CH4 fluxes on DO or DOC was intensified by the aquatic vegetation presence. By extrapolating the present CH4 emission rate with the current rice paddy-converted aquaculture cultivation area, the seasonal CH4 emissions from inland aquaculture wetlands during the critical farming stage (20 June to 18 October) were estimated to be 33.6 Gg ha(-1) in southeast China in 2012. Rice Paddies conversion to crab-fish farming wetlands might have reduced CH4 emissions by 22-54% in mainland China. Results of this study suggest that the conversion of transplanted rice Paddies to crab-fish aquaculture wetlands for higher economic benefits would also lead to a lower ecosystem CH4 release rate.
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methane and nitrous oxide emissions from direct seeded and seedling transplanted rice Paddies in southeast china
Plant and Soil, 2014Co-Authors: Shuwei Liu, Yaojun Zhang, Feng Lin, Ling Zhang, Jianwen ZouAbstract:Background and aims The rice production is experiencing a shift from conventionally seedling-transplanted (TPR) to direct-seeded (DSR) cropping systems in Southeast Asia. Besides the difference in rice crop establishment, water regime is typically characterized as water-saving moist irrigation for DSR and flooding-midseason drainage-reflooding and moist irrigation for TPR fields, respectively. A field experiment was conducted to quantify methane (CH4) and nitrous oxide (N2O) emissions from the DSR and TPR rice Paddies in southeast China.
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sewage irrigation increased methane and nitrous oxide emissions from rice Paddies in southeast china
Agriculture Ecosystems & Environment, 2009Co-Authors: Jianwen Zou, Shuwei Liu, Yanmei Qin, Genxing Pan, Dawei ZhuAbstract:Abstract Greenhouse gas emissions from rice Paddies under sewage irrigation deserve much attention since domestic sewage effluents are increasingly used for agriculture in developing countries. A field experiment was conducted to simultaneously measure methane (CH4) and nitrous oxide (N2O) emissions from rice (Oryza sativa L.) Paddies under sewage and unpolluted river water irrigation in southeast China. The rice Paddies were under a local typical water regime, which was characterized by flooding–midseason drainage–reflooding–moist intermittent irrigation but without water logging. Relative to unpolluted river water irrigation, sewage irrigation significantly increased CH4 and N2O emissions from rice Paddies. Seasonal fluxes of CH4 averaged 1.51 mg m−2 h−1 for the plots irrigated by river water and 1.92 mg m−2 h−1 for the plots irrigated by sewage. In contrast with river water irrigation, sewage irrigation increased CH4 by 27% and 33% for paddy plots with and without chemical N addition, respectively. Under sewage irrigation, seasonal fluxes of N2O-N averaged 26.79 μg m−2 h−1 for the plots without N application and 74.07 μg m−2 h−1 for the plots applied at the rate of 200 kg N ha−1. Relative to river water irrigation, sewage irrigation increased N2O by 68% and 170% for the plots with and without N application, respectively. The direct emission factor of fertilizer N for N2O was estimated to be 0.71% for the rice Paddies under sewage irrigation and 0.52% for the plots irrigated by river water. Besides direct N2O emissions, N input by sewage irrigation induced substantial indirect N2O emission from rice Paddies. The results of the net GWPs from CH4 and N2O indicate that sewage irrigation would intensify the radiative forcing of rice Paddies with midseason drainage and moist irrigation.
Amael Borzee - One of the best experts on this subject based on the ideXlab platform.
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Interspecific Variation in Seasonal Migration and Brumation Behavior in Two Closely Related Species of Treefrogs
Frontiers Media S.A., 2019Co-Authors: Amael Borzee, Yoojin Choi, Ye Eun Kim, Piotr G. Jablonski, Yikweon JangAbstract:Most amphibians migrate between flooded habitats for breeding and dry habitats for non-breeding activities, however, differences in closely related species may highlight divergent evolutionary histories. Through field surveys, Harmonic Direction Finder tracking and laboratory behavioral experiments during the wintering season, we demonstrated differences in seasonal migration and hibernation habitats between Dryophytes suweonensis and D. japonicus. We found that D. japonicus migrated toward forests for overwintering and then back to rice Paddies for breeding in spring. By contrast, D. suweonensis was found to hibernate buried in the vicinity of rice Paddies, its breeding habitat. We also found that the difference in migrating behavior matched with variation in microhabitat use during brumation and hibernation between the two species. Our findings highlight different ecological requirements between the two species, which may result from their segregated evolutionary histories, with speciation potentially linked to species use of a new breeding habitat. Additionally, the use of rice Paddies for both breeding and hibernation may contribute to the endangered status of D. suweonensis because of the degradation of hibernation sites in winter
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Policy Recommendation for the Conservation of the Suweon Treefrog (Dryophytes suweonensis) in the Republic of Korea
Frontiers Media S.A., 2019Co-Authors: Amael Borzee, Yikweon JangAbstract:The Suweon treefrog (Dryophytes suweonensis) is an endangered species with an important evolutionary significance. However, the current rate of decline projects the extinction of the species within a few decades in the Republic of Korea. The species is presently exclusively inhabiting rice Paddies and is not present in any protected area, although it would be relatively easy to designate protected area under the RAMSAR convention and correct the current negative population dynamics. Through three policy recommendations, we present the points of importance for the conservation of the Suweon Treefrog, list the site of importance for its conservation, and introduce an agricultural model allowing for the conservation of the species as well as continued rice production and economic income.Actionable recommendations: - Establishment of protected areas within the range of D. suweonensis- Pesticide and herbicide ban in rice-paddy complexes where D. suweonensis occurs- Vegetation mowing limit for surroundings of rice Paddies where D. suweonensis occurs
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relationship between agro environmental variables and breeding hylids in rice Paddies
Scientific Reports, 2018Co-Authors: Amael Borzee, Kyongman Heo, Yikweon JangAbstract:When natural wetlands are destroyed, many anuran species are forced to breed in alternative habitats such as rice Paddies. We conducted field surveys for the endangered Dryophytes suweonensis and the numerous D. japonicus, from the beginning of the breeding season until two weeks after its peak. We recorded the presence, number of individuals and calling indices for each species. We hypothesized that D. japonicus would start breeding earlier than D. suweonensis, which would have originally been breeding solely in floodplains. The results of our analyses demonstrate that the rice cultivation phase was the most important factor in predicting the calling activities of both species. Furthermore, peak calling activities of both species matched the optimal hydroperiod in rice Paddies. In addition, D. japonicus breeding behaviour was influenced by environmental variables such as temperature, whereas D. suweonensis seemed to require the planting of rice seedlings to initiate breeding. Therefore, as both Dryophytes species’ breeding activities are influenced by agro-environmental variables, this study highlights the importance of also preserving anthropogenically modified landscapes for the conservation of species.
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impact of water quality on the occurrence of two endangered korean anurans dryophytes suweonensis and pelophylax chosenicus
Herpetologica, 2018Co-Authors: Amael Borzee, Choi Nak Kyong, Yikweon JangAbstract:Abstract Water contaminants play an important role in threatening amphibian species already in the midst of the sixth extinction. Species relying exclusively on agricultural habitats for breeding are under multiple, and sometimes synergistic, threats because of the high levels of contamination from chemicals used as plant fertilizers and pest control. In the Republic of Korea, two anuran species listed as endangered occur primarily in rice Paddies: Suweon Treefrogs (Dryophytes suweonensis) and Gold-spotted Pond Frogs (Pelophylax chosenicus). The purpose of this study was to describe the relationship between the occurrence of these two species and water contaminants in rice Paddies. Water quality and contaminants were assessed through multisite triplicate sampling. The rice Paddies where the two anuran species occurred were characterized by higher concentrations of iron and lower concentrations of phosphate than rice Paddies without the two species. Furthermore, low conductivity in the water was correlated...
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Asymmetric competition over calling sites in two closely related treefrog species.
Scientific Reports, 2016Co-Authors: Amael Borzee, Jun Young Kim, Yikweon JangAbstract:Interspecific competition occurs when one species using a resource limits the use of that resource by another species. A dominance relationship between the species competing over a resource may result in asymmetric competition. Here, we tested the hypothesis that two sympatric treefrog species, the endangered Hyla suweonensis and the abundant H. japonica, compete with each other over calling sites. We observed the locations of calling individuals of the two treefrog species in rice Paddies and tested whether removing one species affected the calling locations of the other species. Individuals of the two species were spatially isolated within rice Paddies, with H. japonica at the edges and H. suweonensis in the interior. Male H. suweonensis moved towards the edges of rice Paddies when male H. japonica were removed from the area, whereas male H. japonica hardly moved when male H. suweonensis were removed. The results of both studies are consistent with asymmetric interspecific competition, in which the calling locations of H. suweonensis are affected by the calling activity of H. japonica. In addition, H. japonica were found “sitting” on the substrate during call production, whereas H. suweonensis were “holding” onto vegetation. The difference in calling posture may represent an adaptive response to asymmetric interspecific competition.
Yikweon Jang - One of the best experts on this subject based on the ideXlab platform.
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Interspecific Variation in Seasonal Migration and Brumation Behavior in Two Closely Related Species of Treefrogs
Frontiers Media S.A., 2019Co-Authors: Amael Borzee, Yoojin Choi, Ye Eun Kim, Piotr G. Jablonski, Yikweon JangAbstract:Most amphibians migrate between flooded habitats for breeding and dry habitats for non-breeding activities, however, differences in closely related species may highlight divergent evolutionary histories. Through field surveys, Harmonic Direction Finder tracking and laboratory behavioral experiments during the wintering season, we demonstrated differences in seasonal migration and hibernation habitats between Dryophytes suweonensis and D. japonicus. We found that D. japonicus migrated toward forests for overwintering and then back to rice Paddies for breeding in spring. By contrast, D. suweonensis was found to hibernate buried in the vicinity of rice Paddies, its breeding habitat. We also found that the difference in migrating behavior matched with variation in microhabitat use during brumation and hibernation between the two species. Our findings highlight different ecological requirements between the two species, which may result from their segregated evolutionary histories, with speciation potentially linked to species use of a new breeding habitat. Additionally, the use of rice Paddies for both breeding and hibernation may contribute to the endangered status of D. suweonensis because of the degradation of hibernation sites in winter
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Policy Recommendation for the Conservation of the Suweon Treefrog (Dryophytes suweonensis) in the Republic of Korea
Frontiers Media S.A., 2019Co-Authors: Amael Borzee, Yikweon JangAbstract:The Suweon treefrog (Dryophytes suweonensis) is an endangered species with an important evolutionary significance. However, the current rate of decline projects the extinction of the species within a few decades in the Republic of Korea. The species is presently exclusively inhabiting rice Paddies and is not present in any protected area, although it would be relatively easy to designate protected area under the RAMSAR convention and correct the current negative population dynamics. Through three policy recommendations, we present the points of importance for the conservation of the Suweon Treefrog, list the site of importance for its conservation, and introduce an agricultural model allowing for the conservation of the species as well as continued rice production and economic income.Actionable recommendations: - Establishment of protected areas within the range of D. suweonensis- Pesticide and herbicide ban in rice-paddy complexes where D. suweonensis occurs- Vegetation mowing limit for surroundings of rice Paddies where D. suweonensis occurs
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relationship between agro environmental variables and breeding hylids in rice Paddies
Scientific Reports, 2018Co-Authors: Amael Borzee, Kyongman Heo, Yikweon JangAbstract:When natural wetlands are destroyed, many anuran species are forced to breed in alternative habitats such as rice Paddies. We conducted field surveys for the endangered Dryophytes suweonensis and the numerous D. japonicus, from the beginning of the breeding season until two weeks after its peak. We recorded the presence, number of individuals and calling indices for each species. We hypothesized that D. japonicus would start breeding earlier than D. suweonensis, which would have originally been breeding solely in floodplains. The results of our analyses demonstrate that the rice cultivation phase was the most important factor in predicting the calling activities of both species. Furthermore, peak calling activities of both species matched the optimal hydroperiod in rice Paddies. In addition, D. japonicus breeding behaviour was influenced by environmental variables such as temperature, whereas D. suweonensis seemed to require the planting of rice seedlings to initiate breeding. Therefore, as both Dryophytes species’ breeding activities are influenced by agro-environmental variables, this study highlights the importance of also preserving anthropogenically modified landscapes for the conservation of species.
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impact of water quality on the occurrence of two endangered korean anurans dryophytes suweonensis and pelophylax chosenicus
Herpetologica, 2018Co-Authors: Amael Borzee, Choi Nak Kyong, Yikweon JangAbstract:Abstract Water contaminants play an important role in threatening amphibian species already in the midst of the sixth extinction. Species relying exclusively on agricultural habitats for breeding are under multiple, and sometimes synergistic, threats because of the high levels of contamination from chemicals used as plant fertilizers and pest control. In the Republic of Korea, two anuran species listed as endangered occur primarily in rice Paddies: Suweon Treefrogs (Dryophytes suweonensis) and Gold-spotted Pond Frogs (Pelophylax chosenicus). The purpose of this study was to describe the relationship between the occurrence of these two species and water contaminants in rice Paddies. Water quality and contaminants were assessed through multisite triplicate sampling. The rice Paddies where the two anuran species occurred were characterized by higher concentrations of iron and lower concentrations of phosphate than rice Paddies without the two species. Furthermore, low conductivity in the water was correlated...
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Asymmetric competition over calling sites in two closely related treefrog species.
Scientific Reports, 2016Co-Authors: Amael Borzee, Jun Young Kim, Yikweon JangAbstract:Interspecific competition occurs when one species using a resource limits the use of that resource by another species. A dominance relationship between the species competing over a resource may result in asymmetric competition. Here, we tested the hypothesis that two sympatric treefrog species, the endangered Hyla suweonensis and the abundant H. japonica, compete with each other over calling sites. We observed the locations of calling individuals of the two treefrog species in rice Paddies and tested whether removing one species affected the calling locations of the other species. Individuals of the two species were spatially isolated within rice Paddies, with H. japonica at the edges and H. suweonensis in the interior. Male H. suweonensis moved towards the edges of rice Paddies when male H. japonica were removed from the area, whereas male H. japonica hardly moved when male H. suweonensis were removed. The results of both studies are consistent with asymmetric interspecific competition, in which the calling locations of H. suweonensis are affected by the calling activity of H. japonica. In addition, H. japonica were found “sitting” on the substrate during call production, whereas H. suweonensis were “holding” onto vegetation. The difference in calling posture may represent an adaptive response to asymmetric interspecific competition.
Weiqi Wang - One of the best experts on this subject based on the ideXlab platform.
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coupled steel slag and biochar amendment correlated with higher methanotrophic abundance and lower ch 4 emission in subtropical Paddies
Environmental Geochemistry and Health, 2020Co-Authors: Miaoying Wang, Xingfu Lan, Abbas Ali Abid, Ankit Singla, Chun Wang, Jordi Sardans, Joan Llusià, Josep Peñuelas, Weiqi WangAbstract:Aerobic methanotrophs in Paddies serve as methane (CH4) filters and thereby reduce CH4 emissions. Amending soil with waste products can mitigate CH4 emissions in crops, but little is known about the impacts of amendments with steel slag and biochar on the populations and activities of aerobic methanotrophs in rice cropland. We used real-time quantitative PCR detecting system and high-throughput sequencing to determine the effects of slag and biochar amendments on CH4 emission, abundance, and community structure of methanotrophs, and the relationships between soil properties and the abundance and community composition of methanotrophs during the rice growing season in both early and late Paddies. Soil salinity and pH were significantly higher for an amendment with both slag and biochar than the control in both the early and late Paddies, and pH was significantly higher for a slag amendment in the late paddy. Cumulative CH4 emission was lower for the slag and slag + biochar amendments than the control in early paddy by—34.1%. Methanotrophic abundance was three- and sixfold higher for the slag + biochar amendment than the control in the early and late Paddies (p < 0.05), respectively. The abundance of different groups of methanotrophs varied among the treatments. The relative abundance of Methylosarcina was higher for the slag amendment than the control, and the relative abundance of Methylomonas was lower for biochar, and slag + biochar amendments than the control. The relative abundance of Methylocystis was higher for the slag and slag + biochar amendments than the control in the early paddy, and the relative abundance of Methylocystis was higher for the slag, biochar, and slag + biochar amendments in the late paddy. Univariate and multivariate analyses indicated that the higher abundance of methanotrophic bacteria for the slag and slag + biochar amendments was correlated with soil pH, salinity, soil organic carbon, and C/N ratio, and the relative abundances of Methylocystis, Methylomonas, and Methylosarcina were associated with the effective mitigation of CH4 emission in the Paddies. A discriminant general analysis indicated that the total population of methanotrophs was larger for the slag + biochar amendment than the control, and that this effect was only weakly correlated with changes in the soil properties, demonstrating that this effect on the size and species composition of methanotrophic soil populations was mostly associated with a direct effect of the slag + biochar amendment.
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Coupled steel slag and biochar amendment correlated with higher methanotrophic abundance and lower CH_4 emission in subtropical Paddies
Environmental Geochemistry and Health, 2019Co-Authors: Miaoying Wang, Xingfu Lan, Abbas Ali Abid, Xuping Xu, Ankit Singla, Chun Wang, Jordi Sardans, Joan Llusià, Josep Peñuelas, Weiqi WangAbstract:Aerobic methanotrophs in Paddies serve as methane (CH_4) filters and thereby reduce CH_4 emissions. Amending soil with waste products can mitigate CH_4 emissions in crops, but little is known about the impacts of amendments with steel slag and biochar on the populations and activities of aerobic methanotrophs in rice cropland. We used real-time quantitative PCR detecting system and high-throughput sequencing to determine the effects of slag and biochar amendments on CH_4 emission, abundance, and community structure of methanotrophs, and the relationships between soil properties and the abundance and community composition of methanotrophs during the rice growing season in both early and late Paddies. Soil salinity and pH were significantly higher for an amendment with both slag and biochar than the control in both the early and late Paddies, and pH was significantly higher for a slag amendment in the late paddy. Cumulative CH_4 emission was lower for the slag and slag + biochar amendments than the control in early paddy by—34.1%. Methanotrophic abundance was three- and sixfold higher for the slag + biochar amendment than the control in the early and late Paddies ( p
