The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Zheng Tiegang - One of the best experts on this subject based on the ideXlab platform.
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Schizothorax prenanti Swimming Behavior in response to different flow patterns in vertical slot fishways with different slot positions.
The Science of the total environment, 2020Co-Authors: Li Guangning, Shuangke Sun, Haitao Liu, Zheng TiegangAbstract:Abstract Fish Swimming Behavior is a critical parameter for the design of vertical slot fishways. Although Schizothorax prenanti is a significant reproductive potamodromous migratory fish species in the upper reaches of the rivers in Southwest China, its Swimming Behavior has not been extensively researched. Therefore, in this study, a comparative experiment was conducted in vertical slot fishways to analyze the Behavior of Schizothorax prenanti in response to different flow patterns, with respect to different slot positions. The experimental model was designed with a length scale of 1:4, and a method for selecting the appropriate fish size in the scaled physical model was proposed. Based on these experiments, it was found that the typical upstream trajectories of Schizothorax prenanti are traceable to the sidewall of the pool, which are characterized by low velocity and turbulent kinetic energy (TKE). The hydraulic variables exhibited an asymmetric distribution within the vertical slot, and the fish were found to pass through the area with the lowest velocity and TKE. A flow pattern with a guide wall length-to-pool width ratio of P/B = 0.25, in which Schizothorax prenanti can immediately find the sidewall, is suitable for fish migration. Therefore, this is the recommended value for the construction of effective vertical-slot fishway structures.
Li Guangning - One of the best experts on this subject based on the ideXlab platform.
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Schizothorax prenanti Swimming Behavior in response to different flow patterns in vertical slot fishways with different slot positions.
The Science of the total environment, 2020Co-Authors: Li Guangning, Shuangke Sun, Haitao Liu, Zheng TiegangAbstract:Abstract Fish Swimming Behavior is a critical parameter for the design of vertical slot fishways. Although Schizothorax prenanti is a significant reproductive potamodromous migratory fish species in the upper reaches of the rivers in Southwest China, its Swimming Behavior has not been extensively researched. Therefore, in this study, a comparative experiment was conducted in vertical slot fishways to analyze the Behavior of Schizothorax prenanti in response to different flow patterns, with respect to different slot positions. The experimental model was designed with a length scale of 1:4, and a method for selecting the appropriate fish size in the scaled physical model was proposed. Based on these experiments, it was found that the typical upstream trajectories of Schizothorax prenanti are traceable to the sidewall of the pool, which are characterized by low velocity and turbulent kinetic energy (TKE). The hydraulic variables exhibited an asymmetric distribution within the vertical slot, and the fish were found to pass through the area with the lowest velocity and TKE. A flow pattern with a guide wall length-to-pool width ratio of P/B = 0.25, in which Schizothorax prenanti can immediately find the sidewall, is suitable for fish migration. Therefore, this is the recommended value for the construction of effective vertical-slot fishway structures.
Shuangke Sun - One of the best experts on this subject based on the ideXlab platform.
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Schizothorax prenanti Swimming Behavior in response to different flow patterns in vertical slot fishways with different slot positions.
The Science of the total environment, 2020Co-Authors: Li Guangning, Shuangke Sun, Haitao Liu, Zheng TiegangAbstract:Abstract Fish Swimming Behavior is a critical parameter for the design of vertical slot fishways. Although Schizothorax prenanti is a significant reproductive potamodromous migratory fish species in the upper reaches of the rivers in Southwest China, its Swimming Behavior has not been extensively researched. Therefore, in this study, a comparative experiment was conducted in vertical slot fishways to analyze the Behavior of Schizothorax prenanti in response to different flow patterns, with respect to different slot positions. The experimental model was designed with a length scale of 1:4, and a method for selecting the appropriate fish size in the scaled physical model was proposed. Based on these experiments, it was found that the typical upstream trajectories of Schizothorax prenanti are traceable to the sidewall of the pool, which are characterized by low velocity and turbulent kinetic energy (TKE). The hydraulic variables exhibited an asymmetric distribution within the vertical slot, and the fish were found to pass through the area with the lowest velocity and TKE. A flow pattern with a guide wall length-to-pool width ratio of P/B = 0.25, in which Schizothorax prenanti can immediately find the sidewall, is suitable for fish migration. Therefore, this is the recommended value for the construction of effective vertical-slot fishway structures.
Haitao Liu - One of the best experts on this subject based on the ideXlab platform.
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Schizothorax prenanti Swimming Behavior in response to different flow patterns in vertical slot fishways with different slot positions.
The Science of the total environment, 2020Co-Authors: Li Guangning, Shuangke Sun, Haitao Liu, Zheng TiegangAbstract:Abstract Fish Swimming Behavior is a critical parameter for the design of vertical slot fishways. Although Schizothorax prenanti is a significant reproductive potamodromous migratory fish species in the upper reaches of the rivers in Southwest China, its Swimming Behavior has not been extensively researched. Therefore, in this study, a comparative experiment was conducted in vertical slot fishways to analyze the Behavior of Schizothorax prenanti in response to different flow patterns, with respect to different slot positions. The experimental model was designed with a length scale of 1:4, and a method for selecting the appropriate fish size in the scaled physical model was proposed. Based on these experiments, it was found that the typical upstream trajectories of Schizothorax prenanti are traceable to the sidewall of the pool, which are characterized by low velocity and turbulent kinetic energy (TKE). The hydraulic variables exhibited an asymmetric distribution within the vertical slot, and the fish were found to pass through the area with the lowest velocity and TKE. A flow pattern with a guide wall length-to-pool width ratio of P/B = 0.25, in which Schizothorax prenanti can immediately find the sidewall, is suitable for fish migration. Therefore, this is the recommended value for the construction of effective vertical-slot fishway structures.
Stanley I. Dodson - One of the best experts on this subject based on the ideXlab platform.
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Swimming Behavior of Daphnia: its role in determining predation risk
Journal of Plankton Research, 1998Co-Authors: Thomas C. O'keefe, Matthew C. Brewer, Stanley I. DodsonAbstract:Individual Swimming Behavior of zooplankton can play an important role in determining how planktivorous fish select their prey. Although several studies have documented the effect of prey size, contrast or degree of pigmentation, escape ability, encounter rate and abundance in determin- ing predation risk, the importance of individual Behavior has received relatively little attention by aquatic ecologists. Recent advances in the technology of video recording and computer analysis of motion have allowed us to collect digitized three-dimensional video records of free-Swimming zooplankton such as Daphnia. We found that Daphnia clones, including those within a single species, exhibit a wide range of Swimming Behaviors as measured by Swimming speed. The individual Behavior of a species cannot be adequately described by looking at one clone. We also show that different Behavior observed in live Daphnia can play an important role in determining attractiveness to visual predators. Given a choice between two clones of equal size and visibility contrast, fish selected indi- viduals from the faster Swimming clone. Our results suggest that current models of prey selection would be improved by the incorporation of individual Swimming Behavior because it is an important factor determining overall prey visibility.
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Individual Swimming Behavior of Daphnia: effects of food, light and container size in four clones
Journal of Plankton Research, 1997Co-Authors: Stanley I. Dodson, Shanna M. Ryan, Ralph Tollrian, Winfried LampertAbstract:Different species of Daphnia show differences in their Swimming Behavior under different environmental conditions. We measured the three-dimensional Swimming Behavior of individual adult female Daphnia in the mesocosm-scale Plon plankton towers (6400 1) and in small (183 ml) observation chambers. Speed, sinking rate and turning angle were chosen as optimal variables for describing the free-Swimming animals of four species. Speed, sinking rate and turning angle show uni- formity of variance among treatments, and they are relatively independent. Light level and food level strongly affected Swimming Behavior. Light and food effects tended to be independent, although there were two instances of synergism (out of 12 possible interactions). Each of the four species (one clone per species) showed a unique response to food and light, which may reflect the diverse environmental origin of each clone. Swimming Behavior was consistently different between the small-scale (183 ml) observation chamber and the mesocosm-scale (6400 1) plankton tower, suggesting that container size affects Swimming Behavior: in the smaller chamber, Daphnia, regardless of species, swam slower, sank slower and tended to move in straighter paths.
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Size-specific Swimming Behavior of Daphnia pulex
Journal of Plankton Research, 1991Co-Authors: Stanley I. Dodson, Charles W. RamcharanAbstract:Body length affects several aspects of the Behavior of quietly Swimming Daphnia pulex Swimming and sinking rates were measured at 0.033 s intervals during the 'hops' characteristic of Daphnia Swimming Behavior Larger animals swim faster, cover more distance, and produce more powerful Swimming strokes. Larger Daphnia also sink faster, but the sinking rate scales as length to the 0 58 power, far lower than the power of 2 00 predicted by Stokes Law considerations. The number of hops s"1 was independent of body size, although a theoretical analysis predicts hopping rate (antennal beat frequency) should increase as body length squared. Turning Behavior, measured as the ratio of displacement to total distance, during 5 s, is also independent of body size Independence of several parameters of body motion and body size implies that factors other than simple mechanics affect Daphnia Swimming Behavior
