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43 results for “flood pulse”
Fig. 3 in Population dynamics of the migratory fish Prochilodus lineatus in a neotropical river: the relationships with river discharge, flood pulse, El Niño and fluvial megafan behaviour
Fig. 3. Total dissolved solids concentration (TDS) in Pilcomayo River water (a) or water temperature (b) and gonadal maturation indices of Sábalo (Prochilodus lineatus) fish versus time (May 1998 until February 1999). The gonadal maturation indices are scaled from 1 to 6 in which 6 represents spawning.
Fig. 1 in Influence of environmental parameters on fish assemblage of a Neotropical river with a flood pulse regime, Central Brazil
Fig. 1. Study area located in the lower section of the Mortes River, Bananal floodplain, Central Brazil. The boldface numbers correspond to the stretches sampled.
Timing of hydrologic anomalies direct impacts on migration traits in a flood pulse fishery system
<p>1. Understanding adaptive reservoir management strategies that balance ecological outcomes with other objectives necessitates properly articulated environmental objectives. Aside from flood pulse extent-related metrics, residual-based descriptors provide robust descriptions of fish assemblage structure and harvest.</p> <p>2. We proposed a model framework based on spectral analysis of hydrologic variation and the Multivariate AutoRegressive State Space (MARSS) model to statistically quantify the effect sizes of hydrologic variation impacts on total fish catch and functional group (migration types) fish harvest and applied it to 17 years of fish harvest data from the Lower Mekong River Basin (LMB).</p> <p>3. Our findings suggest that duration and timing of hydrologic anomalies matter as much as their magnitude. Anomaly droughts coupled with strong pulse can benefit species if timed correctly. Longitudinal migrators were more sensitive to anomalous floods and droughts than other migratory species. Fish catch projections using effect sizes derived from historical data revealed that a well-timed and protracted flood followed by a powerful flood pulse would be advantageous to the fishery, but a flood delay could negate such benefits.</p> <p>4. Our results add to a growing body of research that suggests ecological flows can be engineered. For most dams, the rule curve describing reservoir releases and resulting downstream hydrograph is designed in an ecological vacuum in which the objectives are to maximize human services—power production, flood control or navigation. Our work demonstrates that hydrograph can be designed to manage aspects of functional biodiversity directly. Though the exact shape of our hydrograph may not apply to other engineered river systems, we suggest that the approach can be applied generally, and globally both to developed and developing river basins. Specifically, a functional biodiversity rule curve could be optimized as an additional objective function in a multi-objective optimization framework. Our methodology provides a quantitative method for deriving an ecological flow for this larger tradeoff analysis.</p>
Timing of hydrologic anomalies direct impacts on migration traits in a flood pulse fishery system
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Data from: Response of Prochilodus nigricans to flood pulse variation in the central Amazon
The influence of the flood pulse on fish populations has been posited, but infrequently tested or quantified. Here, we tested the effect of habitat on population size, using Prochilodus nigricans as a case study species. Floodplain habitat was based on the littoral zone area occupied by P. nigricans to feed. The magnitude of this habitat in each hydrological year, the moving littoral (ML), was expressed as the sum of daily littoral areas during the advancing flood pulse, using satellite-based passive microwave data. Annual population size was estimated by age-class, using a dynamic age-structured model (MULTIFAN-CL) based on catches, effort, and fish length frequencies from the Manaus-based fishery over 12.75 years. The principal null hypothesis was that ML, using three lag times, had no effect on population size of a single age class of P. nigricans. The population size at 29 months of age was positively related (P=0.00030) to floodplain habitat (ML) earlier in the same year, when the fish were 21-27 months old. The result implies a density-dependent relationship for the population with respect to its feeding habitat. Potential mechanisms governed by flood pulse variation and habitat quality for this and other species utilizing floodplain habitats are discussed.
Figure 8 in The influence of flood pulses on the reproductive strategy of two species of passalid beetle in the fluvial archipelago of Anavilhanas, Amazon, Brazil
Figure 8. Monthly abundance of larvae of Passalus punctiger in the different developmental stages for the period between April 1996 and March 1997 at the ecological station of Anavilhanas, Novo Airão, Amazonas State. Notes: Spotted line, first instar; black line, second instar; white line, third instar.
Figure 7 in The influence of flood pulses on the reproductive strategy of two species of passalid beetle in the fluvial archipelago of Anavilhanas, Amazon, Brazil
Figure 7. Analysis using Pearson's correlation coefficient to test for a relationship between the pluviometric index and the number of larvae of Passalus punctiger between April 1996 and March 1997 at the ecological station of Anavilhanas, Novo Airão, Amazonas State.
Figure 6 in The influence of flood pulses on the reproductive strategy of two species of passalid beetle in the fluvial archipelago of Anavilhanas, Amazon, Brazil
Figure 6. Analysis using Pearson's correlation coefficient to test for a relationship between the water level of the Negro River and the number of larvae of Passalus punctiger between April 1996 and March 1997 at the ecological station of Anavilhanas, Novo Airão, Amazonas State.
Figure 5 in The influence of flood pulses on the reproductive strategy of two species of passalid beetle in the fluvial archipelago of Anavilhanas, Amazon, Brazil
Figure 5. Variation in the water level of the Negro River plotted against the monthly abundance of larvae of Passalus punctiger at the ecological station of Anavilhanas, Novo Airão, Amazonas State, between April 1996 and March 1997. Notes: Line, abundance of larvae; columns, average level (m).
Figure 4 in The influence of flood pulses on the reproductive strategy of two species of passalid beetle in the fluvial archipelago of Anavilhanas, Amazon, Brazil
Figure 4. Monthly abundance of larvae of Passalus abortivus in the different developmental stages collected between April 1996 and March 1997 at the ecological station of Anavilhanas, Novo Airão, Amazonas State. Notes: Spotted line, first instar; black line, second instar; white line, third instar.
Figure 1 in The influence of flood pulses on the reproductive strategy of two species of passalid beetle in the fluvial archipelago of Anavilhanas, Amazon, Brazil
Figure 1. Variation in the water level of the Negro River plotted against the monthly abundance of larvae of Passalus abortivus collected between April 1996 and March 1997 from 10 islands on the alluvial plain, which is periodically inundated, at the ecological station of Anavilhanas, Novo Airão, Amazonas State, Brazil. Notes: Line, abundance of larvae; columns, average level (m).
Figure 3 in The influence of flood pulses on the reproductive strategy of two species of passalid beetle in the fluvial archipelago of Anavilhanas, Amazon, Brazil
Figure 3. Analysis using Pearson's correlation coefficient to test for a relationship between the pluviometric index and the number of larvae of Passalus abortivus between April 1996 and March 1997 at the ecological station of Anavilhanas, Novo Airão, Amazonas State.
Figure 2 in The influence of flood pulses on the reproductive strategy of two species of passalid beetle in the fluvial archipelago of Anavilhanas, Amazon, Brazil
Figure 2. Analysis using Pearson's correlation coefficient to test for a relationship between the water level of the Negro River and the number of larvae of Passalus abortivus between April 1996 and March 1997 at the ecological station of Anavilhanas, Novo Airão, Amazonas State.
Data from: Do flood pulses structure amphibian communities in floodplain environments?
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Data from: Cape buffalo (Syncerus caffer caffer) social dynamics in a flood-pulsed environment
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Data from: Response of Prochilodus nigricans to flood pulse variation in the central Amazon
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Data from: Congregations of rodent-eating birds during flood irrigation of crops exploit novel prey pulses and potentially provide pest control services
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Fig. 1 in Fish beta diversity responses to environmental heterogeneity and flood pulses are different according to reproductive guild
Fig. 1. Map of the Upper Paraná River floodplain. The triangles represent the sampling stations of the Paraná River sub-basin, the circles represent the sampling stations of the Baía River sub-basin, and the squares represent the sampling stations of the Ivinhema River sub-basin.
Fig. 3 in Fish beta diversity responses to environmental heterogeneity and flood pulses are different according to reproductive guild
Fig. 3. Data analysis procedure for environmental heterogeneity and beta diversity for the different matrices of the trophic and reproductive guilds.
Fig. 3 in Effects of the interannual variations in the flood pulse mediated by hypoxia tolerance: the case of the fish assemblages in the upper Paraná River floodplain
Fig. 3. Interannual variation of the absolute and mean ± s.e. values of dissolved oxygen (a, c) and water transparency (b, d) in lakes (circle) and river channels (square) of the upper Paraná River floodplain, in years of short (2000 and 2001) and moderate (2002 and 2003) floods. Numbers 1-6 are codes of the sampling stations (see Fig. 1).
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Allen Brain Atlas
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