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517 results for “Floodplain”

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Fig. 1 in Effects of flood regime on the diet of Triportheus curtus (Garman, 1890) in an Amazonian floodplain lake

Fig. 1. Location of Lake Amapá and sampling points P1, P2, and P3.

opencc-by-4.0Sep 2011View details →

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Fig. 3 in Comparative feeding ecology and habitats use of Crenicichla species (Perciformes: Cichlidae) in a Venezuelan floodplain river

Fig. 3. Water level fluctuations of the Cinaruco River from December 13, 2005 to May 8, 2006.

opencc-by-4.0Jun 2009View details →

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Fig. 3 in Ecology and life history of an Amazon floodplain cichlid: the discus fish Symphysodon (Perciformes: Cichlidae)

Fig. 3. Sampling of a small submerged tree crown or 'galhada'

opencc-by-4.0Dec 2008View details →

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Fig. 1 in Effects of extended absence of flooding on the fish assemblages of three floodplain lagoons in the middle São Francisco River, Brazil

Fig. 1. Study area showing the location of the marginal lagoons.

opencc-by-4.0Dec 2006View details →

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Functional responses of fisheries to hydropower dams in the Amazonian Floodplain of the Madeira River

1. Tropical river fisheries support food security for millions of people but are increasingly threatened by hydropower development. How dams affect these fisheries remains poorly known in most regions. Here, we used a functional traits approach to evaluate the extent to which the composition of fishery yields in the Madeira River Basin the largest sub-basin in the Amazon, respond to dam construction. We also explored how dams affected the monetary value of yields and fishing-based income of the communities. 2. We collected fishing data in 17 locations distributed more than 300 km across upstream, reservoir, and downstream zones during pre-and post-dam construction periods. We interviewed 711 fishers from 13 communities to assess fishing income during pre- and post-dam periods. 3. Catch-per-unit effort (CPUE) declined significantly, i.e., by 37%, after dam construction. Multivariate analysis yielded six species clusters according to trait syndromes related to life history, migration, swimming-performance/microhabitat-use and economic value that were associated with the environmental data characteristic of pre- and post-dam periods. Comparison of CPUE of each cluster indicated that large species with periodic life-history strategy and regional or long-distance migratory behavior were most affected by dam construction, with CPUE declining by, on average, 31%. Declines in yields and shifts in functional composition of the fishery yields resulted in average decline of 21% in the monetary of functional clusters and 30% in fishing income. 4. Synthesis and applications. Our study indicates that the implementation of the dams and associated changes in environmental conditions affected the functional composition of yields and reduced catches, negatively affecting the fishing-based income of the studied communities in the Madeira River.Whereas catches of all functional clusters declined after the dams, species possessing large body sizes, traits related to a periodic life history strategy, either with long-distance or regional migratory behaviors, and the greatest economic importance appeared to be particularly vulnerable. These results imply that hydropower expansion will cause detrimental effects for fisheries and the livelihoods they sustain. Our results underscore the urgent need for considering alternative sources of renewable energy (e.g., solar power and in-stream turbines) to avoid irreversible socio-environmental damages of large dam projects. In river reaches where dams are already in operation or under construction, minimizing impacts will require improving operational protocols to reduce hydrological alterations and developing research and technology to improve the functionality of fish passages. In these locations, addressing losses in fishery value and fishing-based income will also require the implementation of fair compensation measures. Maintaining fish production requires conserving flow pulses and free-flowing rivers and tributaries critical for completing life cycles of fish species with vulnerable traits.

opencc-zeroDec 2022View details →

dryad36/100

Data and code for: Degradation of floodplain integrity within the contiguous United States

Despite the numerous hydrological, geological, and ecological benefits produced by floodplain landscapes, floodplains continue to be degraded by human activities at a much higher rate than other landscape types. This large-scale landscape modification has been widely recognized, yet a comprehensive, national dataset quantifying the degree to which human activities are responsible for this degradation has not previously been evaluated. In this research, we analyze floodplain integrity for the contiguous United States by spatially quantifying the impact of anthropogenic stressors on almost 80,000 floodplain units. This dataset demonstrates the prevalence of human modifications through widely available geospatial datasets, which we use to quantify indicators of floodplain integrity for five essential floodplain functions of flood attenuation, groundwater storage, habitat provision, sediment regulation, and organics and solute regulation. Our results show that floodplain degradation is spatially heterogeneous and that the integrity of nearly 70% of floodplains in the United States is poor. We highlight that quantifying the integrity of spatially explicit floodplain elements can allow for restoration efforts to be targeted to the areas in most desperate need of preservation.

opencc-zeroJul 2023View details →

dryad36/100

Data from: Beyond the case study: Characterizing natural floodplain heterogeneity in the United States

As river channels move across the valley floor, they create diverse topography including natural levees, cutoff meanders, secondary channels, and floodplain wetlands. These features increase the spatial heterogeneity of the floodplain. Many studies indicate that this heterogeneity strongly influences habitat abundance and diversity, storage of flood waters and excess nitrate or phosphate, and other floodplain functions. However, no one has systematically measured floodplain heterogeneity across multiple rivers and different geographic regions. We measured the heterogeneity of natural floodplains at 14 sites in the continental United States using metrics developed by landscape ecologists. We find that natural floodplains have distinctive heterogeneity signatures that relate to drainage area, the size of the floodplain, and other characteristics. The data included here are the original field data associated with 14 of the field sites, including GPS locations of floodplain transects, floodplain patches, sediment cores, and large wood; and delineated floodplain shapefiles.

opencc-zeroAug 2023View details →

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