Identifying the current and future status of freshwater connectivity corridors in the Amazon Basin

Caldas, Bernardo; Thieme, Michele; Shahbol, Natalie; Coelho, Maria E.; Grill, Guenther; Damme, Paul A. Van; Aranha, Ricardo; Cañas, Carlos; Fagundes, Camila Kurzmann; Franco‐León, Nicole; Herrera‐Collazos, Edgar E.; Jézéquel, Céline; Montoya, Mariana; Mosquera‐Guerra, Frederico; Oliveira‐da‐Costa, Marcelo; Paschoalini, Mariana; Petry, Paulo; Oberdorff, Thierry; Trujillo, Fernando; Tedesco, Pablo A.; Ribeiro, Mauro César Lambert de Brito

doi:10.1111/csp2.12853

Cited by 10 publications

(8 citation statements)

References 82 publications

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“…The possible seasonal mischaracterisation in Lake Cujubim can be attributed to a series of intervening anthropogenic factors, especially the construction of dams along the Madeira River. The Madeira is no longer considered a free‐flowing river and is among the most vulnerable in the Amazon basin, this change has caused substantial reductions in connectivity and has affected fish species (Caldas et al., 2023). Less than half of the world's major river systems remain free‐flowing, with the development of water infrastructure, especially those that block rivers, which becomes a global threat to river connectivity (Grill et al., 2019) and results in a decrease in biodiversity and access to habitats used for spawning, foraging and as a refuge for fish (Liermann et al., 2012).…”

Section: Discussionmentioning

confidence: 99%

Effects of hydrological and spatial seasonality on taxonomic and functional diversity of fish assemblages in an Amazonian floodplain lake

de Oliveira Lima,

Andrade,

Sousa

2024

Ecology of Freshwater Fish

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The floodplain lakes of the Amazon constitute one of the most important aquatic systems in terms of fish biodiversity. These ecosystems are influenced by the flood pulse, which in turn, affects the behaviour of fish communities within this lake ecosystem. In this study, we tested the hypothesis that the facets of taxonomic and functional diversity may be influenced by the conditions of ‘patches’ of internal habitats, considering the margins and central environments of a floodplain lake in the Amazon. Lake Cujubim, located on the right bank of the Madeira River, was evaluated via fisheries carried out in the high‐water and low‐water phases, during the day and night, and considering two location strata. The results suggest that the absence of significant differences in alpha taxonomic diversity between the two phases may be a possible seasonal mischaracterisation in Lake Cujubim attributed mainly to dam constructions along the Madeira River. Apparently, no major differences occur in the assembly of fish in terms of their taxonomic and functional characteristics, regardless of luminosity. In the strata of the locations, demonstrates noticeable habitat patches, with the margins being bioregions with high incidences of individuals of the Engraulidae family, confirmed by both taxonomic and functional diversity (alpha and beta). It can be seen that, even in connected lakes, there are differentiated metacommunities between the bioregions, thus forming patches of habitat, and that the shores of the lake, especially those located in proximity or distant from the river, are more suitable areas for food and refuge.

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Section: Discussionmentioning

confidence: 99%

Effects of hydrological and spatial seasonality on taxonomic and functional diversity of fish assemblages in an Amazonian floodplain lake

de Oliveira Lima,

Andrade,

Sousa

2024

Ecology of Freshwater Fish

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“…Thus, the Amazonian population, which heavily depends on fishery resources for its food security, is negatively impacted by the effect of dams on fisheries. As migratory fish account for about 93% (range 77% to 99%) of what is caught in the basin, they contribute a total of US$ 436 million annually to the region (Caldas et al, 2023). The reduction in fishing therefore, in addition to affecting food security, also has a significant economic impact for this population (Lima et al, 2020).…”

Section: Hydroelectric Plants In the Amazon: Socio-environmental Impactsmentioning

confidence: 99%

“…Recent studies have emphasized the potential loss of biodiversity, fisheries, water flows and sediments, and the fragmentation of river connectivity due to dam development (Anderson et al, 2018;Flecker et al, 2022). These assessments show that existing dams are concentrated in tributary networks and headwater systems, leaving many major rivers particularly vulnerable to fragmentation by future large dam development (Caldas et al, 2023).…”

Section: Hydroelectric Plants In the Amazon: Socio-environmental Impactsmentioning

confidence: 99%

Just energy transition in Amazonia and the hydropower plants

Sant’Anna,

Bortoletto,

Donda

2024

RTM n. 32

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The effects of climate change have been studied and publicized by experts, civil society movements and organizations, international organizations, and felt in different ways around the world. To combat climate change, an energy transition to renewable sources is necessary, in addition to other policies and measures, including combating deforestation and forest degradation. In the Amazon, the energy transition has driven the expansion of hydroelectricity, in some cases, such as in Brazil, the region being considered the new energy frontier. However, the energy transition cannot ignore social inequalities and environmental impacts, it needs to be just, leaving no one behind. And this challenge of a just transition that faces the Amazon region, a provider of hydroelectric energy, but with a large part of its population without access to energy, or with access to energy from thermoelectric plants. This article seeks to discuss the challenges of a just energy transition in the Amazon, taking into account the difficulty of accessing energy in the region and the expansion of hydroelectricity, with its socio-environmental impacts.

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“…e-mail: paulo.setti@uni.lu. are intrinsically tied to the utilization of existing and future hydropower reservoirs [5]. Hence, the accurate mapping and assessment of inundation extent and its fluctuations across different spatial and temporal scales are imperative for comprehending and effectively managing the basin's resources.…”

Section: Introductionmentioning

confidence: 99%

Spaceborne GNSS-Reflectometry for Surface Water Mapping in the Amazon Basin

Setti,

Tabibi

2024

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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The Amazon basin, one of the world's largest and most vital ecosystems, presents a formidable challenge for accurately mapping its extensive surface water extent and dynamic seasonal and long-term variations. This challenge arises from the region's dense vegetation and persistent cloud coverage, limiting the applicability of conventional remote sensing technologies. Spaceborne GNSS-R offers a promising avenue to complement existing techniques, due to its distinctive sensitivity to surface water, vegetation, and cloud penetration, coupled with its high spatio-temporal resolution. In this study, we developed a track-wise method for mapping surface water using data from CYGNSS. Over a period of more than 6 years, from Apr. 2017 to May 2023, we produced monthly 3-km binary water/land maps covering the entire basin. Using a comprehensive set of metrics commonly employed in remote sensing studies, we conducted comparative analyses with datasets derived from optical, passive microwave, and radar missions. Our findings revealed that these products tend to underestimate the full extent of inundation across the Amazon basin. In contrast, CYGNSS, while exhibiting a slight tendency to overestimate surface water due to its heightened sensitivity to water and wet soils, provides valuable insights into inundation dynamics in the region. Furthermore, we compared our monthly inundated area estimates with water levels measured by four gauging stations across the basin. The results demonstrated a strong agreement between them and a maximum correlation coefficient of 0.74. Overall, the monthly water maps produced in this study hold significant promise for a wide range of hydrological investigations and practical applications.

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Identifying the current and future status of freshwater connectivity corridors in the Amazon Basin

Cited by 10 publications

References 82 publications

Effects of hydrological and spatial seasonality on taxonomic and functional diversity of fish assemblages in an Amazonian floodplain lake

Effects of hydrological and spatial seasonality on taxonomic and functional diversity of fish assemblages in an Amazonian floodplain lake

Just energy transition in Amazonia and the hydropower plants

Spaceborne GNSS-Reflectometry for Surface Water Mapping in the Amazon Basin

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