2020
DOI: 10.1002/aqc.3465
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Dams in the Amazon: The importance of maintaining free‐flowing tributaries for fish reproduction

Abstract: Free‐flowing tributaries are important for the maintenance of fish diversity in dammed systems. In relation to the reproduction of fish species, the role of a free‐flowing tributary was evaluated and compared with that of a dammed tributary downstream of large dams in the Madeira River, one of the main tributaries of the Amazon River. Two hypotheses were tested: (i) the densities of the ichthyoplankton differ between the dammed and the free‐flowing tributaries; and (ii) the free‐flowing tributary contributes a… Show more

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Cited by 31 publications
(28 citation statements)
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“…The importance of free movement and migration is well understood for fishes (Vasconcelos et al, 2020), particularly for diadromous species that depend on migrations between oceans and fresh water to complete their life cycles (Smialek et al, 2019). The provision of fish passage for charismatic flagship species is often proposed as a solution (Silva et al, 2018a).…”
Section: Effects On Connectivitymentioning
confidence: 99%
See 1 more Smart Citation
“…The importance of free movement and migration is well understood for fishes (Vasconcelos et al, 2020), particularly for diadromous species that depend on migrations between oceans and fresh water to complete their life cycles (Smialek et al, 2019). The provision of fish passage for charismatic flagship species is often proposed as a solution (Silva et al, 2018a).…”
Section: Effects On Connectivitymentioning
confidence: 99%
“…Thus, in addition to their role as migration corridors, the substitute habitat function of bypass channels must be considered equally, even though their limited space cannot fully compensate for deficits in the main stem (Pander & Geist, 2013). Especially in large, dammed rivers, free‐flowing tributaries are important for the recruitment of rheophilic fishes (Silva et al, 2018b; Vasconcelos et al, 2020). There is also increasing focus on restoring environmental flow (e‐flow) regimes in regulated rivers: i.e.…”
Section: Challenges and Possible Solutions In Hydropower‐related Conservation Managementmentioning
confidence: 99%
“…In the social sector, indigenous and traditional riverside communities can lose resources essential for their subsistence, triggering changes to their cultures and ways of life and forcing evictions (Berkun, 2010; Fearnside, 2019; Santos et al, 2020). In the environmental sector, hydropower dams are considered primary threats to freshwater species, as well as the surrounding ecosystems including floodplains and wetlands (Berkun, 2010; Dudgeon, 2000; Vasconcelos et al, 2020).…”
Section: Introductionmentioning
confidence: 99%
“…Mitigating dam impacts is a priority for the protection and restoration of freshwater biodiversity (Harper et al, 2021;Moran et al, 2018;Tickner et al, 2020). Hydropower developments are among the most significant threats to Amazonian freshwater ecosystems (Castello & Macedo, 2016;Latrubesse et al, 2017) and biodiversity (Dudgeon, 2019;Latrubesse et al, 2020;Vasconcelos et al, 2020). Although hydropower supplies the demand of basic human necessities, hydropower dams result in impacts that produce negative effects and feedbacks that modify freshwater ecosystem processes, functions and services (Dudgeon, 2019;Valiente-Banuet et al, 2015).…”
mentioning
confidence: 99%
“…The structure, composition, functions and services of globally important Amazonian ecosystems are threatened due to expansion of hydropower developments. To date a total of 29 dams (operational capacity > 30 MW) have been installed across Brazilian Amazonia (SIGEL, 2021) and another 750 are planned or under construction (Vasconcelos et al, 2020). This increase is incentivized by increasing energy demand, national and regional politics and international investment (Castello, 2021;Fearnside, 2018;Gerlak et al, 2020).…”
mentioning
confidence: 99%