Genetics and telemetry indicate unexpected movements among structured populations for <i>Brachyplatystoma platynemum</i> in the Amazon

Hahn, Lisiane; Silva, Priscilla Caroline; Malabarba, Maria Claudia; Malabarba, Luiz Roberto; Câmara, Luís Fernando da; Nunes, Leonardo D.; Machado, Sandro Lemos; Martins, Eduardo G.; Barthem, Ronaldo Borges

doi:10.1111/jfb.13978

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…The reasons for the lack of predam studies include the limited time between licensing and dam construction and operation, the technical complexity of studies, and difficulties experienced in regions with poor infrastructure such as the Amazon basin (Hahn, 2012;Hahn et al, 2015). At best, studies assessing the migration patterns of fish affected by hydropower projects are initiated during dam construction (Hahn et al, 2019a;Hahn et al, 2019b), at a stage when the hydrological dynamics have already been significantly altered, affecting the migratory behaviour of the species.…”

Section: Introductionmentioning

confidence: 99%

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Dazed and confused: Behavioural constraints impose major challenges to fish passage in the neotropics

Lopes

Alves²,

Peressin

2021

Aquatic Conservation

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1. The role of fish translocation upstream of dams, for the conservation of migratory species, is controversial. An important but still unaddressed question is whether migratory patterns are affected, after the translocation events, by a hydropower dam. In existing dams, a useful means to test this might be to compare the behaviour of translocated fish with those in undammed river segments in the same region.2. The objective of this study was to evaluate the effectiveness of fish translocation in promoting access to spawning areas through a behavioural approach using Prochilodus costatus as a study model in the São Francisco River, south-east Brazil.3. The reservoir acted as a barrier to the dispersal of translocated individuals with only a small fraction of the population able to locate lotic stretches in the tributaries. Individuals translocated to undammed stretches of river upstream of the reservoir exhibited movement behaviour that was markedly different from that of individuals native to this region. Translocated individuals mainly displayed an erratic pattern of movement between upstream and downstream stretches of river with no specific route. In contrast, local individuals made long-distance upstream spawning migrations and downstream return migrations to feeding sites during specific periods of the year. The results indicate that translocating individuals upstream of Três Marias damtends to be ineffective for the conservation of P. costatus in the region. The study showed that the behaviour of translocated individuals, a largely neglected factor for the tropical region, may be an additional barrier to the success of conservation programmes based on fish passage systems. For the population studied, the maintenance of a free-flowing stretch where fish are able to complete their life cycle is a more viable and effective alternative for conservation.

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Section: Introductionmentioning

confidence: 99%

“…The second approach for evaluating fish passage effectiveness consists of tracking fish movements both upstream and downstream of the dam (Antonio et al, 2007;Silva, 2012;Fries et al, 2019;Hahn et al, 2019a;Hahn et al, 2019b). In this case, translocated individuals are identifiable by some type of tag and tracked along the river.…”

Section: Introductionmentioning

confidence: 99%