Genetic evaluation of migratory fish: Implications for conservation and stocking programs

Pimentel, Juliana da Silva Martins; Ludwig, Sandra; Resende, Leonardo Cardoso; Brandão-Dias, Pedro F P; Pereira, Adriana Heloísa; Abreu, Nazaré Lúcio de; Rosse, Izinara Cruz; Martins, Ana Paula Vimieiro; Lopes, João de Magalhães; Santos, Gilmar B.; Alves, Carlos Bernado Mascarenhas; Kalapothakis, Evanguedes

doi:10.1002/ece3.6231

Cited by 8 publications

(5 citation statements)

References 54 publications

(63 reference statements)

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“…The Três Marias reservoir appears to act as a barrier to the more significant movements of P. costatus individuals, probably because it is a novel habitat lacking the environmental and hydraulic cues required to guide translocated individuals to river stretches that are more suitable for spawning and recruitment. Moreover,Pimentel et al (2020) found little genetic exchange among P. costatus populations that inhabit different tributaries of the Três Marias reservoir, reinforcing the notion that large reservoirs may act as a barrier to the more significant movements of migratory fish species.…”

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confidence: 70%

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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confidence: 70%

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

Lopes

Alves²,

Peressin

2021

Aquatic Conservation

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“…Besides, the genetic methods have been also used to estimate the migration and gene flow (Almada et al 2017 ; Castilho, Cunha, Faria, Velasco, & Robalo, 2017 ), improving our understanding about the demography and evolution life‐history studies of migratory fish populations (Mattingsdal et al, 2019 ; Pavlova et al, 2017 ). Especially in cases that there were habitat loss and fragmentation of riverbeds that influence not only the behavior but also the population dynamics ( Pimentel & Ludwig, in press ), thus, the genetics have been complementary implemented to ecological knowledge (Piorski et al, 2008 ; Savary et al, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

“…The genetic structure of the population of P. costatus in the São Francisco River basin has been recently investigated ( Pimentel et al, in press ). However, the life history and the interactions and feedback between the environmental stochastic events and evolutionary mechanisms (herein threatened as eco‐evolutionary processes; i.e., Pelletier, Garant, & Hendry, 2009 ) that have shaped the current pattern population structure have not been clarified.…”

Section: Introductionmentioning

confidence: 99%

Eco‐evolutionary factors that influence its demographic oscillations in Prochilodus costatus (Actinopterygii: Characiformes) populations evidenced through a genetic spatial–temporal evaluation

Ludwig

Pimentel²,

Resende

et al. 2023

Evolutionary Applications

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The human activity impact on wild animal populations is indicated by eco-evolutionary and demographic processes, along with their survival and capacity to evolve; consequently, such data can contribute toward enhancing genetic-based conservation programs. In this context, knowledge on the life-history and the eco-evolutionary processes is required to understand extant patterns of population structure in Prochilodus costatus a Neotropical migratory fish that has been threatened due to loss and fragmentation of its natural habitat since 1960s promoted by the expansion of hydroelectric power plant construction programs. This study evaluated the eco-evolutionary parameters that cause oscillations in the demography and structure of P. costatus populations. An integrated approach was used, including temporal and spatial sampling, next-generation sequencing of eight microsatellite loci, multivariate genetic analysis, and demographic life-history reconstruction. The results provided evidence of the complex interplay of ecological-evolutionary and human-interference events on the life history of this species in the upper basin. In particular, spawning wave behavior might have ecological triggers resulting in an overlapping of distinct genetic generations, and arising distinct migratory and nonmigratory genetic patterns living in the same area. An abrupt decrease in the effective population size of the P. costatus populations in the recent past (1960-80) was likely driven by environment fragmentation promoted by the construction of the Três Marias hydropower dam. The low allelic diversity that resulted from this event is still detected today; thus, active stocking programs are not effective at expanding the genetic diversity of this species in the river basin. Finally, this study highlights the importance of using mixed methods to understand spatial and temporal variation in genetic structure for effective mitigation and conservation programs for threatened species that are directly affected by human actions.

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“…É importante considerar que a transposição também pode resultar na quebra de barreiras físicas naturais presentes na bacia do Rio São Francisco, o que poderia impactar negativamente a diversidade genética, estrutura populacional e, principalmente, o fluxo gênico (migração) (e.g. PIMENTEL et al, 2020).…”

Section: Indroduçãounclassified

Ictiofauna em três reservatórios do Rio Apodi-Mossoró, semiárido brasileiro, antes da transposição do Rio São Francisco

Oliveira,

Peretti,

Novaes

et al. 2024

REGNE

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O projeto de Transposição do Rio São Francisco poderá afetar os reservatórios receptores devido à modificação das características ambientais e a possível introdução de novas espécies, ocasionado a homogeneização biótica e das características da água. Este estudo teve como objetivo analisar a composição de peixes em três reservatórios (Santa Cruz, Umari e Pau dos Ferros) da bacia do Rio Apodi-Mossoró antes da transposição. A amostragem foi realizada trimestralmente em vários pontos, utilizando redes de emalhar. Os peixes foram identificados e avaliados quanto a sua origem (nativos, alóctones e exóticos). Para avaliar a eficácia da metodologia de captura, foram geradas curvas de acumulação de espécies para cada reservatório, estimando a riqueza de espécies ao longo dos meses. Foram registradas 22 espécies pertencentes a 11 famílias e três ordens, sendo 81,82% nativas, 13,64% alóctones e 4,54% exóticas. A ordem Characiformes foi a mais representativa, seguida por Perciformes e Siluriformes. As famílias mais diversas foram Characidae, Cichlidae e Loricariidae. Houve similaridade na abundância de espécies nativas, alóctones e exóticas entre os reservatórios. Considerando a escassez de estudos sobre a composição taxonômica em ecossistemas semiáridos, os resultados deste estudo fornecem uma referência importante para futuras pesquisas sobre a conservação de peixes nativos.

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Genetic evaluation of migratory fish: Implications for conservation and stocking programs

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 8 publications

References 54 publications

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

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

Eco‐evolutionary factors that influence its demographic oscillations in Prochilodus costatus (Actinopterygii: Characiformes) populations evidenced through a genetic spatial–temporal evaluation

Ictiofauna em três reservatórios do Rio Apodi-Mossoró, semiárido brasileiro, antes da transposição do Rio São Francisco

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