Fish passage ladders from Canoas Complex - Paranapanema River: evaluation of genetic structure maintenance of Salminus brasiliensis (Teleostei: Characiformes)

Lopes, Carla Martins; Almeida, Fernanda Simões de; Órsi, Mário Luís; Britto, Sandro Geraldo de Castro; Sirol, Rodolfo Nardez; Sodré, Leda Maria Koelblinger

doi:10.1590/s1679-62252007000200006

Cited by 42 publications

(45 citation statements)

References 19 publications

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“…At Lajeado Dam, fish migrating downstream were virtually absent from the ladder (Agostinho et al, 2011), and the abundance of eggs and larvae declined dramatically along the reservoir (Agostinho et al, 2007b). The similar trends observed at Peixe Angical and Lajeado, together with other evaluations (Agostinho et al, 2007b;Lopes et al, 2007;Suzuki et al, 2011), indicate that large Neotropical dams may fail to allow the downstream passage of young and adults.…”

Section: Discussionmentioning

confidence: 65%

Deficient downstream passage through fish ladders: the case of Peixe Angical Dam, Tocantins River, Brazil

Pelicice

Agostinho

2012

Neotrop. ichthyol.

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Downstream passage through fish ladders and other facilities remains largely uninvestigated in South America. In view of this concern, we monitored ascending and descending fish movements through the fish ladder at Peixe Angical Dam, upper Tocantins River, Brazil, between September 2009 and August 2010. To investigate the extent of downstream passage, the fish fauna was sampled monthly (i) at sites upstream and downstream from the dam and (ii) inside the ladder. To distinguish between ascending and descending movements, the fish ladder remained open (permanent water flow), but a screen blocked the complete passage of fish in both directions. The results of the study indicated that the ladder restricts fish movements in both directions. Few species were found to use the ladder (31 out of 119 species recorded in the area). Moreover, monitoring revealed that downstream passage is even more limited. Only 18 species were recorded moving downstream. In addition, few fish attempted to move downstream during the year; of all fish captured in the ladder (n = 17,335), only 4% were descending. Species performing exclusive downstream movements were numerically rare or infrequent. Most downstream captures involved only four species. We emphasize that several species performed one-way upstream movements or showed a high density of ascending fish. Consequently, the numerical ratio between ascending and descending fish (ind./m 2 ) showed high positive values throughout the year (644:1 on average, considering all species); migratory species showed higher ratios (1069:1). The results of the study show that the facility fails to support the downstream passage of migratory and non-migratory fishes. We conclude that the fish ladder at Peixe Angical Dam does not play a conservation role and may complicate alternative conservation efforts.A passagem descendente de peixes em mecanismos de transposição permanece pouco investigada na América do Sul. Inspirado nessa falha, o presente estudo monitorou a escada de peixes instalada na barragem da UHE Peixe Angical, alto rio Tocantins, entre setembro de 2009 e agosto de 2010. Para investigar a extensão da passagem rio abaixo, a fauna de peixes foi amostrada mensalmente em (i) locais acima e abaixo da barragem, e (ii) dentro da escada. Para identificar corretamente movimentos ascendentes e descendentes dentro da escada, o mecanismo permaneceu aberto (fluxo permanente de água), mas uma tela impediu a passagem completa dos peixes em ambas as direções. Os resultados indicam que a escada é restritiva ao movimento dos peixes em ambos os sentidos, considerando que poucas espécies tiveram acesso ao mecanismo (de um total de 119 espécies na área, apenas 31 ocorreram na escada). O monitoramento revelou, entretanto, que a passagem descendente é consideravelmente mais limitada; apenas 18 espécies foram registradas descendo o mecanismo. Além disso, poucos peixes tentaram descer a escada ao longo do ano; de todos os peixes capturados na escada (n = 17,335), apenas 4% desempenhava movimentos descendentes. ...

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Section: Discussionmentioning

confidence: 65%

Deficient downstream passage through fish ladders: the case of Peixe Angical Dam, Tocantins River, Brazil

Pelicice

Agostinho

2012

Neotrop. ichthyol.

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“…Similar results were reported by Ferreira et al (2014) in an AFLP marker analysis of the sedentary species Geophagus brasiliensis in the Laranjinha River. Lopes et al (2007) studied the migratory species Salminus brasiliensis and sampled at fish ladders of Canoas I, Canoas II, and Rio Paranapanema. They showed that the greater part of molecular variance (AMOVA) was found within groups (~98%) with low levels of structuring between different localities (F ST = 0.018).…”

Section: Discussionmentioning

confidence: 99%

Genetic analysis of five sedentary fish species in middle Laranjinha River (upper Paraná River basin): A case study

Frantine‐Silva¹,

Ferreira²,

Nascimento³

et al. 2015

Genet. Mol. Res.

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ABSTRACT. Most studies of diversity and genetic structure in neotropical fish have focused on commercial species from large rivers or their reservoirs. However, smaller tributaries have been identified as an important alternative migratory route, with independent pools of genetic diversity. In this context, the present study aimed to evaluate genetic diversity and structure in five neotropical fish species from a region of Laranjinha River in the upper Paraná River basin. PCR-RAPD (random amplified polymorphic DNA) markers were used to characterize around 40 individuals of each species distributed upstream and downstream of Corredeira Dam that interrupts the river. The descriptive index of genetic diversity (P = 30.5-82%; H E 0.122-0.312) showed that the populations have acceptable levels of genetic diversity. The values for Nei's genetic distance (D N min 0.0110 and max 0.0306) as well as the genetic structure index and the analysis of molecular variance (AMOVA, ϕ ST min 0.0132 and max 0.0385) demonstrated low, but significant levels of genetic structure. Bayesian analysis of assignment found two k clusters, including several individuals with mixed ancestry for all populations from the five species analyzed. These findings along with historical data on rainfall and the low dimensions of the dam studied here support the hypothesis that periodic floods enable the transit of individuals between different localities mitigating the differentiation process between populations.

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“…The R ST values under the SMM are expected to be greater than the F ST values under the IAM (Slatkin, 1995), although the inverse has been observed in some fish species (e.g., Pereira et al, 2009). Low indexes of F ST have been observed in other studies with characiforms, such as in Colossoma macropomum (Santos et al, 2007), Piaractus mesopotamicus (Calcagnotto & DeSalle, 2009;Iervolino et al, 2010), Prochilodus argenteus (Hatanaka et al, 2006;Sanches et al, 2012), Prochilodus costatus (Carvalho-Costa et al, 2008), Prochilodus lineatus (Revaldaves et al, 1997) and Salminus brasiliensis (Lopes et al, 2007).…”

Section: Genetic Diversity and Lack Of Genetic Structuringmentioning

confidence: 90%

The roles of marginal lagoons in the maintenance of genetic diversity in the Brazilian migratory fishes Prochilodus argenteus and P. costatus

Melo

Sato²,

Foresti

et al. 2013

Neotrop. ichthyol.

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The rio São Francisco basin contains many endemic species, such as Prochilodus argenteus and P. costatus, which have great commercial importance. However, information about the main recruitment sites and genetic studies containing extensive sampling of these species are scarce. To investigate the roles of the marginal lagoons in the maintenance of genetic variability and in the population structure, we analyzed six microsatellite loci in nine sampling groups of P. argenteus and five sampling groups of P. costatus. Our results showed high levels of genetic variability and low values of genetic differentiation for P. argenteus (F ST = 0.008, P < 0.05) and for P. costatus (F ST = 0.031, P < 0.05). In addition, high values of gene flow combined with a small genetic distance suggest the presence of a single population for each species in the middle rio São Francisco basin. Moreover, putative migration routes involving marginal lagoons during the reproductive season could be detected, confirming the importance of these nurseries in the lifecycle of these species. Our results also indicate the necessity of adequate management of the fish resources and the conservation of the floodplains in the rio São Francisco basin.A bacia do rio São Francisco contém muitas espécies endêmicas, tais como Prochilodus argenteus e P. costatus, os quais têm grande importância comercial. Entretanto, informações sobre as principais áreas de recrutamento e estudos genéticos contendo uma extensa amostragem dessas espécies no rio São Francisco são escassas. Para investigar o papel das lagoas marginais na manutenção da variabilidade genética e na estruturação populacional dessas espécies, nós analisamos seis loci microssatélites em nove grupos amostrais de P. argenteus e cinco grupos amostrais de P. costatus. Nossos resultados revelaram altos níveis de variabilidade genética para ambas as espécies e valores baixos de diferenciação genética para P. argenteus (F ST = 0.008, P < 0.05) e P. costatus (F ST = 0.031, P < 0.05). Adicionalmente, valores altos de fluxo gênico combinados com a distância genética baixa sugerem a presença de uma única população para cada espécie no médio rio São Francisco. Possíveis rotas migratórias envolvendo lagoas marginais durante o período reprodutivo puderam ser detectadas, confirmando a importância das lagoas marginais no ciclo de vida dessas espécies. Nossos resultados também indicaram a necessidade de um manejo adequado dos recursos pesqueiros e a conservação das várzeas na bacia do rio São Francisco.

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Fish passage ladders from Canoas Complex - Paranapanema River: evaluation of genetic structure maintenance of Salminus brasiliensis (Teleostei: Characiformes)

Cited by 42 publications

References 19 publications

Deficient downstream passage through fish ladders: the case of Peixe Angical Dam, Tocantins River, Brazil

Deficient downstream passage through fish ladders: the case of Peixe Angical Dam, Tocantins River, Brazil

Genetic analysis of five sedentary fish species in middle Laranjinha River (upper Paraná River basin): A case study

The roles of marginal lagoons in the maintenance of genetic diversity in the Brazilian migratory fishes Prochilodus argenteus and P. costatus

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