A massive invasion of fish species after eliminating a natural barrier in the upper rio Paraná basin

Júnior, H.F. Júlio; Tós, Claudenice Dei; Agostinho, Ângelo Antônio; Pavanelli, Carla Simone

doi:10.1590/s1679-62252009000400021

Cited by 156 publications

(62 citation statements)

References 35 publications

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“…Hoplias sp2 is a native species from the Upper Paraná River and Hoplias sp1 was introduced in this area after the formation of the Itaipu Reservoir and consequent flooding of Sete Quedas Falls, which formed a natural barrier between two hydrographic regions, and thus many endemic species of the lower stretch successfully colonized the Upper Paraná River (Pazza and Júlio Júnior 2003, Júlio Júnior et al 2009, Hauser and Benedito 2012. Samplings of fish tissues were performed quarterly from March to December 2007, using gill nets with different mesh sizes (2.4 to 16 cm between opposite knots), exposed on the banks of the sampling sites for 24 hours and inspected every eight hours.…”

Section: Methodsmentioning

confidence: 99%

Isotopic niches of sympatric native and exotic fish species in a Neotropical floodplain

Philippsen

Hauser

Benedito

2015

An. Acad. Bras. Ciênc.

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This study investigated the isotopic niches of two fish species, one exotic and one native. It was hypothesized that these species would show little or no isotopic niche overlap. This hypothesis was tested with the isotopic niche concept and the trophic Layman's metrics. A considerable isotopic niche overlap was observed between the species, mainly for the exotic that showed the greater percentage of overlapping, indicating an interspecific competition for food resources. Layman's metrics also showed this species probably exploits a more specific array of food resources when compared with the native species. The native species probably has the ability to exploit a wider array of resources, highlighted by the higher values given for the Layman's metrics. The juveniles and adults of native species showed minor overlapping between the isotopic niches. This indicates that they have probably adopted different foraging strategies, minimizing intraspecific competition. Evidences that the exotic species explores a narrower range of resources and that the native species has a greater isotopic niche and possibly suffer less intraspecific competition, indicates that the native species can tolerate the presence of the exotic species and promote survival and maintenance of its population even under possible competition effects imposed by the exotic species.

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Section: Methodsmentioning

confidence: 99%

Isotopic niches of sympatric native and exotic fish species in a Neotropical floodplain

Philippsen

Hauser

Benedito

2015

An. Acad. Bras. Ciênc.

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“…The second regards the species' success in colonizing new environments, as verified in the Upper Paraná River floodplain, where L. platymetopon currently figures among the most abundant fish species (Luiz et al 2004, Agostinho et al 2004, Morales et al 2009). This species had spread from the middle Paraná River after the removal of the natural barrier of the Sete Quedas Falls, when it was flooded by the damming of the Itaipu reservoir in 1982 (Agostinho et al 1992, 1995, Luiz et al 2004, Júlio Júnior et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Relative abundance and reproductive tactics of a Loricariidae species at Saraiva Lagoon, Ilha Grande National Park, MS-PR, Brazil

et al. 2011

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Abstract:This study aimed to evaluate population abundance patterns and the main events in the reproductive cycle of Loricariichthys platymetopon at Saraiva Lagoon, Ilha Grande National Park, MS-PR, Brazil. Monthly samplings were conducted from October 2004 to September 2005 in three sections of the lagoon: entrance, middle and end, which resulted in the capture of 175 individuals. Spatial and temporal variation in abundance was obtained through CPUE (number of captured individuals/1000 m 2 of gillnets in 12 hours). The reproductive tactics considered were: duration, time and location of spawning, oocyte diameter and fecundity. The highest relative abundance was recorded in February, in the middle section of the lagoon, and the reproductive period lasted from September to February. The prevalence of females with spent ovaries and at rest in the following months indicated that reproductive activity ceased during autumn and winter. We observed that reproduction was high at the end section of the lagoon. The recorded mean oocyte diameter was 1.67 (SD ± 0.76) mm, mean absolute fecundity was 962.1 (SD ± 382.48) oocytes, and relative fecundity was 7.60 (SD ± 2.25) oocytes/g and 5.13 (SD ± 0.75) oocytes/cm. These tactics, probably are related to the settlement of L. platymetopom in Saraiva A variação espaço-temporal na abundância foi avaliada através da CPUE (nº de indivíduos capturados/1000 m 2 rede em 12 h de exposição). As táticas reprodutivas avaliadas foram duração, época e local de desova, diâmetro de ovócitos e fecundidade. A maior abundância relativa foi registrada em fevereiro, na região média da lagoa e o período reprodutivo estendeu-se de setembro a fevereiro. A prevalência de fêmeas com ovários esgotados e em repouso nos meses subseqüentes indicou que a atividade reprodutiva cessou no outono e inverno. Observou-se que a reprodução foi acentuada na região final da lagoa. O diâmetro médio de ovócitos registrado foi 1,67 (SD ± 0,76) mm, a fecundidade absoluta média 962,1 (SD ± 382,48) ovócitos e a fecundidade relativa 7,60 (SD ± 2,25) ovócitos/g e 5,13 (SD ± 0,75) ovócitos/cm. Essas táticas muito provavelmente, devem estar relacionadas à ocupação da lagoa Saraiva por L. platymetopom, bem como de outros biótopos da planície de inundação do alto rio Paraná. Palavras-chave: peixes, distribuição, diâmetro de ovócitos, fecundidade, período reprodutivo.

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“…K. moenkhausii was recorded in the Upper Paraná River basin only after the construction of the Itaipu hydroelectric power dam in 1982 [6]. The Itaipu Reservoir inundated an area of about 1350 km 2 [51] that included the Sete Quedas Falls, a natural and effective barrier that was the limit of the hydrographic basins of the Lower and Upper Paraná Rivers [6,52]. The inundation of Sete Quedas falls moved the barrier between these two hydrographic basins to 150 Km below the Itaipu Dam, allowing the mixing of species from the two basins.…”

Section: Discussionmentioning

confidence: 99%

“…The inundation of Sete Quedas falls moved the barrier between these two hydrographic basins to 150 Km below the Itaipu Dam, allowing the mixing of species from the two basins. At present, at least 33 species initially limited to the Lower Paraná River basin have successfully colonized the Upper Paraná River basin, including K. moenkhausii [52].…”

Section: Discussionmentioning

confidence: 99%

Knodus moenkhausii (Characiformes: Characidae): one fish species, three hydrographic basins - a natural or anthropogenic phenomenon?

Souza¹,

Oliveira²,

Pereira³

2015

DNA Barcodes

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We used the DNA barcoding technique (COI and CytB markers) combined with GMYC analysis to characterize the genetics of the widely distributed Neotropical fish species Knodus moenkhausii from three different isolated hydrographic basins. Despite the fact that most of the Neotropical hydrographic basins have been isolated for millions of years, species could be shared between basins due to natural events (stream capture) or anthropogenic activities. Recent surveys, however, have shown that many widely distributed species are actually species complexes divided into previously unrecognized cryptic species. In this study, we tested the hypothesis that K. moenkhausii from three hydrographic basins represent a single panmictic species and discuss the most likely explanation of its present geographical distribution. The GMYC analysis revealed that all specimens of K. moenkhausii represent a single species: the intra- and intergroup minimum K2P genetic distances for both genes were zero and haplotypes were shared among the three hydrographic basins. This suggests there has been recent interchange of K. moenkhausii throughout the three hydrographic basins. It is likely that this is due to recent human activities, either the transposition of natural barriers or intentional introduction or accidental escape due to the ornamental fish trade.

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A massive invasion of fish species after eliminating a natural barrier in the upper rio Paraná basin

Cited by 156 publications

References 35 publications

Isotopic niches of sympatric native and exotic fish species in a Neotropical floodplain

Isotopic niches of sympatric native and exotic fish species in a Neotropical floodplain

Relative abundance and reproductive tactics of a Loricariidae species at Saraiva Lagoon, Ilha Grande National Park, MS-PR, Brazil

Knodus moenkhausii (Characiformes: Characidae): one fish species, three hydrographic basins - a natural or anthropogenic phenomenon?

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