Ecological and life history traits of Hemiodus orthonops in the invasion process: looking for clues at home

Agostinho, Ângelo Antônio; Suzuki, Harumi Irene; Fugi, Rosemara; Alves, Diego Corrêa; Tonella, Lívia Helena; Espindola, Luis A.

doi:10.1007/s10750-014-2030-2

Cited by 41 publications

(29 citation statements)

References 56 publications

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“…As stated previously, this transparency has favored submerse aquatic macrophytes colonization and by consequence the establishment of periphytic algae, mainly filamentous algae (Murakami et al, 2009;Neif et al, 2014). Macrophytes and filamentous algae were not food items observed in its native areas (Agostinho et al, 2015), nor in the tributaries (i.e. Ivinhema and Baía).…”

Section: Discussionmentioning

confidence: 91%

“…The species is endemic to the Paraná-Paraguay basin and showed rapid colonization and high abundance in the invaded area, reaching about 10% of catching effort in the subsequent six years (Agostinho et al, 2015). Despite being considered a detritivorous species in its natural range (Corrêa et al, 2009), the consumption of aquatic macrophytes and the dominance of periphytic algae in their diet were found only in the invaded region, mainly in the rio Paraná channel (Agostinho et al, 2015). On the other hand, the consumption of detritus/sediment was prominent in Ivinhema and Baía subsystems (Agostinho et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Feeding and body condition of an invasive fish species under different environmental conditions

et al. 2016

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Diet, energy density (ED) and relative condition factor (Kn) were used to investigate the energetic assimilation of the invasive fish Hemiodus orthonops under different environmental condition of the upper rio Paraná floodplain. Samples were taken in June and September 2013 and 2014. Nutrient content was determined for sediment. The diet was combined in the Food Index (IAi%), ED was expressed in Kcal/g of dry weight and Kn was calculated by: K n = Wt/We, where Wt is the total weight and We the expected weight. Detritus/sediment prevailed in the stomachs of specimens from Ivinhema and Baia, while Algae was the main item in Paraná, reflecting the resource availability. ED and Kn from Ivinhema specimens were the greatest, consequence of the quality of food and lower spent on searching and handling food. The Paraná specimens showed lower ED values, but higher Kn values, due to algae consumption, a nutrient-rich resource. Baia presented high aluminum concentration on the sediment and the lower pH values, which contribute to reduce the nutritional value of the detritus and the ED and Kn values of their specimens. In conclusion, H. orthonops is capable to take advantage of the resources availability in the different environments, ensuring their establishment.Análise de dieta, densidade energética (DE) e fator de condição relativo (Kn) foram utilizados para investigar a assimilação energética do peixe invasor Hemiodus orthonops sob diferentes condições ambientais da planície de inundação do alto rio Paraná. As coletas ocorreram em junho e setembro de 2013 e 2014. O teor de nutrientes foi obtido para o sedimento. A dieta foi combinada no Índice Alimentar (IAi%), a DE foi expressa em Kcal/g de peso seco, o Kn foi calculado através de: K n = Wt/We, onde Wt é o peso total e We o peso esperado. Detrito/sedimento prevaleceu nos estômagos dos espécimes do Ivinhema e Baía, enquanto Alga foi o principal item no Paraná, refletindo a disponibilidade de recursos. A DE e Kn dos indivíduos do Ivinhema foram os maiores, consequência da qualidade do alimento e do menor gasto em procura e manipulação do alimento. Os indivíduos do Paraná registraram os menores valores de DE, mas elevados valores de Kn, devido ao consumo de alga, um recurso alimentar rico em nutrientes. Baía apresentou elevada concentração de alumínio no sedimento e reduzidos valores de pH, o que contribuiu com a redução do valor nutricional do detrito e dos valores de DE e Kn dos indivíduos. Concluindo, H. orthonops é capaz de se beneficiar da disponibilidade de recursos nos diferentes ambientes, garantindo seu estabelecimento.

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Section: Discussionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Feeding and body condition of an invasive fish species under different environmental conditions

et al. 2016

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“…According to Agostinho et al (2015), H. orthonops, a migratory species from the Paraguay and Paraná rivers basin, invaded the Upper Paraná River in 2002, through the "Piracema Canal (ITAIPU)" transposition mechanism, and is currently established. In turn, P. platana, whose origin is still unknown, is probably already established as well (Langeani et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

“…In order to evaluate the type of reproductive strategy of the fish species using these environments during reproduction, the larvae identified at least at the genus level were classified according to the reproductive guild to which they belong, namely: non-migratory or short-distance migratory, with external fertilization and no parental care (NMFESC); non-migratory or short-distance Fialho et al (2000), Suzuki et al (2004), Smith et al (2013) and Agostinho et al (2015).…”

Section: Samplingmentioning

confidence: 99%

Importance of dam-free stretches for fish reproduction: the last remnant in the Upper Paraná River

et al. 2017

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Aim: This study uses the abundance of fish eggs and larvae to evaluate the importance of the main channel of the Paraná River and the adjacent areas of the floodplain, in the last dam-free stretch in the Brazilian territory, for the spawning and development of fish of different reproductive guilds, in order to obtain subsidies to assist in the management and conservation policies of this area, focusing on the maintenance of dam-free areas. Methods: Data were taken quarterly from August 2013 to May 2015, in 25 sites, grouped into three biotopes: main channel, tributaries and lagoons. Possible spatial variations in fish spawning and development as well as composition and structure of larvae were evaluated. Results: Higher densities of eggs were found in tributaries (Paracaí and Amambai rivers) and greater densities of larvae were observed in lagoons (Saraiva). Significant differences in composition and structure of larvae were detected only between sampling stations. As for taxonomic composition, 29 taxa were recorded, mostly non-migratory. However, long-distance migratory were also widely distributed, such as Brycon orbignyanus, Pseudoplatystoma corruscans, Prochilodus lineatus, Piaractus mesopotamicus and Rhaphiodon vulpinus, as well as invasive species Platanichthys platana and Hemiodus orthonops. In turn, Salminus brasiliensis presented low occurrence. Conclusions: This study evidenced that different species spawn in the region, mainly in tributaries, and their eggs and larvae are transported to the main channel of the Paraná River and adjacent lagoons, to complete their early development. The capture of larvae of important migratory species suggests that this environment still exhibits suitable conditions for their reproduction, mainly due to the presence of dam-free tributaries. Also, they emphasize the importance of the integrity of these environments for the maintenance of the regional fish fauna, and it is extremely important the monitoring of reproduction of the most endangered species, as well as of invasive species.

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“…The installation of fish passages in dams, with the aim to preserve migratory species, may pose an additional threat to the biota from upstream stretches by increasing the dispersion of non-native species. This may occur when the dam separates distinct native faunas along the watershed, as observed in the Paraná River (Agostinho et al, 2015). In the case of Paraná River, the Itaipu Reservoir, filled in 1982, covered the Sete Quedas Falls, which separated distinct ichthyofauna provinces.…”

Section: Introductionmentioning

confidence: 99%

<b>Genetic variability and evidence of founder effect in <i>Hemiodus orthonops</i> (Characiformes: Hemiodontidae) from the upper Paraná River basin, Brazil

Marques

Renesto

2017

Acta Sci. Biol. Sci.

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ABSTRACT. Hemiodus orthonops is a small fish of the Hemiodontidae family, order Characiformes, with a maximum of 25 cm standard length. Until recently, H. orthonops was an endemic species from the Paraná-Paraguay basin and it was absent from the upper Paraná River basin. Since 2008, it has started to be collected in the upper Paraná River, representing up to 10% of catches. Two population samples of H. orthonops from two localities of the upper Parana River basin (Porto Camargo and Porto Figueira) were analyzed using the allozymes electrophoresis technique. Twenty-one enzymatic loci were detected. The population sample from Porto Camargo displayed a genetic variability (He = 0.1061) higher than that from Porto Figueira (He = 0.0580) and homozygote excess in both of them. The F ST value (0.2081) indicated genetic structure. The excess of homozygotes in both samples was probably due to founder effect in the population.Keywords: Allozymes, fish, genetic distance, heterozygosity, protein polymorphism.Variabilidade genética e evidência do efeito do fundador em Hemiodus orthonops (Characiformes: Hemiodontidae) da bacia do alto rio Paraná, Brasil

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Ecological and life history traits of Hemiodus orthonops in the invasion process: looking for clues at home

Cited by 41 publications

References 56 publications

Feeding and body condition of an invasive fish species under different environmental conditions

Feeding and body condition of an invasive fish species under different environmental conditions

Importance of dam-free stretches for fish reproduction: the last remnant in the Upper Paraná River

<b>Genetic variability and evidence of founder effect in <i>Hemiodus orthonops</i> (Characiformes: Hemiodontidae) from the upper Paraná River basin, Brazil

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