Introductions of non-native fishes into a heavily modified river: rates, patterns and management issues in the Paranapanema River (Upper Paraná ecoregion, Brazil)

Garcia, Diego Azevedo Zoccal; Britton, J. Robert; Vidotto‐Magnoni, Ana Paula; Órsi, Mário Luís

doi:10.1007/s10530-017-1623-x

Cited by 46 publications

(36 citation statements)

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“…However, our results did not detect a difference between lotic and lentic environments in the Araguari cascade system. One explanation for this would be that dams modify both environments, and the increase of non‐native fish species richness over time is a trend observed in many modified ecosystems (Garcia, Britton, Vidotto‐Magnoni, & Orsi, ; Ortega, Júlio, Gomes, & Agostinho, ; Poff, Olden, Merritt, & Pepin, ). Moreover, another possibility is that connections between the reservoirs in Araguari River by short lotic stretches facilitate the spread of non‐native species across the landscape.…”

Section: Discussionmentioning

confidence: 99%

Temporal changes in fish diversity in lotic and lentic environments along a reservoir cascade

Loures

2019

Freshwater Biology

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Long‐term modifications in hydrological conditions due to river damming result in varied effects on fish diversity, which can be stronger in a reservoir cascade. Therefore, we assessed changes in fish diversity over a 28‐year period, in a series of reservoirs along the Araguari River Basin, a Neotropical drainage in Brazil, in both lentic environments (reservoirs) and the lotic stretches between them. We used linear mixed models to assess long‐term changes in fish diversity. Diversity was measured as α diversity (fish species richness) and β diversity (Jaccard's and Raup–Crick's dissimilarity index). Beta diversity was then partitioned into turnover (species replacement) and nestedness (species loss). To understand fish species replacement along the cascade, we modelled turnover with four covariates: age, richness of native and non‐native fish species, and longitudinal position of sampling site along the cascade. The reduction of total richness and the increase in non‐native richness were related to reservoir age. These effects were similar in both lotic and lentic environments, with no significant difference between them. We also observed a decrease in native fish richness over time, with a slight tendency for lentic environments to lose more species than lotic environments. Dissimilarity in fish assemblage increased over time and β Raup–Crick results corroborated those derived from β Jaccard, yielding similar significant temporal trends. Changes in fish species composition occurred predominantly due to turnover, compared to nestedness. We observed a greater species loss in reservoirs, suggesting that the transformation from a lotic environment into a lentic had greater impact on fish assemblages than the flow regulation of the lotic stretches downstream of the dams. Our results suggest that species replacement can be explained mainly by the increase of non‐native fish richness, followed by the longitudinal position along the cascade in an upstream–downstream direction, and reservoir age. This study reveals that, even after 2 decades of monitoring, we still observe important changes in fish assemblages, demonstrating the importance of long‐term monitoring to assess biodiversity. Our findings reinforce the importance of long‐term fish monitoring schemes for the investigation of the effects of non‐native fish species on native fish assemblages.

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Section: Discussionmentioning

confidence: 99%

Temporal changes in fish diversity in lotic and lentic environments along a reservoir cascade

Loures

2019

Freshwater Biology

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“…The increase of fish‐cage farming in Jurumirim is estimated at 2460 t year −1 , considering the current rate of production and growth potential relative to new aquaculture parks, in which the Nile tilapia Oreochromus nilotucus (L. 1758) is the main farmed species (Montanhini et al ., ). Data on intentional fish stocking indicate 7,102,057 individuals belonging to six non‐native fish species ( Astronotus crassipinnis (Heckel 1840), Cyprinus carpio L. 1758, Sorubim lima (Bloch & Schneider 1801), Schizodon borellii (Boulenger 1900), Triportheus angulatus (Spix & Agassiz 1829), O. niloticus and Hoplias lacerdae Miranda Ribeiro 1908) were released into the reservoir between 1978 and 1992 (Garcia et al ., ).…”

Section: Introductionmentioning

confidence: 97%

“…The increase of fish-cage farming in Jurumirim is estimated at 2460 t year −1 , considering the current rate of production and growth potential relative to new aquaculture parks, in which the Nile tilapia Oreochromus nilotucus (L. 1758) is the main farmed species (Montanhini et al, 2015). (Garcia et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Species richness and functional structure of fish assemblages in three freshwater habitats: effects of environmental factors and management

Queiroz‐Sousa

Keith

David

et al. 2019

Journal of Fish Biology

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In this study, the inverted trophic hypothesis was tested in the freshwater fish communities of a reservoir. The distribution of fish species in three freshwater habitats in the Jurumirim Reservoir, Brazil, was examined using both species richness and the relative proportions of different trophic groups. These groups were used as a proxy for functional structure in an attempt to test the ability of these measures to assess fish diversity. Assemblage structures were first described using non‐metric multidimensional scaling (NMDS). The influence of environmental conditions for multiple fish assemblage response variables (richness, total abundance and abundance per trophic group) was tested using generalised linear mixed models (GLMM). The metric typically employed to describe diversity; that is, species richness, was not related to environmental conditions. However, absolute species abundance was relatively well explained with up to 54% of the variation in the observed data accounted for. Differences in the dominance of trophic groups were most apparent in response to the presence of introduced fish species: the iliophagous and piscivorous trophic groups were positively associated, while detritivores and herbivores were negatively associated, with the alien species. This suggests that monitoring functional diversity might be more valuable than species diversity for assessing effects of disturbances and managements policies on the fish community.

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“…The species is also considered a trophic generalist with a wide food spectrum (Hahn, Almeida, & Luz, 1997). Invasive populations are now present in both free‐from‐dam and damming environments within the Upper Paraná basin (Garcia, Britton, Vidotto‐Magnoni, & Orsi, 2018; Júlio Júnior et al, 2009; Tonella et al, 2018). The lotic environments are in the floodplain and are characterized by high levels of environmental heterogeneity (Agostinho, 1997), whereas the damming environments are strongly influenced by hydroelectric dams (Garcia et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Seasonal and habitat variations in diet of the invasive driftwood catfishTrachelyopterus galeatusin a Neotropical river basin, Brazil

et al. 2020

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The characteristics of successful invaders often include generalist traits that enable adaptation to new environments through plastic responses, including their diet. The use of trophic resources of invasive driftwood catfish Trachelyopterus galeatus of the Upper Paraná River basin, Brazil, were studied with diet analysis and stable isotopic niche metrics based on δ15N and δ13C to test differences between a free‐from‐dam and damming population, and between wet and dry season. Stomach content analyses revealed significant differences between the populations. The diet of the riverine free‐flowing river population was macroinvertebrate dominated, with Coleoptera and Lepidoptera prominent. In the damming population, diet was largely plant based, although Coleoptera was also prominent. Trophic niche breadth comparisons revealed a larger niche in the free‐from‐dam population versus the damming population that was independent of season. In both sites had dietary differences between the wet and dry season according to stomach contents analyses, although these were less prominent according to stable isotope metrics. Therefore, the diet of this invader is relatively general and plastic, enabling their exploitation of the varying availability of food resources between free‐from‐dam and damming river sections, and between wet and dry season.

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Introductions of non-native fishes into a heavily modified river: rates, patterns and management issues in the Paranapanema River (Upper Paraná ecoregion, Brazil)

Cited by 46 publications

References 50 publications

Temporal changes in fish diversity in lotic and lentic environments along a reservoir cascade

Temporal changes in fish diversity in lotic and lentic environments along a reservoir cascade

Species richness and functional structure of fish assemblages in three freshwater habitats: effects of environmental factors and management

Seasonal and habitat variations in diet of the invasive driftwood catfishTrachelyopterus galeatusin a Neotropical river basin, Brazil

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