Fish fauna from the Languey&amp;uacute; basin, Argentina: a prairie stream in a heavily modified landscape

Bertora, Andrea; Grosman, Fabián; Sanzano, Pablo; Rosso, Juan José

doi:10.15560/14.2.461

Cited by 7 publications

(7 citation statements)

References 18 publications

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“…Fish assemblages of LS were composed by 16 species. All species previously reported for this stream (Bertora et al, 2018b) were collected plus the wolf fish Hoplias argentinensis .…”

Section: Discussionmentioning

confidence: 99%

“…At these latitudes, the Neotropical fish fauna represents a pauperised subset (Ringuelet, 1975) of the highly diversified assemblages observed at lower latitudes (Malabarba et al, 1998). A check list of the fish fauna of the LS was recently provided (Bertora et al, 2018b). A 15 species‐rich community with many tolerant species and one exotic was reported.…”

Section: Methodsmentioning

confidence: 99%

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Fish assemblage structure in a Neotropical urbanised prairie stream exposed to multiple natural and anthropic factors

Bertora

Grosman

Sanzano

et al. 2021

Ecology of Freshwater Fish

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A myriad of factors affect stream fish assemblages, and most of them are intimately regulated by surrounding land uses. One of the most pernicious impacts on streams is the release of urban effluents. Accordingly, understanding the fish assemblage patterns as well as the environmental drivers that modulate them in the context of urban streams which also are exposed to other land uses is mandatory. We evaluated the longitudinal patterns of fish assemblages in an urbanised Neotropical prairie stream exposed to downstream patches of different surrounding land uses. Several variables of water quality, in‐stream habitat and riparian corridors were measured, and their relationships with fish metrics were explored. A fish metric selection protocol was implemented, and several multivariate analyses were used. Three main patterns of fish response were observed. Assemblage‐level attributes as diversity, richness, biomass, number of families and trophic guilds and proportion of Characiformes and intolerant species were responsive to the natural gradient in habitat (pools) and riparian (riparian width) conditions expected in non‐impacted lotic ecosystems. Conversely, a downstream continuum of recovery in water quality (dissolved oxygen, conductivity, NO3:NH4 and bacteriological loads) and habitat structure (sediment depth) would influence the distribution of fish species regarding their environmental tolerance and habitat preferences. Finally, local habitat aspects (nitrites, submerged macrophytes, bare soil cover and bank incisions by livestock) seemed relevant for the trophic structure (omnivorous species) of fish assemblages. A complex natural and anthropic longitudinal scenario together with local disruptions imposed by surrounding land uses were directive for fish.

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“…Fish assemblages of LS were composed by 16 species. All species previously reported for this stream (Bertora et al, 2018b) were collected plus the wolf fish Hoplias argentinensis .…”

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Fish assemblage structure in a Neotropical urbanised prairie stream exposed to multiple natural and anthropic factors

Bertora

Grosman

Sanzano

et al. 2021

Ecology of Freshwater Fish

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“…Ichthyofauna surveys are important for the conservation of freshwater fishes at both short and long-term scales. These studies provide additional information about species' distribution (e.g., Valdiviezo-Rivera et al 2017, Bertora et al 2018, Delariva et al 2018, Honorio & Martins 2018, Oliveira-Silva et al 2018) -which, in turn, may assist in new assessments about their "conservation status" (e.g., Melo et al 2017). Additionally, surveys provide useful data for the establishment of freshwater protected areas (sensu Azevedo- Santos et al 2018a).…”

Section: Introductionmentioning

confidence: 99%

Ichthyofauna of streams of the Rio Sapucaí basin, upper Rio Paraná system, Minas Gerais, Brazil

et al. 2019

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The Rio Sapucaí basin, in Minas Gerais State, Brazil, is one of the many watersheds of the upper Rio Paraná system. Ichthyofauna surveys in this basin, in general, are scarce. In addition, small rivers and streams of the region have been targets of anthropogenic actions (e.g., pollution) - which suggest that more ichthyological studies must be performed within the watershed. In this study we provide a survey of species that occur within three streams of the lower Rio Sapucaí basin. Samples were collected in April, July, and November 2017 and in May 2018. Collections resulted in 349 individuals belonging to 28 species, five orders, and 12 families. Among our findings are three putatively undescribed species and the first record of Oligosarcus argenteus and Pareiorhina hyptiorhachis within the Rio Paraná system.

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“…Beach seine net was constructed with 15 m long wings (10 mm mesh) and a 2 m long bag (5 mm mesh). These gear devices were probed to successfully collect all fish species intended to be collected in this biogeographic region (Bertora et al, 2018a). Trammel nets were left overnight and 2 to 4 seining were performed at each site during each sampling date.…”

Section: Field and Laboratory Activitiesmentioning

confidence: 99%

Longitudinal patterns in distribution of native and non-native fish species in a regulated temperate Neotropical river

et al. 2021

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Aim We evaluated the longitudinal patterns in distribution of native and non-native fish species in a hydrologically fragmented and environmentally variable lowland temperate river. Methods Four sites representing contrasting habitat and environmental conditions were sampled: a clear water reservoir, a turbid water lagoon and two river reaches with clear and turbid waters each. Environmental variables were measured in situ and in the laboratory. Fishes were sampled using trammel and beach seine nets. Results Two main environmental scenarios were identified: the upstream reaches, with colder, clearer and nutrient-oxygen poor waters (reservoir and its downstream river) and the downstream reaches, where turbidity, dissolved oxygen, water temperature, conductivity and nutrients largely increased (lagoon and its downstream river). Fourteen species with a high non-native/native (4:10) ratio were collected. Non-native species (NNS) were confined to lentic conditions, where the silverside Odontesthes bonariensis dominated. Native species (NS) better thrive in lotic conditions where the turbid scenario further favored tolerant species. Environmental conditions also seemed to influence the distribution of NNS. Fish assemblage structure considering either, all species, NNS or NS significantly differed among sampled reaches and habitat (lentic-lotic) conditions. Total fish abundance was higher in lentic reaches. Species richness and diversity were favored by the turbid scenario. Beta diversity was mostly explained by the replacement component revealing the substitution of species as the main pattern of variation. Water conductivity, nitrates and dissolved oxygen were the most important predictor variables in the best and most frequent explanatory models of fish assemblage structures. Conclusions Our results revealed that a low diversified Neotropical fish fauna is disrupted by habitat fragmentation due to the creation of artificial impoundments and the introduction of NNS. Environmental conditions further modulate the fish assemblage structure by affecting the distribution of species where tolerant species were favored by turbid, nutrient-rich waters with higher conductivity and pH.

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Fish fauna from the Langueyú basin, Argentina: a prairie stream in a heavily modified landscape

Cited by 7 publications

References 18 publications

Fish assemblage structure in a Neotropical urbanised prairie stream exposed to multiple natural and anthropic factors

Fish assemblage structure in a Neotropical urbanised prairie stream exposed to multiple natural and anthropic factors

Ichthyofauna of streams of the Rio Sapucaí basin, upper Rio Paraná system, Minas Gerais, Brazil

Longitudinal patterns in distribution of native and non-native fish species in a regulated temperate Neotropical river

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