Ichthyofauna of streams from the lower Iguaçu River basin, Paraná State, Brazil

Abstract The drainages of the Iguaçu River basin, as well as the main channel of the river, have peculiar characteristics resulting from geomorphological processes in this area, including the formation of the Iguaçu River Falls. This slope in the lower portion of the basin is a biogeographical barrier to many organisms. In this study was inventoried the fish fauna of streams of the lower Iguaçu River basin, evaluating possible differences in the species composition upstream and downstream of this biogeographical barrier. Sampling were conducted between 2004 and 2013, in five streams, three upstream and two downstream of the Iguaçu River Falls, using electrofishing. The nMDS analysis was run to investigate possible groupings of similar fauna between the streams sampled. The scores of this test were tested as to the significance of groupings with the Hotelling T2 test. The indicator value method (IndVal) was used to detect the distribution of species among the groups of the streams upstream and downstream of the Iguaçu River Falls. We collected 18,908 individuals of six orders, 11 families, and 40 species. Siluriformes and Characiformes had the highest species richness; Cyprinodontiformes presented the highest abundance. Considering the species recorded, 21 are considered natives to the Iguaçu River basin, including 15 endemic, wich were found only in streams upstream of the falls. Additional 18 species were verified only in the streams downstream of such barrier. Four species were common to both stretches. The axis 1 of the nMDS separated two groups: streams upstream (S1, S2 and S3) and streams downstream of the Iguaçu River Falls (S4 and S5). The indicator species analysis also indicated a distinction between the groups of streams, that were significantly different (Hotelling's T2 = 234.36, p ˂ 0.0001). The number of endemic species in the streams upstream of the Falls (15 spp.) evidences a significant effect of isolation promoted by the Iguaçu River Falls, and confirms the role of this barrier in the vicariant processes and endemism typical of this basin. These results emphasize the importance of conserving these ecosystems, once the extinction of species in this region means the irreversible loss of them.

Download Full-text

Fish fauna from the Paranapanema River basin, Brazil

Biota Neotropica ◽

10.1590/1676-0611-bn-2018-0707 ◽

2020 ◽

Vol 20 (1) ◽

Cited By ~ 4

Author(s):

Lucas Ribeiro Jarduli ◽

Diego Azevedo Zoccal Garcia ◽

Ana Paula Vidotto-Magnoni ◽

Armando Cesar Rodrigues Casimiro ◽

Norberto Castro Vianna ◽

...

Keyword(s):

River Basin ◽

Native Species ◽

Conservation Status ◽

Fish Fauna ◽

Main Channel ◽

Conservation Strategies ◽

Management Actions ◽

The Family ◽

Upper Paraná River ◽

Upper Paraná River Basin

Abstract: The Paranapanema River is an important, extensively explored tributary of the Upper Paraná River basin. The fish fauna of the Paranapanema River has been investigated since the 1990s; however, no study has characterized the richness of fish species throughout the basin, including the main channel of the river, marginal lagoons, its tributaries, and sub-tributaries. Thus, we performed a review with 90 independent studies conducted at the upper, middle, and lower sections of the basin. We recorded 225 species, of which 165 were native, and 60 were non-native. We found that 77% of the species within the basin are composed by Siluriformes and Characiformes. Cichliformes had a significant number of non-native species established in impoundment sections of the basin. Incidence-Based Estimators (Bootstrap and Chao 2) demonstrated that the richness of native species is still underestimated. Some native (e.g., Hypostomus ancistroides) and non-native species (e.g., Plagioscion squamosissimus) are widely distributed in the basin, while others had a more restricted distribution. Among the registered species, the family Bryconidae had the highest number of representatives with threatened conservation status. In addition, we observed that the Capivara Reservoir and its tributaries were the most sampled regions, with the majority of studies performed in the Lower Paranapanema basin. The species richness recorded in large tributaries, such as Tibagi, Cinzas, Congonhas, and Pirapó rivers is critical for maintaining the fish fauna in the Paranapanema River. Our contribution may be used to support management actions and conservation strategies, as well as to indicate regions in the basin that need to be better inventoried.

Download Full-text

Ichthyofauna in the last free-flowing river of the Lower Iguaçu basin: the importance of tributaries for conservation of endemic species

ZooKeys ◽

10.3897/zookeys.1041.63884 ◽

2021 ◽

Vol 1041 ◽

pp. 183-203

Author(s):

Suelen Fernanda Ranucci Pini ◽

Maristela Cavicchioli Makrakis ◽

Mayara Pereira Neves ◽

Sergio Makrakis ◽

Oscar Akio Shibatta ◽

...

Keyword(s):

Ictalurus Punctatus ◽

Endemic Species ◽

National Park ◽

Conservation Status ◽

Fish Fauna ◽

Hydroelectric Power Plant ◽

Main Channel ◽

Hydroelectric Power ◽

River Stretch ◽

Iguaçu River

The fish fauna from the Lower Iguaçu River and tributaries upstream of the Iguaçu Falls, the last free-flowing river stretch, were investigated. Twenty five sites in tributaries and the main channel were sampled between 2010 and 2016 using several kinds of fishing gear. The species were categorized according to their size, origin, and conservation status. Species richness and abundance in the main channel and tributaries were compared. In total, 87,702 specimens were recorded, comprising 76 species, 25 families, 53 genera, and eight orders. Characiformes and Siluriformes were the richest orders, representing 92% of the total specimens; Characidae, Cichlidae, Pimelodidae, and Loricariidae were the richest families. The fish fauna was composed of small and medium-sized species and included endemic (42%), autochthonous (24%), allochthonous (21%), and exotic (9%) species, as well as hybrids (4%). Significant differences in the relative numerical abundance of species were found among sites. Ancistrus mullerae and Rhamdia branneri (endemic) were indicator species for tributaries inside of Iguaçu National Park (INP), while Phalloceros harpagos (autochthonous) and Ictalurus punctatus (exotic) for tributaries outside of INP and Odontesthes bonariensis (allochthonous) for the main channel. The last dam-free stretch of the Lower Iguaçu River and tributaries upstream the Iguaçu Falls exhibits a rich endemic fish fauna, including some rare, endangered species (Steindachneridion melanodermatum, Gymnogeophagus taroba, and Psalidodon gymnogenys). These findings are essential to predict and understand the effects caused by the new Baixo Iguaçu Hydroelectric Power Plant and highlight the importance of tributaries and Iguaçu National Park for conservation of endemic species.

Download Full-text

Fish fauna in forested and rural streams from an ecoregion of high endemism, lower Iguaçu River basin, Brazil

Biota Neotropica ◽

10.1590/1676-0611-bn-2017-0459 ◽

2018 ◽

Vol 18 (3) ◽

Cited By ~ 10

Author(s):

Rosilene Luciana Delariva ◽

Mayara Pereira Neves ◽

Crislei Larentis ◽

Bruna Caroline Kotz Kliemann ◽

Mara Cristina Baldasso ◽

...

Keyword(s):

Species Richness ◽

River Basin ◽

Rural Areas ◽

Native Species ◽

Fish Fauna ◽

Land Uses ◽

Conservation Units ◽

Forested Areas ◽

Total Species ◽

Iguaçu River

Abstract The fish fauna of eight streams with different land uses of their watersheds (forested and rural areas) in the lower Iguaçu River basin was inventoried, in order to evaluate the composition and species richness. The fishes were sampled quarterly from May 2015 to February 2016, using the electrofishing technique. In total, 4,239 individuals were captured, belonging to six orders, 11 families and 26 species. The orders Siluriformes and Characiformes, and the families Characidae and Trichomycteridae were the most specious. Of the total species sampled, 65% were endemic to the Iguaçu River basin, four are not described and four are non-native. As expected to the Iguaçu River basin, the inventoried fauna revealed low richness and high endemism, however was highly nested within the species composition reported for main channel of Iguaçu River and their larger tributaries. The species recorded here corresponded to a subset of 24.5% of the 106 species documented for the basin. The streams presented different faunas, with only two species (Astyanax bifasciatus and Trichomycterus stawiarski) common to both forested and rural streams. In addition, higher species richness was recorded in streams inserted in conservation units. The presence of non-native species was more frequent in rural streams. These results highlight the importance of the preservation of forested areas in the watersheds of lower Iguaçu, which presents a peculiar fish fauna, along with several threats to biodiversity such as habitat loss by intensive agriculture use.

Download Full-text

Ichthyofauna of the Aiuruoca River basin, Minas Gerais, Brazil

Check List ◽

10.15560/8.6.1166 ◽

2012 ◽

Vol 8 (6) ◽

pp. 1166 ◽

Cited By ~ 3

Author(s):

Ruanny Casarim ◽

Marina Lopes Bueno ◽

Paulo Santos Pompeu

Keyword(s):

Community Structure ◽

Rainbow Trout ◽

Species Composition ◽

River Basin ◽

Fish Community ◽

Fish Fauna ◽

Main Channel ◽

Fish Community Structure ◽

Rainbow Trout Oncorhynchus Mykiss ◽

Main Factors

Although the Aiuruoca River is recognized as a very important area for fish fauna, the species composition of this river remains unknown or restricted to technical reports of licensing projects. The aim of this study was to describe the composition and distribution of the ichthyofauna in the Aiuruoca River basin. Fifty-eight collection points were sampled along the Aiuruoca River basin during 2010 and 2011, including 38 streams, 11 lagoons and 9 points along the Aiuruoca River main channel. A total of 8562 specimens were collected belonging to 6 orders, 15 families, 33 genera and 47 species. The pirapetinga fish (Brycon nattereri) is listed on Brazil’s endangered species, and the rainbow trout (Oncorhynchus mykiss) was the only exotic species captured. Altitude is one of the main factors that influence fish community structure in the Aiuruoca River basin, confirming its importance for fish conservation

Download Full-text

Debris-flow functioning and their contribution to sedimentary budgets: the Peynin subcatchment of the Guil River (Upper Queyras, Southern French Alps)

Landform Analysis ◽

10.12657/landfana.036.007 ◽

2018 ◽

Vol 36 ◽

pp. 71-84

Author(s):

Vincent Viel ◽

Monique Fort ◽

Candide Lissak ◽

Kevin Graff ◽

Benoît Carlier ◽

...

Keyword(s):

Main Channel ◽

Sediment Supply ◽

Climate Trends ◽

Sediment Delivery ◽

Strong Connectivity ◽

Recent Climate ◽

Erosion Area ◽

Geomorphological Processes ◽

To Come

The Peynin catchment (15 km2) is prone to catastrophic floods (June 1957 – Recurrence Interval R.I.>100 yr), June 2000 (R.I.-30 yr) with serious damages to infrastructure and buildings located at the outlet. In this paper, PIT tags tracers and Vensim modelling software are used to better assess the sediment delivery unsteadiness, and more specifically to evaluate the respective role of geomorphological processes on sediment supply during flood event. For the last 20 years, our results highlight a significant variability in sediment delivery from a tributary to another one. According to our studies, we suppose that two torrential tributaries of the Peynin river, the Peyronnelle and Three Arbres subcatchments (<2 km2, representing <15% of the Peynin catchment area) are responsible of 80% of the sediments observed at the outlet of the catchment. Several processes take a part of these sediment transfers, but the efficiency of the sediment cascade in this catchment can be explained by a strong connectivity between sediment erosion area and the main channel of the catchment. Debris and torrential flows triggered during high intensity meteorological event are actually effectively coupled in space and time and guarantee an important sediment supply able to reload the downstream part of the sediment cascade. Recent climate trends, marked by extremes, suggest consequently more damaging events to come, in a context of increasing vulnerable assets

Download Full-text

Diet and trophic structure of the fish fauna in a subtropical ecosystem: impoundment effects

Neotropical Ichthyology ◽

10.1590/s1679-62252013000400017 ◽

2013 ◽

Vol 11 (4) ◽

pp. 891-904 ◽

Cited By ~ 34

Author(s):

Rosilene Luciana Delariva ◽

Norma Segatti Hahn ◽

Elaine Antoniassi Luiz Kashiwaqui

Keyword(s):

Trophic Structure ◽

Feeding Habits ◽

Spatial Scales ◽

Fish Fauna ◽

Stomach Contents ◽

Trophic Guilds ◽

Before And After ◽

Temporal And Spatial ◽

Nmds Analysis ◽

Iguaçu River

This study examined the diet and trophic structure of the fish fauna, over temporal and spatial scales, as affected by the impoundment of the Iguaçu River in the region of Salto Caxias, Paraná State, Brazil. Sampling was conducted before (March 1997 - February 1998) and after the impoundment (March 1999 - February 2000), at four sampling sites. The stomach contents were analyzed by the volumetric method. The species could be organized in 10 trophic guilds: algivores, carcinophages, detritivores, herbivores, aquatic insectivores, terrestrial insectivores, invertivores, omnivores, piscivores, and planktivores; the first and last guilds were represented only in the post-impoundment period. Similarity patterns and feeding changes were summarized by a non-metric Multi-dimensional Scaling (nMDS) analysis and statistically tested by a Permutational multivariate analysis of variance (PERMANOVA). Most species showed feeding changes, except for the piscivores and detritivores. These changes were related to the temporal factor (impoundment phases), such as reduced intake of benthic organisms and allochthonous food, which were usually replaced by resources from the reservoir itself (algae, microcrustaceans, and fish), simplifying the food spectrum of the fish fauna. A different indicator of food resources (IndVal) corroborated these changes in the feeding of the species. The proportions of the trophic guilds evaluated based on the catch per unit of effort (CPUE) and tested by ANOSIM were significantly different before and after the impoundment. Herbivores and piscivores were the guilds that contributed (SIMPER) to these differences, especially the high increase in biomass of the piscivore guild after the impoundment. Variations in the abundance of trophic guilds were more directly related to changes in the feeding habits of the fish fauna than to increases in the number and biomass of the species that constitute these guilds.

Download Full-text

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

Check List ◽

10.15560/14.2.461 ◽

2018 ◽

Vol 14 (2) ◽

pp. 461-470 ◽

Cited By ~ 1

Author(s):

Andrea Bertora ◽

Fabián Grosman ◽

Pablo Sanzano ◽

Juan J. Rosso

Keyword(s):

River Basin ◽

Fish Species ◽

Surface Waters ◽

Fish Fauna ◽

Land Uses ◽

Pampa Plain ◽

Salado River ◽

Prairie Stream ◽

Representative Family

On the Pampa plain, one of the most productive modified areas of Argentina, important changes in land uses have drastically altered the landscape during the last decades. This has led to an increased deterioration of surface waters affecting fish that inhabit them. We provide a list of fish species inhabiting an unsurveyed prairie stream of this region. Environmental variables were measured and fish samplings were conducted in 3 sites of the Langueyú stream. A total of 15 species belonging to 10 families and 6 orders were collected. Characiformes and Siluriformes were the richest orders. Characidae was the most representative family. Species richness was highest when compared with other similar regional environments without connection with the Salado river basin. Most of the fish species collected are typical of the region but others are species which typically do not progress beyond the Salado river basin. The role of human intervention in fish species distribution is discussed.

Download Full-text