scholarly journals Influence of urbanization on stream fish assemblages in three microbasins in the Upper Paraná River Basin

2023 ◽  
Vol 83 ◽  
Author(s):  
F. S. Ferreira ◽  
J. C. J. Solórzano ◽  
Y. R. Súarez
Keyword(s):  
Environmental Variables ◽  
Fish Assemblages ◽  
Water Velocity ◽  
Direct Effects ◽  
Environmental Filters ◽  
Urbanization Level ◽  
Upper Paraná River ◽  
Upper Paraná River Basin ◽  
Environmental Integrity ◽  
Stream Fish Assemblages

Abstract The colonization pattern of fish assemblages in streams is often studied in the context of environmental filters. On the other hand, when fish assemblages are subjected to anthropogenic effects, variables associated with environmental quality assume more importance. Therefore, this work evaluated the richness and composition of fish from streams sampled at different urbanization levels, aiming to determine any direct effects on the structure of fish assemblages. To accomplish this, samples were collected from 2003 to 2011 at 31 sites distributed among 3 microbasins in the Rio Ivinhema Basin, Alto Rio Paraná. Based on environmental variables, physicochemical of the water and analysis of the use and occupation of the soil, the microbasins were classified into different urbanization levels (low, medium and high). A total of 4,320 individuals were sampled, out of which 57 fish species were recorded. Sampled sites with medium urbanization level presented higher richness compared to sampled sites with high urbanization level which presented lower richness. Species richness in these sites was explained mainly by water temperature and water velocity. Results confirmed that urbanization does directly affect environmental integrity, which, in turn, can lead to the homogenization of stream assemblages.

scholarly journals Influence of environmental variables and anthropogenic perturbations on stream fish assemblages, Upper Paraná River, Central Brazil

2009 ◽  
Vol 7 (1) ◽  
pp. 31-38 ◽  
Author(s):  
Nicelly B. Araújo ◽  
Francisco L. Tejerina-Garro
Keyword(s):  
Water Temperature ◽  
Fish Assemblage ◽  
Environmental Variables ◽  
Fish Assemblages ◽  
Water Velocity ◽  
Channel Width ◽  
Central Brazil ◽  
Parana River ◽  
Upper Paraná River ◽  
Anthropogenic Perturbations

The Ouvidor River, a tributary of the Upper Paraná River, drains areas covered by cerrado vegetation in Central Brazil. We collected data for environmental variables (water temperature, dissolved oxygen, pH, conductivity, turbidity, water velocity, luminosity, channel substrate and width) and anthropogenic perturbations (industry, reservoirs, urban areas) that may structure the fish assemblage in ten stream sites of the Ouvidor River basin. In each stream we delimited one 50 m long site where fish were captured by electrofishing and abiotic data were collected every two month between August 2004 and June 2005. Co-inertia analysis indicated that pH, water velocity, channel width and water temperature most strongly structured the fish assemblages. The interactions of water velocity and channel width with the fish assemblage were not directly affected by wet and dry seasons but the opposite was true for pH and water temperature.

Role of environmental and spatial processes structuring fish assemblages in streams of the eastern Amazon

2018 ◽  
Vol 69 (2) ◽  
pp. 243 ◽  
Author(s):  
N. L. Benone ◽  
R. Ligeiro ◽  
L. Juen ◽  
L. F. A. Montag
Keyword(s):  
Environmental Factors ◽  
Environmental Variables ◽  
Fish Assemblages ◽  
Flood Plain ◽  
Habitat Isolation ◽  
Flood Plains ◽  
Β Diversity ◽  
Flood Period ◽  
Stream Fish Assemblages ◽  
Stream Biota

Considering the increasing importance of analysing spatial structure in ecological studies, the aims of the present study were to test whether fluvial distances and environmental factors are important drivers of the β-diversity of stream fish assemblages, and whether β-diversity is different in distinct hydrological periods. Specimens were sampled at 33 stream sites in the eastern Amazon. Eight environmental variables were measured at each site and fluvial distances between pairs of stream sites were determined. Environmental variables were the main factors structuring fish assemblages in both periods. However, fluvial distances were important only during the flood period. This can be related to the formation of extensive flood plains in this period, which increases connectivity between streams, breaking habitat isolation and increasing the regional signal for fish species. The higher correlation of β-diversity with environmental variables during the flood period may be related to decreased dispersal limitations and intermediate dispersal. Finally, β-diversity was higher during the flood period, highlighting the importance of the heterogeneity of the flood plain to stream biota. The results of the present study indicate that spatial and environmental factors play complementary roles in structuring fish assemblages in Amazon streams, and that β-diversity was affected by changes in the habitat connectivity experienced in different hydrological periods.

scholarly journals Effects of a small natural barrier on the spatial distribution of the fish assemblage in the Verde River, Upper Paraná River Basin,Brazil

2016 ◽  
Vol 76 (4) ◽  
pp. 851-863 ◽  
Author(s):  
J. C. Silva ◽  
É. A. Gubiani ◽  
P. A. Piana ◽  
R. L. Delariva
Keyword(s):  
Spatial Distribution ◽  
Species Richness ◽  
River Basin ◽  
Fish Assemblage ◽  
Fish Assemblages ◽  
Parana River ◽  
Verde River ◽  
Upper Paraná River ◽  
Upper Paraná River Basin ◽  
Natural Barrier

Abstract Geographical barriers influence species distribution and play an important role in the segregation of fish assemblages. The present study aims to test the influence of a small natural barrier on the spatial distribution of fish species in the Verde River, Upper Paraná River Basin, Brazil, considering two biotopes: upstream and downstream of the Branca Waterfall. We observed the highest species richness downstream of the Branca Waterfall, which also had the highest number of exclusive species. Richness, evenness, and abundance varied significantly among biotopes. The composition and structure of the fish assemblage differed between biotopes, which were characterized by different indicator species, mainly downstream of the Branca Waterfall. Physical and chemical variables and geographical distance between sites were not responsible for the differences observed. Hence, the present study shows that small barriers can also be crucial in structuring fish fauna and play a key role in the segregation of fish assemblages.

scholarly journals Fishes from first order streams of lower Paranapanema and Ivaí rivers, upper Paraná River basin, Paraná, Brazil

Check List ◽  
2012 ◽  
Vol 8 (6) ◽  
pp. 1158 ◽  
Author(s):  
Vivian De Mello Cionek ◽  
Patricia Almeida Sacramento ◽  
Naiara Zanatta ◽  
Rafaela Priscila Ota ◽  
Daiany De Fatima Corbetta ◽  
...  
Keyword(s):  
River Basin ◽  
Fish Assemblages ◽  
Paraná River ◽  
Conservation Units ◽  
Specific Level ◽  
First Order ◽  
Parana River ◽  
Upper Paraná River ◽  
Upper Paraná River Basin ◽  
Paraná River Basin

This study was developed as a research of first order streams fish assemblages located in two Conservation Units in Northwestern Paraná, Brazil, with the purpose of providing information about ichthyofauna composition of these water bodies while they are still under protection. There were captured 2,557 individuals belonging to six orders, nine families and 10 species in three streams. The most abundant species were Phalloceros harpagos (44%) from Conceição stream, Astyanax aff. paranae (14%) and P. harpagos (12%) from Jurema stream, and Melanorivulus apiamici (9%) from Conceição stream. Trichomycterus sp. could not be identified into a specific level, meaning it can represent an undescribed species to science, registered for the first time at the upper Paraná River basin.

scholarly journals Modeling and mapping fish abundance across wadeable streams of Illinois, USA, based on landscape-level environmental variables

2016 ◽  
Vol 73 (7) ◽  
pp. 1031-1046 ◽  
Author(s):  
Yong Cao ◽  
Leon Hinz ◽  
Brian Metzke ◽  
Jeffrey Stein ◽  
Ann Holtrop
Keyword(s):  
Fish Species ◽  
Environmental Variables ◽  
Fish Assemblages ◽  
Common Species ◽  
Natural Environments ◽  
Soil Permeability ◽  
Distribution Maps ◽  
Wadeable Streams ◽  
Stream Fish Assemblages ◽  
Landscape Level

To effectively conserve and restore stream ecosystems, we need to better understand the distribution and abundance of individual fish species in relation to natural environments and anthropological stressors. In this study, we modeled the abundance of 97 fish species in small wadeable streams of Illinois, USA, based on random forests regression and landscape-level environmental variables. Model R2 values for intermediately common species were higher than for common species, but highly variable among rare ones. Models for 50 species reached R2 of 0.2–0.70 and were tested with a separate set of samples and applied to unsampled wadeable reaches to show the population hotspots of each species across the state. Furthermore, we evaluated the importance of individual environmental variables to a given fish species as well as the directional responses of each species to top 10 key predictors. Climate and land use were the best predictors for most species, followed by topography, geology, and soil permeability. Spatial connection of a stream also was associated with a large number of species. These findings improved our understanding of the relationships between fish species and landscape environments. The distribution maps could guide resource management, restoration, and monitoring of stream fish assemblages.

scholarly journals The influence of environmental variables on the functional structure of headwater stream fish assemblages: a study of two tropical basins in Central Brazil

2015 ◽  
Vol 13 (2) ◽  
pp. 349-360 ◽  
Author(s):  
Rodrigo Assis Carvalho ◽  
Francisco Leonardo Tejerina-Garro
Keyword(s):  
Fish Species ◽  
Environmental Conditions ◽  
Environmental Variables ◽  
Fish Assemblages ◽  
Headwater Stream ◽  
Stream Fish ◽  
Tropical Region ◽  
Dissimilarity Matrix ◽  
Species Trait ◽  
Stream Fish Assemblages

We investigated functional patterns of fish assemblages of two adjacent basins (Araguaia and Tocantins) to test whether their headwater stream fish assemblages are more functionally (dis)similar than expected by chance and whether these (dis)similarities are related to differences of environmental conditions between basins. We used an analysis of similarities (ANOSIM) on a functional dissimilarity matrix to test for (dis)similarities between fish assemblages of both basins. We performed RLQ and fourth-corner analyses to determine fish species trait-environment relationship. Our results revealed functional dissimilarities between fish assemblages of both basins and significant species trait-environment relationships, suggesting that environmental conditions are driving such dissimilarities. Inter-basin dissimilarities are mainly driven by altitudinal and water temperature gradients, whereas dissimilarities among streams within the basins are influenced by channel depth, turbidity and conductivity. These five environmental variables mostly affected six fish species traits (body mass, water column position, substrate preference, parental care, foraging locality and migration) in different manners. This study is an attempt to understand functional trends of fish assemblages in a tropical region that remains poorly known but severely threatened.

scholarly journals Influence of an artificial dam on the fish assemblage of a Neotropical stream

2016 ◽  
Vol 38 (3) ◽  
pp. 305
Author(s):  
Dyego Leonardo Ferraz Caetano ◽  
Rafael Rogério Rosa ◽  
Verônica Rodrigues de Moraes ◽  
Daniela Ribas Jané ◽  
Alexandre Fernandes Oliveira da Silva
Keyword(s):  
Cluster Analysis ◽  
Species Composition ◽  
Fish Assemblage ◽  
Fish Assemblages ◽  
Southern Brazil ◽  
Ecological Processes ◽  
Upper Paraná River ◽  
Upper Paraná River Basin ◽  
Ecological Parameters ◽  
Neotropical Stream

The objective of this study was to evaluate the influence of a dam on the ecological parameters of the fish assemblages of a stream of second order of the upper Paraná River basin, southern Brazil. Samplings of abiotic data and ichthyofauna occurred quarterly between September 2012 and June 2013. Were collected 3,128 individuals in six orders, eight families and 13 species. The Cluster analysis (Jaccard) based on species composition indicated the separation of the sampling units into two groups, demonstrating the dissimilarity between upstream and downstream units. The artificial dam was characterized as a discontinuity factor for diversity patterns and ecological processes related to biota. Thus, this study has indications that the creation of dams can significantly affect the richness and abundance of fish species of small lotic systems, as streams, by modifying their environments. 

Widespread convergence in stream fishes

2021 ◽  
Author(s):  
Luke M Bower ◽  
David E Saenz ◽  
Kirk O Winemiller
Keyword(s):  
Fish Assemblages ◽  
Structural Complexity ◽  
High Water ◽  
Water Velocity ◽  
Stream Fishes ◽  
Evolutionary Patterns ◽  
Selective Pressures ◽  
The World ◽  
Degree Of Convergence ◽  
Stream Fish Assemblages

Abstract Convergent evolution, the evolution of similar phenotypes among distantly related lineages, is often attributed to adaptation in response to similar selective pressures. Here, we assess the prevalence and degree of convergence in functional traits of stream fishes at the microhabitat scale in five zoogeographical regions across the world. We categorized species by microhabitat, water velocity and preference for substrate complexity and calculated the prevalence of convergence, degree of convergence and functional diversity for each category. Among species occupying similar microhabitats of small, low-gradient streams, 34% had combinations of convergent traits. Convergence occurred at higher rates than expected by chance alone, implying that adaptation to similar environmental conditions often resulted in similar evolutionary patterns along multiple niche dimensions. Two of the microhabitat groupings had significantly convergent species represented in all zoogeographical regions. Fishes occupying microhabitats with high water velocity and low structural complexity generally occupied a restricted morphospace and exhibited greater prevalence and higher degrees of convergence. This suggests that water velocity and habitat structural complexity interact, selecting a restricted distribution of trait distributions and higher degrees of convergence in stream fish assemblages. Furthermore, these results suggest that microhabitat features in streams select for fish trait distributions in a fairly predictable and deterministic manner worldwide.

Spatio-temporal variation of fish assemblages in Babai River of Dang district, Province No. 5, Nepal

Our Nature ◽  
2019 ◽  
Vol 17 (1) ◽  
pp. 19-30
Author(s):  
Punam G.C ◽  
Jash Hang Limbu
Keyword(s):  
Carbon Dioxide ◽  
Temporal Variation ◽  
Water Temperature ◽  
Environmental Variables ◽  
Fish Assemblages ◽  
Water Velocity ◽  
Free Carbon ◽  
Spatial And Temporal Variation ◽  
Fish Assemblage Structure ◽  
Free Carbon Dioxide

Spatial and temporal variation of fish assemblages were investigated seasonally from October 2018 to May 2019. Fish assemblages were agglomerated with environmental variables both to spatial and temporal scales. Water temperature, dissolved Oygen, free carbon-dioxide, pH and water velocity of water of each site were measured. Based on analysis of similarities (ANOSIM), fish assemblages were significantly different in spatial variation but not in temporal variation. A total of 1,024 individuals belonging to 5 orders, 9 families and 15 genera and 24 species were collected. The dominated species were Puntius sophore, followed by P. terio, P. ticto and Barilius bendelisis. The Redundancy Analysis (RDA) vindicated that environmental variables of water temperature, pH, water velocity and free carbon-dioxide were found to be contributed variables to shape the fish assemblage structure of Babai River. The cluster analysis delineated that similarity between fish species decreases as the distance of sites increased.

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