scholarly journals Out of the pot and into the fire: Explaining the vulnerability of an endangered small headwater stream fish to black-bass Micropterus spp. invasion

2018 ◽  
Vol 92 (4) ◽  
pp. 1035-1050 ◽  
Author(s):  
B. R. Ellender ◽  
O. L. F. Weyl ◽  
M. E. Alexander ◽  
A. M. Luger ◽  
L. A. J. Nagelkerke ◽  
...  
Keyword(s):  
Headwater Stream ◽  
Stream Fish ◽  
Black Bass

Organization patterns of headwater-stream fish communities in the Upper Paraguay–Paraná basins

Hydrobiologia ◽  
2007 ◽  
Vol 583 (1) ◽  
pp. 241-250 ◽  
Author(s):  
Sabrina B. Valério ◽  
Yzel Rondon Súarez ◽  
Thiago R. A. Felipe ◽  
Karina K. Tondato ◽  
Lidiani Q. L. Ximenes
Keyword(s):  
Fish Communities ◽  
Headwater Stream ◽  
Stream Fish

scholarly journals Taxonomic and phylogenetic beta diversity in headwater stream fish communities of the Paraná and Paraguai River basins

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Gabriel Nakamura ◽  
Wagner Vicentin ◽  
Yzel Rondon Súarez
Keyword(s):  
Environmental Factors ◽  
Beta Diversity ◽  
Environmental Gradients ◽  
Fish Communities ◽  
River Basins ◽  
Water Velocity ◽  
Headwater Stream ◽  
Stream Fish ◽  
Evolutionary Mechanisms ◽  
Species Sorting

ABSTRACT Patterns of species replacement and richness differences along environmental gradients or ecoregions shed light on different ecological and evolutionary mechanisms acting on community structure. Communities of aquatic ecosystems of different watersheds are supposed to host distinct species and lineages. Quantifying and understanding the degree to which these differences are affected by environmental and biogeographical factors remains an open question for these environments, particularly in the Neotropical region. We investigated patterns of taxonomic and phylogenetic composition of headwater streams of the Paraná and Paraguai River basins to understand how local and biogeographical factors affect the assembly of fish communities. We also quantified taxonomic and phylogenetic beta diversity by decomposing them into nestedness and turnover components. We found that local environmental factors are the main factors influencing the composition of stream fish communities. Whereas pH affected both taxonomic and phylogenetic turnover, water velocity was responsible for phylogenetic turnover and pH was the main driver of phylogenetic nestedness. Our results indicate an effect of local environmental factors in determining the structure of headwater stream fish communities through a combination of a species sorting mechanism (water velocity and pH) and phylogenetic habitat filtering (pH).

scholarly journals Effects of deforestation on headwater stream fish assemblages in the Upper Xingu River Basin, Southeastern Amazonia

2019 ◽  
Vol 17 (1) ◽  
Author(s):  
Paulo Ilha ◽  
Sergio Rosso ◽  
Luis Schiesari
Keyword(s):  
Land Cover ◽  
River Basin ◽  
Fish Assemblages ◽  
Headwater Stream ◽  
Assemblage Structure ◽  
Stream Fish ◽  
Taxonomic Structure ◽  
Fish Assemblage Structure ◽  
Xingu River ◽  
Stream Fish Assemblages

ABSTRACT The expansion of the Amazonian agricultural frontier represents the most extensive land cover change in the world, detrimentally affecting stream ecosystems which collectively harbor the greatest diversity of freshwater fish on the planet. Our goal was to test the hypotheses that deforestation affects the abundance, richness, and taxonomic structure of headwater stream fish assemblages in the Upper Xingu River Basin, in Southeastern Amazonia. Standardized sampling surveys in replicated first order streams demonstrated that deforestation strongly influences fish assemblage structure. Deforested stream reaches had twice the fish abundance than reference stream reaches in primary forests. These differences in assemblage structure were largely driven by increases in the abundance of a handful of species, as no influence of deforestation on species richness was observed. Stream canopy cover was the strongest predictor of assemblage structure, possibly by a combination of direct and indirect effects on the provision of forest detritus, food resources, channel morphology, and micro-climate regulation. Given the dynamic nature of change in land cover and use in the region, this article is an important contribution to the understanding of the effects of deforestation on Amazonian stream fish, and their conservation.

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 Headwater stream fish fauna from the Upper Paranapanema River basin

2016 ◽  
Vol 16 (3) ◽  
Author(s):  
Mauricio Cetra ◽  
George Mendes Taliaferro Mattox ◽  
Fabio Cop Ferreira ◽  
Rayssa Bernardi Guinato ◽  
Fernando Vieira Silva ◽  
...  
Keyword(s):  
River Basin ◽  
Fish Species ◽  
Fish Communities ◽  
Fish Fauna ◽  
Dry Season ◽  
Headwater Stream ◽  
Paraná River ◽  
Stream Fish ◽  
Parana River ◽  
Paraná River Basin

Abstract The Paraná River basin has about 600 fish species. In the Upper Paraná, 310 fish species were recorded, with 52 species were registered in the streams and headwaters of the Paranapanema River. The aim of this study was to characterize the stream fish communities in the Upper Paranapanema River basin. Samplings were conducted with electrofishing during the dry season in the year of 2014. The collection effort consisted of 30 streams stretches. As a result, 41 species of stream fish were recorded in the Upper Paranapanema River basin, distributed in 26 genera, 11 families and 7 orders. Thirty-nine percent of the species can be considered rare, 41% intermediate and 20% common. We captured approximately eight species by stream stretch and the estimated richness (Schao2) was 40 ± 6 species. Around 40% of the individuals had less than 50 mm in length.

Ecological impacts of small hydropower plants on headwater stream fish: from individual to community effects

2014 ◽  
Vol 25 (2) ◽  
pp. 295-306 ◽  
Author(s):  
Lluís Benejam ◽  
Sandra Saura-Mas ◽  
Mònica Bardina ◽  
Carolina Solà ◽  
Antoni Munné ◽  
...  
Keyword(s):  
Headwater Stream ◽  
Ecological Impacts ◽  
Stream Fish ◽  
Community Effects ◽  
Small Hydropower ◽  
Hydropower Plants

scholarly journals Resilience of imperilled headwater stream fish to an unpredictable high-magnitude flood

Koedoe ◽  
2015 ◽  
Vol 57 (1) ◽  
Author(s):  
Bruce R. Ellender ◽  
Olaf L.F. Weyl
Keyword(s):  
Size Structure ◽  
Natural Disturbance ◽  
Headwater Stream ◽  
Base Flow ◽  
Stream Fish ◽  
Eastern Cape ◽  
Range Restriction ◽  
Flood Peak ◽  
Water Abstraction ◽  
High Magnitude

Headwater stream fish communities are increasingly becoming isolated in headwater refugia that are often cut off from other metapopulations within a river network as a result of nonnative fish invasions, pollution, water abstraction and habitat degradation downstream. This range restriction and isolation therefore makes them vulnerable to extinction. Understanding threats to isolated fish populations is consequently important for their conservation. Following a base-flow survey, a high-magnitude flood (peak flow of 1245 m-3s-1) provided an opportunity to investigate the response of endangered Eastern Cape redfin Pseudobarbus afer populations to a natural disturbance in the Waterkloof and Fernkloof streams, two relatively pristine headwater tributaries of the Swartkops River system within the Groendal Wilderness Area, Eastern Cape Province, South Africa. Pseudobarbus afer had limited distributions, occupying 3 km in both the Fernkloof and Waterkloof streams. Fish population assessments before and after the flood event indicated that there were no longitudinal trends in P. afer abundance before or after the flood, but overall abundance post-flooding in the Fernkloof stream was higher. There were no noticeable changes in P. afer size structure pre- and post-flood. Pseudobarbus afer showed resilience to a major flooding event most likely related to evolution in river systems characterised by environmental stochasticity.Conservation implications: This research provides insight into the population level responses of native headwater stream fishes to unpredictable natural disturbance. Of particular relevance is information on their ability to withstand natural disturbances, which provides novel information essential for their conservation and management especially as these fishes are already impacted by multiple anthropogenic stressors.

scholarly journals Corrigendum: Using genetics to prioritise headwater stream fish populations of the Marico barb, Enteromius motebensis Steindachner 1894, for conservation action

Koedoe ◽  
2017 ◽  
Vol 59 (1) ◽  
Author(s):  
Kerry-Ann Van der Walt ◽  
Ernst R. Swartz ◽  
Darragh J. Woodford ◽  
Olaf L.F. Weyl
Keyword(s):  
Headwater Stream ◽  
Fish Populations ◽  
Stream Fish ◽  
Conservation Action

No abstract available.

The effect of excluding plant litter on the aquatic hyphomycete conidia in a headwater stream.

2003 ◽  
Vol 54 (3-4) ◽  
pp. 249-260 ◽  
Author(s):  
Vladislav Gulis ◽  
Keller Suberkropp
Keyword(s):  
Plant Litter ◽  
Headwater Stream
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