Heterogeneity of macrophyte banks affects the structure of fish communities in flooded habitats of the Amazon Basin

2021 ◽  
Vol 55 (1) ◽  
pp. 215-226
Author(s):  
Flávia Alessandra Silva Nonato ◽  
Thaisa Sala Michelan ◽  
Pâmela Virgolino Freitas ◽  
Calebe Maia ◽  
Luciano Fogaça de Assis Montag
Keyword(s):  
Amazon Basin ◽  
Fish Communities

scholarly journals EFFECTS OF ENVIRONMENTAL FEATURES ON FISH ASSEMBLAGE STRUCTURES IN THE MACHADO RIVER, AMAZON BASIN, BRAZIL

2021 ◽  
Vol 9 (1) ◽  
pp. 52-65
Author(s):  
Raniere Sousa ◽  
Alexandro Florentino ◽  
Rodrigo Amaral ◽  
Severino Lima
Keyword(s):  
Amazon Basin ◽  
Fish Assemblages ◽  
Abiotic Factors ◽  
Fish Communities ◽  
Chemical Properties ◽  
Abundant Species ◽  
Explanatory Variables ◽  
Physiochemical Parameters ◽  
Small Streams ◽  
Significant Difference

In this study, we examined the influence of the environmental characteristics of three microbasins of the Machado River on the distribution of fish assemblages in order to predict if its fish communities are influenced by abiotic factors. Sampling was conducted in first order streams in the microbasins of the Machado River, state of Rondônia, Brazil. In each stream, we selected two 150 m-long stretches on the main channel. The fish were sampled with different sizes of nets, stored in plastic bags, and taxonomically identified. At each site, the physiochemical parameters of the water (temperature, dissolved oxygen, pH, and electrical conductivity) were measured. Thus, abundance, richness and Hill’s diversity were estimated. The Permutational Multivariate Analysis of Variance (Permanova) was applied to determine the effect in fish abundance, richness and diversity, considering microbasins, physio-chemical water and seasons as explanatory variables. A distance-based redundancy analysis (dbRDA)was performed to determine the influence of physio-chemical properties of the water across the three microbasins and their effect on fish composition. We sampled a total of 6,432 individuals belonging to 4 orders, 19 families, and 56 species. Aequidens tetramerus, Serrapinnus cff. microdon and Serrapinnus aff. notomelas were the most abundant species. Conductivity was the only explanatory variable in which a significant difference was detected for the three response variables. The dbRDA indicated that 44.57% of the total variance was explained by the variables used and were significantly correlated with the abundance and composition of the ichthyofauna (F = 1.88, p = 0.035), conductivity and pH were the most relevant factors. A significant association between fish communities and abiotic factors supports the hypothesis that broad-scale patterns in fish communities in Amazonian small streams are, at least in part, structured by abiotic conditions.

A Method for Evaluating the Impacts of Reservoir Operation on Fish Communities

2007 ◽  
Author(s):  
Jian-Ping Suen ◽  
Edwin E. Herricks ◽  
J. Wayland Eheart ◽  
Fi-John Chang
Keyword(s):  
Reservoir Operation ◽  
Fish Communities

Dominance determines fish community biomass in a temperate seagrass ecosystem

2019 ◽  
Author(s):  
Aaron Matthius Eger ◽  
Rebecca J. Best ◽  
Julia Kathleen Baum
Keyword(s):  
Species Richness ◽  
Ecosystem Function ◽  
Fish Community ◽  
Prey Capture ◽  
Fish Communities ◽  
Functional Trait ◽  
Ecosystem Functions ◽  
Community Biomass ◽  
Ecosystem Valuation ◽  
Species Abundances

Biodiversity and ecosystem function are often correlated, but there are multiple hypotheses about the mechanisms underlying this relationship. Ecosystem functions such as primary or secondary production may be maximized by species richness, evenness in species abundances, or the presence or dominance of species with certain traits. Here, we combined surveys of natural fish communities (conducted in July and August, 2016) with morphological trait data to examine relationships between diversity and ecosystem function (quantified as fish community biomass) across 14 subtidal eelgrass meadows in the Northeast Pacific (54° N 130° W). We employed both taxonomic and functional trait measures of diversity to investigate if ecosystem function is driven by species diversity (complementarity hypothesis) or by the presence or dominance of species with particular trait values (selection or dominance hypotheses). After controlling for environmental variation, we found that fish community biomass is maximized when taxonomic richness and functional evenness is low, and in communities dominated by species with particular trait values – those associated with benthic habitats and prey capture. While previous work on fish communities has found that species richness is positively correlated with ecosystem function, our results instead highlight the capacity for regionally prevalent and locally dominant species to drive ecosystem function in moderately diverse communities. We discuss these alternate links between community composition and ecosystem function and consider their divergent implications for ecosystem valuation and conservation prioritization.

LBA-ECO LC-07 MONTHLY MEAN FLOODED WETLANDS HABITAT, CENTRAL AMAZON BASIN: 1979-1996

2011 ◽  
Author(s):  
B.R. FORSBERG, ◽  
M. GASTIL, ◽  
S.K. HAMILTON, ◽  
L.L. HESS, ◽  
I.B.T. LIMA, ◽  
...  
Keyword(s):  
Amazon Basin ◽  
Central Amazon

Linking eelgrass decline and impacts on associated fish communities to European green crab Carcinus maenas invasion

2016 ◽  
Vol 548 ◽  
pp. 31-45 ◽  
Author(s):  
K Matheson ◽  
CH McKenzie ◽  
RS Gregory ◽  
DA Robichaud ◽  
IR Bradbury ◽  
...  
Keyword(s):  
Carcinus Maenas ◽  
Fish Communities ◽  
Green Crab ◽  
European Green Crab

The Amazon. Basin of the river

2012 ◽  
Author(s):  
Tatiana Novichkova ◽  
Keyword(s):  
Amazon Basin
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