scholarly journals AVALIAÇÃO DA INTEGRIDADE BIÓTICA DE RIACHOS A PARTIR DA ICTIOFAUNA

2021 ◽  
Vol 25 (02) ◽  
pp. 531-545
Author(s):  
Lilian Casatti ◽  
◽  
Camila Ortigossa
Keyword(s):  
Aquatic Ecosystems ◽  
Fish Assemblages ◽  
Scientific Production ◽  
Basic Knowledge ◽  
Biotic Integrity ◽  
Stream Fish ◽  
Fish Diversity ◽  
Stream Monitoring ◽  
Diverse World ◽  
Over Time

Almost four decades ago, ecologist James R. Karr published the first version of the Index of Biotic Integrity (IBI) to assess the health of aquatic ecosystems from fish assemblages. Since then, numerous adaptations, criticisms, and reinterpretations have emerged from this seminal study, covering diverse world biomes. In Brazil, the first versions of IBI for streams were developed in the South (in 2004). Over time, scientific production on this topic has shown a significant increase in the complexity of the approaches and methods used, mainly due to the advance in the basic knowledge about stream fish diversity, ecology, and biology. These studies include, for example, tests of metrics already proposed, proposals for new metrics, adaptations for different basins, and tests of the ecological responses of the ichthyofauna to different human-originated impacts. Even so, there are no standardized protocols for defining the metrics, nor for the introduction of these indexes in the stream monitoring routine. The objective of this article is to present a theoretical framework on the development of IBI for Brazilian streams, based on ichthyofauna, to discuss whether it is possible and feasible to standardize protocols for the development of IBIs and the prospects of applicability in Brazilian streams.

scholarly journals Comparing electrofishing and snorkelling for characterizing fish assemblages over time and space

2017 ◽  
Vol 74 (1) ◽  
pp. 75-86 ◽  
Author(s):  
Laura Plichard ◽  
Hervé Capra ◽  
Raphaël Mons ◽  
Hervé Pella ◽  
Nicolas Lamouroux
Keyword(s):  
Spatial Structure ◽  
Fish Assemblages ◽  
Species Abundance ◽  
Longitudinal Distribution ◽  
Stream Fish ◽  
Sampling Protocol ◽  
Environmental Processes ◽  
Stream Fish Assemblages ◽  
Over Time

Environmental processes and dispersal movements occurring over long distances (10 to 100 km) continually influence local stream fish assemblages. However, electrofishing protocols are classically implemented in short reaches (∼1 km) and are not suited for frequent characterization of assemblages over long distances. We developed a new sampling protocol (SPA: snorkelling point abundance) for characterizing fish assemblages over long distances, using series of sampling points, as often applied in electrofishing (PASE: point abundance samples by electrofishing). Nine pairs of PASE and SPA surveys, repeated in a narrow and in a wide stream, were compared. Greater species abundance, occurrence, and richness were found on PASE, but relative species abundance were comparable between protocols. Assemblages were highly variable over time (between-surveys) on both protocols. The spatial structure of point assemblages (within-survey) was consistent between protocols and related to species’ habitat use (depth, current velocity). For several species, the longitudinal distribution of abundance along reaches was comparable between protocols when surveys were pooled. Overall, SPA could be an alternative to electrofishing for analysing spatial structure over long distances.

scholarly journals Changes in ecosystem functions generated by fish populations after the introduction of a non-native predator (Cichla kelberi) (Perciformes: Cichlidae)

2021 ◽  
Vol 19 (3) ◽  
Author(s):  
Luiza Bangoim Leal ◽  
David J. Hoeinghaus ◽  
Zacchaeus G. Compson ◽  
Angelo A. Agostinho ◽  
Rodrigo Fernandes ◽  
...  
Keyword(s):  
Species Richness ◽  
Fish Assemblages ◽  
Null Model ◽  
Fish Populations ◽  
Ecosystem Functions ◽  
Fish Diversity ◽  
Total Biomass ◽  
Energy Mobilization ◽  
Before And After ◽  
Over Time

Abstract The introduction of non-native predators is a matter of great concern, but their impacts on ecosystem functions remain poorly understood. We investigated how changes in fish diversity following the invasion of Cichla kelberi affected ecosystem functions generated by fish populations. Fish assemblages were sampled in macrophyte patches in a Neotropical impoundment over a 5-year period, before and after the introduction of the predator. We assigned seven ecosystem functions (26 trait-states) to each fish species, and examined how these functions behaved after the invasion. We collected 577 fish belonging to 25 species. Species richness, fish biomass and main species declined significantly over periods. The biomass of ecosystem functions changed significantly over time, and most trait-states declined. Few trait-states were lost, but all functions had at least one trait-state reduced by more than 85%. A null model analysis showed that changes in functions were not driven by species identities, while species richness correlated positively with total biomass and with most functions, suggesting that the loss of taxa and biomass drove observed changes in ecosystem functions. Our study provided evidence that community disassembly associated with the invasion of C. kelberi translated to the decline of several ecosystem functions, affecting energy mobilization and transference.

scholarly journals Influence of environmental variables on stream fish fauna at multiple spatial scales

2016 ◽  
Vol 14 (3) ◽  
Author(s):  
Nara Tadini Junqueira ◽  
Diego Rodrigues Macedo ◽  
Rafael Couto Rosa de Souza ◽  
Robert Mason Hughes ◽  
Marcos Callisto ◽  
...  
Keyword(s):  
Land Use ◽  
River Basin ◽  
Fish Species ◽  
Environmental Variables ◽  
Fish Assemblages ◽  
Spatial Scales ◽  
Fish Fauna ◽  
Stream Fish ◽  
Fish Diversity ◽  
Physical Habitat

ABSTRACT Effects of environmental variables at different spatial scales on freshwater fish assemblages are relatively unexplored in Neotropical ecosystems. However, those influences are important for developing management strategies to conserve fish diversity and water resources. We evaluated the influences of site- (in-stream) and catchment-scale (land use and cover) environmental variables on the abundance and occurrence of fish species in streams of the Upper Araguari River basin through use of variance partitioning with partial CCA. We sampled 38 1st to 3rd order stream sites in September 2009. We quantified site variables to calculate 11 physical habitat metrics and mapped catchment land use/cover. Site and catchment variables explained > 50% of the total variation in fish species. Site variables (fish abundance: 25.31%; occurrence: 24.51%) explained slightly more variation in fish species than catchment land use/cover (abundance: 22.69%; occurrence: 18.90%), indicating that factors at both scales are important. Because anthropogenic pressures at site and catchment scales both affect stream fish in the Upper Araguari River basin, both must be considered jointly to apply conservation strategies in an efficient manner.

FISH DIVERSITY IN THE DOWNSTREAM REGION OF CIPANAS RIVER INDRAMAYU, WEST JAVA INDONESIA

Zoo Indonesia ◽  
2020 ◽  
Vol 29 (1) ◽  
Author(s):  
Titin Herawati ◽  
Gema Wahyudewantoro ◽  
Yuli Andriani ◽  
Heti Herawati ◽  
Naomi Masnida Yunisia Siregar
Keyword(s):  
Water Quality ◽  
Census Data ◽  
Fish Assemblages ◽  
Survey Methods ◽  
Upstream Region ◽  
Fish Diversity ◽  
West Java ◽  
Fish Collection ◽  
Java Sea ◽  
Downstream Area

Cipanas River is one river in West Java where its upstream region in Tampomas Mountain, Sumedang and it is emptied into the Java Sea, Indramayu. The study was aimed to investigate fish diversity in the downstream area of Cipanas River. The study was conducted by survey methods with census data collection techniques, taken place at 3 stations of Santing, Tempalong, and Cemara of Indramayu Regency. The parameters measured consisted water quality and fish assemblages. Water quality was measured referring to standard laboratory protocol, and fish collection was made by case net with different mesh sizes. The results showed that water quality conditions of the Cipanas River downstream was suitable for inhabiting fishes. There were as many as 548 individual fishes caught belonging to 21 species, 16 genera, and 14 families. Fish diversity was categorized as medium with 1.6 ≤ H ’≤ 2.2 indicating fairly good community structure, and the Evenness index was 0.81 ≤ E ≤ 0.86 to show highly evenly distributed.

scholarly journals Effect of environmental quality and mesohabitat structure on a Biotic Integrity Index based on fish assemblages of cerrado streams from Rio Cuiabá basin, Brazil

2011 ◽  
Vol 71 (3) ◽  
pp. 577-586 ◽  
Author(s):  
NG Machado ◽  
EM. Venticinque ◽  
J. Penha
Keyword(s):  
Environmental Quality ◽  
Fish Assemblages ◽  
Index Of Biotic Integrity ◽  
Biotic Integrity ◽  
Spearman Correlation ◽  
Aquatic Habitats ◽  
Integrity Index ◽  
Negative Impacts ◽  
Composition Structure ◽  
Biotic Integrity Index

Over the last 30 years, the Cerrado has been experiencing various antropic impacts that have brought about alterations to species composition, structure and functioning of aquatic habitats. Therefore, studies on negative impacts are useful to prevent future damage and restore environmental quality. The objectives of our study were: i) to adapt an index of biotic integrity of streams in the Rio Cuiabá Basin and ii) to analyze if the Index of Biotic Integrity (IBI) correlated with the environmental quality measured by the Index of Environmental Quality (IEQ) and with the mesohabitat structure. We sampled 26 streams in sub-basins of the Cuiabá River. In each stream, we closed a stretch of 50 m with blockage nets and used electrofishing to capture fish. To obtain a measure of environmental quality in sampled units, we characterized the stream and its micro basin. For the analyses, we used the Spearman Correlation, Kruskal-Wallis test and Analysis of Multiple Regression. We collected 697 individuals distributed into 6 orders, 15 families and 49 species. The IBI followed changes on environmental quality measured by IEQ when we removed streams that present natural barriers from the analysis (r² = 0.4; r² = 0.58). Types of land use did not affect the biotic integrity (n = 26; df = 4; H = 4,860; p = 0.302), but natural and artificial barriers affected it (n = 26; df = 4; H = 11,027; p = 0.026). The IBI was not sensitive to variations in mesohabitat structure (F2,23 = 0.373; r² = 0.031; Axe 1 p = 0.620; Axe 2 p = 0.490). The IBI is certainly a reasonable instrument for evaluating changes in the environment, but we cannot ignore the fact that we were able to obtain the same result with any combinations of metrics. This makes its analysis and interpretation difficult.

scholarly journals Land cover, riparian zones and instream habitat influence stream fish assemblages in the eastern Amazon

2018 ◽  
Vol 28 (2) ◽  
pp. 317-329 ◽  
Author(s):  
Luciano F. A. Montag ◽  
Kirk O. Winemiller ◽  
Friedrich W. Keppeler ◽  
Híngara Leão ◽  
Naraiana L. Benone ◽  
...  
Keyword(s):  
Land Cover ◽  
Fish Assemblages ◽  
Riparian Zones ◽  
Stream Fish ◽  
Stream Fish Assemblages
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