Factors determining the structure of fish assemblages in an Amazonian river near to oil and gas exploration areas in the Amazon basin (Brazil): establishing the baseline for environmental evaluation

Costa, Igor David da; Freitas, Carlos Edwar de Carvalho

doi:10.1590/s1984-46702015000500004

Cited by 5 publications

(4 citation statements)

References 23 publications

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“…Understanding the main processes that affect the structure of fish communities remains an important challenge (Jackson et al, 2001;Costa, Freitas, 2015). In large river systems, fish diversity distributes heterogeneously across different spatiotemporal gradients, including longitudinal, lateral, altitudinal and seasonal dimensions (Humphries et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Seasonal and longitudinal variation in fish assemblage structure along an unregulated stretch of the Middle Uruguay River

et al. 2019

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Diversity patterns and their causes remain important questions, especially for ecosystems that preserve natural conditions. This is the case of fish diversity in large Neotropical rivers. In this context, we investigated fish diversity patterns along an extensive unregulated river section (ca. 450 km) in the Middle Uruguay River Basin. Sampling was conducted seasonally between May 2017 and March 2018, at six sites (patches) with contrasting environmental conditions. We collected 3,008 individuals belonging to 90 species. Nine were migratory, which summed relevant biomass in local assemblages (20 to 60%). We observed spatial variation in assemblage structure, but weak seasonal effects. Overall, biomass was similar among sites, but richness tended to increase downstream. Migratory fishes showed opposed trends, with higher richness and biomass upstream, particularly catfishes (Siluriformes). Ordination analyses separated sites in three groups based on variations in composition and abundance, and revealed associations between these groups and specific hydro-geomorphic conditions (i.e., flow, depth, channel width and the presence of riparian vegetation). Our study revealed that fish diversity distributes heterogeneously along the main channel, where hydro-geomorphic patches select for distinct assemblages along riverine gradients.

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Section: Introductionmentioning

confidence: 99%

Seasonal and longitudinal variation in fish assemblage structure along an unregulated stretch of the Middle Uruguay River

et al. 2019

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“…The physical and chemical factors of a reservoir determine the structure of its fish diversity and the structure in turn determines the diversity of species (Costa and Freitas, 2015). It was found that TG Halli reservoir is highly eutrophic.…”

Section: Discussionmentioning

confidence: 99%

Pattern of spatio-temporal fish diversity in association with habitat gradients in a tropical reservoir, India

Leela

Salim

Parakkandi

et al. 2021

Aquatic Ecosystem Health &Amp; Management

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Reservoirs are aquatic resources with the potential to increase India's fish production through inland fisheries. Thippagondanahalli is a medium-size reservoir on Arkavathy River, a tributary of the Cauvery. It is located in Bangalore rural district of Karnataka (12°58’24” to 12°96'49" N 77°20’33” to 77°35’63” E) and has a water surface area of 1162 ha at full reservoir level and 784.55 m at full supply level. Fish diversity studies were conducted to examine the spatial and temporal variations in fish diversity in relation to habitat parameters. A taxonomic abundance of 25 fish species (80% of them native) belonging to 14 families and 4 orders was recorded. A range of statistical estimators such as Chao 1, Jack 1, and Bootstrap were used to assess the expected species richness. The Jack 1 method showed the highest abundance with 28 species. The littoral zone, dominated by small indigenous species, was found to have relatively higher fish diversity (Shannon index-1.86) compared to the limnetic zone of the reservoir. Shannon diversity was higher in the monsoon season (1.76) compared to other seasons. Physico-chemical parameters revealed that this waterbody is highly eutrophic. Canonical correspondence analysis between seasonal habitat characteristics and seasonal species abundance showed the abundance of the small indigenous fish Amblypharyngodon mola during the post-monsoon season, the bottom feeder Cirrhinus mrigala and the surface feeder Rasbora daniconius during the monsoon season, and the carnivores Mystus malabaricus and Channa orientalis as well as the planktivore Puntius sarana during the pre-monsoon season. This study suggests the use of fisheries management and conservation measures such as fish-aggregating devices, stocking of certified seed, and impact assessment of exotic species.

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“…As bacias das regiões amazônicas abrigam um mosaico de diversas espécies de peixes de água doce do mundo, uma vez que sua região possui a maior floresta do mundo, bem como, um dos rios mais influentes para a biodiversidade da região. Por essa razão, acaba ganhando um importante destaque no cenário nacional e internacional (Brown-Peterson et al 2011;Rodrigues, 2013;Montenegro et al 2013;Costa & Freitas, 2015;Mereles, 2017).…”

Section: Introductionunclassified

Proporção Sexual E Relação Peso-Comprimento Do Geophagus Surinamensis (Bloch, 1791) Em Um Lago Amazônico / Sexual Proportion and Weight-Length Geophagus Surinamensis (Bloch, 1791) Amazon Lake

Sousa

Almeida

Funo

et al. 2020

BJD

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Factors determining the structure of fish assemblages in an Amazonian river near to oil and gas exploration areas in the Amazon basin (Brazil): establishing the baseline for environmental evaluation

Cited by 5 publications

References 23 publications

Seasonal and longitudinal variation in fish assemblage structure along an unregulated stretch of the Middle Uruguay River

Seasonal and longitudinal variation in fish assemblage structure along an unregulated stretch of the Middle Uruguay River

Pattern of spatio-temporal fish diversity in association with habitat gradients in a tropical reservoir, India

Proporção Sexual E Relação Peso-Comprimento Do Geophagus Surinamensis (Bloch, 1791) Em Um Lago Amazônico / Sexual Proportion and Weight-Length Geophagus Surinamensis (Bloch, 1791) Amazon Lake

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