Trophic structure of macroinvertebrates in Amazonian streams impacted by anthropogenic siltation

Couceiro, Sheyla Regina Marques; Hamada, Neusa; Forsberg, Bruce R.; Padovesi-Fonseca, Claudia

doi:10.1111/j.1442-9993.2010.02198.x

Cited by 38 publications

(28 citation statements)

References 39 publications

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“…An area of 0.465 m 2 (1.50 m 9 0.31 m) was sampled in triplicate on the bottom of the stream for a distance of 1 m in the direction of the stream bank, until it reached the edge of the water at the bank (see Couceiro et al 2011). Individual samples were preserved in labeled plastic bags containing 90 % alcohol until analysis.…”

Section: Sampling and Proceduresmentioning

confidence: 99%

“…Also, because of their sessile habits, the ability for colonizing different types of substrates and their relatively long life term, this group of animals is widely used as water quality indicators (Kerans and Karr 1994;Couceiro et al 2011). As bioindicators, they respond to environmental changes in a variety of ways.…”

Section: Introductionmentioning

confidence: 99%

“…In the Brazilian lotic ecosystems, this classification has been widely used for measuring resources availability and their use by aquatic macroinvertebrates (Couceiro et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Environmental effects and urban impacts on aquatic macroinvertebrates in a stream of central Brazilian Cerrado

Salcedo

Padovesi-Fonseca

2015

Sustain. Water Resour. Manag.

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The urban effects on macroinvertebrate trophic structure were evaluated in a stream located in central Brazilian Cerrado. Samplings were evaluated from May/ 2004 to March/2005 in the upper, middle and lower sections. Characterization of ecological conditions and habitat diversity indicated headwater as ''natural'' site, up and downstream the urban region were ''altered'' ones, and the sites located nearest to urban area were considered ''impacted''. A well oxygenated and transparent water, acid pH, low electrical conductivity (\0.22 lS/cm), and low nutrients concentrations (\0.03 mg/L PO 4 -2 , \0.05 mg/L N-NH 4 and \3.0 mg/L N-NO 3 -2 ) was registered for headwater area. Stretches located near the urban region had higher electrical conductivity (48-100 lS/cm), higher ammonium (7.16 mg/L), and poor oxygenated water. The trophic organization was different along the stream and related to environmental preservation degree. Shredders occurred only in the headwater (Phylloicus sp., Trichoptera). Predators were dominant in upstream sites of the urban area ([90 % of biomass). In the sites located near the urban area, an alternative predominance was observed between gathering collectors and predators, with the gathering collectors dominance in the area impacted by city sewage inflow ([90 %). There was a progressive participation of scrapers in stretches located downstream of the city. Biomass was dominated by predators ([50 % in six sites) encompassing larger organisms ([20 mm), and gathering collectors were density dominants (from 53 to 99 %). Predators were the most dominant functional feeding group (22 taxa), followed by scrapers (eight), gathering collectors (seven) and filtering collectors (five). The results state that the Sobradinho stream is under different degrees of environmental impacts with lower preservation levels of its natural conditions, even in areas close to its headwater.

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Section: Sampling and Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Environmental effects and urban impacts on aquatic macroinvertebrates in a stream of central Brazilian Cerrado

Salcedo

Padovesi-Fonseca

2015

Sustain. Water Resour. Manag.

Self Cite

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“…Generally, taxonomic diversity decreases with disturbance (Stone & Wallace 1998). Higher sediment input due to erosion (Webster et al 1992) can decrease species richness, density or biomass (Larsen et al 2009;Couceiro et al 2011;Angradi 1999). However, changed environmental conditions due to deforestation such as increased insolation, primary productivity and altered thermal regimes (Swift, 1983) create habitats similar to downstream reaches and so enable colonization of several taxa from these reaches (Stone & Wallace 1998).…”

Section: Metricsmentioning

confidence: 99%

Caddisfly assemblages of high mountain streams (The High Tatra Mts, Slovakia) influenced by a major windstorm event

2013

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Hydrobiological research of high mountain streams in the High Tatras was carried out in [2009][2010]. We evaluated the influence of windstorm on caddisfly assemblages. To assess the influence of windstorm we focused on river morphology using the RHS method and evaluation of TAM, TOM and BOM (CPOM, FPOM, UFPOM) amount in seven streams. Site 1 was a control and the other six were disturbed by the windstorm in different ways. The most remarkable differences compared to the control site was in feeding structure at sites most affected by erosion. In these streams there was a noticeable dominance of predators from the family Rhyacophilidae (mainly Rhyacophila tristis; sites 3, 4, 5, 6) and a remarkable decrease of passive filter feeders (site 4, 5). Using Spearman coefficient we confirmed a positive correlation between the proportion of predators and amount of TAM caused by erosion of steep deforested slopes of windstorm affected sites. In contrast, we did not observe such an increase in the proportion of predators at site 7, which was affected by both windstorm and subsequently by fire. This might be explained by the shallow vee valley with no observed erosion, where this site is situated. We also found a negative correlation between predators and evenness, indicating unstable community structure clearing succesion in the streams disturbed by erosion, and a negative correlation between passive filter feeders and UFPOM. We found out that overhanging tree boughs and LWD had an influence on species composition. RHS was a useful tool in characterising the influence of hydromorphology on caddisfly assemblages.

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“…In the Brazilian Amazon, for example, sediments from mining tailings in streams and rivers may vary between one and two tonnes per gram of gold produced [13]. One of the major impacts of water siltation is the increase in light attenuation by suspended particles, which can directly affect phytoplankton productivity by limiting the availability of Photosynthetic Active Radiation (PAR), and indirectly contribute to changes in biodiversity within rivers, including plankton [10], macroinvertebrates [14], and fish [15]. Specific to the Amazon Basin, a major reduction in phytoplankton density has been documented in Batata Lake due to a gain in suspended matter caused by mining activity [16].…”

Section: Introductionmentioning

confidence: 99%

Effects of Small-Scale Gold Mining Tailings on the Underwater Light Field in the Tapajós River Basin, Brazilian Amazon

et al. 2017

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Artisanal and Small-scale Gold Mining (ASGM) within the Amazon region has created several environmental impacts, such as mercury contamination and changes in water quality due to increased siltation. This paper describes the effects of water siltation on the underwater light environment of rivers under different levels of gold mining activities in the Tapajós River Basin. Furthermore, it investigates possible impacts on the phytoplankton community. Two field campaigns were conducted in the Tapajós River Basin, during high water level and during low water level seasons, to measure Inherent and Apparent Optical Properties (IOPs, AOPs), including scattering (b) and absorption (a) coefficients and biogeochemical data (sediment content, pigments, and phytoplankton quantification). The biogeochemical data was separated into five classes according to the concentration of total suspended solids (TSS) ranging from 1.8 mg·L −1 to 113.6 mg·L −1 . The in-water light environment varied among those classes due to a wide range of concentrations of inorganic TSS originated from different levels of mining activities. For tributaries with low or no influence of mining tailings (TSS up to 6.8 mg·L −1 ), waters are relatively more absorbent with b:a ratio of 0.8 at 440 nm and b 660 magnitude of 2.1 m −1 . With increased TSS loadings from mining operations (TSS over 100 mg·L −1 ), the scattering process prevails over absorption (b:a ratio of 10.0 at 440 nm), and b 660 increases to 20.8 m −1 . Non-impacted tributaries presented a critical depth for phytoplankton productivity of up to 6.0 m with available light evenly distributed throughout the spectra. Whereas for greatly impacted waters, attenuation of light was faster, reducing the critical depth to about 1.7 m, with most of the available light comprising of red wavelengths. Overall, a dominance of diatoms was observed for the upstream rivers, whereas cyanobacteria prevailed in the low section of the Tapajós River. The results suggest that the spatial and temporal distribution of phytoplankton in the Tapajós River Basin is not only a function of light availability, but rather depends on the interplay of factors, including flood pulse, water velocity, nutrient availability, and seasonal variation of incoming irradiance. Ongoing research indicates that the effects of mining tailings on the aquatic environment, described here, are occurring in several rivers within the Amazon River Basin.

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Trophic structure of macroinvertebrates in Amazonian streams impacted by anthropogenic siltation

Cited by 38 publications

References 39 publications

Environmental effects and urban impacts on aquatic macroinvertebrates in a stream of central Brazilian Cerrado

Environmental effects and urban impacts on aquatic macroinvertebrates in a stream of central Brazilian Cerrado

Caddisfly assemblages of high mountain streams (The High Tatra Mts, Slovakia) influenced by a major windstorm event

Effects of Small-Scale Gold Mining Tailings on the Underwater Light Field in the Tapajós River Basin, Brazilian Amazon

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