Occurrence of aquatic macroinvertebrates in an extrativist reserve of brazilian Amazon

Freshwater invertebrates occupy important roles in ecological processes and are frequently used as indicators of water quality. Their existence, however, is still obscure in many regions of the country, i.e. very few relevant studies have been conducted regarding their presence especially in the Amazon region. Thus, this study aimed to present an inventory of aquatic macroinvertebrates from the marginal region of an Amazonian lake. This study was conducted in a floodplain area, at the Extractivist Reserve of Cuniã Lake (margin of the Madeira River).To sample macrofauna, were collected sediment and aquatic macrophytes near the marginal region in seven sites during low-water season (August 2015) and the high-water season (February 2016). The environmental variables (water temperature (ºC), electric conductivity (μS /cm), pH, and dissolved oxygen (mg/L) were measured at each site and concentrations of organic matter in the sediment were also determined. A total of 28 taxa were recorded. The most significant taxa for the lake were the genera: Campsurus (Ephemeroptera: Polymitarcydae) and Tenagobia (Hemiptera: Corixidae. The lake presents diverse macrofauna, indicating good environmental quality and organic enrichment, which highlights the importance of flood in composition of local macrofauna.

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Age, Religion, and Taboos Influence Subsistence Hunting by Indigenous People of the Lower Madeira River, Brazilian Amazon

Journal of Ethnobiology ◽

10.2993/0278-0771-40.2.131 ◽

2020 ◽

Vol 40 (2) ◽

pp. 131

Author(s):

Simon B. Knoop ◽

Thais Q. Morcatty ◽

Hani R. El Bizri ◽

Susan M. Cheyne

Keyword(s):

Indigenous People ◽

Brazilian Amazon ◽

Subsistence Hunting ◽

Madeira River

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Structure, Diversity, and Environmental Determinants of High-Latitude Threatened Conifer Forests

Forests ◽

10.3390/f12060775 ◽

2021 ◽

Vol 12 (6) ◽

pp. 775

Author(s):

Carlos Esse ◽

Francisco Correa-Araneda ◽

Cristian Acuña ◽

Rodrigo Santander-Massa ◽

Patricio De Los Ríos-Escalante ◽

...

Keyword(s):

Water Table ◽

Environmental Variables ◽

National Park ◽

High Water ◽

Forest Communities ◽

Competitive Effect ◽

Forest Patches ◽

Last Glaciation ◽

The World ◽

Local Topography

Pilgerodendron uviferum (D. Don) Florin is an endemic, threatened conifer that grows in South America. In the sub-Antarctic territory, one of the most isolated places in the world, some forest patches remain untouched since the last glaciation. In this study, we analyze the tree structure and tree diversity and characterize the environmental conditions where P. uviferum-dominated stands develop within the Magellanic islands in Kawésqar National Park, Chile. An environmental matrix using the databases WorldClim and SoilGrids and local topography variables was used to identify the main environmental variables that explain the P. uviferum-dominated stands. PCA was used to reduce the environmental variables, and PERMANOVA and nMDS were used to evaluate differences among forest communities. The results show that two forest communities are present within the Magellanic islands. Both forest communities share the fact that they can persist over time due to the high water table that limits the competitive effect from other tree species less tolerant to high soil water table and organic matter. Our results contribute to knowledge of the species’ environmental preference and design conservation programs.

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Assessment of mental suffering in a population affected by the Madeira River flood in the Brazilian Amazon

International Journal of Advanced Engineering Research and Science ◽

10.22161/ijaers.72.22 ◽

2020 ◽

Vol 7 (2) ◽

pp. 155-165

Author(s):

Carlos Alberto Paraguassu-Chaves ◽

Allan Kardec Duailibe Barros Filho ◽

Carlos Tomaz ◽

Maria Clotilde H Tavares ◽

Lenita Rodrigues Moreira Dantas ◽

...

Keyword(s):

Brazilian Amazon ◽

River Flood ◽

Madeira River

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A new species of Coccoloba P. Browne (Polygonaceae) from the Brazilian Amazon with exceptionally large leaves

Acta Amazonica ◽

10.1590/1809-4392201804771 ◽

2019 ◽

Vol 49 (4) ◽

pp. 324-329 ◽

Cited By ~ 1

Author(s):

Efigenia de MELO ◽

Carlos Alberto CID FERREIRA ◽

Rogério GRIBEL

Keyword(s):

New Species ◽

Conservation Status ◽

Natural Habitat ◽

Morphological Characteristics ◽

Brazilian Amazon ◽

Cultivated Plants ◽

New Taxon ◽

Madeira River ◽

Individual Trees ◽

A New Species

ABSTRACT We describe and illustrate a new species of Coccoloba (Polygonaceae), named Coccoloba gigantifolia, from the Brazilian Amazon. It resembles Coccoloba mollis Casar, but differs from the latter species by its much larger leaves in the fertile branches. The species has only been recorded in the Madeira River basin, in the states of Amazonas and Rondônia, in the central and southwestern Brazilian Amazon. The description was based on herbarium material, cultivated plants, and individual trees in their natural habitat. We provide illustrations, photographs, and an identification key with morphological characteristics that distinguish the new taxon from the other two related taxa of the Coccoloba sect. Paniculatae, as well as comments on the geographic distribution and conservation status of the species.

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An assessment of the factors determining rotifer assemblage in river-lake systems: the effects of seasonality and habitat

Zoologia (Curitiba) ◽

10.3897/zoologia.36.e24191 ◽

2019 ◽

Vol 36 ◽

pp. 1-5

Author(s):

Moacyr Serafim-Júnior ◽

Gilmar Perbiche-Neves ◽

Fabio Lansac-Toha

Keyword(s):

Species Richness ◽

Aquatic Macrophytes ◽

Hydrological Cycle ◽

High Water ◽

Water Levels ◽

Natural Environments ◽

Ecological Attributes ◽

Lake System ◽

The Mean ◽

Lake Systems

Zooplankton exhibit several trends of variation in space and time, and these trends can be more evident in natural environments without anthropic perturbations. Examples of anthropic factors are climate change, eutrophication and construction of reservoirs. This study evaluated the influence of three factors – seasonality, type of environment and the presence of aquatic macrophytes – on various ecological attributes of rotifers in a river-lake system located in the Paraná River floodplain. Monthly samplings were conducted during 1993 and 1994. The mean species richness per sample was 60 species. The seasonality and the type of environment influenced the ecological attributes of rotifer assemblages, while the presence or absence of aquatic macrophytes did not. Species richness was highest in the lake system and during the months when water levels were low. Multivariate analysis indicates a small group of species associated with the low water-level phase. In contrast, many species were associated with high water levels or increasing water levels. The seasonal variation of hydrological cycle and the type of environment are the most important factors for rotifer structure in natural conditions.

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Assessing macroinvertebrate communities in relation to environmental variables: the case of Sambandou wetlands, Vhembe Biosphere Reserve

Applied Water Science ◽

10.1007/s13201-019-1103-9 ◽

2019 ◽

Vol 10 (1) ◽

Cited By ~ 3

Author(s):

Tatenda Dalu ◽

Rivoningo Chauke

Keyword(s):

Community Structure ◽

Water Depth ◽

Environmental Variables ◽

Anthropogenic Activities ◽

Biosphere Reserve ◽

High Water ◽

Macroinvertebrate Community ◽

Macroinvertebrate Communities ◽

Negative Effect ◽

Macrophyte Cover

AbstractThe Vhembe Biosphere Reserve, South Africa, contains many wetlands that serve as wildlife habitats and provide vital ecosystem services. Some of the wetlands are continuously being degraded or destroyed by anthropogenic activities causing them to disappear at an alarming rate. Benthic macroinvertebrates are known as good water quality bioindicators and are used to assess aquatic ecosystem health. The current study investigated habitat quality using macroinvertebrate community structure and other biotic variables (i.e. phytoplankton, macrophytes) in relation to environmental variables in the Sambandou wetlands using canonical correspondence analysis (CCA). A total of fifteen macroinvertebrate families were identified over two seasons. The CCA highlighted seven variables, i.e. pH, phosphate concentration, temperature, ammonium, macrophyte cover, conductivity and water depth, which were significant in structuring macroinvertebrate community. Picophytoplankton and microphytoplankton concentrations decreased from winter to summer, whereas nanophytoplankton concentration increased from winter to summer. Thus, the dominance of small-sized phytoplankton indicated nutrient limitation and decreased productivity, whereas winter sites 2 and 3 were dominated by large-celled phytoplankton, highlighting increased productivity. Winter sites were mostly negatively associated with CCA axis 1 and were characterised by high temperature, phosphate and ammonium concentrations, macrophyte cover, pH and conductivity. Summer sites were positively associated with axis 1, being characterised by high water depth and pH levels. The results obtained highlighted that agricultural activities such as cattle grazing and crop farming and sand mining/poaching had a negative effect on macroinvertebrate community structure.

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Length–weight relationships for six fish species found in a floodplain lake of the Madeira River, Brazilian Amazon

Journal of Applied Ichthyology ◽

10.1111/jai.14083 ◽

2020 ◽

Vol 36 (6) ◽

pp. 842-844

Author(s):

Severino Adriano de Oliveira Lima ◽

Raniere Garcez Costa Sousa

Keyword(s):

Fish Species ◽

Brazilian Amazon ◽

Floodplain Lake ◽

Madeira River

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Spawning of migratory fish species between two reservoirs of the upper Uruguay River, Brazil

Neotropical Ichthyology ◽

10.1590/s1679-62252012000400016 ◽

2012 ◽

Vol 10 (4) ◽

pp. 829-835 ◽

Cited By ~ 22

Author(s):

David A. Reynalte-Tataje ◽

Alex P. O. Nuñer ◽

Michele C. Nunes ◽

Valquíria Garcia ◽

Carolina A. Lopes ◽

...

Keyword(s):

Environmental Variables ◽

Water Surface ◽

High Water ◽

Migratory Fish ◽

Migratory Species ◽

Prochilodus Lineatus ◽

Main River ◽

Fish Spawning ◽

Uruguay River ◽

Salminus Brasiliensis

This study investigated the migratory fish spawning within the reservoirs of the Machadinho and Itá dams (upper Uruguay River, Brazil) and its relationship to environmental variables. Sampling was conducted in the lotic region of the river in two sites between the dams' reservoirs: Uruguay (main river) and Ligeiro (tributary). Sampling included nine consecutive reproductive periods (RP) spanning the period from 2001 to 2010 and was conducted at night on the water surface using cylindrical-conical plankton nets (0.5 mm mesh); environmental variables were also recorded. The spawning of the migratory species Salminus brasiliensis, Prochilodus lineatus, and Steindachneridion scriptum was registered: S. brasiliensis and P. lineatus spawned in the tributary river at the end of spring/beginning of summer, during flooding and during periods of high water temperature. Steindachneridion scriptum spawned in the main river at the beginning of spring. The study showed that S. brasiliensis, P. lineatus, and S. scriptum are able to spawn in small lotic river stretches within two reservoirs, but only under very specific and not common environmental conditions.

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