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Small Rio Negro tributary near Manaus, Brazil
Brazil, Amazonas, Manaus
My simulated environment is the Negro River near Manaus. Manaus is located in the northwest of Brazil, on the left bank of the Negro River.
In the dry season the water level of this small tributary is very low. Under the scouring of the river, a large number of roots are exposed, and there are many dead leaves in the bottom. A large amount of humus colours the water yellow.
It’s a paradise for small fish, rich in food resources, and there are many shelters underwater, giving birth to many lives. There are abundant terrestrial plants here, with short trees, slender trunks and tree growth layers. Light-colored dry and hot deciduous bushes account for the largest proportion among these plants. Because of the acid water quality, there are basically no plants underwater.
- Submitted by
- Wang Qiliang
- Approved by
- Roberto E. Reis & Flávio Lima
- GPS
- -3.1220734, -60.0293579
- Geographical region
- South America
- Drainage Basin
- Rio Amazonas
- River catchment
- Rio Negro
- Water body type
- Wetland
- Water body name
- Rio Negro
- Water body part
- River mouth
- Water body course
- Lower course
- Water body: tributary of
- Rio
- Tributary name
- Negro
Videos above and below water
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Water Chemistry
Water information
- Water type
- fresh-water
- Water color
- Mixed water
- Water transparency
- Medium
- Concentration of sediments
- High
- Water temperature
- 25-28 °C
- Water flow/curent
- Slow
Chemical parameters
- pH
- 5
- Conductivity
- 50
- GH
- dGH
- KH
- dKH
- Dissolved Oxygen
- 45 %
Substrate in nature
- Sand
- Beige
- Pebble/Gravel
- None
- Stone
- None
- Stone form
- Silt/Mud
- Beige
- Leaves
- Many
- Driftwood
- Many
- Submerged terrestrial vegetation
- no
Aquatic Biotope
- Date of collecting
- Collecting area
- River bank
- Water depth
- 0,2m
- Air temperature
- Sunlight
- Partial shade
Environment
- Environment
- Affected by human activity
- Affected by human activity
- Pollution
- Pollution
- Advanced
- Surrounding area
The Rio Negro River, is the largest tributary of the North Bank of the Amazon River. Its source is the Orinoco River and the Amazon River watershed, it and Orinoco River between the Casiquiare river. The total length of the Negro River is 2550-2252.6km, the drainage area is 620000 square kilometers, the annual average flow is 30000m3/sec., the average annual runoff depth is 1600mm, and the suspended load concentration is 0.007kg/m3.
The largest tributary of the lower reaches of the Negro River is Rio Branco. The middle and lower tributaries include the Mucajai River, Ajarani River, Anaua River and Catrimani river. It flows into the Amazon River 17km below Manaus. It is about 2000km long. The river course twists and turns. There are many sandbanks in the lower reaches. The river is 30-50km wide, like a long lake and below Taprukuala is navigable. Through the Negro River and the Casiquiare River, the Amazon River and Orinoco River are connected with each other.
The basin is hot, rainy and sparsely populated. The marshes along the coast are humus. The rainy season starts in September and ends in May. The water temperature is about 26.5-28℃. The dry season starts around May and ends from August to September. The water level drops and the temperature rises, and the water temperature is about 28.5-30°C. Due to the low water level in the dry season, the pH value in the dry season is about 3.4. The water body in dry season is “black water”, while the water color in rainy season is light yellow.
- Underwater landscape
There are many dead leaves in the bottom bed of this tributary, and the increase of attachments makes the small fish have more food. Due to the existence of attachments, the bottom of the river is pale yellow. A large amount of humus darkens the color of water. The part near the river bank is much clearer, while the whole tributary is slightly turbid.
Fishes:
- Hemigrammus rubrostriatus
- Hemigrammus sp.
- Hyphessorbrycon sp.
- Threats to ecology
Manaus, as an important port of the Amazon River, is frequented by freighters, which also leads to a large number of fish moving their habitat to the depths of the jungle. Deep in the jungle, small fish can be seen everywhere, and abundant food resources give birth to many lives. It is also called the paradise for ornamental fish.
Riparian zone
- Trees near the aquatic habitat
-
Few -
