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Igarapé Prosperitate, Rio Preto, Brazil

Brazil, Amazonas, Santa Isabel do Rio Negro

The igarapé Prosperitate is a tributary of the lower Rio Preto, a northern affluent of the Rio Negro, Brazil. The igarapé Prosperitate is a typical example of the countless small rain forest creeks of the Rio Negro region. The igarapé is located 12,5 km north-west off its junction with the Rio Negro.

Submitted by: Vern Van de Weyer
Approved by: Roberto Reis, Francesco Denitto & Donald C. Taphorn

GPS: -0.1630500, -64.1197205

Geographical region: South America
Drainage Basin: Rio Negro basin
River catchment: Rio Negro
Water body type: Igarapè
Water body name: Prosperitate
Water body part: River mouth
Water body course: Lower course
Water body: tributary of: Rio
Tributary name: Preto

Videos above and below water

Water Chemistry

Water information

Water type: Fresh water
Water color: Black water
Water transparency: Medium
Concentration of sediments: Low
Water temperature: 22-24 in the shade and up to 29.5°c in the sunny parts °C
Water flow/curent: Slow

Chemical parameters

pH: 5
Conductivity: 70
GH: 20 mg/l
KH
Dissolved Oxygen

Substrate in nature

Sand: Beige
Pebble/Gravel: None
Stone: None
Stone form
Silt/Mud: Brown
Leaves: Adundant
Driftwood: Many
Submerged terrestrial vegetation: No

Aquatic Biotope

Date of collecting: 1994
Collecting area: Small bay
Water depth: 1,0m
Air temperature
Sunlight: Full sun

Environment

Environment

Untouched

Surrounding area

The actual stream bed is flanked by broad belts of flood plains, and virtually the entire course is fully shaded by the surrounding vegetation, chiefly Ficus trees. Only the mouth, where during low water the final 30 meters of the forest stream broaden to form a lagoon some 5 meters in width, is exposed to sunlight. Upstream from its broad mouth, the creek splits into two branches. One falls dry during low water, only flowing during periods of normal or high water levels. The other branch maintains a width of 1.5 meters and a depth of 20 to 30 centimeters. The forest encompassing the igarapé Prosperitate consisted of various Ficus trees that measured about 8 meters in height. At the peak of the water height, they are submerged up to their crowns, up to about six meters.

Underwater landscape

During this period of low water the igarapé mouth measured a maximum depth of 1.2 meters, with no more than 40 cm of water above the layer of leaf litter. Temperatures reach a maximum of 29.5°C. Upstream the water temperature is approximately 24°C, because the complete stream is in shade. All sections of the stream have a substrate of leaf litter several decimeters thick. The upper third of the leaf litter is relatively loose and interspersed with a multitude of branches. The entire watercourse and adjacent areas were scattered with numerous tree stumps.

Fish: