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#11037 Mobile River basin, Alabama, USA

Sponsored by

United States, Alabama

The Mobile River basin supports exceptional freshwater biodiversity, providing habitat for a wide variety of fish, molluscs, and aquatic plants. Its conservation is particularly important, as it serves as an evolutionary refuge where complex biological interactions maintain the ecological balance of the region.

The basin is characterised by dynamic watercourses with waters ranging from crystal clear to lightly amber-coloured, depending on local conditions. Dense riparian vegetation contributes leaf litter and organic matter, supporting the natural functioning of the ecosystem. Suitable physicochemical conditions, seasonal temperatures, and high levels of dissolved oxygen create an ideal habitat for Notropis chrosomus.

This species is one of the basin’s most representative fishes, with a life cycle closely linked to the dynamics of flowing water. It offers an excellent opportunity to observe natural behaviour, including the striking colour changes displayed during the breeding season.

Submitted by
Sebastián Javier López
Geographical region
Northern America
Drainage Basin
Gulf of Mexico
River catchment
Rio Mobile
Water body type
River
Water body name
Mobile
Water body part
Outflow
Water body course
Lower course
Water body: tributary of
Tributary name

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Water Chemistry

Water information

Water type
Freshwater
Water color
Clear water
Water transparency
High
Concentration of sediments
No
Water temperature
16-24 °C
Water flow/curent
Strong

Chemical parameters

pH
6.0
Conductivity
GH
dGH
KH
dKH
Dissolved Oxygen

Substrate in nature

Sand
Beige
Pebble/Gravel
Mixed
Stone
Mixed
Stone form
Roundish
Silt/Mud
None
Leaves
Few
Driftwood
Few
Submerged terrestrial vegetation
None

Aquatic Biotope

Date of collecting
Collecting area
Water depth
Air temperature
Sunlight

Environment

Environment
Affected by human activity
Affected by human activity
Deforestation
Deforestation
Advanced
Surrounding area

The Mobile River basin is of great economic importance to Alabama, supporting commercial fisheries, navigation, and industry. The Port of Mobile is one of the busiest ports in the United States. Today, the basin also plays an important role in recreation, tourism, and other water-based activities.

Fish:

  • Notropis chrosomus (Leuciscidae)

Aquatic plants:

  • Vallisneria americana (Hydrocharitaceae)
  • Ceratophyllum demersum (Ceratophyllaceae)
Underwater landscape

The Mobile River basin is rich in biodiversity, supporting numerous species of fish, crayfish, mussels, and other aquatic organisms. It also contains several endemic species, meaning they are found nowhere else in the world, such as the Alabama sturgeon.

The rivers of this basin are essential for maintaining aquatic biodiversity and play a vital role in the conservation of many species and their habitats.

Threats to ecology

The construction of large hydroelectric dams and navigation systems has significantly altered the natural flow dynamics of the river. These modifications have transformed sections of fast-flowing rivers into slow-moving reservoirs, disrupting natural habitats and blocking fish migration routes.

Deforestation of riparian areas for agriculture and urban development has increased erosion, resulting in high levels of suspended sediments. This reduces water clarity, limiting photosynthesis in aquatic plants such as Vallisneria americana, and can also smother sensitive spawning areas.

As an important waterway for transportation and industry in the United States, the Mobile River basin is also affected by chemical discharges, heavy metals, and urban pollution from nearby cities. These pressures have a direct impact on the aquatic fauna, flora, and overall ecological balance of the ecosystem.