Simocephalus mixtus

Sars, 1903

Simocephalus mixtus is a cladoceran crustacean in the Daphniidae, first described by Sars in 1903. It is a filter-feeder found in tropical and sub-tropical aquatic systems, capable of consuming both green and cyanobacteria. The exhibits temperature-dependent feeding , with measurable variation in filtration rates across 20–30°C. Its ability to consume Microcystis, albeit at lower rates than preferred algal foods, suggests potential utility in biomanipulation of cyanobacterial blooms.

Simocephalus mixtus by (c) Joseph McPhail, some rights reserved (CC BY), uploaded by Joseph McPhail. Used under a CC-BY license.

Pronunciation

How to pronounce Simocephalus mixtus: //ˌsɪmoʊˈsɛfələs ˈmɪkstəs//

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Habitat

Tropical and sub-tropical aquatic systems, including wetlands.

Distribution

Afrotropical, Nearctic, Neotropical, Oriental (Indomalaya), and Palearctic regions based on GBIF records.

Diet

filter-feeder; consumes Chlorella vulgaris (green ) and Microcystis sp. (cyanobacteria), with significantly lower ingestion rates on Microcystis compared to C. vulgaris.

Behavior

Feeding and filtration rates vary with temperature (20, 25, 30°C) and food concentration (0.2–2.0 × 10⁶ mL⁻¹).

Ecological Role

Potential agent for top-down biomanipulation of cyanobacterial blooms in tropical and sub-tropical aquatic systems, contingent on control of fish pressure.

Human Relevance

Proposed for use in managing cyanobacterial blooms through biomanipulation, though large- application requires further investigation.

Sources and further reading