Dwarf Wedge Diatom
Gomphonema pumilum
The Dwarf Wedge Diatom is a benthic diatom (Bacillariophyceae) primarily found in running waters and lakes, attached to hard substrates like stones or aquatic plants. It is characterized by its asymmetric, wedge-shaped appearance in girdle view and often forms short mucilaginous stalks for attachment. As a photoautotrophic organism, it performs photosynthesis and serves as a vital food source for aquatic invertebrates. The species is considered a sensitive indicator for water quality, particularly regarding nutrient enrichment.
Details
Oxygen production
Produces oxygen as a byproduct of photosynthesis directly in the water.
Habitat function
Component of the periphyton, providing habitat and food for microorganisms.
Nutrient uptake
Efficient uptake of nitrate and phosphate from the water.
Food source for
Food source for aquatic invertebrates (scrapers/grazers).
Human use
No direct economic use; scientific importance as a bioindicator.
Ecology
Ecological role
Primary producer; converts inorganic substances into organic biomass and produces oxygen.
Natural predators
Grazers such as snails (Gastropoda), mayfly larvae (Ephemeroptera), and various protozoa.
Competitor species
Other benthic diatoms such as Navicula or Nitzschia species.
Ecosystem service
Oxygen production and nutrient fixation in limnic ecosystems.
Threats
Eutrophication of water bodies, chemical pollution (herbicides), and heavy sedimentation.
Scientific profile
Protection & threats
Main threats
Excessive eutrophication (hypertrophication), toxic pollution from herbicides or heavy metals, and massive morphological alterations of water bodies that destroy stable substrates.