Boat-shaped diatom
Navicula
Navicula is a genus of diatoms distinguished by their characteristic boat-like shape. They feature a two-part silica shell known as a frustule with a longitudinal raphe, enabling them to move actively by gliding across surfaces. These algae are ubiquitous in aquatic environments globally, serving as a fundamental component of benthic ecosystems and vital primary producers.
Details
Oxygen production
Very high; diatoms are responsible for a significant portion of global atmospheric oxygen.
Habitat function
Formation of biofilms that serve as habitat and food source for microorganisms.
Nutrient uptake
Efficient uptake of dissolved silica, nitrate, and phosphate.
Food source for
Primary food source for benthic invertebrates such as mayfly larvae and snails.
Human use
Fossil deposits (diatomaceous earth) are used as filter aids, insulation, abrasives, and in forensics for drowning diagnosis (diatom test).
Ecology
Ecological role
Key primary producer, base of the aquatic food web, contributes to oxygen production and the global silica cycle.
Natural predators
Protozoa, rotifers, small crustaceans, and various insect larvae (grazers).
Competitor species
Other diatoms, green algae, and cyanobacteria within the periphyton.
Ecosystem service
Oxygen production via photosynthesis, carbon dioxide fixation, and water purification through nutrient uptake.
Threats
Water pollution, extreme eutrophication, and herbicide runoff.
Scientific profile
Protection & threats
Main threats
Input of herbicides (pesticides), extreme acidification of water bodies, and physical destruction of sediment habitats due to engineering.