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    Question ID:   8416         Current Version: 1
Question: What are algae?
Category: Science > Botany
Keywords: algae, alga
Type: what
Rating:(0 ratings)    Views: 502    Discussions: 0   In Watch Lists: 1  

 
    Answer:
Algae are a natural and critical part of our ecosystems. Algae, like land plants, capture the sun's energy and support the food web that leads to fish and shellfish. They occur in a size range from tiny microscopic cells floating in the water column (phytoplankton) to large mats of visible "macroalgae" that grow on bottom sediments.

Algae may become harmful if they occur in an unnaturally high abundance or if they produce a toxin. A high abundance of algae can block sunlight to underwater grasses, consume oxygen in the water leading to fish kills, produce surface scum and odors, and interfere with the feeding of shellfish and other organisms that filter water to obtain their food. Some algal species can also produce chemicals that are toxic to humans and aquatic life.

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