Plankton

Definition

Plankton are diverse collections of microscopic organisms that float or drift in water bodies. They play crucial roles in aquatic food webs and nutrient cycles.

5 Must Know Facts For Your Next Test

1. Plankton can be classified into phytoplankton (plant-like) and zooplankton (animal-like).
2. Phytoplankton perform photosynthesis and are primary producers in aquatic ecosystems.
3. Zooplankton include protozoa and small crustaceans, which feed on phytoplankton or other zooplankton.
4. Some planktonic organisms can cause harmful algal blooms, impacting water quality and marine life.
5. Certain unicellular eukaryotic parasites, like some types of dinoflagellates, exist as plankton during certain life stages.

Review Questions

Related terms

Phytoplankton:

Microscopic, plant-like organisms that perform photosynthesis in aquatic environments.

Zooplankton: Microscopic animal-like organisms that often feed on phytoplankton or smaller zooplankton.

Dinoflagellates: A group of single-celled eukaryotes that can be free-living or parasitic; some species cause red tides.