from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Plankton that remains free-swimming through all stages of its life cycle.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any organism that spends all of its life-cycle as plankton
from The Century Dictionary and Cyclopedia
- n. The plants and animals that pass their whole life swimming or floating in the water, considered collectively and in contrast with those that float or swim for only a part of their lives, passing the rest upon or in the bottom. See hemibenthic, holebenthic, hemiplankton, holoplanktonic, planktonic.
Within the plankton, holoplankton are those that spend their entire life cycle in the plankton, while meroplankton are those organisms that are only planktonic for part of their lives (usually the larval stage), and then move into the nekton or a benthic habitat.
Post-transport ballast water contains high densities of both holoplankton, organisms such as dinoflagellates and jellyfish that spend their entire life as plankton, and meroplankton, the temporary larval stages of crustaceans, worms, and fish.
Post-transport ballast water contains high densities of both holoplankton, organisms such as dinoflagellates and jellyfish that spend their entire life as Figure 2b.