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The Ocean: A Traveler’s Guide

The Ocean: A Traveler’s Guide. Zoology. Marine animals are divided into three groups: zooplankton, nekton, and benthos. Zooplankton.

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The Ocean: A Traveler’s Guide

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  1. The Ocean: A Traveler’s Guide Zoology

  2. Marine animals are divided into three groups: zooplankton, nekton, and benthos.

  3. Zooplankton • Zooplanktons are drifting animals and are usually small; however, they can grow to fairly large size. (i.e. the jellyfish/Portuguese man-of-war are larger types of zooplankton which are unable to propel themselves effectively. They are at the mercy of either wind or current.) • The zooplankton population has some temporary members too ( i.e. fish eggs or larval forms of organisms which may grow up and leave the planktonic community to join the nekton or benthos.)

  4. Nekton • Nektons are the free swimmers. • The largest portion of familiar animals found in the ocean belong to this class (i.e. common fishes, the octopus, whales, eels, squid) • It is very diverse, containing eberything from dolphins to whales to squid.

  5. Benthos • Benthos spends its entire life on or in the ocean bottom. • This group includes lobsters, starfish, various worms, snails, oysters, etc. • Some (like lobsters, snails, etc.) may be able to move about on the bottom but their lifestyle is so bound up with the ocean floor that they are unable to survive away from this environment.

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