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Essay / Research Paper Abstract
A 3 page morphological and ecological description of arrow worms. These organisms have evolved to have several advantages in their chosen habitats. They are important not just as predators but as a food source for higher organisms and as host species for various parasites. Bibliography lists 4 sources.
Page Count:
3 pages (~225 words per page)
File: AM2_PPwormsA.rtf
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Unformatted sample text from the term paper:
The characteristic arrow-shape (a shape largely attributed to the combination of a long narrow body bordered on each side by two sets of triangular fins and a rounded tail)
of the approximately 150 species that are encompassed within the Chaetognatha phylum has earned the arrow worms their common name (Thuesen, 2002). The worms are also unique in that
they are transparent and possess sickle-shaped spines on either side of their mouths that they use to grasp their prey (Thuesen, 2002). Found primarily in marine environments, arrow worms
typically float or swim through the water column as a part of the plankton that forms the basis of the oceans food source (Thuesen, 2002). Arrow worms can also
be found attached to algae or substrate but this is more uncommon (Thuesen, 2002). Thuesen (2002) reports that arrow worms are found all over the planet in:
"open ocean, tide pools, polar waters, marine caves, coastal lagoons, and the deep sea"
More advanced than most worms, arrow worms are carnivorous and consume other components of the plankton in which
they live (Thuesen, 2002). Copepods, small crustaceans, larval fish and even other chaetognaths are common food species (Thuesen, 2002). Arrow worms are frequently the second most prevalent species
of zooplankton and are often the most abundant animal present in the deep sea environment (Thuesen, 2002). In one study conducted in the shelf region of the northern Gulf
of Alaska they were found to be one of the most dominant macrozooplankton over a six year period of study (Broedeur and Terazaki, 1999). Broedeur and Terazaki (1999, 93)
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