Earthworm Migration Behaviour

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Essay #: 062783
Total text length is 10,185 characters (approximately 7.0 pages).

Excerpts from the Paper

The beginning:
Earthworm Migration Behaviour
Problem Statement
Earth worms (Lumbricus terrestris) are known to migrate to the surface. There is some question, however, regarding why they migrate to the surface. The prevalent opinion is that it is the result of changing light levels. Other researchers, though, suggest that the migration is related to moisture, temperature or organic material on the earth’s surface. The question is which of these factors actually stimulates earthworm migration behaviour.
Relevance of the Question
This question is relevant for a number of reasons. The most important, though, is that worms have a profound effect on the soil. Darwin himself noted the profound effect that worms have on soil composition. According to Darwin a...
The end:
.....er of worms observed on surface: 5
First worm seen: 10 minutes
All worms on surface: 47 min 15 seconds.
Did they stay long: no, collected material and left.
Appendix 6
Dark Tank with More Organic Material
Total number of worms observed on surface: 5
First worm seen: 9 min 42 seconds.
All worms on surface: 45 min and 7 seconds.
Did they stay long: no, collected material and left.
References
Deibert, E.J. and Utter, R.A. (2003, Jan/Feb), Earthworm
(
Lumbricidae
) survey of North Dakota fields placed in the
U.S. Conservation Reserve Program. Journal of Soil and
Water Conservation,58 (1): 39-46.
Harris,
C.Leon
(1992), Concepts in Zoology, Harper Collins
Publishing.
Stewart, Amy (2004, Winter), Darwin’s Worms, The Wilson
Quarterly,28 (1): 48-55.