~ Earthworm-ssection ~

Emily Sanchez ~ Vu PAP Bio ~ p.2

Objectives

In this investigation, the student will observe the external and internal structure of an earthworm.

Underground Information

Scientific name: Lumbricina

Habitat: moist soils where available.

Predators: Moles ,birds , some species of ants, millipedes and various other large insects.

Prey: anything that is dead; earthworms do not hunt.

Niche: earthworms make use of conditions that are best suited to their survival and create spaces in soil (soil dwelling)

Adaptations: streamlined body shape, setae (hairs on each segment in earthworms that help with grip), circular muscles, secreting mucus, sensing vibrations, staying deep in soil (as opposed to out in sunlight), aestivation (if habitat is not comfortable, the earthworm will "sleep it out" until it becomes bearable.)

Dissection

Big image
Big image
Big image

Digestive System

The digestive system consists of the pharynx, the esophagus, the crop, the intestine and the gizzard. Food enters the earthworm through the mouth and is swallowed by the pharynx. The food then passes through the esophagus, which also secretes calcium to get rid of excess calcium. After that, the food will eventually move to the gizzard, which grinds the food using stones that the worm ate. Then, the food moves into the intestine which releases fluids to aid the digestive process. Digested food is absorbed and transported where needed to the rest of the body, through the circulatory system.

This system cooperates with the endocrine system when glands in the earthworm secrete substances that control the process and aid the digestion.

Earthworms ❤ Humans

Earthworms are important in nature because they move through the soil, eating it and moving it. This is very helpful to farmers and gardeners because it keeps the soil in good condition and allows for better growing and crops.

Wormy Facts ~~~~~~

  • Most earthworms are scavengers that feed on dead organic matter
  • All earthworms are hermaphrodites (that is, a single individual can produce both male and female gametes, the eggs and sperm)
  • Most earthworms possess amazing powers of repairing body damage caused by predators or by accident (like getting split into pieces by birds)
  • The largest earthworm was found in South America and measured 22 feet long!
  • Earthworms are the basis of many food chains.
  • Earthworms breathe.......without lungs. They breathe through their skin.
  • In favorable conditions, worms breed every seven to ten days and can double their population in 90 days.

Sources

(Links were shortened, but will take you to the specific page.)

http://www.sciencelearn.org.nz- Niche and Habitat

http://www.sciencelearn.org.nz- Adaptations Page

http://www.sas.upenn.edu- information and diagram of digestive system.

http://australianmuseum.net.au

http://worms.a1sites.com

http://www.fcps.edu