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Transcript of WORMS
-A successful parasite will live in a host and not kill it.
-It will produce a massive number of offspring to be passed off and infect others.
For example: A tapeworm lives inside a mammal for an extended period of time where it is replicating and expanding. It doesn't kill its host because it uses its host to pass its eggs out of the body to infect others. Like how ticks on cats and dogs suck blood and then leave when they are full, and/or how mosquitoes suck human blood then leave and reproduce rapidly.
Invertebrate Biology - Worms
Ecological Role of Platyhelminthes
Platyhelminthes are adapted to a wide range of environments, and many species are resistant to extreme environmental conditions. Some species occur:
Ecological Role of Nematodes
Nematodes have a simple tubular body form and are the most abundant multicellular animals on earth.
-Nematodes require water and food to be active, but soil pores may prevent them using some resources.
-They create excess nitrogen from their food in plant form.
-Nematodes activity may affect the plant community by its succession and composition.
Although some parasites can be defective, most nematodes are profitable, keeping the earth's nutrients cycling or increasing the diversity of natural ecosystems.
Ecological Role of Annelids
-Some annelids are parasitic such as leeches
-Annelids are known for reworking the soil and sediments
Six types of non-segmented worms are known to infect people, they are usually known by the animals they live in. Ex: Taenia saginata from beef, Taenia solium from pork, and Diphyllobothrium latum from fish. It is also possible to contract pork tapeworms from foods prepared by an infected person. Tapeworm eggs are passed with bowel movements so if a person who doesn't wash hands well after wiping and then prepares food, they can contaminate it and infect other people .
Types of Diseases
- Obstruction of pulmonary arteries due to emboli from dying worms is more likely to be fatal in cats than dogs because of less collateral circulation and fewer vessels.
Trichinosis - is a parasitic disease caused by eating raw or undercooked pork or wild game infected with the larvae of a species of roundworm Trichinella spiralis, commonly called the trichina worm.
By: Emma Lee-Young
- in soil
-pools in the desert
- in caves.
Many platyhelminthes live in association with plants and animals. Marine algae, for example, often harbour many turbellarian species, which are usually in large numbers. Turbellarians most commonly associate with animals such as echinoderms (sea stars), crustaceans (crabs), and mollusks.
-They are mostly found in wet environments like oceanic waters, damp soil or fresh water.
-Reproduce through internal fertilization
-In terrestrial annelids (earthworms) the eggs are deposited into the ground.
-In aquatic annelids (leech) the eggs are deposited into the water.
-They play in important role in turning over sediment on ocean floors