Interactions Types of Interactions OneWay Benefits Commensalism A

Interactions

Types of Interactions § One-Way Benefits § Commensalism § A situation where 2 different kinds of organisms live close together. § One organism benefits from this relationship. § The other organism is neither helped nor harmed.

Types of Interactions § Example of Commensalism § A robin lives in a tree. § The tree provides shelter and a place to build a nest. § The robin doesn’t help the tree, but it doesn’t harm the tree either.

Type of Interactions § Another example: § Adult barnacles attach themselves to horseshoe crabs. § The crabs allow the barnacles to travel. § The barnacles do not help or hurt the crabs.

Types of Interactions § Two-Way Benefits § Mutualism § A relationship in which both organisms benefit from each other.

Types of Interactions § Example of Mutualism § The bee and flowering plant § The bee gets nectar (liquid food) from the flower § The flower gets help in the pollination process as the bee gathers pollen as it feeds.

Type of Interactions § Another example of mutualism § Lichens § One organism that makes up a lichen is a fungus, which has many thread-like branches. § These branches provide both protection and moisture for the other organism. § The other organism is a single-celled organism called algae. § The algae make food through photosynthesis and the fungi get to use the food made by the algae.

Types of Interactions § Benefit & Harm § Parasitism § In parasitism, one organism lives in or on another organism. § One organism is harmed instead of helped and the other is helped.

Parasite vs. Host Parasite • The organism that lives on or in another organism. • Gets all of the benefits of the interaction. • • • Host The organism that a parasite lives in or on Is harmed instead of helped. Sometimes the host is even killed.

Types of Interactions § Examples of Parasitism § People and tapeworms § Trichinae (worms) and pigs § Rust fungus and wheat § Spruce trees and spruce budworms