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Unformatted text preview: s participating individuals with food, shelter,
transport of gametes, or defense against predators.
* Not altruism (they are not helping each other in the sense that they are gaining something at the cost
of helping the other organism) - Mutualistic dependencies thought to have evolved in
many cases from anatagonistic interactions.
e.g. pollination may have evolved from insects feeding on
pollen. Examples of Mutualism
N-fixing bacteria and legumes
Bacteria in cow stomachs
Flowering plants and insects
Ants and Acacia trees
Ants and Treehoppers
Leafcutter ants and fungus
Yucca moth and Yucca
Cleaner fish & birds Final Note On Species Interactions
- Outcome of interactions depends on current conditions.
- Costs and benefits of species interactions are fluid.
- An interaction between the same two species may vary
from parasitism to mutualism to competition....
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