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Direct Animal Interactions

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Organisms in our society are always interacting with one another on a daily basis. These interactions impact the fate of the organisms lives, and that of the rest of the ecosystem. These interactions can either be direct and indirect. A direct organism affects an organism without outside interferences, while an indirect organism interaction is when an organism interacts an organism by its effects on a third organism. The three different direct interactions are competition in which both organisms interacting or negatively effect, mutualism in which both organisms benefit from the direct interactions, and predation in which one organism benefits from the interaction while the other one does not. Trophic cascades are found in ecological communities and directly impact the interactions of the marine intertidal species Hemigrapsus sanguineus (invasive crab), Littorina littorea (snail), Fucus distichus …show more content…

will be examined. The Ulva would be expected to dominate over the Fucus distichus because the Ulva is the superior space competitor. The Ulva grows and populates much faster, so would be able to take over an area with no animals around. In an area with large herbivorous snails you would expect the Fucus distichus to dominate because snails typically eat Ulva, allowing the Fucus distichus to dominate because they have a chemical protection. In an area with a large crab population, you would expect the Ulva sp. to dominate because the Asian shore crabs eat periwinkle snails, resulting in more Ulva sp. because there won’t be enough snails to eat them. If there is a presence of Asian shore crabs, the Ulva sp. will dominate in a community over the Fucus distichus the Asian shore crab will eat the periwinkle snail and allow for the ulva to prosper without the fear of a predator and dominate space over the Fucus

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