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Symbiotic Relationships

posted Nov 20, 2012, 7:56 AM by castonmullen@yahoo.com   [ updated Nov 27, 2012, 7:54 AM ]
Mutual Relationships with plants- A large number of grizzlies have a mutual relationship with berry producing plants.  Many bears feed on berries found in the forest they inhabit. These plants that produce the berries are benefited by the bear's eating of them because this effectively spreads their seeds. By ingesting the seeds then moving to a new location, the bear drops the seeds in the form of waste in  a new location that may foster the growth of the plant in a new area.
Parasitic lice- A portion of the bear population has contracted lice. These lice feed off of the grizzly bears by sucking blood. This harms the bear while benefiting the lice. This is indicative of a parasitic relationship.
Keystone species- A keystone species is a specific animal that an entire habitat/ecosystem depends on for survival. in the grizzly bear's habitat the grizzly is the keystone species. The Grizzly bear transports nutrients from the ocean brought part of the way by salmon to the forest ecosystem in which the live for a majority of the year and also by leaving their carcasses on land the surrounding area receives more nutrients than they normally would. Up to half of the salmon bears harvest end up on the forest floor, thus providing much needed nutrients for them. If the grizzly were to become extinct or migrated out of its habitat the salmon that normally provide nutrients for the forest ecosystem would instead be halted at the edge of the river. They would never make it to the forest floor and thus the forest could be endanger of dying and a large portion of the vegetation could die resulting in major loss of life at the primary consumer and upwards on the food chain.
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