Patterns of Interaction Relationships between organisms in an

Patterns of Interaction Relationships between organisms in an ecosystem

Competition � Competition occurs when organisms compete for limited resources, such as food, water, light, or space. � Competition can occur between organisms of the same species (intraspecific) or organisms of different species (interspecific). � Examples: two trees compete for light within the forest (intraspecific); cheetahs and lions compete for similar prey (interspecific)

“Anemones Attack” �Video clip-2: 49 �http: //www. ck 12. org/lifescience/Competition-in-Life. Science/enrichment/Anemones. Attack/? referrer=concept_details

Predation �An organism, called a predator, feeds on another living organism, known as prey. �Predator-prey relationships are essential for healthy ecosystems. �Examples: a lion catches, kills, and eats a zebra; a praying mantis catches and eats a fly.

“Dragonfly Larva Hunts Newt” �Video clip-2: 06 �http: //www. ck 12. org/life-science/Predationin-Life-Science/enrichment/Dragonfly. Larva-Hunts. Newt/? referrer=concept_details

Mutualism �A symbiotic relationship in which both organisms benefit from the interaction. �Example: A clownfish provides protection from predators for the sea anemone, while the anemone's stinging tentacles protect the clownfish from predators.

Commensalism �A symbiotic relationship in which one species receives a benefit, while the other is unaffected. �Example: Cattle egrets live near livestock and eat the insects that are attracted to the animals, while the livestock is unaffected by the egrets.

Parasitism �A symbiotic relationship in which the parasitic species benefits, while the host species is harmed. �Example: A hookworm lives in the intestines and lungs of a host organism and causes them pain.

“Symbiosis: Mutualism, Commensalism, and Parasitism” �Video clip-5: 17 �http: //www. ck 12. org/life-science/Symbiosis -in-Life-Science/lecture/Symbiosis%3 AMutualism-Commensalsim-and. Parasitism/? referrer=concept_details

Bibliography � � � Harwood, J. , & Wilkin, D. , Ph. D. (n. d. ). Competition. Retrieved December 17, 2016, from http: //www. ck 12. org/life-science/Competition-in-Life. Science/lesson/Competition-MSLS/? referrer=concept_details Harwood, J. , & Wilkin, D. , Ph. D. (n. d. ). Predation. Retrieved December 17, 2016, from http: //www. ck 12. org/lifescience/Predation-in-Life-Science/lesson/Predation-MSLS/? referrer=concept_details Harwood, J. , & Wilkin, D. , Ph. D. (n. d. ). Symbiosis. Retrieved December 17, 2016, from http: //www. ck 12. org/life-science/Symbiosis-in-Life. Science/lesson/Symbiosis-MSLS/? referrer=concept_details