01:119:115 Lecture Notes - Lecture 25: Primary Succession, Commensalism, Ecological Succession
31 Jan 2017
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Lecture 25 - community ecology: community interactions. Community - association of populations that live & interact in same place at same time - Resource - anything from environment that meets needs of a particular species. Limiting resource - a resource in scarce supply. Ecological niche: sum of a species" use of biotic and abiotic resources = organism"s ecological role. How an organism uses materials in its environment. All physical, chemical, and biological factors a species needs. If an organism"s habitat is it"s address , the niche is the organism"s profession (eugene odum) Niche potentially occupied by that species - broad. Niche actually occupied by that species - more narrow resources actually used. Identical ecological niches competing: same limiting resources cannot coexist = competitive exclusion. Raised separately each population reached k. Grown together compete for same resources. Or they can divide up resources - resource partitioning by habitat, time of day/use.
