BISC 204 Lecture Notes - Lecture 10: Ecological Niche, Limiting Factor, Intraspecific Competition
13 Nov 2017
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Things that stabilize predator-prey interactions: predator inefficiency, density-dependence of predators or prey, alternative food sources for predators, refuges for prey. Use of a resource by one individual that reduces it availability to other individuals: classify based on species involved: Intraspecific competition - within speces (eg logistic growth: classify based on the nature of the interaction: Resource competition - when organisms use common resources that are in short supply examples: desert rodents & ants (book) Bisc 204: renewable versus non renewable resources. Nonrenewable eg. space: once occupied, it is not replenished until the organism renewable eg, nutrients, food, etc leaves, continuously replenished (but at varying rates) Indirect regeneration herbivores herbivores herbivores hares hares hares grasses grasses grasses: competitive exclusion principle gause (1932) 2 species cannot co-exist indefinitely on the same limiting resource. Or co-exist in the same niche nutrients nutrients nutrients. Elton (1927): place in the biotic environment, its role in the community.
