Lecture 16- Niches

Lecture 16- Niches - Lecture 16- Niches Niche- a species...

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Lecture 16- Niches Niche- a species’ place in nature; a role taken by a type of organism within its community Bluegill, Lepomis machrochirus - When prey density is low, bluegills eat equal proportions of prey sizes; when prey density is high, bluegills eat proportionally more large prey than medium or small prey. What it eats depends on what is available and the abundance Fundamental Niche - The range of conditions and resources that a species can possible tolerate and use Realized Niche - The range of conditions and resources that a species actually uses in nature Realized niches are smaller than fundamental niches for various reasons: competition, availability, etc Population Interactions and Their Effects Predation +/- Predators gain nutrients and energy; prey are killed or injured Herbivory +/- Herbivores gain nutrients and energy; plants are killed or injured Competition -/- Both competing populations lose access to some resources Commensalism +/0 One population benefits; the other population is unaffected Mutualism +/+ Both populations benefit Parasitism +/- Parasites gain nutrients and energy; hosts are injured and killed Coevolution- the genetically based, reciprocal adaptations in two or more interacting species
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Lecture 16- Niches - Lecture 16- Niches Niche- a species...

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