Go to Section: 4–2What Shapes an Ecosystem? A.Biotic and Abiotic Factors B.The Niche C.Community Interactions 1.Competition 2.Predation 3.Symbiosis D.Ecological Succession 1.Primary Succession 2.Secondary Succession 3.Succession in a Marine Ecosystem Section 4-2 Section Outline

Go to Section: Biotic Factors ECOSYSTEM Abiotic Factors Section 4-2 Abiotic and Biotic Factors

Go to Section: Biotic Factors ECOSYSTEM Abiotic Factors Section 4-2 Abiotic and Biotic Factors

Go to Section: What is a Niche? videovideo Niche - the range of physical and biological conditions in which a species lives and the way the species obtains what it needs to survive.

Go to Section: Competition Results when organisms go after the same resource Competition results when niches overlap

Go to Section: Bay-Breasted Warbler Feeds in the middle part of the tree Yellow-Rumped Warbler Feeds in the lower part of the tree and at the bases of the middle branches Cape May Warbler Feeds at the tips of branches near the top of the tree Spruce tree Section 4-2 Figure 4-5 Three Species of Warblers and Their Niches Resource Division (partitioning)

Go to Section: Competitive exclusion- different species cannot occupy the same niche Fig Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings

Go to Section: Character displacement is the tendency for characteristics to diverge (become different) –Hereditary changes evolve that bring about using different resources Fig Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings

Go to Section: Symbiosis When different organisms live closely together

Go to Section: Commensalism One organisms benefits and the other has no effect

Go to Section: Mutualism Both organisms benefit

Go to Section: Parasitism One organisms benefits, the other is hurt