Outlines

Outline 8-1Community Structure and Species Diversity A.Ecologists use common chord characteristics to describe a biologic partnership. 1.Physical appearance: the relative sizes, stratification, and scattering of its populations and species a. extended wandering communities ar patchy. b.Transition occurs around the edges, where two corporation types interact. c.Increased edge area whitethorn be bruising payable to habitat fragmentation; galore(postnominal) species construct more vulnerable to predators and detriment of colonization ability. 2.Species form: a confederacy of bits of distinct species ( vastness) and abundance of individuals within sepa come outly species (species evenness) 3. delay structure: the number of bionomical niches, their resemblance or put out from each other, and interaction of species with each other a.High species richness much is tally with low species evenness (few verse per species). b.deuce major factors affect diversity of species in a conjunction of interests: parallel in terrestrial communities and pollution in aquatic systems. B.The number of species on an island is find out by how immobile impertinently species arrive, how fast old species belong extinct, the size of the island, and the exceed from the mainland. 1.

The species residual poser, or the theory of island biogeography, was proposed in the 1960s to explain differences in species richness with island size. a.Balance between two factors is important in this influence: rate of immigration of species and rate of extinction of existing species. b.Two island features are important: size and distance from mainland. 2.This model has been expand to overwhelm habitat islands in defend areas such as field of study parks. 8-2Types of Species Species in a community play many assorted roles in its ecology. A.Types of Species 1.Native species are those whose real domicil is in this particular ecosystem. 2.Nonnative species primarily evolved in a different ecosystem and migrated or were introduced to a new...If you postulate to get a bountiful essay, order it on our website: Orderessay

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