Outlines

Outline 8-1Community Structure and Species Diversity A.Ecologists use three characteristics to pull back a biological partnership. 1.Physical appearance: the relative sizes, stratification, and distribution of its populations and species a. prolonged terrestrial communities are patchy. b.Transition occurs around the go ons, where two society types interact. c.Increased edge area may be bruising due to home ground fragmentation; galore(postnominal) species become more vulnerable to predators and loss of colonization ability. 2.Species diversity: a confederacy of bits of opposite species ( vastness) and abundance of individuals deep down each species (species evenness) 3. deferral structure: the number of ecological niches, their semblance or release from each former(a), and interaction of species with each other a.High species richness much is correlated with low species evenness (few metrical composition per species). b.deuce major factors affect diver sity of species in a community: parallel in terrestrial communities and pollution in aquatic systems. B.The number of species on an island is determined by how immobile sore species arrive, how fast old species become extinct, the size of the island, and the distance from the mainland. 1.

The species proportion 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 shape: 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 mo! del has been expand to hold habitat islands in protected areas such as internal parks. 8-2Types of Species Species in a community play many different roles in its ecology. A.Types of Species 1.Native species are those whose original domicil is in this particular ecosystem. 2.Nonnative species originally evolved in a different ecosystem and migrated or were introduced to a new...If you command to get a full essay, order it on our website: BestEssayCheap.com

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