Outlines

Outline 8-1Community Structure and Species Diversity A.Ecologists use three characteristics to call a biological partnership. 1.Physical appearance: the relative sizes, stratification, and distribution of its populations and species a. drawn-out terrestrial communities ar patchy. b.Transition occurs around the run intos, where two alliance 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 liquidation ability. 2.Species diversity: a confederacy of bits of divergent species ( vastness) and abundance of individuals indoors each species (species evenness) 3. deferral structure: the number of ecological niches, their affinity 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 numbers pool per species). b.deuce major factors affect diversity of speci es 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 bracing species arrive, how fast old species become extinct, the size of the island, and the distance from the mainland. 1.

The species offset 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 posture: rate of immigration of species and rate of extinction of existing species. b.Two island features are important: size and distance fr om mainland. 2.This model has been expand t! o admit habitat islands in protected areas such as field of study 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 sooner evolved in a different ecosystem and migrated or were introduced to a new...If you need to get a full essay, order it on our website: OrderCustomPaper.com

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