Outlines

Outline 8-1Community Structure and Species Diversity A.Ecologists use three characteristics to puff a biological partnership. 1.Physical appearance: the relative sizes, stratification, and distribution of its populations and species a. extend terrestrial communities be patchy. b.Transition occurs around the surrounds, where two alliance types interact. c.Increased edge area may be bruising due to habitat fragmentation; galore(postnominal) species become more vulnerable to predators and loss of small town ability. 2.Species diversity: a confederacy of bits of different species ( vastness) and abundance of individuals inwardly each species (species evenness) 3. deferral structure: the number of ecological niches, their resemblance or release from each other, and interaction of species with each other a.High species richness much is correlated with low species evenness (few numbers racket per species). b.deuce major factors affect diversity 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 untested species arrive, how fast old species become extinct, the size of the island, and the distance from the mainland. 1.The species sense of balance 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 manikin: 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 allow habitat islands in protected areas such as subject 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 to begin with evolved in a diffe rent ecosystem and migrated or were introduc! ed to a new...If you take to get a full essay, order it on our website: BestEssayCheap.com

If you want to get a full essay, visit our page: cheap essay