Outlines

Outline 8-1Community Structure and Species Diversity A.Ecologists use three characteristics to bring up a biological partnership. 1.Physical appearance: the relative sizes, stratification, and distribution of its populations and species a. encompassing terrestrial communities argon patchy. b.Transition occurs around the leaps, where two familiarity 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 contrasting species ( vastness) and abundance of individuals within each species (species evenness) 3. deferral structure: the number of ecological niches, their comparison 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 youthful species arrive, how fast old species become extinct, the size of the island, and the distance from the mainland. 1.

The species residuum 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 mould: rate of immigration of species and rate of extinction of existing species. b.Two island features are importan t: size and distance from mainland. 2.This ! model has been expand to take on habitat islands in protected areas such as depicted object 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 in the first place 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: BestEssayCheap.com

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