The organ­isms of a community usually exhibit trophic (feed­ing) relationships among themselves. The term “ecology” was coined by the German zoologist, Ernst Haeckel, in 1866 to describe the “economies” of living forms. Members of a community … (viii) Frequency classes: Dacron classes are formed on the basis of relative frequencies. Characteristics of Communities. There are live frequency classes. Hence it is a zone of tension. Usually, the number and the population density of the species of an outgoing community decreases as we move away from the community or ecosystem. Chapter 53 Community Ecology Lecture Outline . The third level of the ecological hierarchy describes communities of life. Foundation Species (9) A Particular Name : Every community has a particular name by which it is known to the world. It means a community includes all aspects of social life. Each biotic community exhibits a number of characteristics, such as diversity, density, dominance, composition and stratification. E) competitive exclusion. The graph indicated by a "1" demonstrates which principle of community ecology? Community. The community level focuses on the relationship between different species in a community. A community is marked by total organised social life. Understanding community structure and dynamics enables community ecologists to manage ecosystems more effectively. A community is defined as an assemblage of species living close enough together for potential interaction. They also interact in sharing the space and there may be in­teractions at a reproductive and behavioural level. The graph indicated by a "2" demonstrates which principle of community ecology? Population ecology studies the interactions among the individual members of a population. Prevention strategies at this level impact the social and physical environment. It may be narrow (between grassland and forest) or wide (between forest and desert). Communities are complex entities that can be characterized by their structure (the types and numbers of species present) and dynamics (how communities change over time). D) resource partitioning. (b) Synthetic characteristics. It has conditions intermediate to the adjacent ecosystems. The third level explores the settings, such as schools, workplaces, and neighborhoods, in which social relationships occur and seeks to identify the characteristics of these settings that are associated with becoming victims or perpetrators of violence. Genetic diversity may be one of the characteristics of a biologically diverse community… Populations that interact within a given habitat form a community.The number of species occupying the same habitat and their relative abundance is known as the diversity of the community. 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