Why is it important to learn cardiopulmonary resuscitation?
Answers
Explanation:
Community ecology is the study of a set of species co-occurring at a given time and place. A central aim of community ecology is to understand how communities are organized by identifying, describing, and explaining general patterns that underlie the structure of communities. An example of such a pattern is that some species never occur together in the same place. Such a pattern may be explained in various ways: one species may exclude the other through competition or, alternatively, they simply prefer different habitats.
Although it may be relatively easy to explain patterns when only a handful of species are involved, it has proven difficult to provide general rules about entire communities where many species co-occur and interact. Such general rules would be very useful as they increase our understanding of how communities function and allow predictions as to how they would respond to environmental changes, for example global warming or restoration efforts. Although there are few rules that are universally true in community ecology (Lawton 1999), there are regular, predictable patterns. Within most natural assemblages a few species comprise the majority of the individuals (Figure 1; Preston 1948). This pattern in distribution of species abundances is accompanied on a larger scale level, by the tendency of widespread species to also occur in higher densities compared to species restricted in their geographic distribution. This relationship is termed the distribution-abundance relationship.