In a rather stable system with infrequent disturbances, the competitive dominants in most communities are ¿-selected or conservative species with the attributes of large body size and long life span. They are usually dominant in terms of total biomass, but not dominant in number. 5-selected or opportunistic species with shorter life spans are usually numerically dominant but do not represent a large proportion of the total biomass of the community. After a more significant disturbance, con-servativespecies are usually less favored and the opportunistic species can become dominant as well inbio-mass as in number. Thus, the analyses of r- and K-strategists' distributions can be used for the indication of ecosystem health.
Often, different feeding strategies of organisms are used to describe ecosystem conditions and developments.
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