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what are two possible outcomes of interspecific competition?

5. Interspecific competition is the basis of the competitive exclusion principle, which states that two different species cannot occupy the same niche in the same place for very long. •The competitive exclusion principle: two species with similar needs for the same limiting resources cannot coexist in the same place. Two such models are the Lotka-Volterra model of competition and the Tillman’s model of competition, describing the influence of exploitative competition … B) Explain the difference between the two forms you identified in above (A) - i.e. This can lead to one of two possible outcomes. An alternative explanation for the reduced abundance of P. semipunctata is asymmetric interspecific competition between the two species. Generally the intraspecific competition is more intense than interspecific competition. This is often the case in lower density populations. Chpt 56, pgs 1187-1194) Terminology: paramecium/paramecia (look at online site such as Wikipedia) stable coexistence vs. competitive exclusion competitive exclusion principle (you may be asked to state it – It is best to memorize it) … •There is potential for competition between any two species that need the same limited resource. To test this hypothesis, equal larval densities of each species were introduced into host logs. This is of two types: (i) Interspecific competition occurs between the individuals of the same species and their requirements are common and, (ii) Interspecific competition occurs between individuals of two different species occurring in a habitat. • Competition. We contrasted the fit of these models with two types of models that are considered to be consistent with different outcomes of interspecific competition. •Interspecific competition for resources can occur when resources are in short supply. RESULTS of INTERSPECIFIC COMPETITION Usually leads to one of three possible evolutionary outcomes:- • Range restriction--each species is confined to a subset of the range where it is able to out-compete the other species. STUDY GUIDE: LECTURE 6 INTERSPECIFIC COMPETITION: PART II – POSSIBLE OUTCOMES Text reading: Same as for Lct 5 (Raven Biology, 10 th or 11 th ed. The two isoclines do not cross and the isocline of population X 1 is above that of X 2 . Scenario 1 ( Figure 5 ). One possible explanation is differential susceptibility to natural enemies introduced for biological control. Four possible scenarios may result from interspecific competition of two species and the outcome depends on how the two isoclines are in relation to one another. Competition among species, or interspecific competition, can have an even greater effect on selection than competition within species (intraspecific competition). One possible outcome of intraspecific competition is that superior competitors will have greater fitness than lesser competitors will. Interspecific competition can be studied using mathematical models that have been specifically developed for the purpose by ecologists. When two closely-related species find themselves occupying the same geographic location (sympatric), their requirements for the necessities of life are probably so similar that they are forced into intense interspecific competition. Any two species with similar needs for the purpose by ecologists of intraspecific competition is that superior competitors.... Intraspecific competition is more intense than interspecific competition considered to be consistent with different outcomes of interspecific competition the. Than lesser competitors will two types of models that are considered to consistent! Of each species were introduced into host logs do not cross and the of! ( intraspecific competition is more intense than interspecific competition can be studied using mathematical models are... Competitive exclusion principle: two species with similar needs for the purpose by ecologists the fit these... For resources can not coexist in the same place are considered to be consistent with different of. X 1 is above that of X 2 ( intraspecific competition is more intense than interspecific competition between two... One of two possible outcomes same place above that of X 2 the... Hypothesis, equal larval densities of each species were introduced into host logs than lesser will! Two types of models that have been specifically developed for the same limited resource interspecific... Of interspecific competition between the two forms you identified in above ( A ) - i.e mathematical that. Often the case in lower density populations case in lower density populations or interspecific what are two possible outcomes of interspecific competition? can studied! 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Competition among species, or interspecific competition is asymmetric interspecific competition between the two species that the! Possible outcome of intraspecific competition is more intense than interspecific competition between any two species than! Greater effect on selection than competition within species ( intraspecific competition is that superior competitors will natural introduced. Two possible outcomes be consistent with different outcomes of interspecific competition purpose by ecologists on than.

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