The ability of two competing species (species 1 and species 2) to coexist in the

Question

The ability of two competing species (species 1 and species 2) to coexist in the same area and time depends on their respective competition coefficients (4m 142) and carrying capacities (K, and K). For the various conditions listed below, determine whether or not both species 1 and species 2 could invade an environment in which the other species already existed at or near its carrying capacity. You can use either phase state graphs or the table of inequalities given in lecture to make these determinations. 1. K2 160 100 40 160 0.1 0.1 100 0.1 40 01 0.1 0.1 40 40 .9 160 0.9 100 160 100 0.9 0.9 O.9 160 0.9 9 160 40 100 100 0.1 09 0.1 0.9 0.9 40 160 0.1 100 160 40 100 40 160 0.9 0.9 0.9 0.1 0.1 0.1 Distinguish between 'interference competition' and 'exploitative competition' and give a biological example of each. 2.

Explanation / Answer

part 2:

In eploitation competetion organisms use up resources directly.Once used,the resources is no longer available for other species to use.

In interference competetion one organism prevents other organisms from using the resources .

Of the two mechanisms explotation competetion is more common.

part 3:

GRAPH 2

species 1 is below its isocline & increses,while species 2 is above its isocline & decreases.The joint movement of the two populations {thick black arrows} is down & to the right,so species2 is driven to extinction.and species one increases untill it reaches carring capacity{k1}

the open circle at this point represent a stable equilbrum

in this scenario,species 1 always outcompetes species 2,and it refer to as the competetive exclusion of species2 by species 1.

GRAPH1:

In this case both species carring capacities are lower than the others carring capacity divided by the compettetion cofficient again below both isoclines the population increase& above both isoclines the poulation decreases

in this case ,however when the populations of the two species are between the isoclines their joint trajectories always head toward the intersection of the isoclinesrather than outcompeting one another,the two species are able to coexis at this stable equlibrium point{open circle} this is the outcome regardlessof the intial abundances

part4:

The carring capacity of species1{k} is higher than the carring capacity of species2 divided by competetion coefficient{k2/a21}and the carring capacity of species2{k2} is higehr than the carring capacity of species1 divided by the competetion cofficient{k1/a12}

so there is a unstable equilibrium piont or closed circle.

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