Year d interactions with other species for space or resource

Year d) interactions with other species for space or resources-classic experiment with Paramecia ook in at pop: Grown separately One tends \"Or O\' hod P to have a Place or o P kaudatum higer tenders aurelia than the owner to hide They can Grown in mixed culture lire together o o a. 2 4 6 8 10 12 14 16 18 Days Other considerations: a) interactions from competition Paramecia exa c) age ofreproduction Guvenile to senescence) reproductive value d) seasonal effects a weather (regular and catastrophic) thrips example e) effects of habitat degradation fKocarrying capacity) is effectively unknown for natural pops of all species

Solution

d) Interaction with other species for space or resources-classical example of paramecia

1^st diagram: Here both the species of paramecium P. aurelia and P. caudatumare are gwown separately. In this case there is no competition between both species. Therefore these are growing in number and number is increasing with time (days).

2^nd diagram: Here both the species of paramecium P. aurelia and P. caudatumare gwown are grown together. Here you can see that one species population is increasing (P. aurelia) and other is decreasing (P. caudatumare). Here ‘Principle of Competitive Exclusion’ works. When two species are too similar, they cannot co-exsits because one of them will prove superior (dominant) competitor. In other words we can say that two species cannot co-exist when they are actively dependent on same resources.

d) Seasonal effect of weather (regular or catastrophic) strips example

Change in weather also effects the growth of a particular species. One species grow well in winters whereas other in summer or autumn. As the favourable season changes the regular growth is inhibited and whole population is destroyed (catastrophe).

Example: Agricultural crops