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Chapter 11

Chapter 11 - competition.docx

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York University
BIOL 2050
Christopher Lortie

Chapter 11 – Competition  Figure 11.2 – nice example of multifactorial experiment and they figured that carnivorous plants mostly grow on nitrogen poor soil or very poor conditions so they know they’re very competitive so they know they had to eat bugs to get the missing nutrients that they needed  Competition is -,- it is an interaction between individuals where each is harmed through their shared use of a limiting resource  Remember, splits for competition the first split or first set of splits is INTERspecific (between species) and INTRAspecific (within species)  Resources are a feature of the environment  Know the difference between physical factor and a resource  Resources are required for growth, survival, reproduction and can be depleted such as food, water and space – Figure 11.3  Physical factors are not consumed and are not depleted such as temperature, salinity and pH  Direct is interference (letting out chemicals that inhibit growth or they’re shading them out so they don’t get light)  Indirect is mediated through a resource (eating all the food before another species can)  Exploitation competition – species complete indirectly so you reduce the resource availability  Interference competition – species compete directly  Allelopathy – (allelo means chemical and pathy means sickness or disease) plants of one species but sometimes its marine organisms but generally its plants that release toxins that harm other species  Competition can be symmetrical or asymmetrical  Figure 11.7 – example of niche overlap, rodents and ants both eat seeds. Their peaks are different but as you can see, the x-axis is the same and it does overlap. Good example of 2 very different species competing for one resource.  11.8 – explains that competition does explain the distribution of o
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