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Lecture 13

BIO205 Lecture 13 (Oct 22, 2012) - EDIT.docx

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University of Toronto Mississauga
Christoph Richter

BIO205 - Lecture 13: Competition o Particular types of interactions between populations - Competition is everywhere o Asterionella fornosa o Synedra ulna o Housing made out of silicates - Diatoms require silicate o Decrease populations means decreasing silicates o Other diatoms might compete for silicate o Silicate drops quickly when both species are there  Synedra stayed at the same level of populations as when grown by itself; there’s something in them that allows for them to compete better - Is competition limited to similar species? o Is there competition between rodents and ants for seeds? o Looking at feeding times? o Limit the resources and see what they do? - Results confirmed that there is competition between rodents and ants o Do populations do better when alone?  Ant colonies increased by 71% compared to control plots  Rodent populations increased by 18% compared to control plots o Do ants or rodents impact seed populations?  In plots without ants or rodents, seed density increased by 450% o Does one population get less seeds when in the presence of the other?  Plots with only rodents or ants had about the same seed density as co
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