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BIOL 208 (March 3, 2014) - Lotka-Volterra Models and Coexistence

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University of Alberta
Biology (Biological Sciences)
James Cahill

BIOL 208 (March 3, 2014) • Lotka-Volterra Models o You must be able to calculate the α values when given other values o Arrows show trajectories of population change in population of species 1 and 2 o If the lines do not cross, the line that is higher up than the other is the species that wins out in competition  THESE SPECIES CAN NOT COEXIST o What does a crossing point mean?  It means that the population growth of both species is 0  Eventually tough, one species will win out the other o If populations are below their respective isocline, they will grow until the isocline is reached o If there are two non-intersecting isoclines… one isocline will not be affected by the other isocline o Left over time, the species population will equal that of its carrying capacity • If species hurt themselves more than the other species hurts them, there is stable coexistence… and vice versa. • Competition alters distributions o Lower limit of Chthamalus within intertidal zone affected by presence of Balanus  Competition may or may not cause exclusion… • Community invisibility – NICHE o Empty niche hypothesis  High niche overlap = higher interspecific competition  Lower niche overlap = less possibility of exclusion (especially if there are other resources) = higher chance of coexistence o Free niche spaces  there are resources
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