EEB319H1 Midterm: Midterm Summary Notes
24 Oct 2016
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Ex: every whale in small population, migratory salmon (2) index of abundance. Measure index that is proportional to population size. Ex: catch-per-unit-effort: hillborn vs pauly, hillborn: use stock assessments sustainable fishing, pauly: stock assessments not good enough, might miss range dynamics, biased to rich countries collapsing fisheries (3) random sample. Can scale counts up to habitat level. Assumptions made when scale from local to regional level (4) distance sampling. Measure distance between individuals observed and where on transect observation was taken. Account for fact that closer individuals more easily observed with probability distribution as function of distance. Equation: n = n n* = n/ (5) mark recapture. Could be result of patchy distribution of resources or for cooperation tactics. Location of next individual independent of the next. Every individual has equal probability of being in every spot. School of fish want similar distance from neighbours. A school of fish has both uniform and aggregated distribution.
