BIOL 2260 Lecture Notes - Lecture 3: Quadrat, Ecolo, Cluster Analysis
5 Jul 2016
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True census: counting all individuals (usually impossible) It is critical to sample randomly, including all good or bad plots. Only including the good plots will skew estimation and overestimate population size. Mark-recapture: consists of capturing and marking individuals, resample and determine what proportion are marked, photographic mark-recapture: Uses distinctions of the organisms features to identify: assumptions for mark recapture. No change in population size over sampling period. All animals have an equal chance of being captured and recaptured (trap shy vs. trap happy) Sufficient time has elapsed to allow mixing of marked individuals. Grain: size of sample unit or resolution. Extent: size of study area: grain is also used in terms of size of habitat patches relative to animal mobility. Both distribution and density are sensitive to scale. What is the density of the dreys. What landscape features correlate with drey density o. Ultimate goal to compare results assuming different number of population units.
