BIOL 2Q04 Lecture Notes - Lecture 5: Relative Density, Overfishing, Quadrat
2 Dec 2015
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Individuals of the same species: space and time. Unit: like you, dog, cats: predictable from conception, from a zygote through sexual reproduction and growing to a genetically unique individual. Zygote develops differently modules that have same genetic material. Most plants are modular: take a root or a shot and you can start a new. What kind of questions can we ask: is a population increased or decreased over time, is this fish species declines because of overfishing, is this rare species recovering due to conservation management. Two approaches: absolute density: # of individuals/ml,ha or km^2, relative density: one population compared to another, techniques will vary . Sampling methods: often not practical to count every individual, sampling: taking a part of the system and extrapolate to get an estimate of total population size. Measuring population density: trees- plotless sampling- point-quarter technique, the point-quarter technique, point a located randomly, division into 4, nearest tree in each quadrant, id, measures.
