Lec 13 Bild 3 2011

Lec 13 Bild 3 2011 - BILD 3 Self-guided field trip UCSD...

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Unformatted text preview: BILD 3 Self-guided field trip UCSD Scripps Coastal Reserve ( http://scripps.ucnrs.org/) (1) Print out field trip form from Ted (2) Head out to the reserve. (3) Hand in completed assignment by last day of class coastal sage scrub - Scripps Coastal Reserve Lecture 13: Population Ecology I I. Density & dispersion II. Demography - life tables III. Life histories Population- group of individuals of the same species that live in the same area and have a chance to mate Population is a fundamental biological unit:- biological species concept is rooted in interbreeding individuals within a population - population genetics considers how allelic variation changes as a function of different evolutionary forces- population biology considers how the size and demography of populations influence their rate of growth and persistence I. Density & dispersion What defines a population? density = the number of individuals per unit area How do ecologists measure density? How to measure density? A. Count - standardized census methods (plots, transects) B. Count sample and extrapolate C. Proxy - nests, feeding damage, tracks D. Mark - recapture Mark - recapture capture 1st sample of animals mark those animals, release capture or count a 2nd sample of animals how many of those are marked (recaptured) paint insects bird bands fish tag Mark-recapture: example with northern fur seal pups Mark-recapture: example with northern fur seal pups Mark - recapture statistics-We captured and marked 200 fur seal pups on a rookery.-Second visit, counted 400 total seals, 50 were marked (1/8).-There are 200 marked individuals, so we assume that the percentage we counted that were marked in our count (1/8 or 12.5%) represents the same percentage that would be marked in the entire population....
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This note was uploaded on 01/16/2012 for the course BILD 3 taught by Professor Wills during the Fall '07 term at UCSD.

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Lec 13 Bild 3 2011 - BILD 3 Self-guided field trip UCSD...

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