BILD 3 Lecture Notes - Lecture 25: Life Table, Northern Fur Seal
30 May 2016
School
Department
Course
Professor
Document Summary
Count samples using standardized census methods (plots, transects) and extrapolate. Count a subset and then multiply to account for the whole population. Capture or count a second sample of animals. Count how many of those are marked (recaptured) 50 pups have the mark, then want to know how many seal pups are there. 50/400 equals 1/8 are marked, then 200 / (1/8) = 1,600 pups. Position of each individuals is independent of others. Individuals aggregate in patches influenced by resource availability or social interactions. Everyone is looking out of the circle, so predators can"t attack from all angles. Negative interactions such as territoriality or resource competition. Can be used to estimate the growth rate of populations in which birth and death rates vary with age. Rate of mortality in the first year: 90 died so 90/115 = 0. 7826 = 78. 26%
