FA2008 - BILD 3 - Lecture 08 (Popluation Ecology - 01)

FA2008 - BILD 3 - Lecture 08 (Popluation Ecology - 01) - C...

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10/23/08 1 Lecture 8 Population Ecology Reading Ch. 53 Midterm pp. 1174 - 1177 Ecology – study of the interactions between organisms and their environment Population ecology Species - group whose members have the potential to interbreed in nature and produce viable, fertile offspring Population - group of interbreeding individuals (within a species) Species often composed of many populations Overview - Population Ecology I. Population density II. Population dispersion III. Demography - Life tables IV. Life Histories V. Population growth – Exponential – Logistic VI. Population regulation VII. Human population growth I. DENSITY - the number of individuals per unit area How to measure density? A. Count B. Count sample and extrapolate C. Proxy - nests, feeding damage, fecal droppings D. Mark - recapture
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10/23/08 2 How to measure density?
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Unformatted text preview: C. Proxy- nests, feeding damage, fecal droppings African savanna elephants - count from a plane African forest elephants - notoriously hard to count, elusive Richard Barnes (UCSD) - developed 1st method to quantify forest elephant density using dung How to measure density? D. Mark-recapture capture 1st sample of animals mark those animals, release capture 2nd sample of animals how many are marked (recaptured) D. Mark-recapture-How to mark animals in the field? Paint insects Band birds Metal rings around legs of invasive crabs Fish tag D. How to measure density? Mark - recapture N = n 1 n 2 m Say you capture and mark 10 turtles in a lake On a 2nd visit, you capture 15 turtles 5 turtles are marked N = 10*15 5 = 30 N = population size n 1 = # captured & marked n 2- # captured in 2nd sample m - # re captured...
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FA2008 - BILD 3 - Lecture 08 (Popluation Ecology - 01) - C...

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