Zoo 510 4-26

Zoo 510 4-26 - Zoo510ThursdayLecture 15:07 Isotopebasics(I)...

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Zoo 510- Thursday Lecture 15:07 Isotope basics (I) Atoms Carbon- atomic number (6) Atomic mass (12-14) Isotope basics (II) 12C- 98.9% of carbon atoms on earth 13C-you are what you eat we have an ecological tracer here if carbon says -20 then they are feeding on inshore benthic algae food chain or offshore open water phytoplankton food chain at -30 most of the time when we catch a fish it measures somewhere in the middle getting  energy off both food chains Estimating energy source NITROGEN isotopes ***it does something very different it increases at each level increases from prey to predator by ~3.4% Rule: you are what you eat…plus 3.4%! What about a real, complex food web? 15N reflects trophic position of consumer Trophic position= mean number of trophic steps leading to a consumer, incorporates  omnivory
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Outline 1. study systems Study systems: lakes of central Ontario Basics- Pelagic food chain
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This note was uploaded on 12/11/2011 for the course ZOO 510 taught by Professor Staff during the Spring '08 term at Wisconsin.

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Zoo 510 4-26 - Zoo510ThursdayLecture 15:07 Isotopebasics(I)...

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