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POPULATIONS

POPULATIONS. DEFINITION : GROUP OF ORGANISMS OF THE SAME SPECIES LIVING IN A GIVEN GEOGRAPHIC AREA EXAMPLES : BEE HIVE, ANT HILL, FLOCK OF GEESE, DANDILIONS IN A LAWN, POD OF WHALES, PEOPLE!. BIOTIC LIMITING FACTORS. BENEFICIAL. HARMFUL. DISEASES SPREAD EASIER AND FASTER

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POPULATIONS

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  1. POPULATIONS DEFINITION: GROUP OF ORGANISMS OF THE SAME SPECIES LIVING IN A GIVEN GEOGRAPHIC AREA EXAMPLES: BEE HIVE, ANT HILL, FLOCK OF GEESE, DANDILIONS IN A LAWN, POD OF WHALES, PEOPLE!

  2. BIOTIC LIMITING FACTORS BENEFICIAL HARMFUL DISEASES SPREAD EASIER AND FASTER COMPETITION AND CONSUMPTION OF RESOURSES HUMAN INFLUENCES • EASE OF REPRODUCTION • FIND FOOD • PROTECTION

  3. POPULATIONS GROW EXPONENTIALLYIF LIMITING FACTORS ARE RESTRICTED WHAT DO YOU NOTICE ABOUT THESE TWO GRAPHS? THIS GRAPH ILLUSTRATES A POPULATION WHRE THERE ARE FEW LIMITING FACTORS CONTROLLING GROWTH THIS GRAPH ILLUSTRATES A POPULATION WHRE LIMITING FACTORS ARE CONTROLLING GROWTH ‘J’ CURVE ‘S’ CURVE

  4. CARRYING CAPACITY The maximum population of a given species that can survive indefinitely in a given environment. WHAT IS THE APPROXIMATE POPULATION SIZE OF HARES THAT THIS ENVIRONMENT CAN CARRY? LYNX? GLASS SLIPPER

  5. How would you count members of the following populations? • Large mouth bass in Lake Lanier • Bacteria E. coli growing on a petri dish • Blue jays in Smokey Mtn National Park • Periwinkle snails on marsh grass • Live oak trees in South Georgia Which were easiest? More difficult? What influenced your method of counting the most? TREES, SNAILS BASS, JAYS, BACTERIA MOVING? VISIBLE? NEED INSTRUMENTS?

  6. HOW ARE POPULATIONS COUNTED? METHODS DEPEND UPON WHETHER OR NOT THE POPULATIONS ARE MOBILE OR STATIONARY; EASY TO SEE OR DIFFICULT TO ACCESS. RANDOM SAMPLING: METHOD USED FOR POPULATIONS THAT DO NOT MOVE. AN AVERAGE OF THE POPULATION SIZE IS MADE USING A GRID AND SELECTION OF SECTIONS AT RANDOM.

  7. MARK AND RECAPTURE METHOD USED FOR POPULATIONS THAT MOVE, OR ARE HIDDEN FROM VIEW. SAMPLE OF THE POPULATION IS CAPTURED, MARKED AND RETURNED. THEN THOSE RECAPTURED WITH MARK ARE COUNTED THOSE THAT AREN’T ARE MARKED.

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