Population Distribution
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1 Why? Popultion Distriution How does popultion distriution ffect the environment? Alsk contins over 127 million cres of untouched forest lnd. It is the lrgest stte in the United Sttes, yet with popultion of nerly 700,000 people it hs the sme totl popultion s Austin, Texs. New Jersey is one of the smllest sttes nd home to popultion of nerly 9 million, ut lmost 1.8 million of its 4.4 million totl lnd cres re untouched nturl woodlnd. Wht re the resons for the wys popultions orgnize themselves, nd wht effect does this orgniztion hve on the environment? Model 1 Popultion Density nd Distriution Hitt 1 Hitt 4 2 km Hitt 3 2 km Hitt 2 Hitt 5 = individul orgnism 1. Refer to Model 1.. Wht do the dots in the digrms represent?. Wht do the oxes in the digrms represent? 2. Clculte the re of single hitt. 3. Consider the rrngements of the dots in Model 1.. Descrie the rrngements of the dots in hitt 3. Popultion Distriution 1
2 . Descrie the rrngement of the dots in hitt Fill in the tle elow y counting the numer of individuls in ech hitt in Model 1 nd then clculte the re ville per individul. Hitt No. Are (km 2 ) No. of Individuls No. of Individuls/Unit re (Density) Refer to the completed tle ove.. Which hitt shows high popultion density?. Which hitt shows the lowest popultion density? 6. Drw verticl line through the middle of ech of the oxes in model 1. Lel the left side nd the right side on ech ox. Complete the tle elow for ech hlf of ech hitt. Hitt No. Are (km 2 ) No. of Individuls No. of Individuls/Unit re (Density) For which of the hitts in Model 1 is popultion density very similr etween sides nd? 8. For which of the hitts in Model 1 is the popultion density quite different etween sides nd? 2 POGIL Activities for High School Biology
3 9. Lel ech of the digrms on Model 1 using the terms clumped (clustered), rndom, nd uniform (even) to descrie the popultion distriution within the oxes. 10. Compre nd contrst the terms popultion density nd popultion distriution. 11. Assuming the popultion size stys constnt, propose t lest two fctors tht might cuse popultion to shift from low density hitt to high density hitt? 12. Animls such s lions or wolves often show clumped distriution. Give reson why this would e dvntgeous for these nimls. 13. Other thn socil resons, list ny other fctors tht my led to clumped distriution ptterns in popultions. 14. For ech of the orgnisms listed elow stte the type of popultion distriution nd popultion density of their hitt. Give reson for ech nswer. Orgnism Distriution Density Reson Tigers Bison Ants Dndelions Apple trees in n orchrd Popultion Distriution 3
4 Model 2 Fctors Affecting Density Fctor Density Dependent Density Independent Food supply Rinfll Flood Prsites Acidity Disese Drought Competition Predtion 15. Refer to Model 2.. Which fctors re dependent on the popultion density?. Descrie how the food supply would e ffected y the popultion density. c. Descrie how the levels or spred of disese would e ffected y popultion density. 16. Wht do ll the density-independent fctors hve in common? 17. In your own words, define density dependent nd density independent y completing the sentences elow. Density-dependent fctors re Density-independent fctors re 18. Density-independent fctors nd density-dependent fctors my e interrelted. For exmple, lck of rinfll tht cuses drought will impct the food supply in hitt. Propose nother piring of density-independent fctor nd density-dependent fctor tht might occur. 4 POGIL Activities for High School Biology
5 Extension Questions Red This! Allelopthy (llelon of ech other nd pthos to suffer ) is the chemicl inhiition of one species y nother. This phenomen is frequently found in plnts where one species of plnt releses chemicl into the environment tht inhiits the growth of nother species of plnt. An exmple is the Creosote ush, which releses terpenes into the surrounding soil to inhiit the growth of other plnts. 19. Descrie wht might e oserved in hitt tht would indicte plnt species is llelopthic? 20. Considering wht you know out popultion distriution, wht type of distriution is likely to rise s result of llelopthy? Justify your nswer using complete sentences. 21. Wht would e some dvntges of llelopthy to plnt? 22. Wht would e some disdvntges to the ecosystem where llelopthic plnts grow? 23. Is it likely tht species tht exhiits llelopthy would evolve over time? Explin your nswer using wht you know out the mechnisms of evolution. 24. The sorghum plnt releses the llelotoxin sorgolene tht disrupts mitochondril functions nd inhiits photosynthesis. Brinstorm with your group some positive pplictions for this llelotoxin. Popultion Distriution 5
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