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Quiz

BIOL 215 Quiz: Assignment 2 BIOL215 - 2017


Department
Biology
Course Code
BIOL 215
Professor
Neil Price
Study Guide
Quiz

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Assignment2,BIOL215
DueNovember10,2017
VALUE=30markstotal(valueofquestion)(15%ofcoursegrade)
1. (5)AnswerthefollowingquestionsusingthedatabelowfortwospeciesofTriboliumbeetles.
Alpha(α),acompetitioncoefficient,istheeffectspecies2onspecies1andbeta()istheeffect
ofspecies1onspecies2.

a. Predicttheoutcomeofcompetitionbetweenthetwospecieswhentheyaregrown
togetherandarecompetingforthesamelimitingresource.UseaLotka‐Volterraplot
andexplainhowthepopulationabundanceofbothspecieschangesascompetition
proceeds.
b. Ifachangeinoneenvironmentalfactordecreasesthecompetitiveeffectofspecies1on
2to0.8(andnoneoftheotherparametersarealtered),thenwhatistheoutcomeof
competitionunderthisnewenvironment?

SpeciesKCompetition
Coefficient
1K1=27.3β=2.7
2K2=35.0α=3.5


2. (5)Undernutrientreplete,optimalconditions,acontinuouslyreproducingmicrobialpopulation
increasesinabundanceby15timesduring5.5daysofgrowth.

a. Whatistheintrinsiccapacityforincreaseofthispopulationperday?
b. Theresourceavailabilityintheenvironmentisdecreasedsothatthesamepopulation
growsaccordingtoalogisticmodelandthecarryingcapacityis1.2x106cells/ml.What
istherealizedpercapitarateofincreaseofthispopulationwhenthepopulationdensity
equals0.9x106cells/ml?
c. Whenthedensityofthepopulationis0.6x106cells/mlwhatistheinstantaneousrate
ofpopulationincrease?

3. (5)Calculatethepopulationchangesfor25generations(useExcel)inahypotheticalpredator‐
preysystemwithdiscretegenerationsinwhichtheparametersforthepreyareB=0.03,Neq=
100,andthestartingdensityis50preyandforthepredators,C=0.5Q=0.02,andstarting
densityis0.2.Graphthepopulationdensitiesofeachasafunctionofnumberofgenerations.
Howdoesthepreypopulationchangefromgenerationtogenerationintheabsenceofthe
predator?Whatarethegeneraleffectsofaddingthepredatorontheprey?


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