《生态学》课程PPT教学课件（生态学原理与应用）04 population Dynamics

POPULATIONDYNAMICSSong16.wav

POPULATION DYNAMICS Song16.wav

Dall sheepFIGURE8.1Dall sheep, Ovus dalli

Dall sheep

ECOLOGT:CONCEPISANDAPPLICATIONSFOPUILATIONDINAICSsurvivorshipAcurvetheofsummarizespatternsurvival a population

❖ A survivorship curve summarizes the pattern of survival a population

ECOLOGT:CONCEPISANDAPPLICATIONSFOPULATIONDINAICSEstimating Patterns of Survival

➢ Estimating Patterns of Survival

ECOLOGTCONCEPISANDAPPLICATIONSFOPULATIONDINAICSLife tableCohort : a group born at the sametimeCohortlifetableStatic life tableAge distribution

Life table Cohort : a group born at the same time Cohort life table Static life table Age distribution

ECOLOGT:CONCEPISANDAPPLICATIONSFOPULATIONDINAICSHigh Survival Amongtheyoung

➢ High Survival Among the young

ECOLOGTCONEPISANDAPPLICATIONSFOPUILATIONDINAICSAdolphMurieDall sheepMount DanaliNationalPark,AlaskaCollectingthe skulls of 608 sheep that haddied from varies causes.Makealifetable

Adolph Murie Dall sheep Mount Danali National Park, Alaska. Collecting the skulls of 608 sheep that had died from varies causes. Make a life table

ECOLOGT:CONCEPISANDAPPLICATIONSHORROVDOSubtracting nunber of deToallowcomparisons tootherPlotting age on the x-axisfrom number aliveat thestudres,number of Dall sheepandnumberofsurvivorsbeginning of cach year gisurviving and dying within eachon the y-axis creates athe number alive at theyearof lifeis converted tosurvivorship eurve.beginning of the next ycanumbers per1.000 birthsDall sheepsurvivingtheirfirstyearof lifehaveahighprobabilityotsurvivingto aboutage9Number ofNumber of deathssurvivorsAge (years)during yearat beginning1.000of yearSheep 10 years0-11.0001991,000-199old and older are1-280112easier prey for801-122-378913wolves and dieSN100789-133-4at a high rate.776124-57643dLifetable7345-6Survivorship curve46ete6-7486881069786401325718-94391879-1025215610-11909611-122681012144036312-13Age (years)en13-14FIGURE8.2Dallsheep:fromlifetabletosurvivorshipcunvetdata014-15fromMurie1944)

Survivorship curve Life table

HORROVDNRIOSDesite gotg through more drverte set of lafe1.000stages,theannual plantPhlat drummandis shoasaputemnofsanvivalsinailat toDallsheepAsimilar partem ofVegetaivesurvival bythe rotiferDormantgroathSeadsetFlosouaria conifer,sseadsSNPloweringcomplere within Il dars1001.000-10SON100101210S6240Age (days)FIGURE8.3High raresef survixalamong the voung and middle-agedinplantndrotifpuations(darafromDeeey947oomLewandLevin1979,top)0102030405060Age (weeks)SunvivalbyPdrummomdaiisplayed out in less than a vear

Survivorship curve

ECOLOGT:CONCEPISANDAPPLICATIONSFOPULATIONDINAICSConstant Rates of Survival

➢ Constant Rates of Survival