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