BIO120H1 Lecture 7: Biology lecture 7.docx

• School: UTSG
• Department: Biology
• Course: BIO120H1
• Professor: James Thomson

Document Summary

Population overshoot- population quickly increases until carrying capacity and once there pop quickl falls. tau in equation provides time delay. Increasing delay creates large overshoot allee effects was interests in social benefits hel in pop growth. If number fall below it, pop goes to extinction. If were above carrying capacity, trouobles also occurs. On pop pyramid, we look at ages of sexes. Age structure has age classes fecundity anf survivorship vary by age age class intervals. Arbitrary unitsof time chosen to five a reasonable # of age classes for the organism in question. Life tables statsitacl average for an individual in a population survivorship schedule l(x)= probaaility of beng alive a age x. Taking log of exponential line gives straight line. Type1: humans where risk of death small in early life higher in later life. Iii: detah higher in early life as many eggs made.