BIOL 201 Lecture Notes - Lecture 8: Semelparity And Iteroparity, Anabas Testudineus, Guppy
31 Jan 2018
School
Department
Course
Professor
Document Summary
Demographic theory of optimum reproduction: direct trade off between repro effort and somatic investment, somatic investment is necessary for: homestasis, dispersal, future repro. Aspect of life histories: cost of reproduction. In lady slipper orchids; high levels of fruit production decrease the probability of reproduction in the future: age at first reproduction. Therefore while late reproduction imposes a cost in terms of risk, early reproduction imposes on individuals growth or reproduction. Example; females that breed at age 1 have smaller clutches later on in life than later breeders: allocation to reproducing(reproductive effort, number vs size of offspring, timing of reproduction. Can range from one big end of life reproductive bout to a alrge number of bouts over the life of the individual. Semelparity and iteroparity: external environment and life history. Semelparity: no more than a single reproductive bout during the lifetime of an organism, usually followed by death example; pacific salmon; juvenile survival is increased by females guarding a redd.
