BI111 Lecture Notes - Lecture 29: Semelparity And Iteroparity, Poecilia
Document Summary
Type i: high survivorship unil late in life. Type ii: constant rate of mortality in all age classes. Type iii: high juvenile mortality, followed by low mortality ater criical age and size. The schedule, frequency and duraion of events in an organisms lifeime: paterns, growth, maturaion and reproducion. Allocaions of resources inluence evoluion of maintenance, growth and reproducive traits: usually adjusted to maximize an individuals number of surviving ofspring (shaped by selecion) Fixed energy budget may result in trade-ofs between fecundity and parental care: passive parental care before ofspring born. 10 eggs at 100 units of energy = 1000 total. 1000 eggs at 1 unit energy each = 1000 total: acive parental care ater ofspring born. Semelparity (salmon: one reproducive episode, devotes all stored energy, maximum fecundity, death ater reproducion. Iteroparity (oak tree: muliple reproducive episodes, only some energy devoted in each event. Early reproducion favoured (fruit lies: adult survival rates low, animals do not grow more fecund with age.
