Biology 1B Ecology Lecture 4 Page 1 Assigned readings 7th Edition pp 1139 1143 1148 1152 6th Edition pp 1151 1158 1163 1168 Demography Outline of Lecture 4 A Demography 1 Survivorship or Death Schedule 2 Survivorship curves B Reproductive patterns 1 Semelparous 2 Iteroparous C r selected and K selected populations D Idealized r and k species traits A Demography 1 Survivorship or Death Schedule 3 Survivorship curves see Fig 52 4 on p 1087 of text 5th Edit see Fig 52 3 on p 1155 of text 6th Edit 1 0 1 0 0 1 0 1 logx logx 01 01 1 2 3 4 Age 5 1 2 3 4 5 of maximum life span Professor Resh Spring 2007 Biology 1B Ecology Lecture 4 Page 2 Professor Resh Spring 2007 Assigned readings 7th Edition pp 1139 1143 1148 1152 6th Edition pp 1151 1158 1163 1168 Demography Survivorship curves con t 5 3 4 1 If net reproductive ratio Ro 1 female replaces herself Ro 1 population grows Ro 1 population decreases net reproductive rate or replacement rate 3 400 1 000 3 4 B Reproductive patterns 1 Semelparous reproduce in one episode 2 Iteroparous reproduce repeatedly 100 time spent in reproduction 100 0 life span C r selected populations individuals reproduce at an early age semelparous have large clutch sizes K selected populations reproduce later iteroparous have fewer offspring parental care Biology 1B Ecology Lecture 4 Page 3 Assigned readings 7th Edition pp 1139 1143 1148 1152 6th Edition pp 1151 1158 1163 1168 Demography D Idealized r selected and k selected population How would they differ in terms of maturation time short or long lifespan short or long death rate high or low number of offspring per reproductive episode many or few number of reproductions per lifetime one or several timing of first reproduction early or later in life size of offspring small or larger parental care none or extensive Note The sum of all species traits involve trade offs Professor Resh Spring 2007
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