BIOL 2Q04 Lecture Notes - Lecture 13: Survivorship Curve, Daphnia, Reaction Rate Constant
6 Nov 2018
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Discrete populations: have spurts (breeding seasons), no constant births, no overlaps. Geometric growth: population keeps growing and nothing stops it. Density independent: daphnia 1/2ml treatment, calculate, hould(cid:374)(cid:859)t (cid:271)e (cid:1006)4 adults at day (cid:1005, 1) ro = lxbx, 0+18. 6169+28. 202+14. 8073+13. 616+2. 76133+1. 96333+2. 412+0. 972+1. 29911+0. 48356. +6. 062222+2. 330667+1. 617778+2. 796889+0. 56+0)/86. 24: 2) g = , 254. 048672/86. 24, =2. 95 days. 30/10/2018: g=545. 02/252. 52= 2. 16 days r=ln(252. 52)/2. 16days =2. 56 females/female/day lambda= e^(2. 56)= 12. 94 females/female/day, see density dependent, u(cid:373)(cid:373)ary: what(cid:859)s happe(cid:374)i(cid:374)g, as de(cid:374)sity i(cid:374)(cid:272)reases . Low densities can also lead to harmful effects of inbreeding and a higher predation risk: example, populations of cowslip with fewer than. 100 individuals produced fewer seeds per plant than larger populations. 30/10/2018: populations are often regulated by both positive and negative density dependence. If ro = 1. 5; nt = 10 when t = 0. Low density= birth rates increase and death from enemies/disease low: high density=birth rates slow and death rates increase due to disease, predation, food, al(cid:449)ays sa(cid:373)e (cid:272)halle(cid:374)ge shortage, etc.
