BIOL 2060 Lecture Notes - Lecture 2: Parental Investment, Climax Community, Trophic Cascade

• School: University of Guelph
• Department: Biology
• Course: BIOL 2060
• Professor: Norris

Document Summary

Life history: the (cid:272)olle(cid:272)tio(cid:374) of age spe(cid:272)ifi(cid:272) t(cid:396)aits that di(cid:396)e(cid:272)tl(cid:455) affe(cid:272)t a(cid:374) i(cid:374)di(cid:448)idual(cid:859)s (cid:396)ep(cid:396)odu(cid:272)ti(cid:448)e su(cid:272)(cid:272)ess. Together these traits are called a life history strategy. Examples of life history traits: number of reproductive events per lifetime (one, few, many, nu(cid:373)(cid:271)e(cid:396) of offsp(cid:396)i(cid:374)g pe(cid:396) (cid:396)ep(cid:396)odu(cid:272)ti(cid:448)e e(cid:448)e(cid:374)t (cid:894)(cid:862)(cid:272)lut(cid:272)h size(cid:863)(cid:895, age at first reproduction, relative length of life history stages (egg or seed, juvenile, adult) Investment per offspring (small versus large offspring: the probability of dying at different life history stages. Lobelia telekii: lives for many years; flowers once, then dies; produces a large inflorescence (many flowers) and many seeds per flower; higher adult mortality. Lobelia deckenii: lives for many years; flowers repeatedly before dying; produces a small inflorescence and fewer seeds per flower; lower adult mortality. Working definition of a population: a group of organisms of the same species occupying a space at a time.