Relationship between Population and Body Mass in Australian Mammals 3.0- Quoll Bandicoot Wombat • Rat-kangaroo x Potoroo o Possom species O Tree kangaroo A Wallaby o Kangaroo Bear cuscus x Glider species 2.0- 1.0- A 0.0- 0.0 1.0 2.0 3.0 4.0 5.0 Log mass (grams) Figure 19.2 Australian mammals show a typical inverse relationship between population density and body size. As this graph shows, population density typically decreases with increasing body size. Why do you think this is the case? Log density (km)

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Population Growth

R and K Selection

R and K selection are concepts in ecology used to describe traits in the fluctuation of a population or population dynamics. For example, they describe the life-association traits between parent and offspring, such as quantity or number of young ones born at a time, quality of parental care, the age to maturity, and reproductive effort.