|
r-strategist |
K-strategist |
|
|
|
|
Large litter size |
Small litter size |
|
Short birth spacing |
Long birth spacing |
|
Many offspring |
Few offspring |
|
High infant mortality |
Low infant mortality |
|
Little parental care |
Much parental care |
|
|
|
|
Rapid maturation |
Slow maturation |
|
Early sexual reproduction |
Delayed sexual reproduction |
|
Short life |
Long life |
|
High reproductive effort |
Low reproductive effort |
|
High energy utilization |
Efficient energy utilization |
|
Low encephalization |
High encephalization |
|
|
|
|
Opportunistic exploiters |
Consistent exploiters |
|
Dispersing colonizers |
Stable occupiers |
|
Variable population size |
Stable population size |
|
Lax competition |
Keen competition |
|
|
|
|
Low social organization |
High social organization |
|
Low altruism |
High altruism |
Note. Modified from Pianka (1970, p. 593, Table 1) E. O. Wilson (1975, p. 101, Table 4-2), Eisenberg (1981, p. 442, Figure 156), and Barash (1982, p. 307, Table 13.1).