Adaptations which aid wind dispersal will often result in efficient dispersal by flowing water; seeds with an impermeable seed coat (probably an adaptation to impart dormancy) may be effective at dispersing in water, and yet it is difficult too argue that they have been selected for the dispersal ability of their seeds.引自第62页
It should be possible to distinguish between behaviour driven primarily by the environment and behaviour driven mainly by density. If we set up plots at a range of densities, their changes over generations should show a marked degree of synchrony if weather is primarily driving dynamics, whereas if dynamics is deiven by density their trajectories will vary independently in a manner predicted by the model for that density.引自 The intrinsic dynamics of population density
It has been estimated that in 1830 it required 58 hours of labour to cultivate ang harvest one acre of cereal crop; 150 years later this was achieved in just two (Kirby, 1980)..引自第243页
