|294 HETEROCHRONY AND PAEDOMORPHOSIS
cannot afford to liberate such a small number freely into the plankton. In my reading, I have been struck by how many of the smallest progenetic organisms, living in obvious r environments and possessing all other classical attributes of an r strategist, brood a few relatively large eggs. Neither Hoagland nor I are attacking the concept ofr and K strategies, but merely one of the criteria advanced for larger organisms and then extrapolated to smaller ones without adequate consideration of structural and energetic constraints. We must remember that lowered fecundity does not imply a smaller r if maturation is correspondingly accelerated. If, as Lewontin argued (1965), accelerated maturation is more effective than increased fecundity in raising r, then a progenetic trade of reduced fecundity for markedly accelerated maturation will provide an excellent r strategy for tiny animals. Harper (1967, pp. 255–256), in the quotation cited previously, noted the effect of a few precociously produced offspring in raising r.
To be effective in ecological time, heterochrony must be a potentially rapid response to changing conditions. Before testing my general hypothesis, I will discuss the most important data concerning potential ease and speed of heterochronic change.
The Potential Ease and Rapidity