microhabitat, and their biological characteristics, particularly their 

 reproductive patterns, enable them to achieve remarkable success in this 

 environment. Much of contemporary life history theory is concerned with 

 trade-offs between dispersal ability, fecundity, reproductive effort, and 

 body size (e.g., Stearns, 1984; Olive, et^ aK_, 1984). The situation briefly 

 examined here illustrates two examples of successful trading and probably 

 deserves more detailed study. 



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