We examined the preferences of female guppies (Poecilia reticulata) from 11 localities in Trinidad with respect to male color-pattern elements, body shape and size, and overall color and brightness contrast. Females are on average more attracted to males from their own population than from alien populations, and populations appear to vary in the criteria used in female choice. Multiple-regression analysis suggests that mate-preference criteria vary among localities in intensity, sign, and the number of traits used. Although preference estimators and color-pattern parameters are unique to each population, only orange, black, and color contrast showed a correlation between degree of male trait and degree of preference for that trait. There is a clear effect of water color and a possible effect of predation intensity. The results are discussed in light of various models of sexual selection and the early stages of speciation.

69 (1989)]. 11. The Rb. capsulatus strain U43 does not express RCs or light-harvesting antennae complexes LH I and LH II. The RC L-and M-subunit genes and the LH I a and 13 subunit genes had been deleted by interposon mutagenesis [D. C. Youvan, S. Ismail, E. , unpublished results.14. Molar volume differences were calculated with values taken from 13-20.19. Spontaneous revertants were obtained by inoculating liquified medium containing 1.5% agar with a serially subcultured mutant stock, each started from a single purified colony. Samples were incubated at 32'C in 10 mW cm-2 white light. PSrevertants from the DMM mutant were obtained at lower light intensity, -1 mW cm-2. PSf revertants DLL7b and DLL7d were isolated from liquid cultures grown anaerobically under high light conditions to enhance the probability of multiple reversions. 20.

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