. The Biological bulletin. Biology; Zoology; Marine biology. POPULATION STRUCTURE IN MOLE CRABS 213 => 5 5 X = ± {139). ± [66) 3 4 5 6 7 8 9 10 II 12 13 14 SIZE CLASS (mm) Figure 4. Changes which occurred in cumulative percentages of males, as in Figure 3 for females. Initial samples (A) yielded only two modes, as against the four to five modes for females. Final samples (B), however, resulted in three discrete modes for males. The convergence of the two lines representing the largest males agrees well with the concept of of a maximum size reached by that sex. Means, sta
. The Biological bulletin. Biology; Zoology; Marine biology. POPULATION STRUCTURE IN MOLE CRABS 213 => 5 5 X = ± {139). ± [66) 3 4 5 6 7 8 9 10 II 12 13 14 SIZE CLASS (mm) Figure 4. Changes which occurred in cumulative percentages of males, as in Figure 3 for females. Initial samples (A) yielded only two modes, as against the four to five modes for females. Final samples (B), however, resulted in three discrete modes for males. The convergence of the two lines representing the largest males agrees well with the concept of of a maximum size reached by that sex. Means, standard deviations, and sample sizes are as shown in Figure 3. Sex ratio curves An earlier analysis (Wenner, 1972) revealed that sex ratio may vary with size in marine Crustacea. At the time, such variation was believed to form a pattern characteristic of a species or population. It is clear from more recent results obtained from mole crabs both in Hawaii and Enewetak that the "characteristic pattern" hypothesis is now untenable. The data published in 1972 indicated an "intermediate" sex ratio pattern for Hippa pacifica in Hawaii, but data gathered later at Enewetak in 1972 yielded a "reversal" sex ratio pattern for the same species (see Fig. 5A).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Press, inc. [etc. ]
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