. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MPI. ! 41 40 Cfast SO metres I Slow H Insufficient data FIGURE 2. Gene frequency variation at PGM and MPI in populations of Mesostoma lingua on Bluff C. specimens. None of these populations showed a significant deviation from , although a heterozygote deficiency was evident at both MPI and PGM in the C29 population. DISCUSSION Mesostoma lingua is representative of a large number of aquatic invertebrates which rely on an unsophisticated means of dispersal. Not only are its diapausing eggs passively dispersed, but they l
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MPI. ! 41 40 Cfast SO metres I Slow H Insufficient data FIGURE 2. Gene frequency variation at PGM and MPI in populations of Mesostoma lingua on Bluff C. specimens. None of these populations showed a significant deviation from , although a heterozygote deficiency was evident at both MPI and PGM in the C29 population. DISCUSSION Mesostoma lingua is representative of a large number of aquatic invertebrates which rely on an unsophisticated means of dispersal. Not only are its diapausing eggs passively dispersed, but they lack structures to enhance dispersal such as those found in many terrestrial plants and some aquatic organisms (, ephippial cases of cla- docerans). There is no direct information on the means by which Mesostoma is dis- persed. The diapausing eggs remain within the adult's body until it dies, and during this period can be dispersed as a group. Shorebirds are probably an important dispersal TABLE III Differentiation of PGM and MPI frequencies among 32 populations o/'Mesostoma lingua from 2 rock bluffs. S SE2 V Q2 - SDT -q) DS ST DT PGM MPI .47 .79 .0045 .0028 .060 .057 .006 .0561 .062 .498 .330 .120 .175 .017 .113 .189 q is the mean frequency of the slow allele, SE2 is the sampling variance for demes, s2 is the variance in gene frequencies and F is the inbreeding coefficient. D—deme, S—subdivision, T—Total. Summation signs indicate parameters produced by repeating and summing calculations for each allele (, for both the F and S allele in this case).. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-
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