. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BIVALVE SPATIAL DISTRIBUTION 179 as to produce a corresponding range in distance to nearest neighbors. This factor is inferred to operate if there is a correlation between nearest-neighbor distances and the sum of their sizes (Connell, 1963). Two experiments were tested for this effect. In both analyses (analysis l:r- , == 33, F — ; analysis 2: r -- , == 33, F -- ) no significant correlation was found. In conclusion, it is judged that Nitcula maintains a random distribu- tion in a hom
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BIVALVE SPATIAL DISTRIBUTION 179 as to produce a corresponding range in distance to nearest neighbors. This factor is inferred to operate if there is a correlation between nearest-neighbor distances and the sum of their sizes (Connell, 1963). Two experiments were tested for this effect. In both analyses (analysis l:r- , == 33, F — ; analysis 2: r -- , == 33, F -- ) no significant correlation was found. In conclusion, it is judged that Nitcula maintains a random distribu- tion in a homogeneous experimental environment. The two field samples from station R show that the spatial pattern of Nucnla proximo, in its natural habitat is also random. One sample was sieved core by core into 4 size fractions ( mm, mm, mm, and mm) and these. FIGURE 2. Multiple-coring device used in collection of Station "R" samples. Diameter of each core is cm. groups were evaluated individually. The spatial pattern for all size fractions com- bined was evaluated for both sample sets. In both sample sets only 29 cores were recovered successfully. The results of the analyses are shown in Table III. In all cases but one the spatial pattern is random. The one exception, size fraction c, is aggregated. There are slight tendencies in all of the field samples towards aggregation ; being probably an indication of the heterogeneity of the environment. It must be remembered that the total area sampled by each core set is equal to about twice the area of the largest experimental tray. Thus the chances for en- vironmental heterogeneity are greatly increased, especially since the environmental area is by no means approximately homogeneous; as in the experimental trays. These results clearly show the need for contrasting lab and field studies of spatial. Please note that these images are extracted from scanned page images that may have been digitally enhanced for re
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
