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By C. Lavett Smith

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Figure 47Mean catch per haul of juvenile blueback herring in seines in the mainstream Hudson River estuary, 1976-1979, p. Figure 48Differences in modes of 5 mm length classes of blueback herring between zones in the Hudson River, 1979, p. Figure 49Patterns of freshwater flow in the Hudson River estuary, 1976-1979, p. Figure 50Location of sampling regions (with River Km boundaries) in the Hudson River estuary, p. Figure 51Diagrammatic cross-section of the Hudson River estuary showing strata sampled by Tucker trawl and epibenthic sled, p.

Table 46Regional density (number per 1000 m3) of Atlantic tomcod yolk-sac larvae, Hudson River estuary, p. Table 47Data used to evaluate the hypothesis that during years of relatively high early spring freshwater flows Atlantic tomcod postlarvae in the Hudson River are displaced farther downstream than in years of relatively low flows, p. Table 48Chemical analysis of Sterling Lake water, p. Table 49Mean lengths and weights, their standard deviations, for Gammarus tigrinus at sampling dates after release from females, p.

Each observation (row) contains one value for each variable (column). Each observation in a level is uniquely identified by key identifier variables which contain the special identifier for a given level plus the identifiers from all previous levels. The key identifiers make it possible to match each observation in one level with appropriate observations in other levels. Thus, the levels can be recombined in several ways to facilitate a variety of data set manipulations. Distribution, Abundance, and Species Composition TI Data NEAR-FIELD SURVEYS.

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