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Vol. 53 - Alaska Resources Library and Information Services

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Figure 6.15<br />

P. tridens larval abundance in strata 2 <strong>and</strong> 3 during<br />

May <strong>and</strong> June from PROBES 1978, 1980 <strong>and</strong> 1981. Values<br />

expressed as mean density +1 st<strong>and</strong>ard error. Zero<br />

stations are not included in these calculations. The<br />

number of positive stations (n) <strong>and</strong> the total number<br />

of stations sampled (N) for each stratum-year combination<br />

is shown above the bars.<br />

735

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