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Vol. 53 - Alaska Resources Library and Information Services

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general, spatial patterns of larval abundance do not change much, so a<br />

limited number of charts suffice.<br />

However, there were major interannual<br />

changes in abundance, primarily of C. opilio larvae.<br />

The analysis of<br />

these changes was based on statistical comparison of estimates of<br />

monthly mean abundance for the sampling strata outlined in section 2.8.<br />

The data <strong>and</strong> methods are detailed elsewhere (Incze 1983), but the<br />

conclusions are germane to this report <strong>and</strong> are discussed here.<br />

This<br />

section focuses on two objectives:<br />

(1) the definition of areas where<br />

potential impacts on larvae are greatest; <strong>and</strong> (2) an evaluation of the<br />

potential importance of individual larval year-classes to the over-all<br />

recruitment process in populations of C. bairdi <strong>and</strong> C. opilio.<br />

Intra-annual patterns of abundance (hatchout <strong>and</strong> development) were<br />

addressed earlier <strong>and</strong> are not illustrated here.<br />

Figures 4.10 <strong>and</strong> 4.11 summarize the distribution <strong>and</strong> abundance data<br />

from May <strong>and</strong> June of 1978 for C. bairdi <strong>and</strong> C. opilio, respectively.<br />

Larvae of both species were abundant in 1978, <strong>and</strong> a large portion of the<br />

southeastern Bering Sea was sampled (cf. Figs. 4.10 <strong>and</strong> 4.11 <strong>and</strong> cruise<br />

maps in Section 2.0).<br />

Figures 4.12 <strong>and</strong> 4.13 show the data for both species<br />

collected in 1980 <strong>and</strong> 1981.<br />

These years were both years of very<br />

low larval abundance of C. opilio over most of the study area (the<br />

region east <strong>and</strong> northeast of the Pribilofs excepted).<br />

Data for 1980 <strong>and</strong><br />

1981 are illustrated to show the low larval abundance of this species<br />

<strong>and</strong> the distribution of C. bairdi larvae in 1981 along the <strong>Alaska</strong><br />

Peninsula, a region not sampled very much in earlier cruises.<br />

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