ON THE CHARACTERISTICS OF HORIZONTAL DISTRIBUTION OF THE ANTARCTIC KRILL (EXTENDED ABSTRACT)
The horizontal scale dependence of the Antarctic krill distribution was examined by power spectral analysis. Data used were collected by a scientific fish finder (SIMRAD EK-S120) in the area between 61'-65's and W-112'E (Leg I) and in the area between 63'-66's and 145'-...
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.494.29 http://polaris.nipr.ac.jp/~penguin/polarbiosci/issues/pdf/1989-Matsuura.pdf |
| Summary: | The horizontal scale dependence of the Antarctic krill distribution was examined by power spectral analysis. Data used were collected by a scientific fish finder (SIMRAD EK-S120) in the area between 61'-65's and W-112'E (Leg I) and in the area between 63'-66's and 145'-150Â ° (Leg 11) during the SIBEX cruise of T/V UMITAKA-MARU (Jan. to Feb. 1984). The mean volume of back-scattering strength was calculated between 10m and 100m of depth, and the values of krill density were estimated at intervals of 1 mile in Leg I and 0.1 mile in Leg 11. For details on these technique, see INAGAKE ef al. (1985). Figure 1 shows continuous profiles of krill density for Leg I (upper) and for Leg I1 (below). Night-time estimates of krill density were 56 % for Leg I and 40 % for Leg I1 of daytime (between 0700 and 1900 local ship time) values. Therefore, only daytime profiles of krill density were used. As the data averaged over 1 mile intervals in Leg I were too wide to have signifi-cant result, the spectral density function for the krill resembled a white noise spectrum |
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