ON THE CHARACTERISTICS OF HORIZONTAL DISTRIBUTION OF THE ANTARCTIC KRILL (EXTENDED ABSTRACT)

• Main Author: Noboru Matsuura
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Antarctic; The Antarctic; Antarc*; Antarctic Krill
• 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

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