Observed patches of walleye pollock eggs and larvae in Shelikof Strait, Alaska: their characteristics, formation and persistence
作者： PHYLLIS J. STABENO , JAMES D. SCHUMACHER , KEVIN M. BAILEY , RICHARD D. BRODEUR , EDWARD D. COKELET
DOI: 10.1111/J.1365-2419.1996.TB00084.X
关键词:
摘要: Using observations from 38 ichthyoplankton surveys conducted near Shelikof Strait, Alaska between 1979 and 1992, we characterized the horizontal distribution spatial patchiness of early life stages walleye pollock (Theragra chalcogtamma). Lloyd's index ranged 3.9-6.1 for eggs 3.9–16.2 larvae. This was size (age) dependent: low eggs, high newly hatched larvae, then decreasing through late larval stage. By juvenile stage, increased as began to school. The percentage larvae in a patch (defined present at stations where counts exceeded mean by one standard deviation during given survey) varied greatly (26–92%). Larval distributions were used deduce physical mechanisms responsible patches. Three categories patches identified: those created interaction with time-dependent currents, vicinity Sutwik Island, associated eddies. Simulation experiments utilized examine processes influencing formation role swimming. Between 5 6 weeks after hatching, have swimming abilities that enable them maintain already mechanisms.
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