. Bulletin. Science; Natural history; Natural history. 1 I I I r 1987 1988 1989 1990 1991 1992 1993 o E ^ E TO H I CO n = 15 11 0. 1987 1988 1989 1990 1991 1992 1993 Survey year Fig. 4. Patterns of variation in growth and survivorship of tagged abalone (N = sample size). A. Mean recapture rate (± 1 ). B. Mean relative weight (± 1 ) (see text). C. Mean shell growth rates (±1 ). Discussion Black abalone on Santa Cruz Island exhibited a net decline in abundance throughout the seven-year study period. Annual survivorship of tagged individ- uals, which averaged 8% in all
. Bulletin. Science; Natural history; Natural history. 1 I I I r 1987 1988 1989 1990 1991 1992 1993 o E ^ E TO H I CO n = 15 11 0. 1987 1988 1989 1990 1991 1992 1993 Survey year Fig. 4. Patterns of variation in growth and survivorship of tagged abalone (N = sample size). A. Mean recapture rate (± 1 ). B. Mean relative weight (± 1 ) (see text). C. Mean shell growth rates (±1 ). Discussion Black abalone on Santa Cruz Island exhibited a net decline in abundance throughout the seven-year study period. Annual survivorship of tagged individ- uals, which averaged 8% in all years except 1991-1992, were low compared to other studies. Mean annual survivorship of ten species of abalone ranged from 0-92% but averaged 39% (Shepherd and Breen 1992). A better comparison can. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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