. Bulletin. Science. SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. T 60 80 No. guts analyzed 120 Fig. 3. Randomized cumulative prey curve for all fish with gut contents analyzed in: A) fall 1992 (warm period; n = 116); and B) spring 1994 (cool period; n = 97). Mean values are plotted. Error bars represent plus or minus one standard deviation. Lack of an asymptote on either graph is an indication of the diversity of diet within these larger groups, and the need to analyze diet within smaller functional groups of spotted sand bass. remains, ophiuroids, and brachyuran crabs dominated the diet of spott
. Bulletin. Science. SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. T 60 80 No. guts analyzed 120 Fig. 3. Randomized cumulative prey curve for all fish with gut contents analyzed in: A) fall 1992 (warm period; n = 116); and B) spring 1994 (cool period; n = 97). Mean values are plotted. Error bars represent plus or minus one standard deviation. Lack of an asymptote on either graph is an indication of the diversity of diet within these larger groups, and the need to analyze diet within smaller functional groups of spotted sand bass. remains, ophiuroids, and brachyuran crabs dominated the diet of spotted sand bass collected in fall 1992 (warm period; Fig. 5a, Appendix A). Crustaceans alone, however, dominated the diet of spotted sand bass collected in spring 1994 (cool period; Fig. 6a, Appendix B); making up >90% of the diet (by %IRI) for all fish groups except the smallest size class. This was due to an overwhelming abundance of mysid prey present in 1994 that were not found in fish collected in 1992. Molluscs were much less important than crustaceans as prey in both sampling periods collected; always contributing <10% to the diet (by %IRI) of any fish group. Annelids and other worms, as well as algae, coral, and terrestrial plant material were rare food items, generally <1% of the diet for any group of fishes. Diet was richer in number of species for most size classes, and more diverse in 1992 (Table 2). Diet in 1994 was lower in prey evenness and higher in index of specialization and prey dominance, indicating that one (mysids) or a few items had a large impact on the diet in 1994. Within sampling periods diet shifts were evident among size classes. Small, medium, and large spotted sand bass consumed prey items in distinctly different proportions in 1992. Small spotted sand bass consumed fish and brachyuran crabs (both 26% of diet by %IRI) more often than ophiuroids and molluscs, which were proportionately similar, while annelids were absent altogether (Fig. 5b).
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