. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 448 F. I. TSUJI AND E. HILL 20 JO 10 20 30 10 20 30 10 20 3O 10 20 X 10 ' I Ill I I I lil I I I III I I I I III I I I I I II I I I I I I I I I I I I III. 1982 FIGURE 3. Plot of the number of Odontosyllis appearing, high and low water tide predictions for San Diego, surface water temperature, and phases of the moon against dates of observation, June- November, 1982. Solid line represents normal probability curves for each activity period calculated from total counts taken each evening. The values given above each peak represe

. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 448 F. I. TSUJI AND E. HILL 20 JO 10 20 30 10 20 30 10 20 3O 10 20 X 10 ' I Ill I I I lil I I I III I I I I III I I I I I II I I I I I I I I I I I I III. 1982 FIGURE 3. Plot of the number of Odontosyllis appearing, high and low water tide predictions for San Diego, surface water temperature, and phases of the moon against dates of observation, June- November, 1982. Solid line represents normal probability curves for each activity period calculated from total counts taken each evening. The values given above each peak represe Stock Photo
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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 448 F. I. TSUJI AND E. HILL 20 JO 10 20 30 10 20 30 10 20 3O 10 20 X 10 ' I Ill I I I lil I I I III I I I I III I I I I I II I I I I I I I I I I I I III. 1982 FIGURE 3. Plot of the number of Odontosyllis appearing, high and low water tide predictions for San Diego, surface water temperature, and phases of the moon against dates of observation, June- November, 1982. Solid line represents normal probability curves for each activity period calculated from total counts taken each evening. The values given above each peak represent the calculated mean date of peak abundance of the worms and standard deviation. The percentage of total worms (43, 983), ap- pearing in each activity period peaks, was as follows: 28 June-2 July, 0.53; 10-18 July, 5.11; 23-31 July, 16.76; 3-15 August, 40.87; 22-30 August, 9.06; 4-14 September, 8.41; 22-28 September, 3.82; 6-12 October, 12.71; and 20-26 October, 2.73. (Markert et ai, 1961; Erdman, 1965) suggests that regardless of proximate factors, the behavior of the worms in Mission Bay is an adaptation to tidal conditions which recur at fortnightly intervals. In this connection, we note that during neap tides, there is minimal tidal flushing of an enclosed embayment, meaning that the progeny of spawning worms are able to complete their early larval development in near proximity to the adult habitat. ACKNOWLEDGMENTS We are greatly indebted to the following individuals: Dr. Kristian Fauchald, Smithsonian Institution, for identifying O. phosphorea; Dr. Terrance E. Meyer, University of Arizona, for assisting with some of the worm counts; and Dr. James T. Enright of our Division, S.I.O., for critically reading the manuscript. This work was supported in part by research grants PCM79-21658 and PCM82-15773 from the National Science Foundation. LITERATURE CITED ALDER, H. L., AND E. B. ROESSLER. 1968. Introduction to Probability and Statistics. W. H. Freeman and Company, San Francis

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