. The Biological bulletin. Biology; Zoology; Marine biology. 486 THEODORA C. PAULSON AND RUDOLF S. SCHELTEMA The relative volumes consumed in each of the experiments may be computed if the cell volume for each species of alga is known. The average volume for Cyclotella may be regarded as approximately 203 }j? (Guillard and Cassie, 1963, p. 62), that of Phaeodactylum and Dunaliella as 120 fi^ and 400 fi^, respectively (Parsons et al., 1961, p. 1004). If the volume of Cyclotella cells consumed is arbitrarily given a value of one, then the relative volume for the other two algal species for each
. The Biological bulletin. Biology; Zoology; Marine biology. 486 THEODORA C. PAULSON AND RUDOLF S. SCHELTEMA The relative volumes consumed in each of the experiments may be computed if the cell volume for each species of alga is known. The average volume for Cyclotella may be regarded as approximately 203 }j? (Guillard and Cassie, 1963, p. 62), that of Phaeodactylum and Dunaliella as 120 fi^ and 400 fi^, respectively (Parsons et al., 1961, p. 1004). If the volume of Cyclotella cells consumed is arbitrarily given a value of one, then the relative volume for the other two algal species for each size range of veliger larvae may be computed from the data in Table III. These values show that although Dunaliella cells are removed from. Figure 2. Choice among three different species of algal food by veliger larvae of the gastropod Nassarius obsoletus with a shell length between 250 ju. and 400 fi. For explanation see text. suspension at a significantly slower rate, the volumes of cells removed by all veligers up to 400 ju, in length are nearly identical to that of Cyclotella. Only in larvae over 400 [x does the relative volume of Dunaliella removed become some- what less. At all ages the relative volume of Dunaliella removed by veligers seems to equal or exceed that of Phaeodactylum. DiSCUSSSION Three qualities of microorganisms in the natural environment are likely to make possible their selection as food by larvae. These are their (1) size, (2) availability or concentration, and (3) chemotactile attractiveness or ";. 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Pre
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