. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. B. FIGURE 8. Tracks of male gametes approaching female gametes or artificial attractant sources. A: A male gamete of Ectocarpus siliculnsus in contact with cover-slip (below), and in vicinity of female gamete (above). Broad sections of tracks indicate phases with bent hind flagellum. From Geller and Miiller (1981). B: Tracks of several freshly released spermatozoids from 4 male plants of Laminaria digitata (corners) approaching a spherosil particle containing lamoxirene (center). From Maier (1984). C: Tracks of Fucus spirali
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. B. FIGURE 8. Tracks of male gametes approaching female gametes or artificial attractant sources. A: A male gamete of Ectocarpus siliculnsus in contact with cover-slip (below), and in vicinity of female gamete (above). Broad sections of tracks indicate phases with bent hind flagellum. From Geller and Miiller (1981). B: Tracks of several freshly released spermatozoids from 4 male plants of Laminaria digitata (corners) approaching a spherosil particle containing lamoxirene (center). From Maier (1984). C: Tracks of Fucus spiralis spermatozoids in the vicinity of a drop of FC-72 containing 10 5 molar fucoserratene. Time intervals between steps s. Scale units in ^m. Derived from video recordings. source (Fig. 8). It indicates that passage through a critical concentration level induces a phobic reaction resulting in the cell's return to the source. In Fucus such movements occur in the free medium without contact with a solid substratum. Theoretically, this phobic reaction could account for trapping all spermatozoids that enter the egg's vicinity by random movement. However, a detailed analysis has not been carried out, and flagellar beat patterns are not known. The comparably long hind flagellum in Fucus (Manton and Clarke 1956; Fig. 9) as well as in Ascophyllum, Pelvetia, Pelvetiopsis and Hesperophycus (Henry, pers. comm.) creates hydrodynamic conditions that are significantly different from the situation in Ectocarpus 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Mari
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