. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. COLLECTIVE HOMING OF NERITA 219. ^60% 27 c. 1— •3 •4—• 0) - 20 40 -o -20 36 FIGURE 5. Homing performance relative to the crossing tests: upward (above) and diagonal (below) return, expressed as percent of snails recovered after downward (left) and oblique (right) displacement. Total numbers of displaced snails are shown above the histograms (N). Shaded histograms: snails returned to the original cluster. Among the probable factors informing the animals about their vertical shift are the variation of exposure to waves during
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. COLLECTIVE HOMING OF NERITA 219. ^60% 27 c. 1— •3 •4—• 0) - 20 40 -o -20 36 FIGURE 5. Homing performance relative to the crossing tests: upward (above) and diagonal (below) return, expressed as percent of snails recovered after downward (left) and oblique (right) displacement. Total numbers of displaced snails are shown above the histograms (N). Shaded histograms: snails returned to the original cluster. Among the probable factors informing the animals about their vertical shift are the variation of exposure to waves during high tide and physical substrate conditions (hydration and temperature) during low tide. These cues could trigger a directional orientation such as geotaxis, following the complex integration between releasing and orienting mechanisms frequently involved in the zonal orientation of intertidal gastropods (Fraenkel, 1927; Kristensen, 1965; Bock and Johnson, 1967; Bingham, 1972; Underwood, 1972a, b; Chelazzi and Focardi, 1982). However, alone this precisely tuned zonal behavior cannot guarantee the relocation of a spatially definite goal such as the aggregation area, 10-40 cm in diameter. An additional stopping effect on moving animals based on long-lasting marking of the cluster area could explain some aspects of the natural mass-homing of TV. , including the sudden occupancy of aggregation sites and their long- term spatial stability. Nonetheless, the difference in the homing performance. 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. : Marine Bi
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
