. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DISPERSAL AND GENETIC EXCHANGE 301 port from the South American to the West African coast (vide Scheltema, 1968). The first distributional pattern is restricted to forms which have eurythermal larvae; otherwise they would not survive the low temperatures of the North At- lantic Drift in which they regularly occur (see 21° C isotherm. Fig. 4). Veligers along the entire periphery of the North Atlantic gyre theoretically can be carried between any two points along its edge. The only limitation to the distance a. 30° FIGURE 8. G
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DISPERSAL AND GENETIC EXCHANGE 301 port from the South American to the West African coast (vide Scheltema, 1968). The first distributional pattern is restricted to forms which have eurythermal larvae; otherwise they would not survive the low temperatures of the North At- lantic Drift in which they regularly occur (see 21° C isotherm. Fig. 4). Veligers along the entire periphery of the North Atlantic gyre theoretically can be carried between any two points along its edge. The only limitation to the distance a. 30° FIGURE 8. Geographical distribution of the veliger larvae of Phalium granulatum (Born) : filled black circles = larvae of Plniliiiiii granulatum; small open circles = plankton stations where Phalium granulatum was missing from tows. Stippled areas denote geographical regions where Phalium granulatum post-larvae have been found. The eastern and western Atlantic forms are designated subspecifically as Phalium granulatum nndulatiim and Phalium granulatum granulatum, respectively (Abbott, 1968). Arrows show direction of surface currents. particular larva may be carried is the length of pelagic life in relation to current velocity. The second distributional pattern appears to be characteristic of stenothermal tropical forms, excluded from the colder northern route across the Atlantic but effectively carried eastward in the warm Equatorial Undercurrent. There may of course also be some species in which some factors other than temperature limit the geographical distribution of the 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-
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
