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Circulation Within Bahia Vizcaino, Baja California, and its Effects on Marine Vegetation

E. Yale Dawson
American Journal of Botany
Vol. 39, No. 7 (Jul., 1952), pp. 425-432
Stable URL: http://www.jstor.org/stable/2438325
Page Count: 8
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Circulation Within Bahia Vizcaino, Baja California, and its Effects on Marine Vegetation
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Abstract

Temperature conditions along the coastal margin of the clockwise eddy within Bahia Vizcaino are so varied that distinctive and dissimilar intertidal marine floras occur in close proximity. Upwelling in the vicinity of Punta Maria supports a cold-water flora, while intense insolation and reduced mixing provide for a tropical flora 10-19 mi. west of Punta Malarrimo. Upwelling along Bahia Sur permits a flora rich in cool-water species to occur, and contributes cold water to the warm Bahia Vizcaino eddy along the east side of the island. Because of tidal currents the flora of Punta San Eugenio is alternately washed by cooler upwelled water and by warmer bay water, but the influence of the former is greater. At depths of 50-100 ft. for a distance of 21 mi. east of Punta San Eugenio, a cold bottom current provides conditions favorable to the growth of northern kelps whereas a tropical flora occurs intertidally.

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