. Elements of ecology. Ecology. 104 Water the tide is out. In the situation shown in Fig. the sharp upper limit for the growth of the rock weeds is easily apparent. At a higher level the longer period of air exposure and of lack of sea water im- posed a clearly defined upper boundary upon the barnacle Photo by R. W. Miner Fig. Rocky shore at low tide showing stratum of sea weeds (Laminarian Zone) and of barnacles (Balanoid Zone). Stephenson and Stephenson (1949) have found that on rocky shores in many parts of the world three fundamental zones may be recog- nized: the Lit
. Elements of ecology. Ecology. 104 Water the tide is out. In the situation shown in Fig. the sharp upper limit for the growth of the rock weeds is easily apparent. At a higher level the longer period of air exposure and of lack of sea water im- posed a clearly defined upper boundary upon the barnacle Photo by R. W. Miner Fig. Rocky shore at low tide showing stratum of sea weeds (Laminarian Zone) and of barnacles (Balanoid Zone). Stephenson and Stephenson (1949) have found that on rocky shores in many parts of the world three fundamental zones may be recog- nized: the Littorina Zone, characterized by snails; the Balanoid Zone, characterized by barnacles; and the Laminarian Zone, characterized by laminarian seaweeds. The relation of these zones to the tide marks is shown in the diagram. Littorina Zone Balanoid Zone Laminarian Zone High Spring Tide TIDAL ZONE Lojv Spring Tide. 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 Clarke, George L. (George Leonard), 1905-. New York, Wiley
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Keywords: ., bookcentury1900, bookpublishernewyorkwiley, booksubjectecology
