. Coastal awareness : a resource guide for teachers in elementary science / prepared by Frederick A. Rasmussen. Seashore the upper level of tidal influence, where tidal inundations occur only a few times a year. Between these two extremes, plants and animals thrive according to the range of conditions they can tolerate — conditions that are dominated by the tides < the lower levels—and almost independent of them at the upper levels. Some factors of crucial importance to the survival, growth, and re- production of organisms in the intertidal zone are the intensity and frequency of
. Coastal awareness : a resource guide for teachers in elementary science / prepared by Frederick A. Rasmussen. Seashore the upper level of tidal influence, where tidal inundations occur only a few times a year. Between these two extremes, plants and animals thrive according to the range of conditions they can tolerate — conditions that are dominated by the tides < the lower levels—and almost independent of them at the upper levels. Some factors of crucial importance to the survival, growth, and re- production of organisms in the intertidal zone are the intensity and frequency of mechanical disturbance due to tidal movement; the vertical range over which the tide operates, which determines flooding depths and the vertical extent of the marsh; the form of the tidal cycle, which determines both the frequency and the length of submergence and emergence; and the water quality, which determines, among other things, the amount of light reaching submerged growths and the salinity to which they are subjected. Grasses are the most prominent plants in salt marshes. Cord grass in a long and a short form, is the grass most likely to live in marsh areas covered by water at high tides. Other salt-tolerant plants and plants tolerant to salt spray make up the upper edges of the marsh and vary with the locality. Bull RUSH U\GU TIDE. SALT GRASS BLACK GRASS SHORT CORT5 GRASS GRASS L0G-WO£M A TYPICAL SALT MARSH -27-. 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 Rasmussen, Frederick A. Washington, D. C. : National Oceanic and Atmospheric Administration: U. S. Dept. of Commerce
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