Hasil (
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[Salinan]Disalin!
7.1 INTRODUCTIONTides are created by the gravitational pull of the moon and the sun and are mostfamiliar as a rise and fall in the level of the sea twice a day. This changing waterlevel leads to interesting patterns of zonation of intertidal organisms. They have been well studied over a long period and we shall not review them here. Thetides also generate currents in the water that interact with the bottom to produceturbulence. This bottom-produced turbulence tends to mix the lower layers of the water, and if the currents are sufficiently strong the turbulence may preventany stratification and a whole area may be permanently tidally mixed. It has been shown that the breeding grounds of a number of stocks of herring Clupeaharengusare each located in a different, discrete area of strong tidal mixing (Ilesand Sinclair 1982), and in this chapter we explore the possible significance of thisobservation.
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