. Elements of ecology. Ecology. Transport hy Water 49 rivers and estuaries although the planktonic larvae might be expected to be carried away since the net water movement is always toward the sea (Ketchum, 1951). In some situations the denser, more saline water near the bottom tends to move predominantly into the estuary whereas the greater flow in the surface strata is seaward. Observa- tions in certain estuaries indicate that the older oyster larvae tend to drop to the bottom on the ebb tide and to rise into the water on the. Single winter egg in ephippium Redrawn from Needham and Lloyd, 19
. Elements of ecology. Ecology. Transport hy Water 49 rivers and estuaries although the planktonic larvae might be expected to be carried away since the net water movement is always toward the sea (Ketchum, 1951). In some situations the denser, more saline water near the bottom tends to move predominantly into the estuary whereas the greater flow in the surface strata is seaward. Observa- tions in certain estuaries indicate that the older oyster larvae tend to drop to the bottom on the ebb tide and to rise into the water on the. Single winter egg in ephippium Redrawn from Needham and Lloyd, 1937 Fig. Ceriodaphnia reticulata showing eggs developing in the brood pouch. flood tide (Carriker, 1951). In this manner a sufficient number of young oysters work their way upstream to repopulate the upper regions of the estuary. In barnacles the problem is solved by the fact that, although the younger larvae are found in the upper water layers, the larvae approaching the setting stage tend to concentrate at deeper levels where the net drift carries them up the estuary (Bousfield, 1954).. 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
