. Elements of ecology. Ecology. 406 The Community found in situations in which the chmatic or edaphic conditions appear to change only slowly. Such a result occurs when alterations in the environment favor the survival of a new controlling^ species; it is seen particularly among stands of rooted land plants but is also apparent in the zonation of sessile plants and animals in the tidal zone. Among terrestrial plants, for example, the competition for light, water, and nutrients may be so keen that, at the point in the environmental. Fig. Cabbage palm hauunocks in the everglades of central
. Elements of ecology. Ecology. 406 The Community found in situations in which the chmatic or edaphic conditions appear to change only slowly. Such a result occurs when alterations in the environment favor the survival of a new controlling^ species; it is seen particularly among stands of rooted land plants but is also apparent in the zonation of sessile plants and animals in the tidal zone. Among terrestrial plants, for example, the competition for light, water, and nutrients may be so keen that, at the point in the environmental. Fig. Cabbage palm hauunocks in the everglades of central Florida sharply delineated from the surrounding sawgrass. The sawgrass community is abruptly separated from the water community by a narrow ecotone in wliich a red man- grove is developing. gradient at which the conditions favor a different dominant species, the new species will take over completely, choking out the first species and producing a rather distinct line between the areas dominated by the two species. In approaching a pond in an oak forest, for example, the trees often give way rather abruptly to a zone of high shrubs. Beyond this zone are clearly marked zones of low shrubs, sedges, or grasses, and the last of these gives place to the reeds and other emer- gent plants at the pond margin. This distinct zonation exists in spite of the fact that a quite imiform gradation in soil moisture may be found from the dry ground on which the oaks stand to the completely saturated soil near the water's edge. An instance of the zonation of dominant plants around a shallow pool near the seashore is shown in Fig. 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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