. Advances in marine biology: volume 17. Coral fisheries. ECOLOGY AND TAXONOMY OF Holimeda 291 rhizomes (Fig. 96), and some of the less dense may contain very sizeable populations of Halimeda, or the dense Halimeda patches may be in adjacent areas. These especially thick Thalassia stands are restricted to shallow water between — 0-5m and —3 m. Even in apparently optimum sites the distribution of the Thalassia stands is patchy, and there is evidence that the patches themselves are unstable. Most patches terminate in what could well be called a blow-out: there is an. Fig. 96. Edge of a dense sta
. Advances in marine biology: volume 17. Coral fisheries. ECOLOGY AND TAXONOMY OF Holimeda 291 rhizomes (Fig. 96), and some of the less dense may contain very sizeable populations of Halimeda, or the dense Halimeda patches may be in adjacent areas. These especially thick Thalassia stands are restricted to shallow water between — 0-5m and —3 m. Even in apparently optimum sites the distribution of the Thalassia stands is patchy, and there is evidence that the patches themselves are unstable. Most patches terminate in what could well be called a blow-out: there is an. Fig. 96. Edge of a dense stand of Thalassia testudinum, partly fringed by other sea grasses such as Diplanthera wrightii. Here the calcareous alga Penicillus capitatus, with some Udotea, is prominent towards the edge of the bed, and extends into the sand of the lower left. There is a suggestion of a rotational process of colonizing sand, consolidation of the sand by sea-grass rhizomes, development of the dense Halimeda and other populations, and physical destruction of the community. abrupt edge, with barren sand adjacent, and the discontinuity between the Thalassia community and the bare sand reveals a vertical section of the sand consolidated by the Thalassia rhizomes which in places is about 10 cm high. These observations suggest very strongly that there is a rotational process of colonizing sand, consolidation of the sand by sea grass rhizomes, development of the dense Halimeda and other alga or sea grass populations, and then physical destruction of the com- munity. The dynamics of this process are of immense importance to the total Halimeda productivity of the 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 Hillis-Colinvaux, Liewellya. London : Academic Press ; Toronto
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