. Advances in marine biology: volume 17. Coral fisheries. Mut B1,3 C3,5 () Pinnacle C2,5 T(60-90') B2 Pinnacle C2,5 T(25-30') A2 B1 Wide Pass ^^'^ • Japton B1 C2,5 Medren Enewelak Osp. Fig. 97. Map of Enewetak Atoll showing stations visited for Halitneda project, 1975, and their Halimeda and Tydemania species. Halimeda species: Al = incrassata, A2 = cylindracea, A3 — stuposa; Bl = opuntia, B2 = copiosa, B3 = distorta, B4 = minima; C2 = gigas, C3 — gracilis, C4 = lacunalis f. lata, C5 = m,acrophysa, C6 = taenicola; Dl = inicronesica, D2 = fragilis. TydewMtiia species: T = expedi- tionis
. Advances in marine biology: volume 17. Coral fisheries. Mut B1,3 C3,5 () Pinnacle C2,5 T(60-90') B2 Pinnacle C2,5 T(25-30') A2 B1 Wide Pass ^^'^ • Japton B1 C2,5 Medren Enewelak Osp. Fig. 97. Map of Enewetak Atoll showing stations visited for Halitneda project, 1975, and their Halimeda and Tydemania species. Halimeda species: Al = incrassata, A2 = cylindracea, A3 — stuposa; Bl = opuntia, B2 = copiosa, B3 = distorta, B4 = minima; C2 = gigas, C3 — gracilis, C4 = lacunalis f. lata, C5 = m,acrophysa, C6 = taenicola; Dl = inicronesica, D2 = fragilis. TydewMtiia species: T = expedi- tionis. (Modified from Hillis-Colinvaux, 1977.) and Harrison, 1977), it is better called the fore-reef terrace. Proceeding shoreward a spur and groove region is encountered, and breaking the surface at low tide is the algal ridge. Development of spur-groove and algal ridges vary considerably, however, and they may be absent. The spur-groove system is best developed on the windward sides of atolls; on the lee side smooth margins are the pattern (Tracy et al., 1948). The algal ridge has traditionally been called the " Lithothamnion ridge", and the component algae referred to as Lithothamneae or "nullipores". The name is a misleading one, however, brought about in. 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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