Borowitzka, MA & Larkum, AWD 1987, 'Calcification in algae: Mechanisms and the role of metabolism', Critical Reviews in Plant Sciences, vol. 6, no. 1, pp. 1-45.
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Koop, K & Larkum, AWD 1987, 'Deposition of organic material in a coral reef lagoon, One Tree Island, Great Barrier Reef', Estuarine, Coastal and Shelf Science, vol. 25, no. 1, pp. 1-9.
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Deposition of organic material was measured at four sites on One Tree Island coral reef using fixed sediment traps. Although no reliable data were obtained for the reef crest area because of problems of resuspension, mean deposition in the backreef area amounted to some 4 g organic C m-2 day-1 whereas in the lagoon it was about 1·5 g C m-2 day-1. This amounted to mean nitrogen deposition rates of 160 and 95 mg N m-2 day-1, respectively. As primary production by turf algae, the principal producers at One Tree Island, has been estimated at about 2·3 g C m-2 day-1 for the whole reef system and the weighted mean carbon deposition is estimated at 2·2 g C m-2 day-1, it is clear that the carbon produced by plants is largely retained in the system. Nitrogen deposition, on the other hand, amounted to only about 60% of that produced by turf algae and it must be assumed that much of this leached into the water during sedimentation. Losses of nitrogen may be minimized by incorporation of dissolved nitrogen by pelagic microheterotrophs which may in turn be consumed by filter feeders before they leave the reef. © 1987.
Larkum, AWD, Cox, GC, Hiller, RG, Parry, DL & Dibbayawan, TP 1987, 'Filamentous cyanophytes containing phycourobilin and in symbiosis with sponges and an ascidian of coral reefs', Marine Biology, vol. 95, no. 1, pp. 1-13.
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A study was made of the ultrastructure and pigment composition of filamentous cyanophytes living in symbiosis with several sponges and a colonial didemnid ascidian collected from the southern end of the Great Barrier Reef, Australia, between 1983 and 1986. The sponges were Dysidea herbacea Keller and several other encrusting sponges which have not been identified; the ascidian was Trididemnum miniatum Kott (1977). The cyanophyte Oscillatoria spongeliae (Shultz) Hauck was identified as the symbiont of several of the sponges, including D. herbacea. Two other unidentified Oscillatoria species were found in a bristly papillate sponge and in T. miniatum. Chlorophyll a, alone, was present in all the symbionts with the exception of T. miniatum, which contained the cosymbiont Prochloron and where chlorophyll b was also present. Two phycoerythrins were isolated by chromatography and chromatofocusing. Both resembled C-phycoerythrin, but one of the two carried the chromophore phycourobilin as well as phycoerythrobilin possibly on both the α and β subunits, which had apparent molecular masses of 18 and 20 kdaltons. No γ subunit was present. Ultrastructurally, the three Oscillatoria species were distinguished by an unusual type of parallel, longitudinal, thylakoid organisation; the arrangement was different in detail in each species. © 1987 Springer-Verlag.
