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  • The exposed reef flat at Heron Island, Great Barrier Reef, Australia during low tide. The corals here are dominated by Acropora spp. and other members of family Acroporidae. Heron Island in the background.
    18557.jpg
  • The exposed outer reef flat at Heron Island, Great Barrier Reef, Australia during low tide. The corals here are dominated by Acropora spp. and other members of family Acroporidae.
    18569.jpg
  • The exposed reef flat at Heron Island, Great Barrier Reef, Australia during low tide. The corals here are dominated by Acropora spp. and other members of family Acroporidae. Heron Island in the background.
    18563.jpg
  • Acropora spp. growing densly on the shallow reef flat of Heron Island, Great Barrier Reef, Australia.
    5040.jpg
  • Social feeding groups of the "Powder Blue Tang", Acanthurus leucosternon, on a shallow reef flat in the Maldives.
    2908.jpg
  • Reef flat with dense growth of coral on the island of nananu-I-Ra (Mokusigas), Viti Levu, Fiji.
    18551.jpg
  • Reef flat with dense growth of coral on the island of nananu-I-Ra (Mokusigas), Viti Levu, Fiji.
    18584.jpg
  • Reef flat with dense growth of coral on the island of nananu-I-Ra (Mokusigas), Viti Levu, Fiji.
    18324.jpg
  • Reef flat with dense growth of coral on the island of nananu-I-Ra (Mokusigas), Viti Levu, Fiji.
    18585.jpg
  • Reef flat with dense growth of coral on the island of nananu-I-Ra (Mokusigas), Viti Levu, Fiji.
    18552.jpg
  • The exposed reef flat off the island of Siladen (Bunaken NP), North Sulawesi, Indonesia.
    18581.jpg
  • Reef flat with dense growth of coral on the island of nananu-I-Ra (Mokusigas), Viti Levu, Fiji.
    18283.jpg
  • Reef flat with dense growth of coral on the island of nananu-I-Ra (Mokusigas), Viti Levu, Fiji.
    18317.jpg
  • Section of the shallow (1-2 m depth) fringing reef at the island of Kuruimba, the Maldives back in 1980 when the reef here was totally unspoiled and showed an abundant growth of various corals.
    18104.jpg
  • Fringing reefs on the "Coral Coast" on the southern side of Viti Levu, Fiji.
    18520.jpg
  • Porites sp. forming a microatoll at Green Island, GBR, Australia.
    80112.jpg
  • Dense and impressive growth of Porites cylindrica (branching, yellow in the foreground) with Acropora sp. and Merulina sp. in the background. Photo from Bunaken, Indonesia.
    5398.jpg
  • Dive boats and big catamarans bring tourists to Hardy Reef off Whitsunday island for skin- and SCUBA-diving on the feef flat.  The boats are anchored in the channel between Hardy- and Hook Reef.
    18068-D.jpg
  • Stony corals, mostly Acropora spp., growing at a shallow reef flat in Fiji.
    80210.jpg
  • Shows how living stony corals (Acropora spp.) grow on top of dead, erroded colonies (transformied into calcareous rocks). Photo from the shallow reef flat of Kurumba Island, the Maldives.
    18591.jpg
  • Dense and spectacular coral growth on the outer reef flat of Bunaken, Nortth Sulawesi, Indonesia.
    18498.jpg
  • Reef structures, live corals (brown), shallow sand flats (light green) and deeper sand flatss (blue) in Hardy Reef, central Great Barrier Reef section.
    18060-D.jpg
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Alf J. Nilsen Natural History images

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