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Images showing different land use practices above the cave and bacterial mats within the lava caves of Terceira. (A) Above Gruta da Madre de Deus; (B) Bacterial mat within Gruta da Madre de Deus; (C) Above Gruta da Balcões; (D) Bacterial mat within Gruta da Balcões. © Kenneth Ingham. Reproduced by permission of Kenneth Ingham. Permission to reuse must be obtained from the rightsholder.
