In May 1971, an ornithological census was taken, and samples of soil and marine invertebrates collected, on St. Paul's Rocks-an isolated group of small islands in the equatorial Atlantic Ocean. Fish were caught nearby. Crabs (Crapsusgrapsus) were abundant on the Rocks and rock pools contained anthozoa, polychaetes, crustacea and gastropods-a marine invertebrate fauna apparently closely related to that of Brazil. Specimens of four species of fish were obtained including one of Holocenmtm sanctipauli, a species endemic to the Rocks.Protozoa, nematodes, bdelloid rotifen and cuticles of cryptostigmatid mites were found in the soil; most of the species identified were microbial feeders with a cosmopolitan distribution. The only terrestrial flora observed were green and blue-green algae and a nematode-predacious fungus, continuous sea-spray upon the Rocks preventing the growth of higher plants. Breeding populations of brown boobies and black and brown noddies were observed and counted. The presence of all life-cycle stages of the booby suggested that its.breeding is seasonal.
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