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Two different Underwater Visual Census (UVC1 and UVC2) were performed at three sites in the Ria Formosa, using 30 meter transect belts, and compared for differences in seahorse density and holdfast availability. Each UVC differed in transect placement and total survey area coverage. The observed Hippocampus guttulatus density was significantly higher (P<0.05) using UVC2 for Site 1 and Site 2, but...
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