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Free Content Abundance and spatial distribution of Thalassoma lucasanum (Gill, 1863) in a coral reef of the Eastern Tropical Pacific

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In order to determine the spatial distribution and abundance patterns of the rainbow wrasse (Thalassoma lucasanum) across a coral reef of the eastern tropical pacific, visual censuses of fish were carried out along 10 transects in a fringing coral reef at Gorgona Island off Colombia. The abundance of initial-phase males and females (IP) and terminal-phase (TP) males at each main reef zone (Channel, Flat and Outer Slope) was computed and their quantitative distribution across the reef is described. Both phases were observed across the coral reef. The IP was significantly more abundant in the channel (57.0 ± 1.95 ind 1000 m−2; P < 0.05), than at the flat or outer slope. The highest relative abundance of TP occurred in the outer slope (4.0 ± 0.43 ind 1000 m−2); however, no significant differences were observed in the distribution of density across the reef for this phase (P > 0.05). The spatial pattern observed for T. lucasanum was not related to living coral cover or relative reef complexity. It is suggested that abundance and distribution of this species at Eastern Tropical Pacific (ETP) reef is determined by other factors like food availability or social system.

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Document Type: Research Article

Publication date: 01 January 2001

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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