Estado actual de las poblaciones del erizo diadema antillarum phillippi (Echinoidea: Diadematidae) en el Parque Nacional Tayrona y Playa Blanca, Santa Marta, Caribe colombiano
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Date
2011
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Status of the populations of the black sea urchin Diadema antillarum Philippi (Echinoidea:Abstract
Diadema antillarum sufrió un evento de mortandad masiva entre 1983-1984 que redujo en un 93 % sus densidades, fenómeno que conllevó a un dominio de macroalgas en muchos arrecifes. Para conocer el estado de las poblaciones del erizo se realizó este estudio en el Parque Nacional Natural Tayrona (PNNT) y en Playa Blanca (bahía de Gaira). En cada sitio se ubicaron cinco líneas de transectos de 10 m y en cada uno se estimó la densidad por medio de cuadrantes de 1 m2 y se registró mediante video la composición de la comunidad y la rugosidad. La estructura de talla se calculó colectando entre 31 y 52 individuos y midiendo el diámetro y altura de la testa. La mayor densidad promedio se encontró en Nenguange (1.16 ind/m2) y la menor en Chengue (0.04 ind/m2), ambas localizadas en el PNNT. El diámetro promedio de la testa estuvo entre 58.84 y 80.60 mm. No se encontró ninguna relación entre los principales componentes de los arrecifes (corales, macroalgas y coral muerto), ni entre la diversidad y la uniformidad con respecto a las densidades del erizo. Los resultados indican que las densidades están en el ámbito actual registrado en otras regiones del Caribe, e indican una lenta recuperación de las poblaciones.Status of the populations of the black sea urchin Diadema antillarum Philippi (Echinoidea: Diadematidae) at Tayrona National Natural Park and Playa Blanca, Santa Marta, Colombian Caribbean. Diadema antillarum experienced a mass mortality event between 1983-1984 that dropped its densities about 93 %, a phenomenon that led to a macroalgae dominance in most reefs. This study was performed in Tayrona National Natural Park (PNNT) and Playa Blanca (Bahía de Gaira) to determine the status of the black sea urchin populations. At each site, five 10 m line transects were located perpendicular to each other and the density was estimated by 1 m2 squares; coral community composition and roughness was recorded by video. Size structure was calculated by collecting between 31 and 52 individuals and measuring the diameter and height of the test. The highest mean density was found in Nenguange (1.16 ind/m2) and lowest in Chengue (0.04 ind/m2), both located in the PNNT. Mean test diameter was between 58.84 and 80.60 mm. No relation was found between the main reef components (corals, macroalgae or dead coral) and the sea urchin densities, neither between diversity and uniformity and sea urchin densities. Our results show that the density is in the range of current abundance reported in other Caribbean regions, indicating a slow recovery of populations.
Journal
Boletín de investigaciones marinas y costerasVolume
40Issue/Article Nr
2Publisher or University
INVEMAR, Santa Marta (Colombia)Resource/Dataset Location
http://www.invemar.org.co/boletin/ArticulosR.jsp?idVol=109&idRev=1Collections
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