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首页> 外文期刊>Revista de Biología Tropical >Distribución de esponjas (Porifera) a lo largo de un gradiente de profundidad en un arrecife coralino, Parque Nacional San Esteban, Carabobo, Venezuela
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Distribución de esponjas (Porifera) a lo largo de un gradiente de profundidad en un arrecife coralino, Parque Nacional San Esteban, Carabobo, Venezuela

机译:委内瑞拉卡拉布博圣埃斯特万国家公园的珊瑚礁中海绵(Porifera)沿深度梯度的分布

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摘要

Sponges (Porifera) distribution along a depth gradient in a coral reef, Parque Nacional San Esteban, Carabobo, Venezuela. Sponges constitute one of the most diverse and abundant animal groups in the marine tropical benthos especially in coral reefs, though poorly studied to species level. The aim of this study is to characterize the sponge community along a depth gradient at Isla Larga (Parque Nacional San Esteban, Venezuela) fringe reef. Net and total sedimentation, roughness index, sponge species richness, density and proportion of the bottom covered by sponges, were evaluated at seven depths (1, 3, 6, 9, 12, 15, 18m), 17 species were identified grouped in 10 demosponges families. The highest densities and coverage corresponded to 6m of depth (6.03ind/m2; 11%), that coincides with the lowest net sedimentation and highest substrate heterogeneity. Most abundant species were Desmapsamma anchorata, Amphimedon erina and Scopalina rueztleri. Principal component analysis divided this community in three zones according to depth. The shallow zone of the reef (1 and 3m), where wave force and high irradiance exert a constant "stress sponges, shows the lowest density and coverage by sponges. In contrast, medium depth (6, 9 y 12m) and deep zone (15 y 18m) with lower light and sedimentation levels seem to enhance sponge growth and survival that are reflected on the higher densities and coverage of sponges. Rev. Biol. Trop. 58 (Suppl. 3): 175-187. Epub 2010 October 01.
机译:委内瑞拉卡拉博沃国家公园圣埃斯特万公园的珊瑚礁中海绵(Porifera)沿深度梯度分布。海绵是海洋热带底栖动物(尤其是在珊瑚礁中)中种类最多,数量最多的动物群之一,尽管对物种水平的研究不足。这项研究的目的是在拉加岛(委内瑞拉圣埃斯特万公园国家公园)边缘礁沿深度梯度表征海绵群落。在七个深度(1、3、6、9、12、15、18m)对净沉积物和总沉积物,粗糙度指数,海绵物种丰富度,海绵覆盖的密度和底部覆盖率进行了评估,确定了17种,分为10种减灾家庭。最高的密度和覆盖范围对应于6m的深度(6.03ind / m2; 11%),这与最低的净沉降和最高的基质异质性相吻合。最丰富的物种是Desmapsamma锚地,Amphimedon erina和Scopalina rueztleri。主成分分析根据深度将这个社区划分为三个区域。在波浪作用力和高辐照度施加恒定“应力海绵”的珊瑚礁浅层区域(1和3m)显示出最低的密度和海绵覆盖率。相反,中等深度(6、9 y 12m)和深层区域( Rev. Biol。Trop。58(Suppl。3):175-187。Epub 2010 October 01,在15 y 18m(15 y 18m)的光线和较低的沉积水平下似乎可以提高海绵的生长和生存能力,这反映在较高的海绵密度和覆盖率上。 。

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