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首页> 外文期刊>Estuarine Coastal and Shelf Science >Population structure, density and food sources of Terebralia palustris (Potamididae: Gastropoda) in a low intertidal Avicennia marina mangrove stand (Inhaca Island, Mozambique)
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Population structure, density and food sources of Terebralia palustris (Potamididae: Gastropoda) in a low intertidal Avicennia marina mangrove stand (Inhaca Island, Mozambique)

机译：潮间带低潮的Avicennia滨海红树林林（莫桑比克Inhaca岛）上的Terebralia palustris（Potamididae：Gastropoda）的种群结构，密度和食物来源

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摘要

Population structure and distribution of Terebralia palustris were compared with the environmental parameters within microhabitats in a monospecific stand of Avicennia marina in southern Mozambique. Stable carbon and nitrogen isotope analyses of T. palustris and potential food sources (leaves, pneu-matophore epiphytes, and surface sediments) were examined to establish the feeding preferences of T. palustris. Stable isotope signatures of individuals of different size classes and from different micro-habitats were compared with local food sources. Samples of surface sediments 2.5-10 m apart showed some variation (-21.2‰ to -23.‰ in δ~(13)C, probably due to different contributions from seagrasses, microalgae and mangrove leaves, while δ~(15)N values varied between 8.7‰ and 15.8‰, indicating that there is a very high variability within a small-scale microcosm. Stable isotope signatures differed significantly between the T. palustris size classes and between individuals of the same size class, collected in different microhabitats. Results also suggested that smaller individuals feed on sediment, selecting mainly benthic microalgae, while larger individuals feed on sediment, epiphytes and mangrove leaves. Correlations were found between environmental parameters and gastropod population structure and distribution vs. the feeding preferences of individuals of different size classes and in different microhabitats. While organic content and the abundance of leaves were parameters that correlated best with the total density of gastropods (>85%), the abundance of pneumatophores and leaves, as well as grain size, correlated better with the gastropod size distribution (>65%). Young individuals (height < 3 cm) occur predominantly in microhabitats characterized by a low density of leaf litter and pneumatophores, reduced organic matter and larger grain size, these being characteristic of lower intertidal open areas that favour benthic microalgal growth. With increasing shell height, T. palustris individuals start occupying microhabitats nearer the mangrove trees characterized by large densities of pneumatophores and litter, as well as sediments of smaller grain size, leading to higher organic matter availability in the sediment.
机译：在莫桑比克南部的Avicennia滨海单种林分中，比较了Terebralia palustris的种群结构和分布与微生境内的环境参数。检验了鼠尾草的稳定碳氮同位素分析以及潜在的食物来源（叶子，气生植物附生植物和表面沉积物），以建立鼠尾草的摄食偏好。将不同规模和不同微生境的个体的稳定同位素特征与当地食物进行了比较。相隔2.5-10 m的表层沉积物样品在δ〜（13）C中显示出一些变化（-21.2‰至-23。‰），可能是由于海草，微藻和红树林叶片的贡献不同，而δ〜（15）N值在8.7‰和15.8‰之间变化，表明在一个小规模的微观世界中存在非常高的变异性，在不同的微生境中采集的帕氏锥虫大小等级之间和相同大小等级的个体之间，稳定的同位素特征差异很大。还建议较小的个体以沉积物为食，主要选择底栖微藻，而较大的个体以沉积物，附生植物和红树林叶为食，发现环境参数与腹足纲种群结构和分布与不同大小等级和不同个体的摄食偏好之间存在相关性。在不同的微生境中，有机物含量和叶片丰度是与腹足纲动物总密度最相关的参数（> 85％），肺气单胞菌和叶片的丰度以及谷粒的大小与腹足纲的大小分布（> 65％）更好地相关。年轻人（身高<3 cm）主要发生在微生境中，这些生境的特征是叶子凋落物和气垫的密度低，有机物减少和颗粒尺寸较大，这些是潮间带较低的开放区域的特征，有利于底栖微藻生长。随着壳层高度的增加，T。palustris个体开始在靠近红树林的微生境中生活，这些红树林的特点是气穴和凋落物的密度大，以及较小粒度的沉积物，导致沉积物中有机物的利用率更高。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2009年第3期|318-325|共8页
  • 作者

    Gil Penha-Lopes; Steven Bouillon; Perrine Mangion; Adriano Macia; Jose Paula;

  • 作者单位

    Centro de Oceanografia, Laboratorio Maritimo da Guia, Faculdade de Ciencias da Universidade de Lisboa, Avenida Nossa Senhora do Cabo, 939, 2750-642 Cascais, Portugal Department of Analytical and Environmental Chemistry, Vrije Universiteit Brussel, Brussels, Belgium;

    Department of Analytical and Environmental Chemistry, Vrije Universiteit Brussel, Brussels, Belgium Katholieke Universiteit Leuven, Department of Earth and Environenmental Sciences, Kasteelpark Arenberg 20, B-3001 Leuven, Belgium;

    Department of Analytical and Environmental Chemistry, Vrije Universiteit Brussel, Brussels, Belgium;

    Departamento de Ciencias Biologicas, Faculdade de Ciencias, Universidade Eduardo Mondlane, C.P. 257 Maputo, Mozambique;

    Centro de Oceanografia, Laboratorio Maritimo da Guia, Faculdade de Ciencias da Universidade de Lisboa, Avenida Nossa Senhora do Cabo, 939, 2750-642 Cascais, Portugal;

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  • 正文语种 eng
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  • 关键词

    terebralia palustris; population structure; distribution; feeding; stable isotopes; mangroves;

    机译：土星虫人口结构;分配;馈送;稳定同位素红树林;

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