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首页> 外文期刊>Estuarine Coastal and Shelf Science >The importance of different juvenile habitats as nursery areas for a ubiquitous estuarine-dependent marine fish species
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The importance of different juvenile habitats as nursery areas for a ubiquitous estuarine-dependent marine fish species

机译：不同少年栖息地作为无处不在河口的海洋鱼类物种育苗区的重要性

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Estuarine-dependent marine fish species rely on shallow, sheltered and food rich habitats for protection from predators, growth and ultimately recruitment to adult populations. Hence, habitats within estuaries function as critical nursery areas for a variety of fish species. Results from stomach content analysis and dietary diatom composition of a ubiquitous estuarine-dependent species Rhabdosargus holubi (Steindachner, 1881) in the main vegetated and un-vegetated habitats in the Bushmans Estuary, South Africa, were interpreted along with published information on habitat complexity, relative abundance and behaviour of this species. Although the complexity of seagrass, together with the higher abundance and behaviour of R. holubi in seagrass suggests that this is the main nursery habitat (in terms of both feeding and protection from predation), the dominance of red filamentous algae and the presence of some invertebrates mainly in the diet of fish from un-vegetated habitats indicates that this species is using a mosaic of habitats, including un-vegetated areas, for foraging. Based on the above findings, and results from other studies, it is concluded that juvenile R. holubi in permanently open estuaries makes use of a range of habitats according to macrophyte shelter from predators, the availability of preferred food resources and physical drivers such as water depth and tidal phase. This study demonstrated that a multi-method approach, as opposed to a single method approach (diet alone) is useful to assess the nursery value of juvenile fish habitats.
机译：依赖河口的海洋鱼类物种依靠浅海，庇护所和食物丰富的栖息地来保护免受捕食者，生长以及最终招募到成年种群的侵害。因此，河口内的栖息地是各种鱼类的重要育苗区。解释了南非布什曼斯河口主要植被和非植被生境中普遍存在的依赖河口的物种Rhabdosargus holubi（Steindachner，1881）的胃含量分析和饮食硅藻组成的结果，以及有关生境复杂性的公开信息，该物种的相对丰度和行为。尽管海草的复杂性，再加上海草中荷叶红景天的较高丰度和行为表明，这是主要的苗圃生境（从摄食和保护免受捕食的角度而言），红色丝状藻类占主导地位以及一些红藻的存在。无植被栖息地鱼类饮食中的无脊椎动物表明该物种正在利用包括无植被区域在内的栖息地马赛克进行觅食。根据上述发现以及其他研究的结果，得出的结论是，永久开放河口中的少年河豚（R. holubi）根据掠食者的大型植物庇护所，各种首选食物资源和诸如水等自然驱动因素，利用了一系列生境深度和潮汐阶段。这项研究表明，与单一方法（仅饮食）相比，多方法方法可用于评估幼鱼栖息地的苗圃价值。

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