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首页> 外文期刊>Estuarine Coastal and Shelf Science >Dependence of RNA:DNA ratios and Fulton's K condition indices on environmental characteristics of plaice and dab nursery grounds
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Dependence of RNA:DNA ratios and Fulton's K condition indices on environmental characteristics of plaice and dab nursery grounds

机译：RNA：DNA比值和富尔顿K条件指数对和轻度育苗场环境特征的依赖性

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摘要

This field study showed a lack of a correlation between a morphometric (Fulton's if) and biochemical (RNA:DNA ratio) condition index in juvenile plaice (Pleuronectes platessa) and dab (Limanda limanda) studied to assess habitat quality in four sandy beach nursery grounds in Galway Bay, Ireland. Based on monthly surveys from June to September in 2008 and 2009, fish growth, indicated by RNA:DNA ratios and Fulton's if, displayed considerable spatio-temporal variability. Site-related patterns in Fulton's if for plaice and dab were consistent between years whereas RNA:DNA ratios displayed annual and interspecific variability among nursery habitats. This indicates a higher sensitivity of RNA:DNA ratios to short-term environmental fluctuations which is not apparent in Fulton's if measurements of juvenile flatfish. Generalized Additive Modelling (GAM) revealed non-linear relationships between the condition indices and (biotic and abiotic) habitat characteristics as well as diet features, derived from gut content analyses. Density of predators, sediment grain size and salinity were the most important predictors of both condition indices. Temperature also affected condition indices in dab whereas plaice condition indices varied with depth. Diet features did not contribute to the explained variability in the models predicting RNA:DNA ratios whereas certain prey groups significantly improved the explained variability in the models predicting Fulton's if of plaice and dab. The value of both indices for assessing fish condition and habitat quality in field studies is discussed. These findings aid understanding of the biological and physical mechanisms promoting fast growth and high survival which will help to identify high quality nursery areas for juvenile plaice and dab.
机译：这项现场研究表明，研究用来评估四个沙滩苗圃场的生境质量的少年（Pleuronectes platesa）和dab（Limanda limanda）的形态计量学（Fulton's if）与生化指标（RNA：DNA比）之间缺乏相关性。在爱尔兰的戈尔韦湾。根据2008年和2009年6月至9月的每月调查，以RNA：DNA比率和Fulton's if表示的鱼类生长显示出相当大的时空变异性。富尔顿的if和da中的位点相关模式在数年之间是一致的，而RNA：DNA比率显示了苗圃生境之间的年度和种间变异性。这表明RNA：DNA比值对短期环境波动具有更高的敏感性，这在富尔顿氏幼鱼的测量中并不明显。广义加性建模（GAM）显示了条件指数与（生物和非生物）栖息地特征以及饮食特征之间的非线性关系，这些关系是通过肠道含量分析得出的。捕食者的密度，沉积物粒度和盐度是这两个条件指标的最重要预测因子。温度也影响了DAB中的状况指标，而的状况指标随深度而变化。饮食特征对预测RNA：DNA比率的模型中的解释变异性无贡献，而某些猎物群体在预测Fulton's和轻咬的模型中显着改善了解释变异性。讨论了在实地研究中评估鱼类状况和栖息地质量的两个指数的价值。这些发现有助于理解促进快速生长和高存活率的生物学和物理机制，这将有助于确定高品质的苗圃和幼仔育苗区。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2012年第10期|p.60-70|共11页
  • 作者

    F. De Raedemaecker; D. Brophy; I. OConnor; B. ONeill;

  • 作者单位

    Marine and Freshwater Research Centre, Department of Life and Physical Science, Calway-Mayo Institute of Technology, Dublin Road, Calway, Ireland;

    Marine and Freshwater Research Centre, Department of Life and Physical Science, Calway-Mayo Institute of Technology, Dublin Road, Calway, Ireland;

    Marine and Freshwater Research Centre, Department of Life and Physical Science, Calway-Mayo Institute of Technology, Dublin Road, Calway, Ireland;

    Marine and Freshwater Research Centre, Department of Life and Physical Science, Calway-Mayo Institute of Technology, Dublin Road, Calway, Ireland;

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  • 正文语种 eng
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  • 关键词

    habitat quality; condition indices; juvenile flatfish; pleuronectes platessa; limanda limanda; ireland; calway bay;

    机译：生境质量;条件指标;少年比目鱼;胸膜ect利曼达利曼达爱尔兰;卡威湾;

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