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首页> 外文期刊>Marine biology >Geographic covariation of chemical quality of the host alga Fucus vesiculosus with fitness of the herbivorous isopod Idotea baltica
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Geographic covariation of chemical quality of the host alga Fucus vesiculosus with fitness of the herbivorous isopod Idotea baltica

机译：寄主藻藻的化学质量与草食性等足类波多黎各的适应性之间的地理协变

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摘要

Environmental and/or genetic among-site variation in plant quality may influence growth and fecundity of specialized herbivores inhabiting a particular site. Such variation is important as it generates spatial variation in selection for traits related to plant-herbivore interaction. Littoral macroalgae are known to respond plastically to environmental variation by modifying their chemistry or morphology. We studied geographic variation in phlorotannin, nitrogen, protein, and sugar (fucose, mannitol, and melibiose) concentrations of the brown alga Fucus vesiculosus at 12 sites separated by 0.5 to 40 km in the naturally fragmented Archipelago Sea in the northern Baltic Sea. By this regional variation in algal chemistry we attempted to explain among-pop-ulation variation in size and fecundity of the crustacean herbivore Idotea baltica. We observed high spatial variation in all the measured chemical characteristics of F. vesiculosus, as well as in female size and the number of eggs produced by the herbivores. Spatial variation in nitrogen or protein contents of the alga did not explain the variation of herbivore traits. However, egg size positively covaried with spatial variation in the concentration of mannitol, the major storage carbohydrate of the alga. Such a positive relationship may arise if I. baltica can utilize the nutritive value of a mannitol-rich diet thereby being better able to provision the developing eggs with energy-rich metabolites. Unexpectedly, the concentration of phlorotannins, secondary metabolites having a putative role in defense against herbivory, positively covaried with the size of the herbivore. Among-population variation in host plant chemistry and covariation of that with herbivore growth and reproduction imply that herbivores respond to the local quality of their host plants, and that geographical structuring of populations has to be taken into account in studies of plant-herbivore interactions.
机译：植物品质的环境和/或基因位点间变异可能会影响居住在特定位点的特种食草动物的生长和繁殖力。这种变化很重要，因为它会在选择与植物-草食动物相互作用相关的性状时产生空间变化。已知沿岸大型藻类通过改变其化学或形态对环境变化具有塑性响应。我们研究了波罗的海北部自然零碎的群岛海中12个相距0.5至40 km的褐藻褐藻Fucus vesiculosus的光环丹宁，氮，蛋白质和糖（岩藻糖，甘露醇和半乳糖）浓度的地理变化。通过藻类化学的这种区域变化，我们试图解释甲壳类草食动物波多黎各的大小和繁殖力之间的种群间变化。我们观察到在所有测量到的维氏藻化学特性以及雌性大小和食草动物生产的卵的数量中，空间变化很大。藻类中氮或蛋白质含量的空间变化不能解释草食动物性状的变化。但是，卵的大小与甘露醇（藻类的主要贮藏碳水化合物）浓度的空间变化呈正相关。如果波罗的海草可以利用富含甘露醇的饮食的营养价值，从而能够更好地为发育中的鸡蛋提供富含能量的代谢产物，则可能会出现这种正相关关系。出乎意料的是，次草代谢产物phlorotannins的浓度与草食动物的大小呈正相关。寄主植物化学之间的种群差异以及与草食动物生长和繁殖的共同变异意味着草食动物对其寄主植物的当地质量有反应，并且在植物与草食动物相互作用的研究中必须考虑种群的地理结构。

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  • 来源
    《Marine biology》 |2004年第4期|p.759-768|共10页
  • 作者

    A. Hemmi; V. Jormalainen;

  • 作者单位

    Section of Ecology, Department of Biology, University of Turku, 20014 Turku, Finland;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境生物学;
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