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首页> 外文期刊>Marine ecology progress series >Nutrient status, plant availability and seasonal forcing mediate fish herbivory in temperate seagrass beds
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Nutrient status, plant availability and seasonal forcing mediate fish herbivory in temperate seagrass beds

机译：温带海草床中的营养状况，植物可获得性和季节性强迫介导鱼类食草

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Among mechanisms for herbivore choice, palatability and abundance of food resources appear to have a central role in foraging ecology. Hence, nutrient supply due to eutrophication may cause profound alterations to both nutritional and quantitative aspects of primary producers, leading to changes in herbivory pressure and enhancing overall functional changes. We present an experiment of water column enrichment in an oligotrophic seagrass bed of Posidonia oceanica (northwestern Mediterranean Sea). In this study we measured monthly seasonal changes in fish herbivore behavior following alterations in qualitative (nutrient content, species composition) and quantitative (biomass availability) features of primary producers (seagrass, epiphytes and macroalgae) as a result of nutrient fertilization. Nutrient addition induced changes in both seagrass (enhanced plant N content and leaf growth) and epiphytes (enhanced N content, biomass load and altered species composition) throughout late spring and summer. This nutritional alteration of food organoleptic properties concurred within the seasonal peak of herbivory by the fish Sarpa salpa and caused a disproportionate herbivore pressure on enriched plots, until shoots were reduced to around 50% of their original leaf area. When plant biomass on fertilized plots was substantially reduced, herbivores fed mostly on control plots until the end of the summer period. During the rest of the year (autumn and winter), moderate nutrient additions could not disrupt the seasonal inertia of the ecosystem. Hence, our results show evidence that the foraging behavior of herbivorous fish is the result of chemical and visual sensing of the environment. Seasonal forcing, however, tightly controls ecosystem processes and the biological cycles of species, adding a further step to functional alterations in temperate seagrass meadows subjected to eutrophication.
机译：在食草动物选择的机制中，适口性和丰富的食物资源似乎在觅食生态中具有重要作用。因此，富营养化导致的营养供应可能导致初级生产者的营养和数量方面发生深刻变化，从而导致食草压力发生变化并增强总体功能变化。我们提出了在Posidonia oceanica（西北地中海）的贫营养海草床上进行水柱富集的实验。在这项研究中，我们测量了由于养分施肥导致的初级生产者（海草，附生植物和大型藻类）的定性（营养成分，物种组成）和定量（生物量可利用性）特征发生变化后，鱼类草食动物行为的每月季节性变化。在春季和夏季后期，营养添加会引起海草（增强的植物N含量和叶片生长）和附生植物（增强的N含量，生物量负荷和物种组成变化）的变化。食物的感官特性的这种营养变化发生在萨尔帕鱼（Sarpa salpa）食草的季节性高峰内，并在富集地块上造成了不成比例的食草动物压力，直到幼芽减少到其原始叶面积的50％左右。当施肥地上的植物生物量大大减少时，食草动物主要在对照地上觅食，直到夏末。在一年的其余时间（秋季和冬季），适量的营养添加不会破坏生态系统的季节性惯性。因此，我们的结果表明，食草鱼的觅食行为是环境化学和视觉感知的结果。然而，季节性强迫严格控制了生态系统过程和物种的生物周期，为遭受富营养化的温带海草草甸的功能变化增加了进一步的步骤。

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