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首页> 外文期刊>Marine ecology progress series >Nutrient load and epiphytes are drivers of increased herbivory in seagrass communities
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Nutrient load and epiphytes are drivers of increased herbivory in seagrass communities

机译：营养负荷和附生植物是海草群落中草食性增加的驱动力

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Eutrophication is one of the major threats facing seagrasses, promoting effects in different compartments of the community (e.g. plants, epiphytes, fauna). In this study, we researched how in situ nutrient enrichment modified the consumption rates of Cymodocea nodosa plants during a period of 3 mo, by creating a set of mesocosm feeding choice experiments with the generalist herbivore Paracentrotus lividus. Nutrient enrichment intensified the consumption of C. nodosa leaves by increasing the palatability of their tissues at different levels. At a first level (i.e. the individual plant response), nutritional quality of the tissues increased (i.e. nitrogen content), while both biomechanical (i.e. absolute force-to-tear, FTA, and specific force-to-tear, FTS) and mechanical (i.e. fiber content) traits were reduced. At a second level, the presence of epiphytes coating the leaves increased their nutritional quality without actually increasing their biomechanical resistance, which rendered higher consumption rates. However, the presence of Ulva sp. (a highly palatable macrophyte) reduced the direct consumption of C. nodosa leaves, mainly when coated by epiphytes, a fact fully endorsed by the compensatory feeding theory. Therefore, the nutritional quality of the C. nodosa leaves is a key factor regulating their susceptibility to be consumed, although mechanical and biomechanical factors also gained importance when nutritional quality was low. In addition, the presence of other components of the community (epiphytes and macroalgae) may increase or reduce herbivore pressure, highlighting the complex nature of herbivore-plant interrelationships.
机译：富营养化是海草面临的主要威胁之一，它在社区的不同区域（例如植物，附生植物，动物区系）促进影响。在这项研究中，我们研究了通配草食性食草动物Paracentrotus lividus的一组中观饲喂选择实验，从而研究了原位养分富集如何在3个月内改变No. Cycydocea nodosa植物的消耗率。营养成分的增加通过增加不同水平组织的适口性而增加了结节菜叶片的消耗。在第一级（即个体植物反应），组织的营养质量提高（即氮含量），而生物力学（即绝对撕裂力（FTA）和比撕裂力（FTS））和机械（即纤维含量）性状降低。在第二水平上，附生植物覆盖在叶片上可以提高其营养质量，而实际上却不增加其生物力学抗性，从而提高了食用率。但是，Ulva sp。的存在。 （一种高度可口的大型植物）减少了结节藻叶片的直接食用，主要是被附生植物包被时，这一事实得到了补食理论的充分认可。因此，尽管机械和生物力学因素在营养质量低下时也变得很重要，但结节梭子叶的营养质量是调节其易感性的关键因素。此外，群落其他组成部分（附生植物和大型藻类）的存在可能会增加或降低草食动物的压力，这突出了草食动物与植物之间相互关系的复杂性。

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