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首页> 外文期刊>Estuarine Coastal and Shelf Science >Epiphyte presence and seagrass species identity influence rates of herbivory in Mediterranean seagrass meadows
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Epiphyte presence and seagrass species identity influence rates of herbivory in Mediterranean seagrass meadows

机译：附生植物的存在和海草种类的同一性对地中海海草草甸草食性的影响

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Herbivory on Mediterranean seagrass species is generally low compared to consumption of some other temperate and tropical species of seagrasses. In this study we: (1) investigate the feeding preference of the two dominant Mediterranean seagrass herbivores, the sea urchin Paracentrotus lividus and the fish Sarpa salpa, on Posidonia oceanica and Cymodocea nodosa and (2) elucidate the role of epiphytes in herbivore choices. We assessed consumption rates by tethering seagrass shoots, and preferences by food choice experiments with the following paired combinations: 1) Epiphytized leaves of both C nodosa vs. P. oceanica (CE vs PE); 2) Non-epiphytized leaves of C nodosa vs. P. oceanica (CNE vs. PNE); 3) Epiphytized vs non-epiphytized leaves of C nodosa (CE vs. CNE) and 4) Epiphytized vs non-epiphytized leaves of P. oceanica (PE vs PNE). We found that preference for C nodosa was weak for S. salpa, but strong for P. lividus, the species responsible for most consumption at our study. Overall both herbivores showed preference for epiphytized leaves. The higher nutritional quality of C nodosa leaves and epiphytes together with the high coverage and diversity of the epiphyte community found on its leaves help explain the higher levels of herbivory recorded on epiphyted leaves of C nodosa. Other factors such as seagrass accessibility, herbivore mobility and size, and behavioral responses to predation risks, may also affect the intensity of seagrass herbivory, and studies addressing the interactions with these factors are needed to improve our understanding of the nature, extent and implications of herbivory in coastal ecosystems. (C) 2015 Elsevier Ltd. All rights reserved.
机译：与食用其他一些温带和热带海草种类相比，地中海海草种类的草食动物通常较低。在这项研究中，我们：（1）研究两种主要的地中海海草食草动物（海胆Paracentrotus lividus和鱼Sarpa salpa）在大洋波塞冬和夜蛾身上的摄食偏好，以及（2）阐明附生植物在食草动物选择中的作用。我们通过束缚海草芽来评估食用率，并通过以下配对组合通过食物选择实验来评估其消费偏好：1）结节菜与大洋参的附生叶（CE与PE）； 2）结节菜对大洋假球藻的非表生叶（CNE对PNE）； 3）结节藻的附生叶与未附生叶（CE与CNE）和4）大洋雪茄的附生叶与未附生叶（PE与PNE）。我们发现，对结节菜的偏爱对S. salpa较弱，但对P. lividus则较强烈，P。lividus是我们研究中负责大多数消费的物种。总体而言，两种草食动物都对附生叶表现出偏爱。结节菜叶子和附生植物的较高营养品质，以及在其叶子上发现的附生植物群落的高覆盖度和多样性，有助于解释结节菜的附生叶子上记录的食草水平较高。其他因素，例如海草的可及性，草食动物的活动性和大小以及对捕食风险的行为反应，也可能影响海草的食草性强度，需要研究解决与这些因素相互作用的方法，以增进我们对海草的性质，程度和影响的理解。沿海生态系统中的食草动物。 （C）2015 Elsevier Ltd.保留所有权利。

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