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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Remote underwater video reveals grazing preferences and drift export in multispecies seagrass beds
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Remote underwater video reveals grazing preferences and drift export in multispecies seagrass beds

机译：远程水下录像揭示了多种海草床中的放牧偏好和漂移出口

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The leaf tethering method has frequently been applied in the quantification of herbivory in seagrass beds. The major limitation of this method is the inability to differentiate between biomass that is consumed versus exported as drift particularly from thin-leaved seagrass species, due to leaf damage caused by grazers. The loss of leaf biomass to herbivory and the export of four tropical seagrass species (Thalassia hemprichii (TH), Cymodocea rotundata (CR), Cymodocea serrulata (CS), and Halodule uninervis (HU)) by drift were quantified using the tethering method with remote underwater video (RUV) in multispecies seagrass beds at Dongsha Island in the South China Sea. The diversity of grazers, and the forage preferences for each of the four seagrass species were also recorded. Most seagrass herbivory (>75%) was due to parrotfish (Leptoscarus vaigiensis and Calotomus spinidens); both juvenile and adult parrotfish preferred the fast-growing HU, but adult parrotfish apparently fed more on the more nutrient-rich TH and CS than the juveniles. The thin-leaved HU had higher relative biomass loss to grazing (74%) and drifting (13%) per day than the other species. Collectively our estimates suggest that 16% and 2% of daily production of local seagrass beds were lost due to grazing and drift export, respectively. Compared to the total loss of biomass due to grazing, the total loss due to drifting biomass was minor. (C) 2015 Elsevier B.V. All rights reserved.
机译：叶系留方法经常用于海草床中草食动物的定量。该方法的主要局限性在于，由于放牧者引起的叶片损伤，无法区分由于漂移而消耗的生物量和出口的生物量，特别是薄叶海草物种。使用束缚方法，通过漂移定量分析了叶片生物量对草食动物的损失以及四种热带海草物种（Thalassia hemprichii（TH），Cymodocea rotundata（CR），Cymodocea serrulata（CS）和Halodule uninervis（HU））的出口。南海东沙岛多物种海草床上的远程水下视频（RUV）。还记录了放牧者的多样性以及四种海草物种中每一种的草料偏好。大多数海草食草（> 75％）是由于鹦鹉鱼（Leptoscarus vaigiensis和Calotomus spinidens）引起的。幼年和成年鹦嘴鱼都偏爱快速生长的HU，但成年鹦嘴鱼显然比幼鱼更多地摄入了营养丰富的TH和CS。与其他物种相比，薄叶HU每天的相对生物量流失（74％）和漂移（13％）更高。总体而言，我们的估计表明，由于放牧和漂流出口，当地海草床日产量分别损失了16％和2％。与放牧造成的生物量损失相比，生物量漂移造成的损失总量较小。 （C）2015 Elsevier B.V.保留所有权利。

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