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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Abundance, performance, and feeding preference of herbivorous amphipods associated with a host alga-epiphyte system
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Abundance, performance, and feeding preference of herbivorous amphipods associated with a host alga-epiphyte system

机译：与寄主藻表生植物系统相关的草食性两足动物的丰度，性能和摄食偏好

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Mesograzers can benefit their host macrophytes by selectively grazing on epiphytic algae, such as well documented for seagrass meadows and other systems where hosts seem to be less palatable than epiphytes. However, where both host and epiphytes are algae and are likely to be palatable, the predictions about the feeding preferences of mesograzers and, thus, their potential ability in controlling the epiphyte biomass are unclear. Also, the performance consequences of feeding on host algae versus epiphytes, what can explain the feeding preferences of mesograzers, have been rarely tested. The food value of the host alga Sargassum filipendula and two of its common epiphytic algae, Hypnea musczformis and Dictyota cervicornis, for mesograzers was contrasted by investigating the abundance, performance, feeding preference, and feeding rates of the herbivorous amphipods Cymadusa filosa and Sunamphitoe pelagica. Sampling was carried out seasonally between January and November 2012 in a subtropical shore from the Brazilian south-eastern coast (23 degrees 32'S, 45 degrees 10'W). The abundance of both herbivores was positively correlated with S. filipendula biomass. However, only C. filosa had a positive relationship with H. musciformis biomass during the season of lower S. filipendula abundance. Juveniles of S. pelagica were able to survive only when consuming S. filipendula. In contrast, C. filosa survived at similar rates on epiphytes and S. filipendula, but long-term feeding on epiphytes resulted in lower growth and reproduction. Both herbivores preferred to consume S. filipendula in choice assays, but only C. filosa was able to feed on epiphytes at similar rates as it did on S. filipendula in no-choice assays. These mesograzer species may differ from each other in the mechanisms determining their association with S. filipendula. For C. filosa, epiphytes should be an alternative source of food, mainly in periods of lower host availability. Thus, the role of epiphytes on mesograzer-Sargassum interaction seems to vary temporally and among herbivores. Overall, these results contrast with the general patterns about mesograzer preferences towards epiphytes reported for other systems. Therefore, the feeding preferences of mesograzers in host-epiphyte systems and, thus, their potential impact may depend on the identity of hosts and epiphytes. (C) 2016 Elsevier B.V. All rights reserved.
机译：中型放牧者可以通过选择性地在附生藻类上放牧来使寄主大型植物受益，例如海草草甸和其他寄主似乎没有附生植物可口的其他系统的文献。然而，在寄主和附生植物都是藻类且可能都可口的地方，关于中胚草的摄食偏好的预测以及因此它们控制附生生物质的潜在能力尚不清楚。同样，很少有人测试过以宿主藻类和附生植物为食的性能后果，这可以解释中生杂食动物的觅食偏好。通过研究草食两栖类拟南芥（Cymadusa filosa）和双翅目（Sunamphitoe filosa）的丰度，性能，饲喂偏好和饲喂率，来对比寄主藻Sargassum filipendula和其两个常见的附生藻（Hypnea musczformis和Dictyota cervicornis）对中型草食者的食品价值。采样是从2012年1月至2012年11月在巴西东南海岸的亚热带海岸（南纬23度32度，北纬45度10度）进行的。两种草食动物的丰度与桑氏菌生物量呈正相关。然而，在较低的纤毛链霉菌丰度季节中，仅纤毛梭菌与穆氏梭菌生物量呈正相关。远志链球菌的幼体仅在食用菲律宾金链球菌时才能存活。相反，在附生植物和菲氏链霉菌上，C。filosa的存活率相似，但是长期摄取附生植物导致生长和繁殖降低。两种草食动物在选择试验中都喜欢食用费氏链球菌，但是只有无花链球菌能够以与无选择法中费氏链球菌相同的速率摄食附生植物。这些中型放牧者物种可能在决定它们与菲律宾链霉菌的联系方面彼此不同。对于C. filosa，附生植物应作为食物的替代来源，主要是在寄主利用率较低的时期。因此，附生植物在中型草-羊栖菜相互作用中的作用似乎在时间上和食草动物之间是不同的。总体而言，这些结果与其他系统报道的中型食草动物对附生植物的偏好的一般模式形成了鲜明对比。因此，寄主植物表皮中生食草动物的觅食偏好及其潜在影响可能取决于寄主和附生植物的身份。 （C）2016 Elsevier B.V.保留所有权利。

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