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首页> 外文期刊>Marine biology >Processing of allochthonous macrophyte subsidies by sandy beach consumers: estimates of feeding rates and impacts on food resources
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Processing of allochthonous macrophyte subsidies by sandy beach consumers: estimates of feeding rates and impacts on food resources

机译：沙滩消费者加工异种植物的补贴：估计摄食率及其对粮食资源的影响

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摘要

Allochthonous subsidies of organic material can profoundly influence population and community structure; however, the role of consumers in the processing of these inputs is less understood but may be closely linked to community and ecosystem function. Inputs of drift macro-phytes subsidize sandy beach communities and food webs in many regions. We estimated feeding rates of dominant sandy beach consumers, the talitrid amphipods (Megalor-chestia corniculata, in southern California, USA, and Tali-trus saltator, in southern Galicia, Spain), and their impacts on drift macrophyte subsidies in field and laboratory experiments. Feeding rate varied with macrophyte type and, for T. saltator, air temperature. Size-specific feeding rates of talitrid amphipods were greatest on brown macroalgae (Macrocystis, Egregia, Saccorhiza and Fucus). Rates for large individuals of both species ranged from ～40 mg wet wt individual~(-1) 12 h~(-1) on brown macroalgae to negligible feeding by M. corniculata on a vascular plant (surfgrass). Amphipod growth rates were also greatest on Macrocystis and lowest on surfgrass, Phyllospadix. For a Californian beach with substantial inputs of macrophyte wrack (>70 kg wet wt m~(-1) month~(-1) in summer), we estimated that the population of talitrid amphipods could process an average of 55% of the palatable Macrocystis input. Our results indicate that talitrid amphipod populations can have a significant impact on drift macrophyte processing and fate and that the quantity and composition of drift macrophytes could, in turn, limit populations of beach consumers.
机译：有机材料的外来补贴会深刻影响人口和社区结构；然而，消费者在处理这些投入中的作用了解得很少，但可能与社区和生态系统功能密切相关。漂移大型植物的输入补贴了许多地区的沙滩社区和食物网。我们在野外和实验室实验中估计了主要的沙滩消费者，滑石两栖纲动物（美国南部加利福尼亚的Megalor-chestia corniculata和西班牙南部加利西亚的Tali-trus盐析器）的进食速率及其对漂移大植物补贴的影响。 。饲喂速率随大型植物的类型而变化，而对于盐衣藻而言，其进风温度也不同。在棕色大型藻类（Macrocystis，Egregia，Saccorhiza和Fucus）上，talitrid脚足类动物的大小特定摄食率最大。两种物种的大个体的发生率范围从在褐色大型藻类上的〜40 mg湿重个体〜（-1）12 h〜（-1）到在血管植物（表面草）上的M. corniculata摄食可忽略不计。两栖类的生长率在Macrocystis上也最高，而在草丛Phyllospadix上最低。对于加利福尼亚州海滩上大量的大型植物残骸（夏季大于70千克湿重m〜（-1）月〜（-1）），我们估计滑坡两栖动物的种群平均可处理55％的可口鱼类巨囊藻输入。我们的结果表明，滑石两栖纲种群可能对漂流大型植物的加工和命运产生重大影响，漂流大型植物的数量和组成反过来可能会限制海滩使用者的种群。

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