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首页> 外文期刊>Marine ecology progress series >Quantitative estimates of isopod resource utilization using a Bayesian fatty acid mixing model
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Quantitative estimates of isopod resource utilization using a Bayesian fatty acid mixing model

机译：使用贝叶斯脂肪酸混合模型对等足动物资源利用的定量估计

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摘要

Herbivorous primary consumers are a key intermediate trophic linkage between primary production from microalgae, macrophytes, and vascular plants and higher-level consumers. Fatty acid (FA) biomarkers are useful for evaluating trophic interactions in aquatic ecosystems because of clear phylogenetic separation of algal group FA signatures. We used a FA-based Bayesian mixing model (FASTAR) to generate quantitative diet estimates of 3 algal phyla for an intertidal herbivorous isopod, Idotea wosnesenskii, at 6 sites in Puget Sound, Washington, USA. We generated a 'resource library' of FA signatures of isopods fed diverse algal diets in 10-wk feeding trials and used these empirical data to parameterize FASTAR, thus accounting for isopod modification of dietary FA. The FA profiles of fast-growing juvenile Idotea were closely related to the signatures of their diets, and several polyunsaturated FA (PUFA) were highly correlated between diet and consumer (e.g. ∑C_(18)ω6 + C_(18)ω3, 20:4ω6, and 20:5ω3). We used the model to characterize individual isopod diet variability within sites and to test whether isopods utilize specific algal phyla preferentially or in similar proportions to algae available in the field. The results identified both variation in resource utilization among individual isopods within certain sites, and site level similarities with total available algal cover. Body mass index of wild isopods was highest at sites where the model indicated high utilization (e.g. ＞30%) of both green and brown algae and low support from red algae. This novel FA-based mixing model approach demonstrated the potential for quantitative diet estimations of fast-growing aquatic herbivorous consumers.
机译：食草性初级消费者是微藻，大型植物和维管植物初级生产与高级消费者之间的关键中间营养纽带。脂肪酸（FA）生物标记物可用于评估水生生态系统中的营养相互作用，因为藻类FA标记的系统发育清晰。我们使用基于FA的贝叶斯混合模型（FASTAR）在美国华盛顿州普吉特海湾的6个地点生成了潮间草食草异足类动物Idotea wosnesenskii的3种藻门的定量饮食估计。在10周的喂养试验中，我们生成了以多种藻类饮食喂养的异足动物FA签名的“资源库”，并使用这些经验数据对FASTAR进行参数化，从而说明了饮食FA的异足动物修饰。快速生长的幼虾Idotea的FA分布与其饮食特征密切相关，并且饮食和消费者之间几种多不饱和脂肪酸（PUFA）高度相关（例如∑C_（18）ω6+ C_（18）ω3，20： 4ω6和20：5ω3）。我们使用该模型表征站点内各个等足动物的饮食变异性，并测试等足动物是否优先利用特定藻类或以与现场可利用藻类相似的比例利用特定藻类。结果确定了某些站点内各个等足动物之间资源利用的变化，以及站点级别与可用藻类总覆盖量的相似性。在模型表明绿藻和褐藻的利用率都很高（例如> 30％）而红藻的支持率较低的地方，野生等足动物的体重指数最高。这种新颖的基于脂肪酸的混合模型方法证明了快速增长的水生草食消费者定量饮食估计的潜力。

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