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Use of near-infrared reflectance spectroscopy to quantify diet mixing in a generalist marine herbivore

机译:使用近红外反射光谱法来量化多面手食草动物中的饮食混合

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摘要

The diet of individual animals in the field is governed by behavioural preference as well as factors intrinsic and extrinsic to the organism that may constrain their ability to obtain preferred foods. Accurate measurements of individual diets are essential to understanding how consumers can impact communities, but can be difficult to obtain. We aim to determine whether near-infrared reflectance spectroscopy (NIRS) can be used to quantify the degree of diet mixing in the diet of a generalist herbivore, the marine gastropod Lunella torquatus. NIRS successfully classified five algal diets and could quantify the proportions of these species in two-species combinations. We then assessed whether NIRS could predict dietary composition post-digestion by contrasting faecal material from single-species and mixed diets. Partial least squares methods were used to develop prediction models that effectively discriminated among species and, for most species, effectively predicted the proportion of a given species in all possible two-species mixtures. NIRS thus has the potential to provide a non-invasive method for assessing the realised diets of free-living herbivores.
机译:该领域中个体动物的饮食受行为偏好以及有机体固有和外在因素的控制,这些因素可能会限制它们获得首选食物的能力。对个体饮食的准确测量对于了解消费者如何影响社区至关重要,但很难获得。我们的目标是确定是否可以使用近红外反射光谱(NIRS)来量化全能草食动物(即腹足类腹足动物Lunella torquatus)的饮食中的饮食混合程度。 NIRS成功地对五种藻类饮食进行了分类,并且可以量化两种物种组合中这些物种的比例。然后,我们通过对比单种和混合饮食的粪便来评估NIRS是否可以预测消化后的饮食组成。使用偏最小二乘方法来开发预测模型,该模型可以有效地区分物种,并且对于大多数物种,可以有效地预测给定物种在所有可能的两种物种混合物中的比例。因此,NIRS有潜力提供一种非侵入性方法来评估已实现的自由食草动物的饮食。

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  • 来源
    《Marine biology》 |2016年第4期|79.1-79.17|共17页
  • 作者单位

    Univ New S Wales, Sch Biol & Earth & Environm Sci, Evolut & Ecol Res Ctr, Sydney, NSW 2052, Australia;

    Univ New S Wales, Sch Biol & Earth & Environm Sci, Evolut & Ecol Res Ctr, Sydney, NSW 2052, Australia;

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