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Does temperature constrain diet choice in a marine herbivorous fish?

机译：温度约束饮食在海洋食子鱼中的选择吗？

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摘要

The temperature constraint hypothesis (TCH) states that low water temperatures constrain the efficiency of algal digestion in fishes to an extent that limits the viability of herbivory. It is a widely cited explanation for the decline in diversity and abundance of marine herbivorous fishes at high latitudes. A key prediction of this hypothesis is that temperature-related physiological constraints may be ameliorated in free-living herbivores by a shift from herbivory to omnivory. We investigated this prediction by examining the diet of the primarily herbivorous marine fish Odax pullus (Labridae) at multiple locations spanning a gradient of 10 degrees latitude and encompassing a change in median annual sea surface temperature of 5-7 degrees C. Foregut content and stable isotope analyses were used to compare diet across locations and results were evaluated against the prediction that a latitudinal temperature constraint on herbivory would result in significant variation in the composition of adult diets or the timing of an ontogenetic switch from omnivory to herbivory at colder, higher latitudes. We found that neither the proportion of animal material consumed nor ontogenetic changes in diet varied across the distributional range of this species in a manner consistent with the predictions of the TCH. This study demonstrates that water temperature does not constrain herbivory in a marine ectothermic herbivore and thus challenges a widely cited hypothesis.
机译：温度约束假设（TCH）指出低水温限制鱼类中的藻类消化效率，以限制草食病的生存率。它是一个广泛引用的解释高纬度地区海洋食草鱼类的多样性和丰富。这种假设的关键预测是，通过从草食病的转变为鞣法，可以在自由生活草本植物中改善与温度相关的生理约束。我们通过在跨越10度纬度的梯度的多个位置检查主要食草海洋鱼类犬酱（Labridae）的饮食来调查这一预测，并包含5-7摄氏度的中位数表面温度的变化。前提含量和稳定同位素分析用于将饮食进行比较地区，并评估预测的预测，即食草症的潜在温度限制会导致成人饮食组成的显着变化或从较冷的莫文菊到草食病中的Ontogency切换的时间变化。我们发现，在与TCH预测一致的方式，饮食中的动物材料的比例也不在这种物种的分布范围内变化。本研究表明，水温不会在海洋卵巢草食虫中约束草食性，从而挑战广泛引用的假设。

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  • 来源
    《Marine biology》 |2020年第7期|99.1-99.12|共12页
  • 作者

    Johnson Jethro S.; Raubenheimer David; Bury Sarah J.; Clements Kendall D.;

  • 作者单位

    Univ Auckland Sch Biol Sci Private Bag 92019 Auckland New Zealand|Kennedy Inst Rheumatol Oxford Ctr Microbiome Studies Roosevelt Dr Oxford OX3 7FY England;

    Univ Sydney Charles Perkins Ctr Sch Life & Environm Sci Johns Hopkins Dr Sydney NSW Australia;

    Natl Inst Water & Atmospher Res Ltd NIWA 301 Evans Bay Parade POB 14-901 Wellington New Zealand;

    Univ Auckland Sch Biol Sci Private Bag 92019 Auckland New Zealand;

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