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Effects of temperature, body size, and starvation on feeding in a major echinoderm predator

机译：温度，体型和饥饿对主要棘皮动物食肉动物摄食的影响

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The common sea star, Asterias rubens, is a major predator in rocky subtidal ecosystems in the northern Gulf of St. Lawrence and along the Atlantic coasts of Nova Scotia and Newfoundland, Canada. We carried out two laboratory experiments to test the effects of water temperature, starvation, and body size, on mussel (Mytilus edulis) consumption and size selection in A. rubens from southeastern Newfoundland. Experiment 1 examined rates of consumption of medium (15-30 mm) mussels by small (9-15 cm) sea stars fed or starved moderately (for 3 weeks) at three temperatures representative of late summer highs (8, 11, and 15 A degrees C) and one temperature representative of late winter lows (2 A degrees C). Temperature and starvation did not affect consumption in summer, which was two times higher than in winter. Starvation also did not affect consumption in winter. Experiment 2 examined consumption of small (5-15 mm), medium, and large (30-45 mm) mussels by small and large (25-30 cm) sea stars fed or starved moderately or severely (for 6 weeks). Small sea stars consumed similar proportions of mussels regardless of starvation. However, large, moderately starved sea stars consumed at least two times more mussels than large, fed and large, severely starved individuals, indicating that the need to feed after a short starvation was higher in large than small A. rubens. Consumption of small, medium, and large mussels was, respectively, affected by the sea star's size only, size and starvation independently, and size and starvation interactively. Collectively, our findings indicate that starvation, body size, and their interaction are key modulators of feeding in A. rubens, while suggesting that feeding is adaptable to thermal conditions. They also speak of the importance of considering the interplay between organismal traits and ongoing changes in ocean climate to better predict causes and consequences of alterations in predator-prey interactions.
机译：常见的海星Asterias rubens是圣劳伦斯湾北部以及加拿大新斯科舍省和纽芬兰的大西洋沿岸岩石潮汐生态系统中的主要捕食者。我们进行了两个实验室实验，以测试水温，饥饿和体型对纽芬兰东南部A. rubens贻贝（Mytilus edulis）食用和大小选择的影响。实验1检验了在代表夏末高温（8、11和15 A）的三个温度下，适度（3周）喂食或饿死的小（9-15 cm）海星消耗中等（15-30 mm）贻贝的速率摄氏度）和一个代表冬末低点（2摄氏度）的温度。夏天的温度和饥饿对消费没有影响，是冬天的两倍。饥饿也没有影响冬天的消费。实验2研究了大小适度或严重饥饿（6周）的大型和大型（25-30厘米）海星消耗的小型（5-15毫米），中型和大型（30-45毫米）贻贝。无论饥饿状况如何，小海星消耗的贻贝比例都差不多。但是，大，中度饥饿的海星消耗的贻贝至少是大，饱食和大而严重饥饿的个体的贻贝，这表明短饥饿后进食的需求比小曲霉高。小贻贝，中贻贝和大贻贝的消费分别受海星大小，大小和饥饿独立影响，大小和饥饿相互作用的影响。总的来说，我们的发现表明饥饿，体重和它们的相互作用是红曲霉摄食的关键调节剂，同时表明摄食适应于热条件。他们还谈到了考虑生物特征与海洋气候持续变化之间相互作用的重要性，以更好地预测食肉动物与猎物相互作用变化的原因和后果。

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  • 来源
    《Marine biology》 |2015年第5期|1125-1135|共11页
  • 作者

    St-Pierre Anne P.; Gagnon Patrick;

  • 作者单位

    Mem Univ Newfoundland, Dept Ocean Sci, Ctr Ocean Sci, St John, NF A1C 5S7, Canada;

    Mem Univ Newfoundland, Dept Ocean Sci, Ctr Ocean Sci, St John, NF A1C 5S7, Canada;

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