Ocean acidification induces changes in algal palatability and herbivore feeding behavior and performance
Ocean acidification induces changes in algal palatability and herbivore feeding behavior and performance
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DOI：
10.1007/s00442-015-3459-3
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发表时间：
2016-02-01
期刊：
影响因子：
2.7
通讯作者：
Quijon, Pedro
中科院分区：
文献类型：
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作者：
Duarte, Cristian;Lopez, Jorge;Quijon, Pedro
全球压力对一个物种的影响可能是通过压力对共存类群的影响来介导的。例如，食草动物与藻类的相互作用可能会因海洋酸化（OA）导致的高CO2水平导致藻类营养质量的改变而发生变化。我们接近这个问题，通过评估的间接影响OA之间的营养相互作用的片足类动物Bastostoidea tuberculata和棕色durvillaea anarctica，两个突出的物种的东南太平洋沿岸。我们预测，片足类动物的摄食行为和性能（生长速度）将受到影响的藻类暴露于高水平（1000 ppm）的CO2的适口性的变化。我们暴露藻类目前和预测（OA）的大气CO2水平，然后测量其营养质量和片足类动物的偏好选择试验。我们还分别评估了无选择试验中的消耗率，并测量了片足类动物的吸收效率和生长率。在酸化条件下，藻类的蛋白质和有机质含量下降，端足类动物对这些藻类的偏好性较低。然而，在无选择试验中，我们记录了较高的放牧率藻类暴露于OA。虽然片足类的吸收效率较低，这些藻类，生长速度没有不同的治疗，这表明发生补偿性摄食。我们的研究结果表明，藻类营养价值的变化，响应OA诱导藻类适口性的变化，这些反过来影响消费者的食物偏好和性能。像OA这样的全球压力源的间接影响可能与文献中预测的直接影响一样重要或更重要。
The effects of global stressors on a species may be mediated by the stressors' impact on coexisting taxa. For instance, herbivore-algae interactions may change due to alterations in algal nutritional quality resulting from high CO2 levels associated with ocean acidification (OA). We approached this issue by assessing the indirect effects of OA on the trophic interactions between the amphipod Orchestoidea tuberculata and the brown alga Durvillaea antarctica, two prominent species of the South-east Pacific coast. We predicted that amphipod feeding behavior and performance (growth rate) will be affected by changes in the palatability of the algae exposed to high levels (1000 ppm) of CO2. We exposed algae to current and predicted (OA) atmospheric CO2 levels and then measured their nutritive quality and amphipod preference in choice trials. We also assessed consumption rates separately in no-choice trials, and measured amphipod absorption efficiency and growth rates. Protein and organic contents of the algae decreased in acidified conditions and amphipods showed low preference for these algae. However, in the no-choice trials we recorded higher grazing rates on algae exposed to OA. Although amphipod absorption efficiency was lower on these algae, growth rates did not differ between treatments, which suggests the occurrence of compensatory feeding. Our results suggest that changes in algal nutritional value in response to OA induce changes in algal palatability and these in turn affect consumers' food preference and performance. Indirect effects of global stressors like OA can be equally or more important than the direct effects predicted in the literature.