Recent declines of macroalgal forests due to climate change imply that the aquaculture production of macroalgae may also be negatively affected by ocean warming. It has previously been shown that nutrient enrichment can offset the negative impact of warming on the survival and growth of the cultivated macroalga Undaria pinnatifida, although it can also increase the risk of herbivory by unrecognized mesograzers. Observations of several hundreds or thousands of the isopod Cymodocea japonica around U. pinnatifida cultivation ropes in autumn, prompted the analysis of their size-frequency distribution, relationship between body size and consumption rate, and combined effects of elevated temperature and nutrient enrichment on the consumption rate of the algae by the isopod in the current study. Although the body size of the isopods collected in autumn was smaller than those collected in winter and spring, the consumption rate of 600 small isopods was similar to the rate of a large individual. Additionally, the consumption rate doubled in response to an increase in temperature from 15 to 18°C and nutrient enrichment, and tripled with their combination. These results suggest that ocean warming combined with nutrient enrichment increase the risk of herbivory during U. pinnatifida cultivation, especially during isopod outbreak periods.

中文翻译：

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海洋变暖与营养物质富集相结合，增加了在海洋大型藻类Undaria Pinnatifida的养殖过程中食草的风险

由于气候变化，近来大型藻类森林的减少表明，大型藻类的水产养殖产量也可能受到海洋变暖的不利影响。以前已经表明，营养物的丰富可以抵消变暖对栽培大藻裙带菜的生存和生长的负面影响，尽管它也可能增加未被识别的中皮草的食草风险。裙带虫周围数百种或数千种等足类Cymodocea japonica的观测结果秋季研究栽培绳索，促使人们分析其尺寸-频率分布，体型与消耗率之间的关系，以及当前研究中等足动物对高温和营养富集对藻类消耗率的综合影响。尽管秋天收集的等足类动物的体形小于冬春季和春季收集的等足类动物，但600个小等足类动物的消耗率与大个体的消耗率相似。此外，由于温度从15升高到18°C和营养物质富集，消耗率增加了一倍，而两者的组合则使消耗率增加了三倍。这些结果表明，海洋变暖与养分富集相结合，会增加美国pinnatifida期间食草的风险。 栽培，尤其是在等足动物暴发期间。