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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Polar extracts of the brown alga Fucus vesiculosus (L.) reduce assimilation efficiency but do not deter the herbivorous isopod Idotea baltica (Pallas)
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Polar extracts of the brown alga Fucus vesiculosus (L.) reduce assimilation efficiency but do not deter the herbivorous isopod Idotea baltica (Pallas)

机译：褐藻海藻（Fusus vesiculosus（L.））的极性提取物可降低同化效率，但不能阻止草食的等足类Idotea baltica（Pallas）

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Plant secondary metabolites provide resistance against herbivory if they are capable of decreasing herbivore performance or deterring feeding. Here we test the effects of phlorotannin-containing polar extracts from the brown alga Fucus vesiculosus on the assimilation efficiency and feeding preferences of the herbivorous isopod Idotea baltica. We test the effects separately for each sex of the isopod to test the hypothesis that the digestive efficiencies of the sexes may have diverged. Phlorotannin-containing polar extracts were incorporated into an agar-based artificial food in varying amounts. We also varied the quality of the food, using high-quality food containing animal proteins and low-quality food containing only algal material. The total assimilation efficiency as well as the assimilation efficiencies of carbon and nitrogen decreased with an increasing concentration of phlorotannin-containing extracts. The negative effects on carbon and nitrogen assimilation were higher when extracts were incorporated in the high-quality food. Females were consistently more efficient than males in all assimilation measures; there were no interactions between sex and food quality or phlorotannin concentration, suggesting that the digestive efficiency of the sexes had diverged but that the two sexes responded similarly to phlorotannin enriched artificial food. Although phlorotannin-containing extracts were harmful to performance, they did not deter feeding in preference tests. On the contrary: the isopods preferred the food containing more phlorotannins, suggesting that phlorotannins may act as cues in host recognition. Thus phlorotannins were inefficient deterrents, and I. baltica seems to be adapted to utilizing phlorotannin-containing foods despite their detrimental effects on assimilation. We suggest that F. vesiculosus provides a predation refuge and temporal constancy in availability for I. baltica, both of which select for the ability to utilize it as a food. Phlorotannin-containing polar extracts from F. vesiculosus are still harmful digestibility reducers, and may thereby prevent complete specialization and generate selection for utilization of a wider host range.
机译：如果植物次生代谢物能够降低草食动物的生长性能或阻止进食，则它们可提供对草食动物的抗性。在这里，我们测试了来自褐藻海藻（Fusus vesiculosus）的含环草单宁的极性提取物对草食异足类波罗的海豚（Idotea baltica）的同化效率和饲喂偏好的影响。我们分别测试了等足动物各性别的影响，以检验性别消化效率可能存在差异的假设。将含次膦酸的极性提取物以不同的量掺入琼脂基人造食品中。我们还使用包含动物蛋白的高质量食物和仅包含藻类物质的低质量食物来改变食物的质量。总同化效率以及碳和氮的同化效率随着含邻苯二酚单宁提取物浓度的增加而降低。当将提取物掺入优质食品中时，对碳和氮同化的负面影响更大。在所有同化措施中，女性始终比男性更有效率；性别与食物质量或邻苯二酚单宁浓度之间没有相互作用，这表明两性的消化效率有所不同，但两种性别对富含邻苯二酚的人造食物的反应相似。尽管含邻苯二酚单宁的提取物对生产性能有害，但它们并未阻止偏好试验中的进食。相反：异足动物更喜欢含有更多的邻苯二酚单宁的食物，这表明邻苯二酚可能是宿主识别的线索。因此，phrotrotannin的威慑力低下，尽管波罗的海I. baltica对同化有不利影响，但它似乎已适应使用含phrotrotannin的食物。我们建议F. vesiculosus为I. baltica提供捕食避难所和时间稳定性，两者都选择了将其用作食物的能力。来自维氏镰刀菌的含环孢单宁的极性提取物仍是有害的消化率降低剂，因此可能会阻止其完全专业化，并可能导致选择范围更广的宿主。

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