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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Within-thallus variation in chemical and physical defences in two species of ecologically dominant brown macroalgae from the Antarctic Peninsula
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Within-thallus variation in chemical and physical defences in two species of ecologically dominant brown macroalgae from the Antarctic Peninsula

机译：南极半岛两种生态优势的棕色大型藻类的触角内化学和物理防御力变化

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摘要

Macroalgae along the Antarctic Peninsula are generally unpalatable to sympatric herbivores. This is particularly true of the large, brown macroalgae that dominate the communities in terms of cover and biomass. Variation within and between individuals of the ecologically dominant genus Desmarestia has also been detected. In the present study, we examined within thallus variation of both chemical (palatability) and physical (toughness) defences in Desmarestia anceps and Desmarestia menziesii. Each species was divided into the holdfast, the primary stem, and the lateral branches, with tissue fitness values assigned to each component. Lipophilic and hydrophilic extracts were obtained from each thallus component and incorporated into artificial alginate foods. A series of bioassays tested the palatability of these foods to the sympatric, herbivorous amphipod Gondogeneia antarctica. Toughness measurements were also performed on each thallus component. Results from D. anceps, a highly differentiated species, were consistent with the Optimal Defence Theory (ODT) in that the most valuable tissue component (the primary stem) was the most strongly chemically and physically defended. The holdfast, also with a high tissue fitness value, was strongly physically defended. Laterals, which are replaceable and assigned a lower fitness value, were moderately chemically defended. No significant differences were detected in the palatability of the differing thallus parts in D. menziesii, although the holdfast and primary stem were tougher than the lateral branches. These results remain consistent with the ODT as D. menziesii displays less differentiation between the primary stem and the lateral branches and were assigned a similar fitness value.
机译：沿南极半岛的大型藻类通常对同伴食草动物不受欢迎。在覆盖和生物量方面占主导地位的大型棕色大型藻类尤其如此。还已经检测到生态优势属Desmarestia的个体内部和个体之间的差异。在本研究中，我们研究了德氏疟原虫和门氏Desmarestia menziesii的化学（适口性）防御能力和物理（韧性）防御力的变化。将每种物种分为固定，主要茎和侧枝，并为每个成分分配组织适应度值。从每个牛all成分获得亲脂性和亲水性提取物，并将其掺入人工藻酸盐食品中。一系列的生物测定法测试了这些食品对南极洲食草性两栖类双足纲食虫的适口性。还对每个触角组件进行了韧性测量。 D. anceps是高度分化的物种，其结果与最佳防御理论（ODT）一致，因为最有价值的组织成分（主要茎）在化学和物理上受到最强烈的防御。保持力，也具有很高的组织适应性值，在身体上得到了强有力的保护。可以替换的侧边具有较低的适用性，在化学上有一定程度的保护作用。尽管坚挺和初级茎比侧枝坚韧，但在孟席斯木茎中不同th体部分的适口性方面未检测到显着差异。这些结果与ODT保持一致，因为D. menziesii在主茎和侧枝之间显示出较少的分化，并被赋予了相似的适用性值。

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