Feeding preferences and host associations of specialist marine herbivores align with quantitative variation in seaweed secondary metabolites
Feeding preferences and host associations of specialist marine herbivores align with quantitative variation in seaweed secondary metabolites
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DOI：
10.3354/meps08359
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发表时间：
2009-01-01
影响因子：
2.5
通讯作者：
Paul, Nicholas A.
中科院分区：
文献类型：
--
作者：
Baumgartner, Finn A.;Motti, Cherie A.;Paul, Nicholas A.
海藻次生代谢物的同源定量变化对特殊海洋食草动物的饮食特异性和宿主关联的影响很少受到关注。研究了7种绿海藻茎花素和氧毒素1的数量变化，以及4种共生的棘舌软体动物的摄食偏好和寄主关联。紫杉树和卷叶卷叶草的代谢物含量较高，是所有食草动物最不喜欢的。毛毛Elysia tomentosa和Lobiger viridis偏爱具有中等代谢物浓度的藻类（总形藻、C、serrulata和C cupressoides）。绿氧藻（Oxynoe viridis）和smaragdinus对不同的低浓度Caulerpa物种（C. racemosa vars . laetevirens和C. lentillifera）有强烈的偏好，表明并非所有的摄食偏好都完全基于主要代谢物。绿乳杆菌和黄乳杆菌的原位寄主关联反映了它们的取食偏好，但绒毛乳杆菌的情况并非如此。代谢物浓度最高和最低的藻种，其囊藻总密度最低。结果表明，鸡冠藻化学定量变化的直接影响可能只局限于某些舌聚糖的寄主关联。然而，来自多种具有独特偏好的食草动物的摄食压力仍然可能导致同属藻类之间化学防御的变化。
Consequences of congeneric quantitative variation in secondary metabolites of seaweeds on diet specificity and host association in specialist marine herbivores have received little attention. We investigated quantitative variation in caulerpenyne and oxytoxin 1 in 7 species of green seaweeds from the genus Caulerpa, along with the feeding preferences and host associations of 4 co-occurring sacoglossan molluscs. C. taxifolia and C. sertularioides contained high concentrations of metabolites and were preferred least by all herbivores. Algae with intermediate metabolite concentrations (C. racemosa, C, serrulata, and C. cupressoides) were preferred by Elysia tomentosa and Lobiger viridis. Oxynoe viridis and Stiliger smaragdinus had strong preferences for different low concentration Caulerpa species (C. racemosa var. laetevirens and C. lentillifera), suggesting not all feeding preferences are based exclusively on the major metabolites. In situ host associations of L. viridis and S. smaragdinus mirrored their feeding preferences, but this was not the case for E. tomentosa. Furthermore, those algal species with the highest and lowest metabolite concentrations had the lowest overall densities of sacoglossans. The results imply that the direct influence of quantitative variation in Caulerpa chemistry may only be limited to host associations in some sacoglossans. However, feeding pressure from multiple herbivore species with unique preferences could still contribute to variation in chemical defence amongst congeneric algae.