Marine Escura, Apostolos‐Manuel Koussoroplis, Christian Desvilettes
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引用次数: 0
摘要
在温带低阶溪流和河流中,大型无脊椎动物群落在物质和能量流动中起着关键作用。尽管相对稀少,但溪流中的初级生产者作为长链多不饱和脂肪酸(LC-PUFAs)的主要来源,对大型无脊椎动物具有高度的功能重要性,而长链多不饱和脂肪酸是大型无脊椎动物健康所必需的生化化合物。在这些初级生产者中,微藻在附生生物膜中的营养作用在过去几十年中得到了广泛研究,而大型藻类(红藻纲、赭藻纲)则被忽视甚至被忽略。我们呼吁今后对溪流中大型藻类的种类和产量、生化组成以及它们对溪流无脊椎动物的营养价值进行量化研究,以评估它们在溪流食物网中的潜在营养作用。我们的文献综述表明,淡水溪流中的大型藻类在季节性和局部地区都很丰富,它们经常出现在许多大型无脊椎动物类群的内脏中。从生化角度来看,所研究的大型藻类物种富含 LC-PUFA,尤其是花生四烯酸(ARA)(一种欧米伽-6 脂肪酸),与之形成鲜明对比的是,附生生物膜富含欧米伽-3 系列,尤其是二十碳五烯酸(EPA)。将红藻纲和赭藻纲大型藻类作为一种互补资源食用,可使溪流无脊椎动物优化膳食中 EPA 与 ARA 的比例。
Red and brown macroalgae in temperate stream food webs: Are we missing an important trophic link?
In temperate low‐order streams and rivers, the macroinvertebrate community has a key role in the flow of matter and energy. Despite its relative scarcity, in‐stream primary producers have a high functional importance for the macroinvertebrates as the main source of Long‐Chained PolyUnsaturated Fatty Acids (LC‐PUFAs), essential biochemical compounds for macroinvertebrates fitness. Among these primary producers, the trophic role of microalgae in periphytic biofilms has been largely studied over the last decades, while macroalgae (Rhodophyta, Ochrophyta) have been neglected or even ignored. We call for future studies quantifying macroalgal species and production in streams, their biochemical composition, as well as their nutritional value for stream invertebrates to assess their potential trophic role in stream food webs. Our literature review indicates that macroalgae can be seasonally and locally abundant in freshwater streams and that they are frequently found in the guts of numerous macroinvertebrate taxa. From a biochemical perspective, the macroalgal species studied are rich in LC‐PUFAs, particularly in Arachidonic Acid (ARA), an omega‐6 fatty acid, contrasting with periphytic biofilms, which are rich in the omega‐3 series, especially Eicosapentaenoic Acid (EPA). Consuming Rhodophyta and Ochrophyta macroalgae as a complementary resource could enable stream invertebrates to optimize their dietary EPA : ARA ratio.
期刊介绍:
Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.