Seasonal and site-specific variation in the nutritional quality of temperate seaweed assemblages: implications for grazing invertebrates and the commercial exploitation of seaweeds
Seasonal and site-specific variation in the nutritional quality of temperate seaweed assemblages: implications for grazing invertebrates and the commercial exploitation of seaweeds
复制标题
DOI：
10.1007/s10811-020-02302-1
复制
发表时间：
2020-10-22
影响因子：
3.3
通讯作者：
Mundy, Craig N.
中科院分区：
文献类型：
--
作者：
Britton, Damon;Schmid, Matthias;Mundy, Craig N.
在沿海生态系统中，海藻为包括具有重要商业价值的食草动物在内的各种物种提供栖息地和食物来源。在这些系统中，海藻是最终的能量来源，海藻的任何变化都会影响到营养水平较高的物种。海藻富含多不饱和脂肪酸(PUFA)等营养重要化合物，尤其富含长链(>；=C-20)多不饱和脂肪酸(LC-PUFA)。在澳大利亚南部，大南礁拥有世界上最多样化的海藻聚集地之一，这些海藻支持着高产的渔业，被认为是一种很有前途的omega-3 LC-PUFA资源。尽管如此，关于大多数物种的生化组成以及它如何在地点和季节之间变化的信息很少。为了解决这一知识差距，我们进行了一项调查，以评估塔斯马尼亚东部三个地点丰富的林下海藻的生化成分(脂肪酸和氮含量)的季节性变化。营养化合物的可获得性因地点不同而不同，主要是由于每个地点营养红色海藻的生物量和生化成分的差异。这种差异可能解释了商业渔业生产力的区域差异。在物种水平上，脂肪酸组成的季节变化在物种和地点之间差异很大，这表明在这个系统中，多种环境驱动因素影响着海藻的脂肪酸组成。这一发现表明，塔斯马尼亚东部海藻的商业收获将需要考虑脂肪酸组成的物种和特定地点的可变性。
In coastal ecosystems, seaweeds provide habitat and a food source for a variety of species including herbivores of commercial importance. In these systems seaweeds are the ultimate source of energy with any changes in the seaweeds invariably affecting species of higher trophic levels. Seaweeds are rich sources of nutritionally important compounds such as polyunsaturated fatty acids (PUFA) and are particularly rich in long-chain (>= C-20) PUFA (LC-PUFA). In southern Australia, the 'Great Southern Reef' has one of the most diverse assemblages of seaweeds in the world, which support highly productive fisheries and have been recognised as a promising resource of omega-3 LC-PUFA. Despite this, there is little information on the biochemical composition of most species and how it varies between sites and seasons. To address this knowledge gap, we undertook a survey to assess seasonal variability in the biochemical composition (fatty acids and nitrogen content) of abundant understory seaweeds across three sites in eastern Tasmania. The availability of nutritional compounds differed between sites and was primarily driven by differences in the biomass and the biochemical composition of the nutritious red seaweeds at each site. This variability may explain regional differences in the productivity of commercial fisheries. At the species level, seasonal changes in fatty acid composition were highly variable between species and sites, indicating that multiple environmental drivers influence fatty acid composition of seaweeds in this system. This finding suggests that commercial harvest of seaweeds from eastern Tasmania will need to consider species and site-specific variability in fatty acid composition.