Seasonal dynamics of zooplankton resource use revealed by carbon amino acid stable isotope values
Seasonal dynamics of zooplankton resource use revealed by carbon amino acid stable isotope values
复制标题
碳氨基酸稳定同位素值揭示浮游动物资源利用的季节动态
DOI：
--
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
M. Winder
中科院分区：
文献类型：
--
作者：
J. Nielsen;M. Winder
可靠的示踪技术是在动态生态系统中检索消费者膳食资源使用的准确信息的基础。对必需氨基酸中的δ C-13值的分析表明，在有效捕获消费者食物来源方面有很大的希望，因为必需氨基酸不是由异养生物合成的，而是直接从饮食来源传递给消费者，导致可以忽略的C-13营养歧视。我们评估了一个广泛的关键桡足类物种（蜱属）的季节性摄食模式。在北方波罗的海适当使用互补的方法：散装三角洲C-13和三角洲N-15值，三角洲C-13值的必需氨基酸，和定量浮游植物分类数据。我们的研究结果表明，在每周到每月的采样间隔，这表明，Acartia优先利用特定的膳食资源，包括只有部分的总浮游植物组成（变化从19.7%到81.4%的季节）测量的Acartia和悬浮物三角洲C-13必需氨基酸值之间的显着差异。研究结果还表明，应注意从散装稳定同位素消费者高度选择性时，推断营养位置，因为悬浮物的同位素值可能无法准确地反映消费者特定的饮食资源摄取。分析必需氨基酸中的Δ C-13值被证明是一种有前途的工具，可以准确地追踪复杂自然系统中消费者资源的使用。
Reliable tracer techniques are fundamental to retrieving accurate information on consumer dietary resource use in dynamic ecosystems. Analysis of delta C-13 values in essential amino acids has shown great promise in effectively capturing consumer food sources, since essential amino acids are not synthesized by heterotrophic organisms but instead routed directly from dietary sources to consumers, resulting in negligible C-13 trophic discrimination. We assessed seasonal feeding patterns of a widespread key copepod species (Acartia spp.) in the northern Baltic proper using complementary approaches: bulk delta C-13 and delta N-15 values, delta C-13 values of essential amino acids, and quantitative phytoplankton taxonomic data. Our results showed distinct differences between Acartia and seston delta C-13 essential amino acid values measured at weekly to monthly sampling intervals, which indicated that Acartia preferentially utilized specific dietary resources that comprised only parts of the total phytoplankton composition (varying from 19.7% to 81.4% during the season). Results also indicated that care should be taken when inferring trophic position from bulk stable isotopes when consumers are highly selective, since isotope values of seston may not accurately reflect consumer specific diet resource uptake. Analysis of delta C-13 values in essential amino acids was shown to be a promising tool to accurately trace consumer resource use in complex natural systems.