• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Estuarine Coastal and Shelf Science >Physical and biogeochemical correlates of spatio-temporal variation in the delta C-13 of marine macroalgae
【24h】

Physical and biogeochemical correlates of spatio-temporal variation in the delta C-13 of marine macroalgae

机译：海洋大型藻类三角洲C-13时空变化的物理和生物地球化学相关性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Carbon isotope ratios (C-13/C-12) can be used to trace sources of production supporting food chains, as delta C-13 undergoes relatively small and predictable increases (similar to 0.5%0) through each trophic level. However, for this technique to be precise, variation in delta C-13 signatures of different sources of production (baseline sources) must be clearly defined and distinct from each other. Despite this, delta C-13 in the primary producers of marine systems are highly variable over space and time, due to the complexity of physical and biogeochemical processes that drive delta C-13 variation at the base of these foodwebs. We measured spatial and temporal variation in the delta C-13 of two species of macroalgae that are important dietary components of grazers over temperate reefs: the small kelp Ecklonia radiata, and the red alga Plocamium preissianum, and related any variation to a suite of physical and biogeochemical variables. Patterns in delta C-13 variation, over different spatial (10 s m to 100 km) and temporal scales (weeks to seasons), differed greatly between taxa, but these were partly explained by the delta C-13 of dissolved inorganic carbon (DIC) and light. However, while the delta C-13 in Ecklonia radiata was not related to water temperature, a highly significant proportion of the spatio-temporal variation in delta C-13 of Plocamium preissianum was explained by temperature alone. Accordingly, we applied this relationship to project (across temperate Australasia) and forecast (in time, south-western Australia) patterns in Plocamium preissianum delta C-13. The mean projected delta C-13 for Plocamium preissianum in the study region varied by only similar to 1%0 over a 12-month period, compared to similar to 3%0 over 2000 km. This illustrates the potential scale in the shift of delta C-13 in baseline food sources over broad scales, and its implications to food web studies. While we show that those relationships differ across taxonomic groups, we recommend developing models to explain variability in delta C-13 of other baseline sources to facilitate the interpretation of variation in delta C-13 of consumers in food webs, particularly where data for baselines are absent over broad scales. (C) 2015 Elsevier Ltd. All rights reserved.
机译：碳同位素比（C-13 / C-12）可用于追踪支持食物链的生产来源，因为在每个营养级，C-13增量都相对较小且可预测地增加（类似于0.5％0）。但是，为了使该技术更加精确，必须明确定义不同生产来源（基准来源）的C-13签名差异，并且彼此不同。尽管如此，由于物理和生物地球化学过程的复杂性驱使这些食物网基部的δC-13变化，海洋系统主要生产国的δC-13随时间和空间变化很大。我们测量了两种大型藻类在三角洲C-13的时空变化，这两种藻类是温带礁上放牧者的重要饮食成分：小海带Ecklonia radiata和红藻Plocamium preissianum，并将任何变化与一套物理和生物地球化学变量。在不同的空间（10 sm至100 km）和时间尺度（几周至四季）的三角洲C-13变化模式，在分类单元之间差异很大，但这部分由溶解无机碳（DIC）的三角洲C-13解释。和光。然而，尽管辐射埃克洛尼亚菌的δC-13与水温无关，但是仅通过温度就可以解释Plocamium preissianumδC-13时空变化的显着比例。因此，我们将此关系应用于Plocamium preissianum delta C-13的项目（横跨温带大洋洲）和预测（及时，澳大利亚西南部）模式。在研究区域中，Ploscamium preissianum的平均预计δC-13在12个月内变化仅接近1％0，而在2000 km范围内变化接近3％0。这说明了在较大范围内基准食物来源中C-13三角洲转移的潜在规模，及其对食物网研究的影响。虽然我们表明这些关系在不同的分类组之间是不同的，但是我们建议开发模型来解释其他基准源的C-13的变异性，以便于解释食物网中消费者C-13的变异，尤其是在基准数据为广泛缺乏。 （C）2015 Elsevier Ltd.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号