• 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 >Effects of terrestrial input on macrobenthic food webs of coastal sea are detected by stable isotope analysis in Gaeta Gulf
【24h】

Effects of terrestrial input on macrobenthic food webs of coastal sea are detected by stable isotope analysis in Gaeta Gulf

机译：通过稳定的同位素分析在加埃塔湾检测到陆地输入对沿海大型底栖食物网的影响

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

Stable isotope analysis (SIA) of carbon (delta C-13) and nitrogen (delta N-15) was used to analyse the macrobenthic food web dynamics in the Gulf of Gaeta (Tyrrhenian sea, Central Italy) under the influence of discharge from the river Garigliano. Specimens of macrobenthic invertebrates and organic matter (Phytoplankton, detritus and Sediment Organic Matter, SOM) were sampled in eight subtidal sampling sites in the Gulf and subjected to SIA. Bayesian Stable Isotope Mixing Models were used to quantify the proportional contribution of each basal resource to macrobenthic primary consumer diets. The food web topology of each sampling site was also reconstructed and the key food web metrics (connectance, linkage density, mean chain length) were calculated in order to detect potential effects of the river plume at all trophic levels. The delta C-13 signatures of basal resources indicated that bulk organic matter in the Gulf has two main inputs: a) autochthonous, derived from marine primary producers (phytoplankton, seagrass detritus), predominant in the northern part of the Gulf, far from the river mouth, and b) allochthonus, derived from inputs of terrigenous detritus, predominant in the southern part, near the mouth of the river Garigliano. A spatial transition was observed in the main component of primary consumer diets, from phytoplankton (north-western sampling sites) to allochthonous detritus (south-eastern sampling sites), with important influences on the structure of the food webs. Approaching the river mouth we also observed a simplification of network topology in terms of a decrease in the number of species, linkage density and mean food web chain length. Our study provides insight into coastal benthic food web and ecosystem functioning as influenced by river mouths, with particular emphasis on the linkages between pelagic-benthic and terrestrial systems, even on the local scale. (C) 2015 Elsevier Ltd. All rights reserved.
机译：碳（δC-13）和氮（δN-15）的稳定同位素分析（SIA）用于分析加埃塔湾（意大利中部第勒尼安海）受排放影响下的大型底栖食物网动力学。加里利亚诺河。在海湾的八个潮下采样点取样了大型底栖无脊椎动物和有机物（浮游植物，碎屑和沉积物有机质，SOM）的标本，并进行了SIA。贝叶斯稳定同位素混合模型被用来量化每种基础资源对大型底栖主要消费者饮食的比例贡献。还重建了每个采样点的食物网拓扑，并计算了关键的食物网指标（连通性，连接密度，平均链长），以检测所有营养级河羽的潜在影响。基础资源的C-13三角洲特征表明，海湾地区的大量有机物有两个主要输入：a）原生于海洋的主要生产者（浮游植物，海草碎屑），主要分布在海湾北部，远离海湾。 b）异源地，来源于陆生碎屑的输入，主要来自南部，靠近加里格里亚诺河口。在初级消费饮食的主要组成部分中观察到了空间过渡，从浮游植物（西北采样点）到异源碎屑（东南采样点），这对食物网的结构产生了重要影响。靠近河口，我们还观察到网络拓扑的简化，包括物种数量，链接密度和平均食物网链长度的减少。我们的研究提供了受河口影响的沿海底栖食物网和生态系统功能的见解，尤其着重于上层-底栖和陆地系统之间的联系，甚至在本地范围内。 （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