溯河鳗鲡碳和氮稳定同位素比值的变化凸显了河流-河口的连续性。

IF 2.3 2区 环境科学与生态学 Q2 ECOLOGY
Oecologia Pub Date : 2024-10-01 Epub Date: 2024-09-19 DOI:10.1007/s00442-024-05618-8
Atsushi Nishimoto, Masuo Iida, Kazuki Yokouchi, Nobuto Fukuda, Toshihiro Yamamoto
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引用次数: 0

摘要

河口表现出很高的物理化学变异性,但人们尚未系统地了解河口及其组成区段的特性。本研究旨在利用理想的天然采样器之一--日本鳗鱼(Anguilla japonica)的碳和氮稳定同位素比值(分别为 δ13C 和 δ15N),揭示主要有机源的空间异质性。在日本宫古田川(我们的研究地点),通过采用河流连续概念,测试了鳗鱼 δ13C 和 δ15N 值作为主要有机源标准指数的有效性。然后,这项研究将这些指数的应用范围扩大到了河口,即宫古田河流入的哈马纳湖水系。一旦进入河口上游,鳗鱼的δ13C和δ15N值就变得很高,后者在河流-河口连续体中达到峰值,这表明δ15N值高的人工可溶性补贴(营养物质和有机物)被迅速同化到食物网中。在河口中部,鳗鱼的 δ15N 值再次下降。尽管如此,陆地有机物补贴的影响还是延伸到了这一河段,鳗鱼的 δ13C 值较低就证明了这一点。这些结果表明,δ15N 值较低的难分解有机物(如源自植物的有机物)在河口下游河段的食物网中被缓慢同化。河口下游较高的δ13C 值表明,除底栖微藻外,还有鳗草或大型藻类的参与。因此,我们的研究结果强调,需要考虑多种能量流,将河口作为一个连续体来理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
River-estuary continuum highlighted by variabilities in carbon and nitrogen stable isotope ratios of the catadromous eel Anguilla japonica.

Estuaries exhibit high physicochemical variability and the properties of estuaries and the constituent segments are not yet systematically understood. This study aims to reveal the spatial heterogeneity of predominant organic sources using carbon and nitrogen stable isotope ratios (δ13C and δ15N, respectively) of Japanese eels (Anguilla japonica), one of the ideal natural samplers. In the Miyakoda River, Japan, our study site, the effectiveness of eel δ13C and δ15N values as standard indices of predominant organic sources was tested by employing the River Continuum Concept. This study then extended the application of these indices to the estuary, i.e., the Hamana Lake system, into which the Miyakoda River flows. Once in the upper estuary, eel δ13C and δ15N values became high, with the latter peaking in this river-estuary continuum, indicating that artificial labile subsidies (nutrients and organic matter) with high δ15N values were rapidly assimilated into the food web. Eel δ15N values decreased again in the middle estuary. Nevertheless, the influence of terrestrial organic subsidies extended into this segment, as evidenced by the low δ13C values of eels. These results suggest that refractory organic matter with low δ15N values, such as plant-derived ones, is slowly assimilated into the food web in the downstream estuarine segments. The higher δ13C values in the lower estuary suggested that the contribution of eelgrass or macroalgae occurred in addition to benthic microalgae. Thus, our results emphasize the need to consider the multiple energy flows to understand the estuary as a continuum.

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来源期刊
Oecologia
Oecologia 环境科学-生态学
CiteScore
5.10
自引率
0.00%
发文量
192
审稿时长
5.3 months
期刊介绍: Oecologia publishes innovative ecological research of international interest. We seek reviews, advances in methodology, and original contributions, emphasizing the following areas: Population ecology, Plant-microbe-animal interactions, Ecosystem ecology, Community ecology, Global change ecology, Conservation ecology, Behavioral ecology and Physiological Ecology. In general, studies that are purely descriptive, mathematical, documentary, and/or natural history will not be considered.
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